OK! I vote with James. There, John, it's two to one. You lose. I do agree with John on one item. If you cannot feed enough fuel to get the desired HP, but you have a prop that allows the engine to over rev, you will get higher rpm without the extra HP.
Larry "James W. Duffy" wrote: > OK, girls, let me put my two cents worth in. I changed the venturi and the > jet in my carbuerator to the C-85 size and got the increased RPM > without changing props. Horse power and RPM are related, no increase in rpm > no increase in horse power. Jim N87349 > -----Original Message----- > From: John Cooper <[EMAIL PROTECTED]> > To: [email protected] <[email protected]> > Date: Wednesday, December 29, 1999 11:22 AM > Subject: Re: [COUPERS] Take off / landing performance > > In a message dated 99-12-29 10:18:32 EST, you write: > > > As you know, the only > > significance between the 75 and the 85 is the RPM. The prop is what > gives > > you the > > extra revs. I would think that going down to a 46 would mean you really > > have to watch > The C-75 has a smaller carburator throat. That is the ONLY physical > difference and the 75 simply can't breath well enough to make 85 hp, no > matter how high you get it to rev. (finer pitch results in lower prop > loading so your higher revs are at reduced manifold pressure, hence lower > power.) Continental approved conversion to 85 HP: change carb. > > Many C-85 installations call for the 7148 as the standard prop. 46 is climb > and 50 is cruise. > > John > > __________________________________________________________________________ __ > ____ > To unsubscribe from this list please send mail to > [EMAIL PROTECTED] > > _____________________________________________________________ > Get your favorite topic delivered daily. > http://www.topica.com/t/11 > > __________________________________________________________________________ ______ > To unsubscribe from this list please send mail to [EMAIL PROTECTED] > > _____________________________________________________________ > Get your favorite topic delivered daily. > http://www.topica.com/t/11 __________________________________________________________________________ ______ To unsubscribe from this list please send mail to [EMAIL PROTECTED] _____________________________________________________________ Get your favorite topic delivered daily. http://www.topica.com/t/11
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