Vantage475T

Members
  • Content count

    43
  • Joined

  • Last visited

Community Reputation

0 Neutral

About Vantage475T

  • Rank
    Newbie

Contact Methods

  • Website URL
    http://www.smalltrimaran.co.uk

Profile Information

  • Location
    Lymington, UK

Recent Profile Visitors

327 profile views
  1. Vantage475T

    Sailing anywhere between Perpignan and Montpelier

    thanks everyone, hopefully we'll find something and be able to takea advantage of the warm flat water while we are out there!
  2. Vantage475T

    Sailing anywhere between Perpignan and Montpelier

    thanks very much - that is helpful. we'll ask the airbnb guys we're using as well. just hoping to get on the water where it is vaguely warm and flat....
  3. Hi, We're heading over to the South West France - but Med side not Atlantic - at end of this month and we've never been in this area before. Has anyone done any dinghy or small cat sailing around there? Anyone know anywhere we could hire small dinghies/cats? We currently sail a Spitfire cat with my wife but we also happily sail usual small holiday hire dinghies and would be nice if we can find some. We only technically have RYA 1 so that might cause a problem for some renters although we hired a Laser 2000 with no problem in Menorca last year which was lovely. We're looking down their potentially for the longer term to retire and have small boat sailing nearby. Any thoughts or advice gratefully received.
  4. We're heading over to the South West France - but Med side not Atlantic - at end of this month and we've never been in this area before. Has anyone done any dinghy or small cat sailing around there? Anyone know anywhere we could hire small dinghies/cats? We currently sail a Spitfire cat with my wife but we also happily sail usual small holiday hire dinghies and would be nice if we can find some. We only technically have RYA 1 so that might cause a problem for some renters although we hired a Laser 2000 with no problem in Menorca last year which was lovely. We're looking down their potentially for the longer term to retire and have small boat sailing nearby. Any thoughts or advice gratefully received.
  5. Vantage475T

    Homemade small tri

    That is cracking. Have you got any video in larger chop and swell? I'm based out of Lymington in the Solent and we get some sizeable water around here. I'm looking at something similar and wonder how it would cope in the non-flat water. Love it.
  6. Vantage475T

    Small tri beams

    thats really interesting to see. Have you got any more vids of your boat? I've seen your flickr page where that image is located - looks a laugh and saw you have a couple of vids on youtube that I hadn't seen before. thanks for sharing that.
  7. Vantage475T

    Small tri beams

    Thanks for the link that has some interesting pictures of the folding mechanism which seems otherwise quite difficult to find. Yes I am aware that this is far from a new idea, I am just trying to apply it to my own botched up boat for my own specific requirements. I want to recreate the wheel in as there isn't anything out there that does it for me as far as I can see.
  8. Vantage475T

    Small tri beams

    Just had half an hour to test a jury rigged folding mechanism on the bench with heavy 45*120 lumber as the beam. I've approximated the hull mounted bracket location and the beam used is the intended 1.9m and I've taped on an approximation of the largest section of the float. That is the arse end of the Sport Tandem trimaran main hull above my head. In the real iteration of the new project, the beams will be canted up around 5 degrees so I can raise the beams above the water a little but it at least gives an idea that it will work ok. I am planning on making the brackets and folding cantilever beams from stainless steel and then having two quick release clamps over each beam to spread the load when under pressure. Using this sort of scheme does anyone think I need to go as big as 100mm on the beams or reverting back to my 70mm beams would likely be sufficient?
  9. Vantage475T

    Small tri beams

    thanks wayne and rasputin. I will proceed with the 100mm thin wall ally with the folding stays acting as waterstays. I'll slap together the lash up again and put a link up with pics or a short video hopefully this weekend if I can clear up some work quickly. Once tested and if it basically works but breaks I can always upgrade to a thicker heavier wall or sell a kidney and get 100mm carbon tubes made up.
  10. Vantage475T

    Single-handed cruising options

    Have you considered the Wanderer as a more easily single handed and slightly smaller Wayfarer? They are a lot lighter than a Wayfarer and easily righted single handed but still have decent load carrying capacity. You could also look at the replacement 38kg steel centreboard: http://www.porters.org.uk/Wanderer and a mast head float and they have outboard attachments so you can tick off a lot of the safety mitigation you are looking for. Not sure how many are around and prices but a retrofit steel centreboard would be possible on most small dinghies if you are prepared for a bit of work strengthening the slot?
  11. Vantage475T

    Small tri beams

    Hi Chris, Love your build too, I've been following your website for ages. Again that is super helpful knowing what bems you've used. Do you know roughly the max displacement of each your floats and the main hull and the overall weight of the boat?
  12. Vantage475T

    Small tri beams

    hi john, yes that is certainly an option I don't have a lathe but a mate does and I could probably get something engineered in a strong plastic to make a good fit in the socket if I was going that route still. That would also make the socket size larger again and I would need to take that into account and then work out how to fix the sleeve effectively. The hull/beam mounting points now will fit the beam ends perfectly moulding around the beams with fibreglass. On the test bed I chopped up a plastic cutting board (annoyed the wife) to make the tabs on my beams which helped spread the load to the socket well and made sliding in and out much easier - the socket was fine - the beam itself mainly due to the bolt hole caused the break which I knew before i did it but it was only hoped to last for one light sail. Sliding beams appears pretty susceptible to binding - I tried some test ones with uhmw tape and with reasonable tolerances and they still seemed likely to be unreliable. It was blowing well over 30 knots when it broke and we shouldn't have been out in reality - everyone else had long come in - but I'd had a very bad day and needed to lose some agression. It worked - I broke the boat but I felt much better! Anyway it gave me an excuse to get the Spitfire though as I knew I wouldn't have any time until next month to even begin thnking about it again and my wife just loves that.
  13. Vantage475T

    Small tri beams

    Thanks chaps, I've also put the question on boatdesign.net design forum and getting some feedback there as well. Zonker I will drop you a line shortly - greatly appreciated. I will find a copy of the Gougeon brothers book as well. Essentially I am trying to get an approximation of what is likely to be "about right" or in the "right ballpark" eg what is the beam specs on a Weta, or an Astus 16.5 or a Pulse 600? Very different boats and a big range I am aware. I can fabricate it from wood or weld up aluminium so I am open to anything. Currently seeing some more deflection tables etc I am looking at working initially with 100mm beams while I get started and get a main hull to work with then I can try working out the folding system and get some useful data. For the folding system I have sketched up the beams at the main hull end will fit into snugly fitting round moulded sockets and locked in place with rounded bolt down clamps so loads will be well spread there. As explained on the other site, I am certainly no engineer I just like making, breaking and remaking things and if I get it vaguely right all good!
  14. Vantage475T

    Small tri beams

    Hi, I am starting the next stage of my ISOmaran project shortly (finally) having had a nightmare 12 months with work and health. The basic outline is a kind of a stretched Weta I guess: 4.75m long with 3.8m beam. Main hull about 1 metre at its widest. Floats will be 4.75m with bouyancy in the order of 400kg - quite sizeable - and very different from the Weta in that respect. ISO dinghy sailplan so 14.5m2 main and jib with 18m2 assy. I'm aiming for single handed use mainly and the ability to fold using a sort of farrier type system. I weigh about 80kg but there will be the occasional extra person ranging from 60kg to 105kg (fat brother) hence wanting something a bit bigger than the Weta but still easy to handle on shore by one person. On my test rig I used 70mm round ally x 16swg which weighs around 1.09kg per metre. I snapped those beams off at the deck joint when we took off over a wave at high speed. It was badly fitted (rattling in the socket) and not unexpected (the hole drilled through for the holding bolt was obviously weakening it and too near the deck edge) and it was quite amusing when it broke with a pistol shot sound effect..... Anyway, looking at what I am now planning and learning from that project, I am comparing beams and trying to get an idea of what to use. If I use 70mm as a guideline - making it from the original ally the tramp frames will come in at around 16.5kg total or using douglas fir laminated 75mm x 75mm hollow centre 25mm wall comes in at twice that. I will have to go up a thickness for the ally I think to 10swg so the weight would be comparable. I can go bigger radius and keep thinner wall no problem 100mm 16swg for example or 100mm 10swg but the weight is really going to mount up A couple of questions if I could: How can I estimate and compare the stiffness of the different beams? Any figures around for laminated douglas fir? How it is made from laminations etc will ahve a big effect and I would also glass wrap it as much as needed. Would laminating thinner strips just add weight and no more strength? ie I could use multiple 6mm or much more simply 25mm thick. I sued 8 layers of 6mm when I made the beams for my Sport Tandem outrigger but the floats on that give about 50kg of bouyancy. The beams are incredibly strong - not tested to destruction but can take some punishment for sure. Would it be worth using douglas fir for the top and bottom (edge to edge ie 75mmx25mm) for example then something lighter like cedar for the sides ie 25mmx25mm. I could upgrade this size if needed no problem. Would that reduce teh strength too much for a trivial saving? If I stick with the ally I could look at a dolphon striker support underneath to keep the weight down BUT it will get in the way of the folding I think. Can anyone give me an idea of beams they have used / made on anything remotely similar? I can make and break them it's not a big deal but seeing if I am in the right ball park will be very helpful. I'm hoping to get an all up weight in the region of 150kg if possible. Main thing now is to try and get the diameter sorted at least so I can get the mountings planned in the main hull. I don't think I have the skills for carbon etc and this is also still a tester so no point throwing money at it. I will make them from wood initially anyway jsut to get dimensions sorted as doing the ally and welding it up does cost - get it wrong and you can't really change it... Any thoughts/advice gratefully received.
  15. Vantage475T

    Homemade small tri

    hi three bags, have you got any more details/specs or build info on your boat? I think it is tremendous. It looks like it is shifting along very nicely.