C17

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TomW1
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Re: C17

Post by TomW1 » Tue Apr 10, 2018 10:59 pm

I just happened to have the Yamaha web site up when I saw your question. There is around a 100lbs difference in weight as well as the extra HP. I think 75 maybe to much I would have to run some calculations to check what top speed would be. If it would still be in the 40's you would be okay. You would probably need trim tabs to handle any porpoising or excess bow lift. It will be Friday till I can run any calculations. If you can find what the top speed was on his boat it would help.

Tom


Restored Mirror Dinghy, Bought OD18 built by CL, Westlawn School of Yacht Design courses. LT US Navy 1970-1978

stevehewins
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Re: C17

Post by stevehewins » Wed Apr 11, 2018 3:24 pm

Hi Tom, thanks for your reply! I have found a marine engineers who have a couple of mariner/mercury 60hp engine's. One in pretty good condition which I think I'll end up going. Not massively heavier than a 50 either. I wouldn't worry about the calculations for the 75hp. Although I really appreciate the help!

TomW1
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Re: C17

Post by TomW1 » Fri Apr 13, 2018 3:21 pm

The 60 will be a nice motor for the C17. Enjoy your build and post pictures as you go along.

Tom
Restored Mirror Dinghy, Bought OD18 built by CL, Westlawn School of Yacht Design courses. LT US Navy 1970-1978

fallguy1000
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Re: C17

Post by fallguy1000 » Sat Apr 14, 2018 12:41 pm

Make sure and take a look at the Yamaha F70.
My boat build is here -------->

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Capt UB
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Re: C17

Post by Capt UB » Thu Apr 19, 2018 12:19 pm

Sell the 135 for a used 50-60 two stroke!!
FS14 (SandPiper) launched 10/20/2018

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