In belgium (country I live) the conversion of a 650 cc V-Twin Suzuki has already been made to fly a ultralight Calypso (also made in Belgium) See the link
There is even a short film at this site. It has even the clutch working and the dashboard from the bike is in use at the plane. Nicely made...
This is the exact engine I am going to try to set up on my FreeBird Innovations (Home). It is set up for a rotax 582, but for not much more weight, I think it is feasible. I have located a whole bike, that way I get everything I need to make it run separate from the bike frame. I'll post pictures as I get this conversion going.
-Erwin, Thanks for the links, I thought I was going to be the first to try this setup! At least now I know it can be done! I tried to email the guy, but never heard back from him; different languages complicates things.
The Kawasaki ZX-10R could also be a good engine to convert for flying, it is light (less than 60kg) and with RAM air has some 200HP. Add a turbocharger, it goes up to 250HP and then, the sky is the limit. The only problem is the turbo chargers aren't cheap and the used ZX-10R engines aren't easily found...I have both a Hayabusa and Kawasaki ZX-14 motorcycles. The Kawasaki is a much smoother engine than the Hayabusa. The Hayabusa has much better mid range torque and considerably better fuel efficiency.
I would think that a choice worth considering is a engine from the Kawasaki ZX-14 Concours motorcycle. It has variable cam timing and is tuned to have more mid range torque. Otherwise I might consider the ZX-14 if vibration is an issue and have a special set of cams ground to shift the power curve downwards. If vibration is not an issue the Hayabusa engine is an extremely solid one (I have a turbocharger on mine that makes 300 hp and it's rock solid). I can't see paying $8500 though.
HI ClanonJust wondering how a CVT (a light one) could do the PSRU job...
For the few minutes (if it's not seconds) before the engine will desintegrate, yes it is...The Kawasaki ZX-10R could also be a good engine to convert for flying, it is light (less than 60kg) and with RAM air has some 200HP. Add a turbocharger, it goes up to 250HP and then, the sky is the limit. The only problem is the turbo chargers aren't cheap and the used ZX-10R engines aren't easily found...
What about weight penalty ? (if any)HI Clanon
I did a math exercise on the CVT, somewhere in this forum before,
The CVT will keep the engine RPM up so it deliver 100% power, it is about 90% efficient or was it 85%?, so it loose or lose? 10%-15% but can run the propeller up to say 95-96% of max at climb, a fixed pitch-fixed gear set-up will have 80-95% rpm and power, the gearbox rob 2-5%
So at climb, the CVT can have a + but at cruise the fixed gear wins, on a light fast plane with a small (relative) engine I honestly think the CVT can be useful.
Question is if it is up to continous power of 60-80%
At cruise the fixed gear version will save 10% fuel. = a-lot
If I remember correctly it was safe for a few seconds (less than 10) at 250HP, around a minute at 220HP but it could endure quite a long time at something just below 200HP.For the few minutes (if it's not seconds) before the engine will desintegrate, yes it is...
Well that depends on your perspective of 'flying for hours' as opposed to riding for hours...As Motorcycle engines have been used in airplanes for a long time, but Motorcycle engines, though very high technology these days and capable of putting out huge horsepower, are not designed to operate like airplane engines.Airplanes can fly for hours on end at a steady 70 percent power, motorcycles usually operate far below that level with occasional bursts of high revs.