Big Blog From Prague

OK, a lot to report so I will get right on it and save the dribble for last for those still reading…..

This trip to Tech Pro Aviation in Olomouc, Czech Republic, was maybe trip 4 in the last 1-1/2 years or so. I should not have to go over there so often but if you want things to get done….  But to be fair, the Czechs get a lot done if they know what to do. And the Vtwin project was a moving target with all the R&D we needed to finish. And to be clear: I might have underestimated the amount of engineering required to make the Vtwin happen.

I have been told numerous times at airshows “What a great idea! Why hasn’t anyone done this before?” I know why. Its snot easy. It is basically impossible to buy Vtwins factory-direct and built to your specs from a company making thousands of engines each month. Our Chinese connects made that happen. And that was just the start. We needed custom reduction drives designed and manufactured. Then we designed the cooling system and had that custom fabricated. Then the fuel system which went through a dozen revision. Plus, we have the custom wiring harness designed and will be wired up to our specs with all perfect lengths and connectors. Wiring the engine can be done now in minutes. And then there is the Deluxe panel. We are now designing an avionics tray to mount all the remote components behind the hinged panel. And another custom wiring harness needs fabrication. Plus we designed two custom circuit boars to control the entire avionics and greatly simply the wiring. Even I can wire up an aircraft now. Kind of. And, of course, the panel itself which is now done and getting laser cut, electroplated, then laser-labeled. Send me your N numbers!

And the cowl, radiator, exhaust, and engine mount all have to fit perfectly. We found a frustrating 5cm difference in the engine mount position from one CAD system to another which had to be sorted. It seems like endless work. And for those waiting so long for these components a frustrating wait to have a finished airframe with nothing to install.

I plan to deliver as many of these component in person to those I can drive to. And take some time with each builder to get them sorted and jump-start their building.

I keep saying it will be worth the wait and I know it to be true. The Merlin Vtwin will set a new standard for sophistication and modern engineering in a LSA-class aircraft.

Here are some finished Vtwin cowls shipping soon already painting to match customer Merlins!

Here is proof that Martin and I actually do some work! And a photo of the latest BRS installation with new shroud covers.

3 Merlins are ready to ship. We have had some cancellations so orders were shuffled. Merlin #4 is in the paint shop now. When done we can ship. ETA to Alabama is October sometime. Side note: It is sad for me to have a customer cancel due to health reasons. If only I could have delivered sooner they would have realized their dream. And it was good not to take huge deposits so I can manage the refund.

Some Merlin discussion points:

  • Inflation is too often simply an excuse to raise prices, I am not on that wagon. How much more should we charge if the price of aluminum doubles? Say it jumps from $5/lb. to $10/lb. Sounds like a lot huh? There is only about 200 lbs. of aluminum in a Merlin so that would add $1k to the cost. Aluminum is now costing more because it is directly related to the cost of electricity which has really gone up. But it won’t double the cost of the aircraft. We will raise some prices but that is mostly due to added value like on the panel electronic and wiring.
  • We will move Merlin assembly to the USA and will have higher labor costs. But we think that cost will be offset by lower freight costs.
  • Electronic components are a real issue. We have to design our circuit boards around available components. MGL has to do the same. There are incredibly long lead times for electric chit. We do order the panel components as soon as an order arrives so this lead time is minimized somewhat. See? It is not just us late.
  • We have plenty of engines and reductions drives. I will feel like Santa finally delivering these presents. Hope my sleigh is big enough! I didn’t think about that until now.

The Merlin Lite is really looking good! New cowl is finished. Floats are finished. Next week Merlin Lite #1 goes to the airport for final assembly and test flights. I am not going to make any more excuses. It has taken about triple the time I expected. It is what it is. Who wants me to take short cuts? Here are your Merlin Lite bullets:

  • The panel is great. EFIS, Trim control and indicator. Two fuel tanks (only one is allowed for Part 103 to stay under the 5 gallon limit), EMS for the engine monitoring, and the Polini dual ignition engine control. Huge space for your phone or iPad for navigating those long cross county flights.
  • We will soon conduct a fully-compliant to the Czech/German UL-2 standard flight tests. And we will physically test the key components such as the wing. So we won’t be shipping these Merlins to USA just yet. Let’s get it done right.
  • We will build and bench-test a couple of electric power designs we have been working on. We can easily retrofit the electric power on to a Polini-powered Merlin Lite. I am really looking forward to flying the first viable electric-powered ultralight floatplane that doubles as a self-launching glider.
  • Speaking of floats, they are looking great! They might even be big enough for the Merlin. But really, the Merlin Lite is ideal for floats with the slower speed, bigger wing, and huge flaps. The installation with streamlined tubes is done. We even have a unique water rudder control using push-pull Teleflex cable and a way-to-sophisticated water rudder retract lever.
  • These 750 floats are suitable for a lot of ultralights. We will start building them in USA later this year.

And here is my back yard airport. If you look closely (And not at my wife and daughter), you can see the waterski course which doubles as our seaplane runway. And the windsock is already in position and operating.

Still reading? The dribble starts now. Today my son flys to Prague and will attend the Czech Technical University CVUT to study electrical/computer engineering. This university is one of the best in Europe. I suppose they accepted him for their hockey team and not his stellar grades. But he is smarter than the average bear so should do OK.

My wife will fly here also to help get him sorted into the dorm and Czech life. Should not be too hard as he was born in Prague and Czech was his native language half his life. I would like to stay too but have to fly back to USA for the Midwest Expo starting next Thursday. I will miss his hockey try-out. Sigh. But also really need to get back to work in Dayton too.

Finally I have  a day off and can spend it writing a blog. Or moving on to Plan B!


Updates before OSHKOSH

In no particular order:

This is how the fuel and cooling plumbing will look. Blue is cooling. Green is high pressure fuel. Red is low pressure fuel return line. All these hoses are custom molded to our 3D shapes and dimensions. Super easy to install. No other fittings besides a handful of clamps. This makes for a clean, effective, light, and simple fuel/cooling system. Not to mention it looks great!

Here are some photos of how these silicone hoses are made. The tape is actually shrink wrap. A steel mandrel of our CAD-generated shape was fabricated then inserted into the silicone then wrapped in the heat shrink and baked. After the baking process the heat shrink and mandrel are removed and we have perfect fitting hoses.

Here is a video just posted by our friend Brain from Columbus. He is waiting on his Merlin kit and close enough to come visit us on occasion in Dayton. And pretty good at making videos. Maybe I can bribe him into making one from Oshkosh.

Speaking of Oshkosh, we will be in our usual space just north of Building C in the main display area. We have only one Merlin and don’t have any Merlin Lites to show but we will have plenty of updates on the finished Merlin Lites that didn’t arrive on time. And we will show 3 tents full of our innovations and technology. DEPOD, RAES, HYBRID, Hyper-STOL, Amphibs, to name a few. Plus, the Vtwin with all this nice plumbing should make the stand.

For those future Merlin owners, we will likely have a small price increase AFTER Oshkosh. This has little to do with inflation but a lot to do with all the technology we keep adding to this build. For those builders waiting so long to get the parts they need to finish their Merlin’s it won’t be much longer as plenty of parts are coming in soon. Thanks for your patience and I trust it will be worth your wait.

Builder Don has finished the right-side circuit board. Panel status:

  • Left-side circuit board Revision 1 has been ordered and should arrive in time to show at Oshkosh. This is the production version so plenty of boards are ordered.
  • Right-side boards are recently ordered and will likely arrive shortly after the show.
  • The final dimensions are now known so we can have panels laser-cut. We will bring the first panels and bring them to the show also. One will be anodized and laser-engraved and have the EFIS and maybe the left-side panel installed.

Here is Don’s description of the new ‘fuel-control’ right-side panel:

The holes for the switches and LEDs are on mechanical layer 2. There are five mounting holes but those are not part of mechanical layer 2. The tank-select switch is three-position: Left, Auto, Right.

The AUTO MODE SELECT switch to the right of the tank-select switch allows for automatic tank selection based on “TIME” or “BALANCE”.  With the Tank-Select switch set to “AUTO” and with the mode select set to “TIME”, the tanks will switch automatically every 10 minutes (or whatever interval we decide to program into the microprocessor).  When “BALANCE” is selected, then an (as yet to be determined) balance will be maintained automatically between the tanks.

Setting the tank-select switch to either “LEFT” or “RIGHT” will always disable automatic tank selection.

The four green LEDs are (from left-to-right), Pump 1 ON, Pump 2 ON, LEFT TANK, RIGHT TANK

The two red LEDs illuminate whenever either pump is turned on and the respective fuse has failed.

Alright so what does this mean?

  1. With a fuel-injected engine one pump must always be on. We install 2 pumps for redundancy. The pilot can choose to run either pump. Or both for take-off and landing if desired. Just make sure one green LED is lighted.
  2. The electronic fuel selector has a horizontally mounted switch. Simply choose left tank or right tank. Switch tanks whenever you like. When flying cross country, I usually will fly 1-1/2 hours on one tank then finish the flight on the other tank. Then I know how much fuel I burned and how much remains. Good to know if you don’t trust your fuel gauges.
  3. But wait, there is a middle position? Yes. This you might find in your friends’ Gulfstream. If you choose the middle position, then the fuel tank selector will automatically change from left tank to right tank based on a time interval or a fuel level interval.
  4. The toggle on the right side gives you the choice to have the tanks balanced automatically by time or by fuel level. You choose. We will have to decide what those intervals are and will program the microprocessor to follow those intervals.

Note: The Merlin is not out of balance with one fuel and one empty tank. The tanks are close enough to the center not to make much difference. Having this automatic fuel balancing option is a convenience and also a safety feature. Not everyone remembers to switch tanks on time.

See you at the show!


Alabama Build Center on-Line!

Ok so which is hotter? Ohio, Florida or Alabama? 3 pizza ovens come to mind. 10-hour workdays in this heat are truly exhausting. But the builds must go on. Here are your news flashes:

Work continues in Ohio on the Vtwin installation. Now the fuel system us getting fine-tuned. Green hoses are high-pressure and red hoses are the return lines. We are just getting the proper pressure regulator sorted. We will display this installation you see above at Oshkosh. I think it is exceptional and worth a look.  So much of aviation is still stuck in the past.

I have two main objectives for this first work trip to M2. Wait, we need a name for this new build center. I am open for suggestions. Pizza oven is already taken.

  1. Build a proper Vtwin FF pkg inventory. This was accomplished. Now we have a section for the redrive BOM, and the entire FF PKG BOM sorted by sections.

2 shelves cover the FF PKG BOM. One shelf is for extra hardware and supplies. 4th shelf is for queuing up components for the customer builds. Each build gets a dedicated shelf. And we have a lot of inventory. Overflowing with reduction drives and radiator kits. Plus 3 builds have all the avionics stacked up. Plenty of strobes too. We are mitigating the supply chain shortage by ordering everything as soon as an order is confirmed so we are good with most everything. Except we could use a lot more airframes……

2. We do have a build in progress. And it is going very well. As we complete all our technology and protocols, we expect these builds to go very quickly, and it is showing already. In only 2 days we:

  • Installed the engine and mounted the reduction drive and some accessories.
  • Installed the wings and tail.
  • Got a good start on the BRS installation and loaded the rocket fuel.

Yes, there remains a long list of work to do but it is not complicated, and we will get er done. But tomorrow I need to return to Florida to get out of the heat. I will leave many tasks in Paul’s capable hands while I go prepare for Oshkosh.




News from around the World

Last week the Merlin Vtwin in our Dayton workshop was nearly finished. The top cowl needed a bigger bubble and will be out of the composites and paint shop by the end of next week. So, I flew back to Florida to take an entire day off (yeah right, means I am answering e-mails, packing the trailer for Oshkosh, and writing blogs). I hope to play some ice hockey, then water ski, then BBQ tomorrow. Monday, I drive 8 hours to spend the week with Paul at our new build center near Mobile, AL. We have a couple of Vtwin Merlin builds to get going on.

So here is what I have to show for our hard work last week:

You have to look closely. These are not last week’s photos. Cooling system is 100% done and filled. Oil is filled. Fuel system is also done. Panel is operating. Wing tip navs and strobes are working. This Merlin is basically finished. Next trip we plan to have the FAA visit for the airworthiness inspection and certificate issue. Still need to program the EFIS and do the final cowl fit and set the prop pitch. Not so much work left!

We have mapped the fuel and new coolant hoses on CAD for our supplier. We will have new custom fitted and even colored hoses in stock by Oshkosh! Our FF PKG keeps getting better and better!

BREAKING NEWS: The Vtwin Merlin weighs about the same as a Rotax 582 Merlin!!!!


This is big news. This means the Vtwin can replace any 582 installations without a major weight issue!

We projected the weight to be a bit more than the 582 and less than the HKS. We are a lot closer, if even lighter, than the 582 installations. Note that this Merlin has the deluxe panel with big EFIS, transceiver, transponder, 4 antennas, and nav/strobes. But the cowl was not installed at the time of the weighing so add 4-5 lbs. We are pretty close on the balance as well. Looks like we will have to move the battery to the rear shelf and the numbers will fall into place nicely.

Builder Don has made some fine-tuning on the left side circuit board and sent the drawing off to the circuit board printer with an order for 50 copies. We should have those boards back by Oshkosh too.

BREAKING NEWS #2: Another Aeromarine Vtwin is flying!

Replica P-40 by builder Gord has now flown 1-1/2 hours with our Vtwin!!!! He only needed to upgrade the isolation rubbers to a firmer size to handle all the torque better. Nice.

I know, everyone wants to know 1) If they will get the upgraded parts and technology, and 2) When!?

The photo on the left has one Vtwin and one Merlin Lite cowl. Note the NACA inlet for the radiator on the Merlin Lite cowl. And several Merlin cowls finished and in the paint shop. Plenty of engine mounts and exhausts shipping soon with some cowls. Plenty of Vtwins and reduction drives in stock. Working on getting more props and spinners. And, of course, everyone gets the latest versions. Finally, some action.

Today I began the Oshkosh prep. I sourced a used trailer that has a tilt option. We will build some wheel channels and wing holders so one person can wheel up a Merlin or Merlin Lite onto this trailer. But for now, I just bolted on some wood support to transport the DEPOD wings to Oshkosh for display. BTW, the 2nd patent on DEPOD was allowed. I know, I told you already. But it is a big deal. To me at least.

The 2 Merlin Lites are getting closer to flying in the Czech Republic. I did say world news after all.

The Merlin Lite on floats was supposed to be at Oshkosh but the container would not arrive on time. And air freight quotes ranges from $17 to $60k! You will have to settle for photos and maybe some video at Oshkosh.




Tonight, I fly to Dayton to finish the Vtwin Merlin. My honeydo list is under control so I actually have time to type some random dribble.

  1. DEPOD: Our Continuation in Part (CIP) for the DEPOD patent was allowed. This is essentially a second patent which expands on the first patent making it considerably stronger. We have added features such as DEPOD motors and props in the horizontal and vertical stabilizers which will of course enhance the STOL performance but also can eliminate the classic base-to-final stall/spins which is usually a fatal error. DEPOD automatically keeps the ball centered preventing spins and can also keep the aircraft inside its’ flight envelope preventing stalls. Kind of like lane assist on many new cars. It can also eliminate the engine failure on take-off issue. The pilot no longer has to choose to land straight ahead or try to make the often-impossible turn to land on the runway. DEPOD has plenty of power to continue the take-off and climb and continue around the pattern for a normal landing.


I removed the DEPOD wing from the Merlin Lite to take to our display at Oshkosh. The Merlin Lite has the short wings re-installed now. As we now have the first finished production Merlin Lites and floats to go with them, we do not have to show this beat up protype any longer. But we will have to air freight a Merlin Lite direct to Oshkosh as the freight companies cannot deliver an ocean container in time. Again. Sigh.

2. Cooling System: Our design needed some fine tuning as the radiator tubes had some engine mount interference.

We solved this by reversing the radiator spigots. Now we can position the radiator in the exact center of the cowl opening. We also have the pressure tank connection molded directly into the cooling tube. And the overflow tube actually changes ID from 5/15 to 1/2 inch. Having this custom cooling system looks great, has minimum flow resistance, and has eliminated all the fittings and adapters except for the few Oetker clamps. And, of course, makes installation super simple and quick.

3. Fuel System: This system has been finished for some time now just waiting on the cowl and installation of any remaining components to see what space was left and what would work best for the fuel pump and pressure regulator mounting. Now we have a plan to mount the two pumps as pictured below which leaves room for the pressure regulator nearby on the firewall and makes plumbing to the fuel supply and to the engine clean and straight forward.

One pump is plenty. All cars and ATVs have just one pump but this is aviation so we install two independent pumps with check valves so the pilot can choose left, right or both for added security and safety.

4. Instrument Panel Circuit Board: Builder Don has made a few more refinements to the main circuit board which houses all the switches and fuses and simplifies wiring. True plug-and-play. For your viewing pleasure:

Don wrote me recently:

There are essentially no CAN interfaces, nor CAN-Enabled microprocessors available in the near term.  There are MANY (hundreds of thousands) on order by Mouser, Digikey, etc., but with lead times that extend well into 2023.

I have never seen such a shortage of electronic components.  It’s very alarming.

I have in-stock ~200 of the PIC18F2420 and will design around this.  It will eventually require an external CAN interface, but those won’t be available again until mid-late 2023.

Similarly, even simple components such as linear voltage regulators, MOSFETS, etc., are becoming unobtanium.


Don will be able to supply these panel boards, so our builders are covered.

And Florida will have a Chip shortage this week as I will be in Dayton……


Hotter than Florida in the summer!

I thought I would head north to Dayton and get out of the Florida summer heat. That great plan failed miserably! 105-to-115-degree heat index every day this week and working inside the hangar and sometimes inside the Merlin.

Pizza oven comes to mind. Tomorrow night I will fly back to Florida to cool off for the weekend. Builder Don and I made excellent progress on this Merlin build this week and one more day left to complete more tasks. Let’s get right to the photos:

The cowl is in the correct position with prop perfectly centered. Now just working out final radiator and fuel pump positioning.

The tail is installed, and rudder cables adjusted, and safety wired. Elevator trim is installed along with the stick grip to control the trim and the PTT. We are trying out the Ray Allen G303 stick grip as it has all the functions we need and is relatively simple to wire up and install.

The wings have a plastic tube installed from the wing root to the wing tip. I didn’t know if I would have to remove the wing tip to access this tube to run the strobe wires. But before the wingtipectomy I wanted to see if I might get lucky. I positioned the strobe fairing in the ‘looks about right” spot and drilled a hole for the strobe wires. Then probed around a bit and shockingly found the tube only about 1/2 inch away! My lucky day. I pushed one wire through then used it to pull the 4 wires I needed to power the strobe. Why 4 wires you ask? Good question.

  1. Strobe power
  2. Position light power
  3. Ground
  4. Sync

Why do you need to sync the strobes you ask? Even better question. Hell if I know. Don says they look better flashing together. To whom? The pilot that cannot see them. Another pilot that can only see one? I suppose that if they are not synced there will be more flashes per minute and therefore safer. Builder Don supposes if there is a sync wire it needs to be sync’d regardless of logic. What do you think?

So now the wing fuel senders and strobes are all wired up and the wings ready to install. Maybe tomorrow.

BUILDER NOTE: Check the forward travel of the stick. The G303 added an inch of height which would interfere with the panel. That is not acceptable. Trim and inch off the stick before installing the handle.

First look at the deluxe panel EFIS. About ready to power it up! And check of the custom upholstery fit.

Panel is mounted on a hinge for easy access.

Sub panel or technically the instrument bulkhead has a 12-volt USB power supply with two USB ports and a volt meter. This unit just about fits perfectly into the lightening hole. It just needs a pass with a step drill then slip it in, tighten the plastic nut on the back, and wire it up.

Next in line are the headset jacks. And after that the parking brake.

If you look inside to the right you can see the electronic valve that switches both the wing tank fuel and the wing tank fuel return line.

All the work we are doing is documented so we can supply the exact parts with the firewall forward package. And we can prepare wiring harnesses mostly finished to simplify and speed up the aircraft build.

And we keep finding big and small ways to make this aircraft even better.

My son (microchip), in college for electrical engineering, got a circuit board birthday cake. He claims a Chip shortage when I am in Dayton.







Progress Report

What? There is progress to report? ‘Bout time!

First, we moved our Dayton R&D center to Barnhart Memorial Airport (30HO) on the northeast side of Dayton. It is a crummy old hangar but on a nice paved and grass strip. Perfect for Merlin and Merlin Lite operations.

We set up a nice workshop with worktables, LED lights, and even labelled the tools properly. Plus, we moved a Merlin that is nearly ready-to-fly with the Vtwin and deluxe EFIS panel installed.

Then we got busy finishing this Merlin. Work completed or nearly completed:

  • Starter solenoid installed and wired
  • 5 antennas installed and mostly coaxed up. Needed one 90-degree BNC fitting which just arrived to finish
  • Most of the cooling system now plumed. Pressure tank and overflow mounted. Important note: We now have 25 cooling kits in stock. This kit, fabricated custom for the Merlin, consists of two molded hoses, one radiator, and one pressure tank. We will also have the 2 smaller relief hoses custom molded and have already sent the 3D model to our supplier
  • Fuel selector electronic valve mounted and mostly plumbed. Fuel return hoses installed
  • Electric trim mounted and wired. New grip stick and PTT just arrived to complete this system
  • Mounted the Vtwin cowl. This was a big step. We determined that we needed one bigger bubble to cover both fuel injectors and the cooling hose and the radiator pressure tank. 2 small bubbles didn’t fit everything. Now the cowl is perfectly centered on the prop hub. We will make a 1-1/4 inch prop extension. And we will mold one bigger bubble and send the 3D images to TPA to have all our cowls made to fit

In other news we are working hard to get the Merlin Lite flying then shipping it direct to Oshkosh. With all the freight issues I sure hope these first two Merlin Lite aircraft arrive in time.

I shipped the float spreaderbar and mounting extrusion by air to TPA this week. One of these Merlin Lites will be on our 750 floats.

I am pretty sure I have the world’s best or at least the most patient customers! We are working through these engineering and supply issues as best we can. Watch this space for even more progress and soon some final results!


Czech Republic Trip Report

It was another epic trip but before I waffle on with irrelevants, I will get straight to business. Everyone wants to know: “When will I get my chit?” So here is what is going on:

  1. Many customers have their Merlin kits but no firewall forward package (FF PKG). There are a lot of components involved. Here is the breakdown:
    1. Vtwin engines. This is easy. We have plenty of engines in stock in Shanghai, but the city has been in lockdown for nearly 2 months. Shipments open on 1 June. We should have no problem shipping engines now but with some limitations. We can only ship 2 per day. That is actually fine. Engines will start showing up at builder’s doors in June. Reduction drives are already in stock in Alabama. We have shelves and bins prepared and a lot of stock arriving almost daily to Alabama. We will box and ship from this center.
    2. From Czech we get engine mounts, cowls, and exhausts. We have around 10 engine mounts done and are welding up exhausts now. Cowls are also being made then painted to match customers’ aircraft.
    3. Props have been delayed due to a shortage of aluminum to make the hubs. This problem is now solved. Props/cowls/exhausts/and engine mounts will all be shipped in the next container. This container will ship in 2 weeks and go direct to Alabama. By the time it arrives the shelves should be full of all the other bits and pieces to make installation complete.
    4. The entire cooling system comes from a racing supplier, and we have 25 sets in transit. Tracking says arrival next Wednesday.
    5. Monday, I fly to Dayton to finish the FF PKG work and documentation plus more work on the avionics and wiring. The week after I will be in Alabama stocking shelves and working on two Merlins in the build program. It is our priority as it should be to get these parts to the customers ASAP. My goal is near everything delivered before the Oshkosh show.
  2. New Merlin shipments: 4 will ship in 2 weeks along with those FF PKG parts. Work has started on 2 more Merlins. Then we will make new parts in batches of 8. These parts kits will ship to Alabama for assembly in USA. The higher labor costs are offset by the out-of-control freight costs, so it is now more economically viable to assemble the Merlins and the Merlin Lites in USA. But realistically it will take 3 months to get the parts and 3+ more months to catch up with orders. We will be accelerating this work by bringing over a couple of my experienced Czech workers for training the USA team. This will be a big help.
  3. Merlin Lite production: The first two Merlin Lites are nearly finished and will be flying soon! Then we will ship them direct to Wisconsin for display at the Oshkosh airshow. Then, after I get to play with them some, off to customers. Not only that, the floats are done too. I plan to have one Merlin Lite on floats at Oshkosh. That is the good news. The bad news is I need 20 parts kit made for USA assembly and that will take 3 months. But once this flow of aircraft gets started we will have plenty. I just feel terrible for those who have waited so long and are still waiting. And I have quickly sent refund checks to a few customers on their request. But for those who wait they will be getting the worlds’ most advanced ultralight! I trust it will be worth the wait.
  4. The Electrolite has some news too. We will be testing two motor systems. The Electrolite will be super nice as an ultralight, a self-launching glider, and/or a floatplane. You can have it all in one aircraft!

Tech Pro just finished a HKS-powered Merlin. They know I need Merlins and will let me have it. If anyone wants this new Merlin I will have it shipped to USA and remake the panel to USA-Specs. It has a rescue chute from CZ. Flew 30 minutes. Looks pretty nice!


Merlin Lite photos!!! The engine is installed, and cowl is being made. Doors are nice. Bubble windows to be added. Chute is above the baggage area which is a good location. Note the extended vertical stabilizer. This should help coordinate with the longer wing. We will add this to new Merlins as well. You can also see the panel is pre-cut to fit the EMS, EFIS, Trim, and engine mags/controls. This is very clean and leaves plenty of room for your phone or iPad nav apps.

Here are some photos of Merlins about to ship. The white one with the Vtwin is going to the Philippines. See the big pile of Vtwin engine mounts. And even photo evidence of this author doing some work. Shocking I know.


OK, there is your business report. Good progress but I wish it was better. Now on to the dribble for those still reading….

Aeromarine’s’ engineer and occasional guest blogger Ben Bosma accompanied me on this trip. I was forced to take him to my favorite pubs and restaurants. Such a host… Beers with my best workers. Miro and Robin are the two that will be in the Alabama assembly center when the kits arrive.

Some of you may recall that I play ice hockey whenever I can. That means I need a good dentist. Mine is really one of the world’s best. He is in Prague but actually Ukranian and has family on the sharp end. I wish him well, yet he still tortured me. Pulled a tooth. Dug out the old roots. Hammered my upper jawbone basically breaking it to push the sinus membrane up far enough for a titanium implant. Google ‘sinus lift’. Then he sliced open the lower gum an inch or so to scrape and scrape and scrape until he had enough bone shavings to fill in around the implant. Then he sliced off some gum to graft to the area around the implant. Then sewed it all up. The medical glove is filled with water then frozen for a cheap ice pack. Glad you kept reading? Good thing Bugsy’s cocktail bar in Prague offers the Painkiller cocktail made with 151.2 proof Pussers rum. I am still recovering…..

I will close this out with a photo of another beautiful church. This one is in Olomouc. And note the banner on this building at the foot of Charles Bridge in Prague. Russia has a history of invading the Czech Republic and the Czechs, like the Ukrainians, are not so willing to let it happen again.


Road Trip

I started this road trip 8 days ago, right after the SNF show ended. This is the first day I have not driven 5-12 hours. I took one day off to catch up with e-mails and to write this dribble.

Here is why pick-up trucks sell best in USA. I am gonna hafta have one some day.

I still am old school and pull a trailer. Here I am all packed to drive up north. And before that, our SNF booth. Here is a link to the video we ran off a battery pack:

The panel image is here to show the color and laser-etching we will be using for our new deluxe MGL panels. Our deluxe panels are going to be very nice with those custom circuit boards and new fuel management system. Those who may not have ordered this panel might want to get their order in soon because that is one line item going up in price. Not because of inflation but because we are providing so much value and it is underpriced and we added a lot more than originally planned.

Thanks very much to my new best friends that helped me manage the SNF booth. Graham, Bob, Art, Brian, and even Jay. And to the current and new customers that stopped by of course.

First stop was in North Carolina to pick up some chutes and rockets from BRS. I now see why they consolidated to NC. Their facility is huge and looks very well-organized.

Next stop was in New Hampshire to deliver the Merlin QBK to new builder Partrick. He has a perfect hangar with a loft and office. Aeromarine needs a hangar like his!

Next stop was Canton, Ohio. Photo above is the same Amada punch press I had in the Czech Republic. It is top of the line and perfect for us. Why? Planning ahead. If freight costs keep rising, we will want to make some Merlin and Merlin Lite parts in the USA. Now we can. Also note that Russia has a history of invading the Czech Republic…. Better to be prepared.

Then on to Dayton. Spent a couple days moving our hangar to a better facility on a nearby airport north of Dayton. We will be happy there and it will be a great place for Merlin builders/flyers to visit.

Then on to Wisconsin. April 18th and it is still snowing. Ice was still on the pond. WI didn’t get the global warming memo… In WI I visited builder Ryan and handed over his Vtwin and MGL panel. I am still in WI and will be heading to Dayton next to finish the hangar move.  Then to Georgia to deliver another Vtwin and panel. Then to Mobile, AL to set up our newest build center with Paul Mathers at M-Squared. Then finally the last leg back to home base in Florida to test my water-skiing skills again….

Builder Bob will be happy to see his Merlin about ready to ship. This one looks great!





Merlin Guest Blog: Ben Bosma

Guest Blog from Engineer Ben Bosma:


Here are the first versions of the new Merlin instrument panel. 90% of the information is presented by the MGL iEFIS. I pasted the iEFIS into this picture. Chip will have an actual one on this panel at Sun N Fun.

The rest is technology we’re developing. First, the engine information is normally channeled through a box from MGL. We are developing our own mainly because we can. The data coming from the ECU has everything we need from the engine. Second, we’re using printed circuit boards with microprocessors to do our switches. All the switches are dual pole for redundancy. We are also using fuses which are difficult to see when they blow. That’s what the LEDs are for. They light when a fuse blows. The fuses are standard automotive products and can be replaced from the front panel. All of that is on the left. On the right is the fuel panel and fuel pump control. There are two fuel pumps. They are plumbed so that you can use either pump or both. If a pump fails, you have a backup. Part of the preflight will be to check each pump. If a pump fails a red LED indicates which one is out. The other pump bypasses the bad pump with a check valve.

Why not circuit breakers? Have you priced them, lately? There’d be about $1000 in breakers in this panel vs about $10 in fuses and $20 in holders.

Above those switches is a left-auto-right switch for tank selection. We are using an automotive fuel tank selector valve that is electric. It has dual spools that allow both the supply and return to be switched.

This allows us to instantly switch tanks and since it’s electric we can automate the tanks switching either by time or quantity always keeping the tanks balanced. Of course, you can manually override the automatic tank switching by simply selecting the desired tank. Fuel management is the third highest cause of accidents. Engine out work with fuel in one tank and dry in the other is not okay.

There are fuel senders in each tank which display the quantity in each tank at all times. Since, we have a microprocessor on each board, we’ll just ask it to do a little bit more for us.

Automatic tank selection is something you don’t see on most GA aircraft. It’s a jet thing. Of course, there will be lights indicating the feeding tank.

The panel is hinged on the bottom so you can easily wire and inspect your wiring. It’s not a big panel. 22-1/2″ wide. It’s got everything you need within easy reach.



The V-Twin is a very advanced engine not just with its induction system which has dual overhead cams and electronic ignition but also, it’s cooling system which is entirely liquid-cooled.
Originally, we were using commercial cooling hoses joined with aluminum tubes, nipples and connections. This looked cobbled together and although perfectly adequate was heavy and too complex. So, we now have custom silicone hoses that are molded to our specification. While we were at it, we also designed and had built a custom radiators and custom coolant cans.
The radiator is in the prop disc so even though the ECU has a coolant sensor and fan control we don’t need it. Temperature is controlled with a mechanical thermostat in the coolant loop just like a car.
We put the coolant can at the highest point in the loop and has a 1.3bar cap and overflow tank.
Our hose vendor gave us a broad choice of colors. We picked blue. What do you think?