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Outboard & Sterndrive Questions and Advice

Old 07-29-2019, 07:31 PM
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Question Outboard & Sterndrive Questions and Advice

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Outboard & Sterndrive Questions
Old 01-22-2020, 10:46 AM
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25’ Bertram twin 165 mercrusiers, alpha 1 ratio 1:65
wot port-3950 rpms ( counter rotating)
Starboard-4110 rpms
max speed is 28knots
Aluminun 4 blade 15x16

looking to maybe go stainless. I’m looking for cruising speed and fuel consumption. I don’t need top end speed. What would you recommend? 3 blade or 4 blade would work. Thankyou
Old 01-22-2020, 11:25 AM
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Hello surfgod82

Probably it will be a good idea to try a Mercury Mirage Plus 15 3/4 x 15. I have tried these in very similar set ups, with good results. If still interested in a 4 blade option, the Powertech OFS4R 15 or 16 would be a good start.

You are free to call if you have further questions...
Old 01-22-2020, 03:58 PM
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Thanks for getting back to me. Before I put the counter rotation on I was running aluminum black diamond 3 blade 14.5x17, wouldn’t the 15 3/4x15 prop you recommend be too small?
Old 01-23-2020, 05:20 AM
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Hello Surfgod82

The Diameter of the propeller will make a big difference carrying the weight and cutting slip. We have both sets in stock as demo propellers, 15 3/4 x 15 and 15 1/2 x 17. You can try them both ans decide which one is better.

Please forward any questions!
Old 01-23-2020, 06:52 AM
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Thanks for the help, I’m in NEW YORK so I’m on blocks right now . I’ll contact you again in a few months when I’m closer to launching.
Old 01-23-2020, 07:01 AM
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No problem

Looking forward to help you!

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