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Weight equalisation

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    Posted: 04 Jan 22 at 9:07pm
Very cleaver and professional, sounds like it had a lot of potential, what you were trying to do with the board makes sense. Maybe too much of a quantum leap in one package.


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Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jan 22 at 8:53pm
Great, now you have gone up in my estimation.
Here's my radical sail development which allowed the luff curve to be radically altered to vary the twist which actually worked, but the craft I tried to use it on which became knicknamed the Water Pusher, by my nephew who was an Olympic hope(less) at the time and ended up with me clinging to a buoy waiting to be rescued

The sail had constantly variable luff curve which enable me to go quite fast, it also allowed me to survive a 48 knots of wind run alongside Those big kids Dunkerbeck and Dave White, unfortunateely the 48 knot squall was a header so none of us went particularly fast, but the fact I got through carrying 2 sq mtr more sail than them proved my concept. (It was 7 sqmtr).

To adjust it you use the straps to induce more negative curve at the head and more more positive in the mid section with the mast already pre bent and a sleeve to covere the innards.







.

And here's the fateful water pusher that failed.

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Post Options Post Options   Quote tink Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jan 22 at 8:43pm
Originally posted by 423zero

A couple of years ago, I looked into using small retractable foils to aid in keeping boat flat, 0ne either side, leeward foil would provide lift, but only enough to keep boat flat, micro adjustments would be made by helm hiking, (actually would have been a perching boar), foils would be snug to hull when not in use.

Sounds very interesting, I know they are controlled by gyros but stabilisers on big ships are tiny. 
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Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jan 22 at 8:05pm
A couple of years ago, I looked into using small retractable foils to aid in keeping boat flat, 0ne either side, leeward foil would provide lift, but only enough to keep boat flat, micro adjustments would be made by helm hiking, (actually would have been a perching boar), foils would be snug to hull when not in use.
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Post Options Post Options   Quote tink Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jan 22 at 7:27pm
Originally posted by 423zero

Tink, interesting design, did you ever look at moving the smaller hull from side to side ? Like a boom, perhaps have a spring to lift it out of the water when you took your weight off it.

No, keeping the mast up with the stays it had to the end of the outrigger and weight steering was enough of a challenge. I didnít have any relevant qualifications at the time and in terms of actual performance it was an total failure. The whole venture was a lot of fun and led to other things so all good. Still wonít actually post a picture 
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Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jan 22 at 7:20pm
Tink, interesting design, did you ever look at moving the smaller hull from side to side ? Like a boom, perhaps have a spring to lift it out of the water when you took your weight off it.
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Post Options Post Options   Quote tink Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jan 22 at 7:04pm
Originally posted by iGRF

Originally posted by 423zero

Griff, what do you make of the 'dead downwind speed' thing? Thought you would be all over that.


If like me you joined the AYRS which I ran into during my eccentric speed week and revolutionary sail design period, in which I had to develop a sail to allow light weight me to take on heavyweight speed meat heads. You meet all those kind of guys, how to sail dead upwind, perpetual motion devices, although I must admit that device is genius in that it works. I love eccentrics that want to defy the alleged laws of physics, one day someone may find the means to travel faster than light, which I once proved to my physics master at school in theory at least only to be treated with as much derision as I receive here.

Honestly I don't fully understand a lot of what the informed guys have clearly postulated, nobody has adequately explained in a manner that convinces me for instance that a rack and wire achieve the same thing and that need to be disproved.

So this theory v mechanics thing aint over for me, there's something missing that I haven't completely grasped, even if you assume the weight transfer goes up the wire, then down the other side via the lee shroud, the leverage is still greater than that same weight being applied to a static rack which would scientifically explain at least why a trapeze is faster.

Fellow AYRS - this is me suspended from a trapeze in 87 Weymouth speed trials - the week of the big storm  

Wonít let me post a picture so hereís a link to my blog 





Edited by tink - 04 Jan 22 at 7:19pm
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Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jan 22 at 6:56pm
.double post.

Edited by iGRF - 04 Jan 22 at 7:10pm
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Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jan 22 at 6:52pm
Originally posted by 423zero

Griff, what do you make of the 'dead downwind speed' thing? Thought you would be all over that.


If like me you joined the AYRS which I ran into during my eccentric speed week and revolutionary sail design period, in which I had to develop a sail to allow light weight me to take on heavyweight speed meat heads. You meet all those kind of guys, how to sail dead upwind, perpetual motion devices, although I must admit that device is genius in that it works. I love eccentrics that want to defy the alleged laws of physics, one day someone may find the means to travel faster than light, which I once proved to my physics master at school in theory at least only to be treated with as much derision as I receive here.

Honestly I don't fully understand a lot of what the informed guys have clearly postulated, nobody has adequately explained in a manner that convinces me for instance that a rack and wire achieve the same thing and that need to be disproved.

So this theory v mechanics thing aint over for me, there's something missing that I haven't completely grasped, even if you assume the weight transfer goes up the wire, then down the other side via the lee shroud, the leverage is still greater than that same weight being applied to a static rack which might scientifically explain at least why a trapeze is faster.

Edited by iGRF - 04 Jan 22 at 7:12pm
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Post Options Post Options   Quote Mozzy Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jan 22 at 6:26pm
oFF, does tension in the wire increase when it's higher up the body? I would have thought it decreased as it will be supporting less of the weight of the sailor.

If the hook was exactly on the CoG and the sailor flat wiring then all the weight would be on the wire. But as that goes higher up the body more weight is supported by the feet.

If the hook is below the CoG then tension increases as the feet would have to push up on the gunwale to stop the sailors feet flipping above thier head. It would feel like hiking.

You could get almost an infinite amount of tension in the wire by attaching it closer and closer to your feet... if your body didn't give way first.

So going back to the tree analogy, you can either get more tension in the wire attaching it lower, but at a less effective angle or less tension at a more effective angle with a higher hook. Thus preserving the same resultant righting moment produced by the sailor no matter where they attach to the wire (we summed in addition to the force on the gunwal / rack).
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