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3 January 2002, 07:57 AM

Slightly Modified VW engines with a REDRIVE of about 2.2:1 would be good. This would give you a Prop RPM of about 1363 RPM at engine RPM of 3000. This would allow a 85-90" prop or more. Remember a redrive is a torque multiplier, not just a rpm adjuster. There are a couple of new small scale radial engines out there but haven't been proven as of yet. If you build a heavy duty full scale you can use a modified M14P Russian Radial. Steve Culp of Culp Aviation is building Sopwith Pup kits to use this engine . Normally, the M14 is of 280-360 HP at 2900+ RPM. It uses a redrive. Steve Culp is removing the redrive and putting on a cover from another Russian engine and Running direct drive at 1800 rpm and getting 160 hp.
Should run forever at this speed.
Cher'o,
Lt. Dwight Rudder, RFC
Great War Aeroplanes Asso.

3 January 2002, 07:57 AM	#6 (permalink)
rudder Guest Posts: n/a	Slightly Modified VW engines with a REDRIVE of about 2.2:1 would be good. This would give you a Prop RPM of about 1363 RPM at engine RPM of 3000. This would allow a 85-90" prop or more. Remember a redrive is a torque multiplier, not just a rpm adjuster. There are a couple of new small scale radial engines out there but haven't been proven as of yet. If you build a heavy duty full scale you can use a modified M14P Russian Radial. Steve Culp of Culp Aviation is building Sopwith Pup kits to use this engine . Normally, the M14 is of 280-360 HP at 2900+ RPM. It uses a redrive. Steve Culp is removing the redrive and putting on a cover from another Russian engine and Running direct drive at 1800 rpm and getting 160 hp. Should run forever at this speed. Cher'o, Lt. Dwight Rudder, RFC Great War Aeroplanes Asso.