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Author Topic: Anyone know of a cross refence chart for prop sizes ?  (Read 1151 times)

ghost123uk

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Anyone know of a cross refence chart for prop sizes ?
« on: October 02, 2010, 12:40:29 PM »

I used to use Mocom alloy props on my CMB67 powered multi. (now sadly sold 2 years ago)
A 2024 or (2023 for rougher water) was normal.

Now, my new (to me) Fairey Swordfish has been tested with various Plastic (black) props and a 52.5 "X" pitch seems about right.

Question = what would that be in Mocom numbers ?

I bet there is a comparison table somewhere, but I cannot find one !
(note = I have seen the suggested prop by engine size chart that quotes Mocom type numbers).

There is a Mocom size chart at PMB ( here = http://www.prestwich.ndirect.co.uk/mocompropellers.htm )

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ghost123uk

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Re: Anyone know of a cross refence chart for prop sizes ?
« Reply #1 on: October 02, 2010, 02:20:20 PM »



There is a Mocom size chart at PMB ( here = http://www.prestwich.ndirect.co.uk/mocompropellers.htm )



I just found this chart on PMB for plastic prop specs. (here = http://www.prestwich.ndirect.co.uk/plastic_props.htm )

Trouble is it only gives specs for "X" pitch  :((
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w3bby

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Re: Anyone know of a cross refence chart for prop sizes ?
« Reply #2 on: October 02, 2010, 09:43:06 PM »

I believe you have answered you own question, however:

The 52,5X that you are using has a pitch of 73,5mm according to the chart so X in this case gives you a diameter:pitch ratio of 1,4 (52,5 x 1,4=73,5). The mocom nearest to that from the mocom chart would be the 1748M, 52mm diameter x 74mm pitch. I have never been able to work out what the mocom numbers refer to.. At least the newer numbers, 5780 and 5983, refer to diameter and pitch in mm.
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