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Old 26 May 2010, 07:31   #11
chewy's Avatar
Country: UK - England
Town: Up Norf
Make: Avon SR4,Tremlett 23
Length: 4m +
Engine: Yam 55, Volvo 200
Join Date: Apr 2007
Posts: 5,217
From what has been said it does sound like the bush has had it.

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Old 26 May 2010, 07:33   #12
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,614
If it's a large SIB, is the keel properly inflated (and holding air)?

if not the rear few inches could be acting as a good downwards deflector for the passing water as the dynamic pressure builds and forces the "hull" into a concave shape.

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Old 26 May 2010, 07:50   #13
Country: UK - N Ireland
Town: Bangor,Co Down
Make: Gemini/ Avon
Length: 4m +
Join Date: Jul 2003
Posts: 166
Does it stay in the water for long periods of time?....if so any slime build-up on the hull will kill performance.
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Old 26 May 2010, 10:06   #14
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
Originally Posted by Dan Worth View Post
we don't have any local dealers, and the local boatyard wouldn't lend any props (helpful)....
Not that unusual. Most businesses shy away from having a bunch of loaner inventory on hand, even if it does help in the decision making process of purchasing.

I know I have no shops nearby which do loaner props for testing. Wish I did though.

General consensus here is that the prop as detailed should be okay?
I think the general consensus was that you can't really tell until a) the prop works as it's supposed to, and b) you get an rpm reading.

But it does sound to me like it should be close, at least.

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Old 29 May 2010, 08:49   #15
phillnjack's Avatar
Country: UK - England
Town: slough
Boat name: not named yet
Make: Orkney Dory 4 metre
Length: 4m +
Engine: outboard evinrude 60
Join Date: Sep 2009
Posts: 80
if it has launching wheels are they pulled back up into the boat ?

stupid question, but ive done it so i bet others have too !

I have 30hp suzuki on s400 and getting 26 mph no problem with 10 inch pitch prop.

i need a bigger prop to stop engine over revving, so a prop like their one should blast the boat onto the plane.

from standstill i have to hold on real hard to stop myself being launched out the back of the boat.

5 to 6 knotts is real y crazy speed for this type of boat.

maybe they dont have a inflatable keel to get it up ?


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