prop question
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Join Date: Sep 2002
Location: Chichester, UK
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prop question
I've been sent a question:
any ideas?
Propellers here [USA] are specified by diameter and pitch (travel per rev). I have a prop for a small plane in my posession made in France that is specified as 695-200-103. I know that the 695 is the diameter in mm but what do the other two numbers represent? I would expect the pitch to be about 600 mm as well.
The French usually specify diameter and pitch in centimetres. But,
A typical light aircraft prop is around 55-65" in diameter, with 40-60" pitch.
That would mean we should see one number in the region 140-165, and another in the region 100-150.
Based upon that, my best guess would be that the 695 is actually the radius (not diameter) in millimetres, the 200 probably signifies a 2-blade prop, and the 103 is proabably the pitch in centimetres.
So in inches, it's probably 54" x 40½", which would be about typical of the sort of prop fitted on something around C150 sized.
This is however educated guesswork having worked on quite a few French aeroplanes, and I don't actually know.
G
A typical light aircraft prop is around 55-65" in diameter, with 40-60" pitch.
That would mean we should see one number in the region 140-165, and another in the region 100-150.
Based upon that, my best guess would be that the 695 is actually the radius (not diameter) in millimetres, the 200 probably signifies a 2-blade prop, and the 103 is proabably the pitch in centimetres.
So in inches, it's probably 54" x 40½", which would be about typical of the sort of prop fitted on something around C150 sized.
This is however educated guesswork having worked on quite a few French aeroplanes, and I don't actually know.
G
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Thanks, Genghis - I think that 695 really is the diameter; a bit of educated guesswork makes me think that the propeller is from a Cri-Cri, which would presumably make it a rather unusual propeller. This is backed up by Google - a search for the numbers in question comes up with "Two-bladed composite MC 695 - 200 - 103" on a page called "Caractéristiques du CRICRI".
