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Old 03-23-2006 | 01:42 PM
  #35  
britbrat
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Default RE: Different between 4 cycle prop an 2 cycle props??
ORIGINAL: JohnW

Britbrat, a 12-5 APC @ 11,100 RPM I’m showing in Thrust HP to be over 1HP, not the 0.6HP you mention. How did you compute the 0.6HP?

Cheers.
How I did that is by making a mistake in reading my own test data -- I inadvertantly pulled the RPM data from an 11-6 APC on the GP 42 [] & for some reason I couldn't find the test data for the 12-5, so I quoted the output from my old test calcs for an APC 11-7, which has a very similar load to a 12-5, thus giving me ~0.6 HP.

But it gets even more confusing -- I just looked at the prop on the model -- it's an APC 12-4 -- which is why I didn't have data for a 12-5. Sooo, I checked the proper notes & it swings that 12-4 @ 10,500 RPM -- sorry for the confusion. [&:]

However, all is not lost, I double-checked the TT 40 Pro data and that does indeed turn the 12-5 @ 12,700 RPM.

Too many seniour moments these days.
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