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#11
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BMW engine aircraft suitable?
Philippe wrote:
.... At this time, nobody built an alternate engine lighter than an aircraft design engine. are you joking? 193 HP @ 60 Kg that is turbine land..... |
#12
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BMW engine aircraft suitable?
Ralf Mueller a écrit:
At this time, nobody built an alternate engine lighter than an aircraft design engine. are you joking? 193 HP @ 60 Kg that is turbine land..... Rendez-vous when this engine will fly.... At this time, yes, it is jokes. This BMW engine is not easy to use, it'built on the same sheme than japenese engines. -- une télé qui s'éteint et c'est un cerveau qui s'éveille Philippe Vessaire Ò¿Ó¬ |
#13
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BMW engine aircraft suitable?
On Nov 27, 1:57*pm, Philippe wrote:
Ralf Mueller a écrit: At this time, nobody built an alternate engine lighter than an aircraft design engine. are you joking? 193 HP @ 60 Kg that is turbine land..... * Rendez-vous when this engine will fly.... *At this time, yes, it is jokes. *This BMW engine is not easy to use, it'built on the same sheme than japenese engines. -- une télé qui s'éteint et c'est un cerveau qui s'éveille * * Philippe Vessaire *Ò¿Ó¬ Not sure about the BMW but most of these motorcycle in-line 4's have a separate cylinder block and a split crankcase a la Lycoming/ Continental. All the expensive, hard to reverse engineer, power tricks are in the cylinder block and heads. So, learn about metallurgy and CNC machining. Make a custom crankcase and crank for two in-line 4 blocks. Presto! A silky smooth, liquid cooled, opposed 8 cyl 300 HP airplane engine. The motorcycle-type balanced crank throws eliminate a need for a flywheel and the 5:1 planetary PSRU fits in the nose case. 2.0 liter is probably overkill so look for a 500cc in-line 4. |
#14
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BMW engine aircraft suitable?
"Karl-Heinz Künzel" wrote in message
... Morgans schrieb: "Ralf Mueller" wrote in message ... just read about the new BMW S 1000 RR bike. The complete engine assembly is less than 60 KG. Engine puts out 193HP (112 Nm, 12,000rpm). Wouldn't that one (slightly detuned) make a nice SLA powerplant ;-)) 193 HP ??? Are you positive about that number? I would like to see where that number came from, if it is available on the net, if you wouldn't mind. If it is correct, that should do rather nicely. People have flown BMW bike engines in the past. I believe that most of the successful ones have used a different gearbox to reduce the prop RPM. Seems to me that I remember that they adapted a Rotax gearbox to the job, but I doubt that there are any Rotax gearboxed that could handle 193 HP. Here in Germany we do have this BMW conversion - http://www.takeoff-ul.de/pdf%27s/Des...ne_02-2006.pdf but those numbers are far away from 193HP (112 Nm, 12,000rpm). KH The spur gear system should work reliably provided that the centrifugal clutch is on the engine side, rather than the propeller side, of the gears. Peter |
#15
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BMW engine aircraft suitable?
bildan wrote:
On Nov 27, 1:57 pm, Philippe wrote: Ralf Mueller a écrit: At this time, nobody built an alternate engine lighter than an aircraft design engine. are you joking? 193 HP @ 60 Kg that is turbine land..... Rendez-vous when this engine will fly.... At this time, yes, it is jokes. This BMW engine is not easy to use, it'built on the same sheme than japenese engines. -- une télé qui s'éteint et c'est un cerveau qui s'éveille Philippe Vessaire Ò¿Ó¬ Not sure about the BMW but most of these motorcycle in-line 4's have a separate cylinder block and a split crankcase a la Lycoming/ Continental. All the expensive, hard to reverse engineer, power tricks are in the cylinder block and heads. So, learn about metallurgy and CNC machining. Make a custom crankcase and crank for two in-line 4 blocks. Presto! A silky smooth, liquid cooled, opposed 8 cyl 300 HP airplane engine. The motorcycle-type balanced crank throws eliminate a need for a flywheel and the 5:1 planetary PSRU fits in the nose case. 2.0 liter is probably overkill so look for a 500cc in-line 4. How many engines have you built and flown? |
#16
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BMW engine aircraft suitable?
On Nov 27, 5:22*pm, cavelamb wrote:
bildan wrote: On Nov 27, 1:57 pm, Philippe * wrote: Ralf Mueller a écrit: At this time, nobody built an alternate engine lighter than an aircraft design engine. are you joking? 193 HP @ 60 Kg that is turbine land..... * Rendez-vous when this engine will fly.... *At this time, yes, it is jokes. *This BMW engine is not easy to use, it'built on the same sheme than japenese engines. -- une télé qui s'éteint et c'est un cerveau qui s'éveille * * Philippe Vessaire *Ò¿Ó¬ Not sure about the BMW but most of these motorcycle in-line 4's have a separate cylinder block and a split crankcase a la Lycoming/ Continental. *All the expensive, hard to reverse engineer, power tricks are in the cylinder block and heads. So, learn about metallurgy and CNC machining. *Make a custom crankcase and crank for two in-line 4 blocks. *Presto! *A silky smooth, liquid cooled, opposed 8 cyl 300 HP airplane engine. *The motorcycle-type balanced crank throws eliminate a need for a flywheel and the 5:1 planetary PSRU fits in the nose case. 2.0 liter is probably overkill so look for a 500cc in-line 4. How many engines have you built and flown? I've re-built and flown a lot of aircraft engines - including an Allison V-1710. I've also built a lot of racing engines for both cars and motorcycles. I understand the good and bad of each. |
#17
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BMW engine aircraft suitable?
"stol" wrote Bellt drives do just that. Indeed, and they would be my favored means of PSRU. With this case, we are talking about needing between a 4:1 or 5:1 reduction. That would make for a mighty big big pulley. ;-) -- Jim in NC |
#18
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BMW engine aircraft suitable?
On Nov 28, 9:40*am, "Morgans" wrote:
"stol" wrote Bellt drives do just that. Indeed, and they would be my favored means of PSRU. *With this case, we are talking about needing between a 4:1 or 5:1 reduction. *That would make for a mighty big big pulley. ;-) -- Jim in NC 5-1 ,,,, Geez, that ain't no pulley... Thats a spinner with grooves... GG |
#19
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BMW engine aircraft suitable?
bildan a écrit:
Molt Taylor was right. It's really hard to make a PSRU work well on any engine with less than 8 cylinders. That's one reason why I suggested fitting two small displacement, 4-cyl blocks together to make a flat-8. A six cylinder in row or any engine with balance shaft may do the job. Or, better, a Wankel.... I agree with the planetary gear (C6 from Ford transmission ?) The chalange is always the dynamic comportement, vibrations may cause severe overloads. -- une télé qui s'éteint et c'est un cerveau qui s'éveille Philippe Vessaire Ò¿Ó¬ |
#20
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BMW engine aircraft suitable?
On Dec 3, 10:35*am, Philippe wrote:
bildan a écrit: Molt Taylor was right. *It's really hard to make a PSRU work well on any engine with less than 8 cylinders. *That's one reason why I suggested fitting two small displacement, 4-cyl blocks together to make a flat-8. * A six cylinder in row or any engine with balance shaft may do the job.. Or, better, a Wankel.... *I agree with the planetary gear (C6 from Ford transmission ?) The chalange is always the dynamic comportement, vibrations may cause severe overloads. -- une télé qui s'éteint et c'est un cerveau qui s'éveille * * Philippe Vessaire *Ò¿Ó¬ There are planetary gear sets from every major auto maker in the world so there are hundreds to choose from. The drag race guys sell beefed up planetary units in any ratio you can think of. I was thinking of 8 cylinders for another reason. It's very hard to see how two spark plugs could fit in a cylinder head with 4 valves and two overhead cams. A second strategy could be to run 4 cylinders with one ignition system and the other 4 with a 2nd system. If one failed, the engine would still run on 4 cylinders albeit with only ~30% power, but that might enough to get me to an emergency landing field. A 6 cyl running on 3 might not. |
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