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Old 12 June 2006, 18:17   #11
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novice shining through

thanks for that never heard of them do you know anyone who has tried/uses them?i will try to get out on my own the recommended top end rev range is 5000/5600, so i am right at the bottom of the scale and as i only have a handheld gps,and the boats speedo is cra! i have not used it a lot to test speed so i will be do a few more tests i assume most people talk speed over land in these forums?
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Old 12 June 2006, 18:20   #12
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Noddy's got one- he seems to think it's ok.


I guess it's a cheap way of finding out what pitch you need?


It's kinda a mixture of MPH and Knots on here, depending on what system people are using.

If it's any help 1 knot = 1.15078030303 mph
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Old 14 June 2006, 04:45   #13
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The number is 48 816702A40 12P which I presume is a 12" prop does it sound a bit small?

Thx Marcus
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Old 14 June 2006, 06:47   #14
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Quote:
Originally Posted by Marcus@globalpl
The number is 48 816702A40 12P which I presume is a 12" prop does it sound a bit small?

Thx Marcus
yes.
My 4m Avon with 40HP 2stroke ran a 13" ally prop and that used to scream, accelerated like a Enzo, although the top end was alittle dissappointing, really needed a 14" or a 15".
My current boat has a 70HP Tohatsu and a 17"prop, we tried several props and this one is the best match of acceleration and topend and at WOT sits nicely in the middle of the prescribed max rpm range.
I would try and borrow a 14" prop and see how you get on.
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Old 14 June 2006, 09:24   #15
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Thx ADS.... Im going to try out a 15 pitch will let you know how I get on. Got loads of advice from Steve at Barrus...top geezer!
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Old 27 June 2006, 06:54   #16
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New Prop

Hi

Put a 10.125 / 15" prop on.
Now cruises at 23kts (GPS) against 18 before.
Top end up to 32 from 29/30.

Engine hits max of 5600 rpm....so I think ive got the right one!
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