UK-Cherub Forum
Cherub Chat => Tech Chat => Topic started by: john_hamilton on April 05, 2010, 10:22:02 PM
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has anyone got any old rs800 masts lying around that i can use for mast stumps and rack tubes?
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Make your own if you can.
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Hardy advanced composites in alnwick ias a good bet, they have all sorts of offcuts.
01665 602771
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I have access to some RS600 masts at a good price. There are two and a half of them.
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which type of rs 600 mast? angel or the other?
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2x Angel and 1/2x Superspar I think. I have PMed you with the price I have been given. I think it is best to make my own tubing for racks etc but I am still new to this, I am learning as I go along. ;D
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For the longways tubes I think that masts are overkill, but are spot on for mast stumps. For the sticky out wings they should be OK
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What diameter should the stump be to take a c-tech heel plug?
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rob, when are you ordering from c-tech?
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As Phil A says RS mast sections 800 or 600 will be ovekill for longways rack tubes. The Boom on Slippery was an RS 800 mast where as the boom on E-numbers ws made over Paul's mandrel. The Boom on Slippery is twice the weight of E-Numbe's boom. various layups were suggested in the thread on racks cook books.
The racks that Andy P supplied me were 3.4 kgs together and were 2.6m long each. Dimeter about 50mm.
If your racks were twice the weight your boat would be much closer to the 50KG minimum weight.
To get the optimum weight and the lowest cost either make your own or scavenge.
To get a pucker product and save sometime but paying 30% more i would buy tubes as I did. They are stock tubes so reasonably priced.
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phil, how much did the tubes from andy p cost?
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what kind of weight per square metre foam is recommended for bulkheads, 80grams?
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John,
Everything that went into EJ is here. http://www.sailingsource.com/cherub/test/doku.php/tech/3206build (http://www.sailingsource.com/cherub/test/doku.php/tech/3206build)
For some reason the hull/BH's had gone missing from the page!
R
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rob, when are you ordering from c-tech?
I think the boat will start life with a RS600 mast so I will only be buying spreaders from c-tech. Im going to hold off and wait and see if Ian C wants to get rid of his C-tech one. Happy to order spreaders when you are ready to save on shipping.
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A while ago I priced up making carbon tubes against buying stock tubes and there was very little in it.
For my first boat I made tubes from glass uni's and cloth on a drain pipe mandrel, they worked OK and would probably still be lighter than bits of mast. and still quite cost effective.
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i think im going with buying from andy patterson who will do them for around 100quid each
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Rob, you're buying spreaders from NZ?! Make them!
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I think masts and spreaders are best made in pre preg!
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i think masts are
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Rob, you're buying spreaders from NZ?! Make them!
The C-Tech spreaders are incredibly stiff and light, buiding to the same standard at home would be difficult, and time consuming
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My plan is: Take RS600 mast (Angel), belt sand the sail track and outer layer of cabon back (the sail track is damaged), possibly removing some material at the same time to make it lighter/floppier, add new outer layer of weave, add C-Tech speaders. Good starter mast for not much money. Any thoughts?
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rob do you want a whole RS600 mast? So ill have 1 1/2??? cool
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The best part of the C tech spreaders is the sleeve which gives them a good fit on a c tech mast.
For a home bru mast, homebru spreaders are fine, much cheaper, and v easy to make. You can make them from the offcuts of foam and carbon from the rest of your build. Further, you can attach them with fibres which go under the track, so they will be better attached.
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Sanding off the track is quite tricky, there is a slightly flexible filler between the carbon tube of the track and the top layer of woven cloth, it tends to gum up the sand paper, and generates a huge amount of dust.
How much of the track is damaged? when I rehabilitated an Angel RS600 mast I built a section of track from glass tube and filler.
I do not think that the masts are that stiff, the hounds placement makes a big difference. with the length of topmast used with most 05 rigs I do not think you will have too many problems.
i would worry a bit about reducing the robustness of the mast if you did sand all the outer layer off
A good option for a cheap mast if you can get it for close to frre though
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iv just discovered how hard that is to sand off, any hints and tips on getting it off a rudder that it was accidently spilt on?
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Sanding off the track is quite tricky, there is a slightly flexible filler between the carbon tube of the track and the top layer of woven cloth, it tends to gum up the sand paper, and generates a huge amount of dust.
How much of the track is damaged? when I rehabilitated an Angel RS600 mast I built a section of track from glass tube and filler.
I do not think that the masts are that stiff, the hounds placement makes a big difference. with the length of topmast used with most 05 rigs I do not think you will have too many problems.
i would worry a bit about reducing the robustness of the mast if you did sand all the outer layer off
A good option for a cheap mast if you can get it for close to frre though
Intersesting, I will have to have a think on this now! I have two 5m long RS600 masts with one good top section. My feeling was that a lot of the weight and a bit of fore/aft stiffness was in the track and filler so getting rid of that would not be a bad thing. I have also got hold of two winsurf mast bottom sections for rack tubes, they are light and stiff enough for the job. Any advice you have on 600 masts would be appreciated. I am still thinking of rounding off the section and going with the rather nice c-tech spreaders, but open to listening to others experiences.
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Iain C did an excellent write up on converting a 600 mast for Suicide Blonde. That mast is still alive and kicking, and looks the part.
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so far the only way iv found of getting that tacky sail-track stuff off is with a very sharp blade! very time consuming :(
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you got hold of a mast then?