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Old 11 November 2003, 18:38   #21
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Re: Re: Sound Advice

Quote:
Originally posted by Dirk Diggler


Hope I can be of more help in the future
You can help me by telling where I can get Big thrust bearings from (for the Cat)

cheers
Stuart
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Old 12 November 2003, 03:43   #22
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Not entirely sure what you mean by "thrust bearing", please clarify. Doesn't the motor have a drive plate? Big dinner plate size thing with rubber centre, or possibly loads of springs?
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Old 12 November 2003, 05:19   #23
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For Mosser

Hi Mosser

if you're having trouble getting on the plane have you considered putting fins (doelfins?) on the engine. They are supposed to make a big difference to getting the boat to shift, and are cheap to buy.

2 Threads on ribnet in the past are:

http://rib.net/forum/showthread.php?...highlight=doel

http://rib.net/forum/showthread.php?...highlight=doel

where this was discussed a fair bit earlier this year.

hope this helps

Ricky
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Old 12 November 2003, 05:32   #24
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A propeller does not work like a wing on an aircraft it does not give lift it gives forward thrust. A thinner blade section is always going to be more efficient than a fatter thick one, this applies to both slow and fast speed craft. The explanation is simple, if the blade enters the water with less resistance as in the case of a thin blade section there is less drag therefore it is more efficient.

Julie
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Old 12 November 2003, 05:32   #25
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Thanks Ricky,

I'll look into those threads.
All I can say is that divers are a heavy bunch (or maybe it's just the ones over here!).
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Old 12 November 2003, 05:39   #26
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Quote:
Originally posted by Dirk Diggler
Not entirely sure what you mean by "thrust bearing", please clarify. Doesn't the motor have a drive plate? Big dinner plate size thing with rubber centre, or possibly loads of springs?
that's the fella, I think it might be more appropriately called a power transfer plate, It's a big steel soup bowl, with a rubber insert which is about 10 inches in diameter this is made of Rubber and has what appears to be spring steel inside the rubber
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Old 12 November 2003, 05:48   #27
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Doel Fin

Mosser

Yes a DoelFin should help your problem. There are several brands of hydrofoil on the market but only one "DoelFin". You need to be careful in selecting the best one. The original Doel Fin gives stern lift to get the boat on the plane but with minimal drag, you do not want to reduce your top end speed. It is best to compare the original Doel Fin to a "copy" so you can see the difference. As a company we have tested many brands of hydrofoil and the best one in our opinion is the DoelFin. They are currently on the market for 38.00+VAT but if you are not waiting for one if would wait until the boat show so you can compare the difference brands plus we usually offer them at special boat show price

Julie
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Old 12 November 2003, 05:59   #28
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Divers

Quote:
All I can say is that divers are a heavy bunch (or maybe it's just the ones over here!).
Mosser - they're heavy over here as well (at least some of them are...)

Ricky
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Old 12 November 2003, 06:24   #29
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Quote:
Originally posted by Steel Dev
A propeller does not work like a wing on an aircraft............. it does not give lift it gives forward thrust. Julie
1) Oh yes it does. It is an aerofoil flying on its side.

2) Oh no it doesn't. A jet gives thrust.
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Old 12 November 2003, 07:35   #30
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JW

JW

Do you have a boat or a plane?

I assume that your prop is fat and thick to go faster? This will not work. Propellers work in the water not the air. If you think a thick blade section will go faster explain why racing boats which want to go as fast as possible to win use props with very thin blade sections? In fact they buy a new propeller and then have the blades lab finished and the blade section thinned it to make it go faster!

Julie
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