Remenber, we are not talking just about HP. When you "loaf" an engine rated at 100 HP@4000RPM, ...that is retrict it's use to 3200RPM, you lose brute force, Torque, the power to get out of tight spaces,....prop pitch options, SLOW AND HI SPEED manuevering, short runways and on and on. Everything is a compromise....but do-able. Just decide what YOU want. I recall an exam question in college; "Determine the weight on the ground, of a new 1958 Ford traveling at 60MPH. As I recall, the car weighed 3800lbs as equiped and at 60MPH, the total weight on the ground was 14.5 lbs. Don't quote me though. I may have got the question wrong, but passed the test!! That was more than a half century ago!! The point I am getting at is; with a weight of 14.5 lbs/60MPH that ford engine was "LOAFING", easily handling the job....like the fellow with the BMW motorbike and my friend with the Buick. HOWEVER I did demand much more from that engine to get me from zero to 60. AND YOU WILL NEED TO GET AIRBORNE.
----- Original Message ----- From: "phillip matheson" <phillipmathe...@bigpond.com> To: "KRnet" <kr...@mylist.net> Sent: Monday, July 04, 2011 6:11 PM Subject: KR> BMW engine v VW and Corvair > What is the actual HP at 3400 RPM (prop)? Will it turn out to be 40HP and > 145 lbs in weight??...or 3.6 lbs/HP. Will 40HP satisfy you in a KR1? > ------------------------------------ > > This has always been my question when using car engines in aircraft. Take > my > VW type 4. It has a gear reduction and the engine RPM reaches 4000 = 100 > HP > > If you check the Corvair link http://carnut.com/specs/gen/vair60.html It > states the RPM required to reach 110 HP or more is 4000 to 4500. > The corvair is of course 6 cylinder, but till only 110 hp or so depending > on > which engine you are using, so if you guys are less than that , how do you > know what the HP is? > > >
