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"It is stable during high Revolutions per minute, due to the adjustable track sliding sleeves."👍

Marvelous work. I tought a radial engine 3 stoke was not possible. Due to the canceling effect of the pistons on the crankcase not contributing to scavenge the fuel properly

it kinda sounds like this helicopter from one of my favorite shows Air Wolf

As these engines require positive crankcase pressure to operate, I can fully see why you had to incorporate a supercharger...

Ventom cylinders/pistons and high compression heads are the way to go.

Thanks for sharing! ~25 years ago I was flying U-control 1/2A with 3 up combat with a super simple basically indestructible home brew planes with 049 black widow motors. My third black widow motor I got was a dud, would barely get 14K rpm, where my other two 049's was in the 18K rpm range with 10% nitro, thimble drone 5x3 prop. Troubleshooting the dud, a friend showed me how to lap sand the case at the carb/tank mount (1500 grit sandpaper put on glass and sprayed with wd40 and sanded in a figure 8 pattern), it knocks off the bulge of the 4 course carb/tank mounting screws (a black sharpie put on before the sanding will show the progress). This did not seem to help the dud motor,,,,but I got an idea. Why not try it on where the cylinder screws in (effectively changing the timing). I passed my idea by a buddy that road raced the two stroke Yamaha RD400 (and was a auto/diesel mechanic), he said I should raise the exhaust ports (so not remove material, but add to it), so I made a 0.010" base gasket, this made it a super dud motor, lol. To scientifically gauge what I was about to attempt I measured the height of where the cylinder screws in to the case (see picture of the red lines where I measured - from case to where cylinder screws in), I call this deck height, my normal two good motors was 78 thou (0.078"), the dud was 84 thou, instantly a big grin appeared. With the precision these cox motors are built to, wth was going on with this spec, 0.006" too tall. I started by taking 5 thou off (glass/sandpaper/wd40, same as I mentioned above) and retesting, result was better, another 5 thou, even better, another 5 thou and was getting hard to start. Then I thought why it was hard to start, hmmm, way to much compression, perfect, the head gaskets were 5 thou, I can compensate with head gaskets, so for every 5 thou I removed from the deck, I added 1 more head gasket. After continuing this process a few more times (I went down to 53 thou from 84), it turns out, 15 thou off the good motor (was 78 thou, now reduced to ~63 thou with 4 head gaskets (1 original +3)) was the best. Results are with 10% nitro, Thimble Drone 5x3 balanced prop and plastic reed valve. Bone stock good motor with 78 thou deck height = 17-18K rpm, Bone stock dud motor with 84 thou deck height = 14K rpm, Best was reducing to ~63 thou deck height (on all motors), with a total of 4 head gaskets, 25Krpm and one hit 26Krpm. A gain of 7K rpm! For pictures and discussion, google search coxengineforum black widow tuning

EXCELENTE SERVIÇO 👍👏🏻👏🏻👏🏻👏🏻👏🏻👏🏻👏🏻👏🏻👏🏻 🇧🇷

Great engineering , music got on nerves tho 😂😂😂

In rewatching this.... question: did the two props totally and equally cancel the others' torque and p factor? In another RUclips video out there, the motors with their props are set on a kitchen scale to measure thrust. I mean, they're not mounted to anything. The props were zooming and the assembly didn't move a bit. Did this really work for you, too?

The best RUclips video on contra rotating props!! Fantastic!

Good that the shape of the compressor rotor is hidden behind an aluminum case. 😂

😮 the sound of that aircraft was just... WOW!

I didn't understand the compressor part. Does it work like fuel injection?

Very cool project! I'm curious as to why all of your connecting rods float in the main con-rod carrier. Doesn't one con rod usually serve as a master con-rod to control the rotation of the con-rod carrier?

No way. Just came across my feed. Im half done with the same build. Never thought about supercharged tho....

Superb !!!

Are there engines or plans or 3d models for sale?

Totally awesome mate 💪👍😄

I am a PC-6 pilot and your use of Bêta Range is astonishing ! Wish some dedicated RC manufacturer would think, design and sell consumer variable pitch hubs with scale details, that would be awesome

Y las jodidas bujías no las puedo conseguir en ningún lugar de México, ni los adaptadores Cox 049. No pienso comprar al triple de precio desde Canadá ó Europa ó Amazon. Ni ebay

Maybe instead of the music, narration of the idea, planning and execution of the project.

obviously this is amazing.

Tolles Projekt und interessante Ausführung. Btw. hat der Verfassungsschutz schon wegen des Kompressors an die Tür geklopft?

That is a thing of beauty. Amazing! ❤❤❤🙂

Put the . 051 glo heads on it! It will scream. I hope the cylinders are the two fuel port plastic airplane type.

Wow 👏👏👏

How much static thrust? And at what power?

That is really awesome " I love it" I'm surprised how slow it runs, I was thinking it would sound like a hive of angry bee's " but it sounds really nice" it's great and I want one on a plane" great job " fantastic "

What a sweet build. Fantastic.

That is friggin cool....even the making of a tap was impressive in its own right....just curious what keeps the main bearing oiled, pre-mix like typical two stroke?

Christian where is your flying video please? How did you calculate what propeller it would spin?

Excellent video

Well done.

I really enjoyed the video! GFY to the commenters regarding the music READ THE AUTHORS COMMENT (OVER 4 YEARS AGO) FFS - REAL viewers are here for the engineering excellence - the music was just a bonus. Also GFY to the so called experts (RE gas engine etc) - its not their project. I think it is all due to jealousy. AMAZING EFFORT - All the best!

Impressed. GJ

can you show how you made the the crank and rod setup?

Incredible skill. Got some heavy use out of my mute button.

Meine Güte, die Musik ist einfach fürchterlich. Da gibt's einen Daumen runter, trotz des faszinierenden Projekts 🤷🏼‍♂️

ez fehlt nurnoch ein planeten antrieb damit du beide rotoren mit gleicher drehzahl hast und somit beide motoren besser arbeiten :)

Brilliant work. Don’t understand the need for loud music. It detracts from the excellent content

Very cool,,, !! Great hand craft !! 👍👍👍

One of the best RC projects I have seen undertaken. The complexity involved must have been chaotic. I simply love the end result. Thank you for sharing your special moments with us. Cheers

Bravo. Impressionnant.

Baue mir bitte einen 6 Zoll prop VPP quadcopter für 3D mode FPV freestyle. Muss extrem leicht sein und stabil. :D Beste Grüße aus Luxemburg.

Safety glasses while working on the Mill!!!

Thank you. Awesome skillset. Congratulations. Keep up the good work.. and perhaps wind down the music - it detracts from your achievement.

Would have been more informative with narration rather than the irritating music.

now you have the concept you should work out any kinks and just mass produce this! I would buy

Don't ever put your hand to the side of blades please!

Mind blowing quality at 6am. Well played sir.