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Ouch - hope you (and the previous owner) did not damage the motor lugging it like that. Assuming it's OK, I can personally vouch for Phil's 3rd option, the Power Tech SCD3 in 13x16. I run one one my F70 on a 15, and it works great but is also significantly underpropped on my smaller boat - I hit the rev limiter (6450 RPM) when running flat out and light. I would think the 16 would work perfectly on a Montauk.

From my experiments the F70 runs best with a low rake prop with small blade area - the SCD3 was the 4th prop I tried and it was dramatically better than all the others. I went all the way down to a 13 pitch in a prop with more blade area and it still didn't have the acceleration of the SCD3 in 16 pitch.

I have been thinking of going to a 17 or 18 pitch, so if you are potentially interested in buying my 16, let me know. I see you are located in Massachusetts, as am I, so I would be happy to let you try before you buy.

Tim