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Old 12 April 2005, 15:58   #11
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Originally Posted by codprawn
Couldn't agree more - it just goes to show prop choice is something of a black art as there are so many variables - also the way you use the boat also has a big impact.
Could also agree, don't know about bigger RIBs but I use two different pitches of prop depending on load carried.

Andy
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Old 12 April 2005, 16:57   #12
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Quote:
Originally Posted by codprawn
Couldn't agree more - it just goes to show prop choice is something of a black art as there are so many variables - also the way you use the boat also has a big impact.
Not in this case, they just got it wrong. Mike C new better and he should have relied on his own knowledge. Increase of 400-500revs required. Rule of thumb 200rpm/1" pitch change. Therefore, 23" down to 20"/21"... fine but Mike said Steel Developments recommended increasing the size of the prop. This is obviously going to drop the revs. Doh.
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Old 12 April 2005, 17:04   #13
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I'd tell Steel developments that I wanted my money back and go prop borrowing, then after all that borrowing I'd take a look at ebay as there seems to be plenty of bargain props on there!
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Old 12 April 2005, 17:12   #14
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Thanks for the replies...

Searider...
Thanks for the offer. The theory is that for the Vengeance, I really need a 21"... but I may well take you up on it just to see! As you have a petrol o/b, then yes, the Laser probably will be better. It MAY be different with my diesel!

Richard B....
Thank for your offer.... Trust you to buy a Yam! Still thatís more Alan's fault really... and he's in the colonies! I have big hammer... Maybe if we hit it hard enough it will fit? I will answer your PM re the Solas and your previous problems

Louise...
Well I could go down that road but I do still want a new prop. To be fair, Steel Dev did offer to change it for another without any prompting.... and as we have said, props are a black art. Even with a re-fund, I'm still in the same position.... unless I can find a company that will do an exchange system! That would be the ideal and I'd happily pay a bit more for that facility.

Codprawn & Hightower...
The performance I quoted earlier is fairly heavily laden. With one person on board and only a little fuel the 23" ali is reasonable. Heavily laden, I would be happy with another 200-300 revs... which would be about 200 below what WOT should be. Overall though I need a lower pitch.

Mike C
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Old 12 April 2005, 17:15   #15
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Err, bottle of Port says Richards Yam prop will fit but might need a spacer to adjust the distance to the hub.

Pete
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Old 12 April 2005, 17:18   #16
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....JWalker...

Not exactly.... I dropped PITCH size to 21" but the increase was in DIAMETER. This would seem to counteract the pitch drop to produce something that gives about the same WOT revs as my ali. Thatís why they suggested dropping another 2" in pitch for the Titan. The theory is OK.... Its the practice that worries me! I may well end up getting a Laser II if Andre's works well on my boat just because I will then be sure what it does... even though the Vengeance or 19" Titan may actually have been better.... But I can't find out!
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Old 12 April 2005, 17:19   #17
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Quote:
Originally Posted by Pete7
Err, bottle of Port says Richards Yam prop will fit but might need a spacer to adjust the distance to the hub.

Pete
Sounds like the start of a prop swop shop!
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Old 12 April 2005, 17:21   #18
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Richard....

Whatya doin on the weekend of the 23 & 24th April?
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Old 12 April 2005, 17:25   #19
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Originally Posted by Richard B
Sounds like the start of a prop swop shop!
Andres boat can't be that different to the Humber, but I would get me hands on every prop available and spend an afternoon testing. In fact it would make quite a good article on the effects of different props on a boat.

Rogue Wave might have a Laser 21 too thinking about it.

Pete
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Old 12 April 2005, 17:29   #20
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Quote:
Originally Posted by Mike C
I may well end up getting a Laser II... even though the Vengeance or 19" Titan may actually have been better....
I've never read anything on RIBnet or anywhere else to suggest that either a Vengeance or a Titan would perform any better than a Laser II.
Quote:
Whatya doin on the weekend of the 23 & 24th April?
Swoppin' props?

P'raps a bit cheeky, but I wonder if we could persuade Duncan (Searider) to come along with a Vengeance or Laser II to compare to the Solas? All we would need now is a supply of spacers... Pete - IIRC you once mentioned that Lee Fairweather keeps them in stock? If so I might be able to pick some up one lunchtime.
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