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V Twin

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oldarn View Drop Down
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Post Options Post Options   Quote oldarn Quote  Post ReplyReply Direct Link To This Post Topic: V Twin
    Posted: 26 Apr 12 at 11:20am
Graeme, surely with all this advice it is time to get back to basics which I see as this:-.
1  Do you honestly believe, leaving capsises out of it, that it is likely to achieve the performance expectations  you require? Only you know the answer to that. So assuming you can see the performance you require is within reach, then where next.
2  I assume by the design that capsizing was intended to be rare, but if, or rather when, it did happen, you should be able to right it, other than in the most unforeseen circumstances.  Now, I suggest, forget solving the total inversion route and concentrate on preventing inversion. IMO, only if solving the latter is not possible is the project doomed.
3 Accept that you could get separated and the craft blow away.  Either take the risk that this will not happen and if it does, tough, or go for ,was it 'rogue's solution. Tie the mainsheet to harness.

You now have to solve just two things. 1 preventing inversion, and 2 minimising the likelihood  of capsizing. In the case of 1, there have been many suggestions, and in the case of 2, perhaps follow a similar logic path that, as previously outlined, we followed when developing the AltO, and I guess you have an opinion on as to how successful that process proved to be. 
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rogue View Drop Down
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Post Options Post Options   Quote rogue Quote  Post ReplyReply Direct Link To This Post Posted: 26 Apr 12 at 12:25pm
'tie the mainsheet to the harness'

Yep, I posted it.  It's what I did in the MPS to have access to the mainsheet whilst holding the kite sheet from the wire.  It's by no means and original idea and AFAIK, it's a practice relative newbies to the boat do, as the more experience you get with the boat, the more happy you are to take both sheets onto the wire in the first place.

Would I want to go it in a more powerful craft, on the sea... well I guess that depends on circumstances.  

If there's local rescue cover then probably not, in the event of serious rescue, sod the boat, they can pull me out without the risks of me being dragged off with the boat or having the b**tard sheet pinned around my ankle without a free end to get hold of and untie myself.

If there isn't club rescue cover then I guess in the event of coastguard/RNLI rescue being with the boat would make me easier to spot, especialy given both Graeme's and my aversion to naff, brightly coloured sailing apparel, so the risk is worth it.  

We should never forget the inherent risks we all take when sailing, especially if we do it in an unproven, 'theoretical' craft which may well have been homebuilt/finished without a properly qualified design or Quality Management System in place.  At the very least, if your loved ones can get your body back, well that gives them some chance of finding peace with the decisions you've taken.

Sorry if that's a tad sombre for the usually jovial V-Twin thread, but it's the reality we face every time we go sailing and some recent aggressive correspondence over my own sailing experiences has made this a very salient point of late.


Edited by rogue - 26 Apr 12 at 12:31pm

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Post Options Post Options   Quote tickler Quote  Post ReplyReply Direct Link To This Post Posted: 26 Apr 12 at 1:03pm
Dinghy sailing will always be a hazardous affair.  The concept of a wobbly human being balancing a boat against inconsistent forces of wind while it slops up and down on waves is a silly way of getting from A to B. Hanging an anvil underneath seems a good way of encouraging stability but most dinghy sailors reject that idea because it is slow and cumbersome. We are stuck with it. Dinghies fall over. Mr Fuller made a valliant effort to produce a boat that showed a reluctance to fall over but those very charachteristics, working in reverse, seem to be its major flaw. If I was sailing it I would be reluctant to exploit its performance potential because I would be terrified of the consequences.

I am sick of trying to get my little Byte back up and because of slight health worries I have decided to stop doing it. I intend to tie a line from the mast head which will clip onto the bow eye. I will climb into the rescue rib, reach into the water, detach the line and pull the mast up. The rib can then tow the boat into shallow water  where I can right the boat with my feet on the bottom........or just abandon it and send the boy out......or buy a Solo.

I think that unless GRF finds a solution to this dilema he will never enjoy the promised performance of the machine.
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Post Options Post Options   Quote x1testpilot Quote  Post ReplyReply Direct Link To This Post Posted: 26 Apr 12 at 1:04pm
Sorry to hear all your troubles with righting. I think it is a really difficult problem. I have thought of lots of useless ideas! I do hope you (or someone) can solve them.

I would recommend a sealed mast with external halyards (we have semi sealed - still a hole at the base), though I think this is not enough for a complete solution.
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Post Options Post Options   Quote Lukepiewalker Quote  Post ReplyReply Direct Link To This Post Posted: 26 Apr 12 at 2:04pm
Hurricane 500 had a big pole which swung out from underneath for righting. Not sure how you would attach and stow that on the V-Twin though.
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Post Options Post Options   Quote oldarn Quote  Post ReplyReply Direct Link To This Post Posted: 26 Apr 12 at 2:10pm
Originally posted by rogue

'tie the mainsheet to the harness'

Would I want to go it in a more powerful craft, on the sea... well I guess that depends on circumstances.  

If there's local rescue cover then probably not, in the event of serious rescue, sod the boat, they can pull me out without the risks of me being dragged off with the boat or having the b**tard sheet pinned around my ankle without a free end to get hold of and untie myself.

If there isn't club rescue cover then I guess in the event of coastguard/RNLI rescue being with the boat would make me easier to spot, especialy given both Graeme's and my aversion to naff, brightly coloured sailing apparel, so the risk is worth it.  



Do you mean more powerful than an MPS?

I'm not sure what Graeme wants to achieve speed wise.I assume similar, but without all that capsising stuff and why not at that sort of speed on the sea when relying on local cover. It is exactly the thrill of speed in waves in a up to a force 6 that for me is what dinghy racing on the sea should be about, but again for me certainly not single handed and yes, reasonably safely. I know Graeme would prefer to be out there with his great crew and friend, who we have sadly lost, enjoying the challenge together. Two handed non skiff boats are relatively safe since there is always the other person if one is in trouble, and even if inverted, if of sensible design, it should be recoverable.
 
To try and achieve this experience on the sea, in wind, in a single handed craft, why not, but at 60 kg some compromising will have to be done. Reduce sail area slightly, reduce buoyancy, do away with double bottom, or at least, as already suggested make in semi double bottomed and of course accept  a partially filled cockpit after capsise cleared quickly with bailers. Accept about four capsises a season, perhaps two of which might require assistance in righting from club rescue but all this assumes you take measures to make it 95% proof against inverting.

Achievable without any major changes to concept.
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Post Options Post Options   Quote Do Different Quote  Post ReplyReply Direct Link To This Post Posted: 26 Apr 12 at 2:14pm
As GRF has seen the performance he hoped for albeit briefly. I would expect a man of his independent spirit to cock a snoot at those detractors still on the shore, lash half a dozen milk bottle containers to the hounds and take every opportunity to refine the sailing systems and his technique. Had I got as far I would certainly would take that approach for now.

Complicated righting systems are a distraction from an inherent design problem as it stands. Surely with some careful consideration of the cross section the volume of the form can be reduced in the right places  to allow it to float lower. This would reduce the inclination to invert in the first instance and allow it ROTATE around it's biggest volume when attempting to right it. Unless a fair percentage of the hull sinks only extreme amounts of leverage will ever lift the opposite side clear of the water. Ref. Oldarn, 505s have big side tanks, the Alto doesn't.   
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Post Options Post Options   Quote rogue Quote  Post ReplyReply Direct Link To This Post Posted: 26 Apr 12 at 2:23pm
Hi Oldarn, yes I meant more powerful in terms of inverted stability/non-compliance as opposed to raw power from a sailing perspective.

That's a lot of boat to manhandle... 

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Post Options Post Options   Quote G.R.F. Quote  Post ReplyReply Direct Link To This Post Posted: 26 Apr 12 at 3:29pm
Originally posted by Do Different

As GRF has seen the performance he hoped for albeit briefly. I would expect a man of his independent spirit to cock a snoot at those detractors still on the shore, lash half a dozen of them to the hounds and take every opportunity to refine the sailing systems and his technique. 

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Post Options Post Options   Quote oldarn Quote  Post ReplyReply Direct Link To This Post Posted: 26 Apr 12 at 3:53pm
Originally posted by Do Different

As GRF has seen the performance he hoped for albeit briefly. I would expect a man of his independent spirit to cock a snoot at those detractors still on the shore, lash half a dozen milk bottle containers to the hounds and take every opportunity to refine the sailing systems and his technique. Had I got as far I would certainly would take that approach for now.


Well said.
Over the nearly ten years or so since I started playing with what became the Alto (wasn't planned), I have been amused rather than put off by the many doubters with their suspect comment. 'Swinging the pole not necessary because asymmetrics only use apparent wind', and so swinging pole unnecessary! Interesting that all boats sold except one into BCYC,are into estuaries or, as Graeme, on the sea where there are these strange things called currents, or do I mean 'apparent currents' Perhaps it is the apparent currents which make the swinging pole so desirable. As for non-doubled bottomed boats, 'apparently' they went out with the Titanic or do I mean  the Ark. They are dangerous since they won't turn turtle.
Two new boats have sold since the Boat Show into an estuary that has as well as apparent wind and apparent currents, a phenomena known as 'apparent waves'. Clearly the new owners realised they needed a non 'Garda Class' that can handle such dangerous conditions. 
Since the Dinghy Show two new AltOs have sold and like all other  AltOs, to be sailed, yes in waves! Oh dear and it only has a single bottom. 
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