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Prop Size and Pitch

The Captain

Total Posts: 20
Joined: February 13, 2015

Question: Hope you can help me with a prop (wheel) question. I have a ’63 Chris Craft Roamer, Custom Comet with twin 283H’s. According to the original invoice, this boat came with 3639 and 3638 wheels. What is the size and pitch for that numbered prop? I’ve got 13/10’s on there and they seem like they spin too much.

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Posted on February 13, 2015 at 6:08 PM
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The Captain

Total Posts: 20
Joined: February 13, 2015

Re: Prop Size and Pitch

Answer: OK, the propeller should be tuned to the engine, allowing the engine RPM to be in the proper operating range at Wide Open Throttle. A gear reduction transmission changes this ratio, while lowering the RPM for reduces fuel use. Could you give me the HP (should be 185) Max RPM (should be 4400) gear reduction (on transmission tag) and the speed you would like to cruise. Your 13/10’s are small, a better prop for best efficiency and performance will come from this design information. We may be able to use a 4 blade for reduced vibration or the standard 3 blade may work just as well.

Posted on February 13, 2015 at 6:08 PM