Hallo Christian, habe deine handwerkskunst auf deinem RU-vid channel gesehen. Allllller größten Respekt! sag mal wie weit ist dein neues variable pitch prop Projekt? Hab auch eine vq pc6 mit einem 6374 und würde die gerne wie deine mit vp ausstatten. handwerklich für mich kein thema, währe es möglich nähere Infos zu deinem pc6 prop zu kriegen? Fotos von der Mechanik, Details, oder Pläne? Würde es sehr gerne bauen. Gruss Vitali
Great work. Unbearable music. Perhaps even a bit of AI commentary would have been better than the death metal. Awesome video nonetheless. So much content and talent that I have to watch it again!
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
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
In rewatching this.... question: did the two props totally and equally cancel the others' torque and p factor? In another RU-vid 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?
Yey, I think so. I have never measured resulting torque or p factor. But on the airplane, I set the side thrust angle to zero. The plane takes off perfectly straight without any rudder input. Also, while accelerating from slow flight, I do not notice any of the usual warbird tendencies. It really behaves more like turbine powered.
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?
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
Danke! Ne, bei uns in der Schweiz ist man bei dem Thema nicht so empfindlich. Auf historischen Flugzeugen oder Fahrzeugen z.B. ist das Kreuz erlaubt. Ich weiss, dass es in DE ganz anders aussieht.
I have never measured the static thrust but it will be somewhere around 8Kg, maybe 9. Power is 2800 Watts. So not very efficient but this was never the goal.
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 "
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?
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!
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
