Thread subject: Whaler Central - Boston Whaler Boat Information and Photos :: 1982 17' Montauk w/ Yamaha F70 -SS Prop?

Posted by tedious on 09/21/18 - 5:49 AM
#11

Sorry you're not getting better performance with the new prop, but every boat is different. To make sure you have a good baseline, take the boat out on flat water with a minimum load (just you) and do a top speed run - full throttle and then trim up to where you feel the boat performs best. The SCD-3 is a stern-lifting prop, not designed to lift the bow much, so you won't want to trim up radically as it won't help. Just trim up a little until you get what seems to be top speed. You should feel the boat really start to accelerate as you start to trim up.

I'm hoping you get up to around 6000 RPM and 35 MPH at least. If you don't, you may want to consider dropping down some more in pitch, but get that baseline first. I see the poster above ended up with a 14-pitch.

I'll be happy to buy that 16-pitch back - I have not had too much chance to experiment with the 17 that replaced it, but there were a lot of things I liked about the 16 so I'd be glad to have it as a spare.

Tim