T Foils

[Phil Alderson]

Is this something that a dismantled block could solve?

[Banshee Ambulance]

Thats an expensive way to buy ball bearings!

[MK]

We have already solved the problem, with ronstan sheaves i found and p and b happily ordered in

[Will_Lee]

http://www.ronstan.co.uk/marine5/product.asp?ProdNo=RF1020

Couple of these, axle between. £6 a pop I think.

Next is to sort out the UJ. The double pin joints wrapped up in bike inner tubes are ok, but not perfect:

http://www.ondrives.com/couplings-universal-joints-8-25mm-bores.html

I have some moth-style hydraulic pipe which may work, but if not I was thinking of a home bru one.

Oh yeah - we never made the cranked spindle - it didn't seem necessary.

[john_hamilton]

iv found those "on-drives" get stuck in a postion at really inappropriate times, especially when there is a large angle between the extension and 90degrees from the tiller, like when sitting very forward in light winds (not to bad) or standing at the back of the bus with the spinny up in ridiculous winds (worse), i have only sailed with theese kind of things on an 18 so im not sure this would happen to cherubs

[Banshee Ambulance]

i have only sailed with theese kind of things on an 18 so im not sure this would happen to cherubs

You have been helming an 18 John? I'm impressed.

What about modifying a jib furler to sit on the end of the tiller as as the drum? The 14s use something similar but I have so far been unable to find one.

[Will_Lee]

Sorry in wrong place. E5 mould with Andy p in prep for joins build!

ON ferry on way back. Weather good but so many smokers!

[john_hamilton]

Rob, would one of those furling drums they use on SMODs work (Xenon, Vago, Vision,etc) or is it too big? i may hae a few lying  around somewhere, and yes i have helmed an 18 a few time, you should try it, its incredible fun (apart from when tiller loads up and UJ is stuck at the same angle, flinging you into the other crew)
will, did you take it down this weekend, we are very gratefull!!!
also, does anyone know where i should post the roylaty to? (kevins address)

[Phil Alderson]

Some time ago I think that I was quoted about £40 for an int 14 style drum, complete with flexible joints. I think that it was from Ovingtons but I am not sure.

[Banshee Ambulance]

Would it be technically feasable to build a rotating gantry t foil set up that was controlled by a tension cable? The tension cable would then be adjusted via a srew thread within the tiller, which would then in turn be driven by a worm drive with the two tiller extensions running through it. This has the advantage of MASSIVE purchase, no expensive blocks, potentially quite light and simplicity. The Moths have proved that cable systems can be used in a marine environment, the question is would it handle the load?

[Will_Lee]

This is v like the daemon system, where a worm gear pulls on the top of the rudderpin to deploy the t foil. The worm gear seems like a good idea but poor efficiency and no feedback (as well as engineering problems of having a slot int he tiller) put me right off the idea.

[daryl_wilkinson]

Personally I think this is the most elegant solution....

[Will_Lee]

I saw that at the show. The huge lump of metal could be quite a handy murder weapon, so I suppose it has some merit.

[Tim Noyce]

I guess this is a feasible solution when you build a 12 foot boat out of carbon which has a minimum weight about 30kg heavier than a Cherub?! Just googled and the minimum all up hull weight is 78kg, so even with that scaffolding I am pretty sure they will need a fair bit of lead.

[daryl_wilkinson]

Err.... I'm not suggesting the material use! Just the design of the system. A while back I talked about a 'might screw' moving the bottom pintle like the one you see in Joe Richards design here.