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 Surface drive (drive and driven pulleys) 
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Marque
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Joined: Tue Feb 16, 2016 2:40 pm
Posts: 6
Post Surface drive (drive and driven pulleys)
Just wondering what diameter the drive and driven pulleys are on the most popular surface drive setups?
Tue Feb 16, 2016 8:05 pm
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Gigafowl
MMT Elite Member
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Joined: Tue Jan 13, 2009 7:19 pm
Posts: 6441
Location: Trinity Bay - Texas
Post Re: Surface drive (drive and driven pulleys)
To add to what I sent you by PM


From memory they all have an rpm reduction from motor to prop...
"gearing" is a combination of reduction and prop pitch....

PD used to be 1.5 to 1 when they ran a 12 inch 12 pitch on 36hp
GT used to be 1.2 to 1 when they ran a 10 inch 10 pitch prop on 35hp
GD is still 1.4 to one when running a 12 inch 12 (maybe 11 1/2) 3 blade on 35 and 37EFI engines

Final gearing with these props is virtually identical !

The exception is MB who offers a host of modified engines and a variety of ratios

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