> Francois Badoux wrote:
     >
     > Hi,
     >
     >
     >
     > One of you guys (sorry, lost the email and the name) asked me if it was possible to fit our planetary redrive on an Allison turbine (was it a
     250-C18 you
     > mentioned?). The answer is: I don't know for sure, never tried. But I did my homework this weekend and come with the following hypothesis:
     >
     >
     >
     > Shaft RPM on the 250-C18 is 6000 RPM, with our redrive present ratio of 2.8231:1, it would yield 2125 prop RPM... quite good in cruise, a bit on
     the low side
     > on t/o unless you can compensate with a large diameter prop or with plenty of surplus power. The 250-C18 maximum power output seems to be 317 Bhp,
     no sweat
     > for our redrive. The 250-C20 is 420 Bhp... well, it would definitely have to be tested before flying!
     >
     >How about a 6 pinion planetary with 2.17:1 ratio.That should be in the right area of rpm!  For a pusher prop,it could still use an antivibration
     coupling! It surely will handle the hp without any problem.   Cheers  John Vlake.

 
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