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Old 28 September 2005, 07:56   #71
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Quote:
Originally Posted by hard1
But i think you may need the 450mm Interceptor based on weight/length?
Possibly it is boarder line.

What I canít decide is if I need two or not the only thing that worries me is my boat leaning and it always leans the same side Des
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Old 28 September 2005, 07:57   #72
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Originally Posted by Mark Halliday
Come on guys. You are not going to need that much pressure to actuate the blade. It is going up and down across the flow. The major resistive force is going to be the one trying to jam the blade in its guides and drag the whole shooting match off the transom.

err...........I think.
Quite right - very little force needed to actuate the thing!!!

You can fit 2 each side - they have the cabling to do it - no doubt you could fit more.

Amazes me the people who get so annoyed at splashing hulls don't seem to mind splashing other things.....

As I always have said - there is very little truly new out there - INCLUDING hull designs!!!

I also wonder why Volvo only say "up to 50mph" - I can't see that they won't work at 51mph!!! Maybe they lose effectiveness at higher speeds - or possibly even they become TOO effective!!!
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Old 28 September 2005, 08:01   #73
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Quote:
Originally Posted by Scary Des
Possibly it is boarder line.

What I canít decide is if I need two or not the only thing that worries me is my boat leaning and it always leans the same side Des
Er, if you don't have two or multiples thereof, you will be leaning/listing somewhat when you deploy it. You must mount 2.

Some hulls always lean into the wind when planing, and these wedges look to be a good way to correct this. Does the PAC22 naturally list at rest or is it an outdrive alignment issue?
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Old 28 September 2005, 08:08   #74
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Quote:
Originally Posted by codprawn
I also wonder why Volvo only say "up to 50mph" - I can't see that they won't work at 51mph!!! Maybe they lose effectiveness at higher speeds - or possibly even they become TOO effective!!!
perhaps at speeds above the 50 mph range the forces on them become too great and they can crack or break

probably the cost/strength/size/weight consideration
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Old 28 September 2005, 08:09   #75
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Quote:
Originally Posted by hard1
Er, if you don't have two or multiples thereof, you will be leaning/listing somewhat when you deploy it. You must mount 2.
Why If I fit one on the low side it will bring it level ie loose its list, or am I missing something
Quote:
Originally Posted by hard1
..... Does the PAC22 naturally list at rest or is it an outdrive alignment issue?
Level at rest it is a torque issue Des
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Old 28 September 2005, 08:15   #76
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Maybe above 50 mph the drag they create to do their job has got to the point were there is little (or maybe even -ve) overall benefit?

It would be interesting to see what happens to their 7m model at those sorts of speeds.

D...

P.S. Mine has the same torque issue. 50 mph however, is never likely to be one.........
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Old 28 September 2005, 08:24   #77
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Torque yay! Turbo 4! yay! Now I understand. Yes of course a single unit would work, but it seems a bit odd just to fit one. This kind of thing, of course, is why tabs were developed. to balance out torque, wind, load etc. and promote early planing. From studying the hull of my Fairey Huntress, they fitted a boarding step at the stern across the rudder which was supported at the base by an extension of the hull for a width of about 2' and a length of around 14". This extra length, it was claimed, added about 2 knots to the top speed by extending the planing surface which is why I believe tabs are probably better in the long run although much more expensive. The racing boys could tell us much more I'm quite sure! Wedges or Tabs???

WE NEED TO KNOW......
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Old 28 September 2005, 08:27   #78
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The problem with only sticking one on one side is that you will add another asymetric feature to your hull - which will probably behave differently at different speeds......... ...which could possibly be worse......
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Old 28 September 2005, 09:05   #79
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Quote:
Originally Posted by codprawn
Amazes me the people who get so annoyed at splashing hulls don't seem to mind splashing other things.....
Nah, its just inovative thought.
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Old 28 September 2005, 12:13   #80
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Quote:
Originally Posted by hard1
Some hulls always lean into the wind when planing, and these wedges look to be a good way to correct this. Does the PAC22 naturally list at rest or is it an outdrive alignment issue?
Mine leans into a strong cross wind as most boats seem to, but not at rest or when its calm. Des, wonder if its that gearbox ratio and large SMC 807 prop? You could do with having it measured.

Pete
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