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HelicopterKasama Srimok 90 › Srimok Headspeed?
12-29-2009 04:46 AM  7 years agoPost 1
wreckless

rrApprentice

Colombia S.A.

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I have 1950 rpms IDL-2,1900 in IDL-1,1820 in Norm.My gear ratio is
8.25:1,so 1950 x 8.25=16.087 rpms in the engine shaft, that is to much for an O.S. 91 it sopousssed to give 3.4 H.P. (max power)at 14.500 to 15.000 RPM´S,I think maybe I am doing something wrong in the
equation,I have 1950 RPM´S with a optical tach.
wreckless

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12-30-2009 04:10 AM  7 years agoPost 2
racemwyatt

rrNovice

Oklahoma City

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your calc is correct. Change to the 98t Gear. and a head speed of 1850. that will get you close
98/12 = 8.16
8.16 x 1850 = 15,096 rpm

I told my parents I wanted to be a pilot when I grew up, they said I can't do both!

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