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Prop Too Short?
Prop Too Short?
08 Jun 2023 23:30 #1
by Warren Hampton
And remember round tip and flat tip are measured differently.
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11 May 2023 22:10 #2
by Matt Gunsch
depends on the TCDS for the prop,
A&P, IA, PPSEL
too many years GA and Warbird Maint
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11 May 2023 16:11 #3
by Larry Snyder
If the engine has been converted to a C85 then 69.5 inches is correct. The C75 has a range of 71-73 and the C85 is 69.5-71, IIRC. TCDS A-718 has it spelled out, albeit in a confusing, complicated government way.
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11 May 2023 16:02 #4
by Super User
Based on that number, yes. But, check with a prop shop. They often measure things a little differently than we might.
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Jerome Carncross
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Topic Author
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11 May 2023 15:58 #5
by Jerome Carncross
I am a relatively new owner of this aircraft and have about 25 hrs on it so far.
We measured the prop length on my 1947 415C during my first annual inspection and found it to be 69.5 inches. It is a McCauley 1B90 and is stenciled 7148. The engine is a Continental C - 75 -12F with a Marvel Schebler carburetor and log book entries indicating retuning for 85 hp. The Type Certificate says the diameter of the prop can be a maximum of 73" and not less than 71".
Is this prop considered air worthy?
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Prop Too Short?
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