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Old 13 July 2013, 05:40   #1
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Country: UK - England
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Yamaha F70 - Looking at props

I have a Zodiac Medline 500 with a Yamaha F70 4 Stroke, it has the standard white Yamaha prop on it. At WOT around 6100 RPM I tend to get around 29 Knts give or take a few depending on the load on board.
Had the boat for over a year now and I am now wondering how much more speed It could do with a different prop, I have no idea how the different types of props affect the speed and performance so if anyone could help it would be greatly appreciated.
I have found the Performance Bulletin for my boat and it shows a top speed of 39 MPH, Is the prop used there the standard or a different one?
Thanks for any help
Ralphy
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Old 13 July 2013, 09:20   #2
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we need to know what prop pitch is on there, almost def you could go up a pitch or two, i would expect to see 35 knots approx at 6100 rpm
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Old 13 July 2013, 09:44   #3
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Only you know whats fitted to your engine. Propellers | Yamaha Outboards
The test was with a 13-1/4 x 17
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Old 13 July 2013, 13:47   #4
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I'll go down to the boat tomorrow and find out which prop it is exactly
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Old 14 July 2013, 13:03   #5
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I had a look today, It said 13 1/2 - 15 - K.
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