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Old 28 September 2005, 04:16   #51
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If it says that they are effective up to 50mph, has anyone any idea what they would be like on a 60 - 70 mph stepped hull RIB? Thought about fitting trim tabs to the race boat, but they are heavy and bulky - these seem neater and more compact - maybe lighter as well?
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Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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Old 28 September 2005, 04:39   #52
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The fact that they work fast might be interesting for racing

I was thinking about splashing the idea and designing my own

My boat always leans to the right almost regardless of wind, wave etc so one 'virtual wedge' might be the answer it could be manually operated with a lever Des
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Old 28 September 2005, 04:56   #53
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Des now your talking, manually operated with a normal 33c cable, we just need a look at the volvo design and then have a small engineering firm make one up.

In fact make half a dozen in S/S or Ali and sell the rest. One of those nice billet control boxes for the control ends.

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Old 28 September 2005, 05:03   #54
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... One of those nice billet control boxes for the control ends.....Pete
Hadnít thought about cable operation but a good idea

What do you mean by a billet thingy Des
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Old 28 September 2005, 05:15   #55
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The cable idea would mean that you have the ability to adjust them, so one could be fractionally lower than the other to correct your slight list to port. It would also be instant, grab a handfull of lever and the tabs are up or down.

The race lads have nice machined control boxes for throttles and gearbox controls and look very sexy. Cookee will know what I mean. Graduations would show how much trim tab is below the boat or when they are fully clear.

Picture isn't quite what I had in mind, but gives an idea.

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Old 28 September 2005, 05:34   #56
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Aaah neat idea

I was thinking of something very simple that looked a bit like a slues (?) gate threaded bar with a handle on the top for up and down. Des
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Old 28 September 2005, 05:49   #57
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Hmm, just thought, water pressure going to be quite high and would push against cables. Not sure if it would work with cables in compression as tabs might move up. Think the water pressure is about 80 lbs sq inch (unless anyone knows differently). Multiply by the area of the exposed tab is alot of pressure, afterall you can ski barefoot at 20 knots, thats an adults weight supported by a very small footprint.

Fancy going halves:

http://cgi.ebay.co.uk/Teleflex-Morse...QQcmdZViewItem

Slues gate ? is that like a vice ?
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Old 28 September 2005, 05:55   #58
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Hmm, just thought, water pressure going to be quite high and would push against cables.
Stick a fulcrum in, so pushing - pulls and pulling - pushes.

[Edit] It will also multiply the force on and reduce the movement of the tab for the much larger lever movement. Super fine control.
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Old 28 September 2005, 06:01   #59
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Possibly, but still think the water pressure might over come the friction of the cable and lever. However that would mean they automtically raise at a given pressure, say planning speed.

Is there a draughtsman in the house to draw one. Could be a very lucrative contract asuming the the tall one only takes a small cut for using his forum for biz
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Old 28 September 2005, 06:04   #60
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Is there a draughtsman in the house to draw one. Could be a very lucrative contract
Yep, and he dont seem to want to do what he is ment to be doing at the mo.
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