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Old 21 May 2009, 17:27   #11
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Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,692
Originally Posted by javelin View Post
OK sealed up it is then.

Took her out for a first test tonight.
She gets on the plane but she takes her time and I guess this could be the prop as the current single engine was, until our a conversion, one of a pair.

So, and I guess you can tell there's a noob about,
5.6 searider.
Used on the sea.
Single 55hp Evin "commercial" two stroke,

what prop should I be using?
Where do I get one?
I hear it should be alloy so we dont strip the gearbox when the driver gets a line wrapped up.


What prop is on there now?
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Old 22 May 2009, 01:02   #12
Country: UK - Scotland
Town: fife
Make: Humber / searider
Length: 5m +
MMSI: ... - - - ...
Join Date: Sep 2005
Posts: 720
Untimely you would be looking for (said in a Clarkson style) more power.

However I would block up the holes first and see how it goes. You might be surprised. I had a 5.4 with a old yam 60 on it and it was ok with 2 on board, with 3 it was still managing to plain ok and it had a flooding hull. I have read that there is about 400kg (it will go out the back quite quick but it is still there) of water in a 5.4 hull at rest so I would guess on a low powered set up this could make a huge difference.

And remember blocking the holes up is very cheap and easy to reverse. If you think about how you are to go about it.

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Old 22 May 2009, 17:13   #13
Country: UK - England
Town: Southwold
Make: Avon
Length: 5m +
Engine: 2x55hp Evin pet
Join Date: Apr 2009
Posts: 20
The issue with more power is with the mixed ability of the people who will be opperating the rib.
Which is afterall why we converted from twinn 55s to the single.

Yes a 70 fourstroke would be ideal but we're a small sailing club and finance like that is not easy to come by.

Blocked up the holes today and fitted a bilge pump.
Fitted the vhf and checked the regulator and the charging system.
Messed around with the cable adjustment for ages trying to get neutral, reverse/forward in the correct place and think I got there in the end.
Went for a blast down the coast and all seemed fine.
On the sea she felt far better than she felt on the high speed section of river.
Hand held GPS says 24knts compared to the twin setup which we saw 36knts.
So in terms of speed and the sort of use she'll have I think performance is about right.

That said, I think that the engine might need flattening out a little as she tends to go nose high and at around 4-6knts she throws out a big wash.
I think that she'd benefit from a finer prop especially when we have to tow dingies in and out of the harbour.
However like a fool I forgot to check what prop we have - I'll do that tomorrow.

Thanks for all the help thus far.

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