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Old 08-30-2002 | 02:04 AM
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Terry Holston
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Default Needle valve settings on OS91
Originally posted by F900
Jackjet,

I know there can be many reasons why, but whats the difference between an OS 91Ramtec Vs BVM 91 setup. Is it that the OS has more "pull" and the BVM produces more Rpm's

Anyone care to answer ?

Thanks

Robert
You are correct, the BVM is slightly smaller in Dia and the BV .91 is a higher RPM engine than the OS. Also the Ramtec fan has more pitch on the blades than the Dynamax and "Loads" the engine down, giving more "Torque" or low end thrust. launching the plane quicker. Good for grass field operation.

Does that help?
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