|ashley needham||12/07/2017 08:49:23|
7353 forum posts
Fellow boaters. The time has come to try and make a fibreglass hull.
|Bob Abell||12/07/2017 08:54:55|
9334 forum posts
How about this for an option?......
..........Use an existing boat hull as the plug and make a mould from it?
What type of hull are we talking about?
|Ray Wood 2||12/07/2017 09:11:25|
2505 forum posts
I guess this is a new boat ? I'd carve the shape in Blue foam, plaster of paris skim, then polyester resin, rubbed down to a fine finish, then 10-15 coats of Bees wax polish, should release ok I did this last year to produce a winged keel for my sailing barge. I did buy a book on GRP moulding from Amazon by Ron Warring but it was very basic and 30 years out of date
|harry smith 1||12/07/2017 11:40:36|
|1088 forum posts|
The bees wax is OK but, they have a releasing agent which works well!!!
And Ray a winged keel for a sailing barge !!!!
Looks like Rays having a crack at the Americans Cup !!!
By the way, who invented the winged keel !!!!
|ashley needham||12/07/2017 13:52:46|
7353 forum posts
Chaps. Yes a new boat so unable to use an existing hull, and no clues as to type.....
|Dave Milbourn||12/07/2017 15:17:13|
4025 forum posts
I shall be doing a symmetrical hull so only one half is needed
|Paul T||12/07/2017 16:22:18|
7335 forum posts
I think that as it is a symmetrical hull Ashley intends to make it in two halves and glue them together.
It is true to say that a fully symmetrical hull is a very rare beast and knowing Ashley this project will be interesting and very different.
I'm off to google symmetrical hulls and see if I can guess what it is.
|ashley needham||12/07/2017 16:51:22|
7353 forum posts
The underwater shape is same both ends as is the above water shape. AT LEAST that's what it says. Pictures are hard to come by, but the (probably builders) half model I have seen a picture of shows a possible rudder port at the aft end...its a bad photo. In which case the blurb is lying and it is not quite symmetrical. I would still make two halves and join them, then cut a hole at the stern and do a bit of re-shaping as easier than making a two part mould, especially for a one off.
|John W E||12/07/2017 16:53:41|
276 forum posts
couple of golden rules with fibre glass - Get the mix right; i.e. hardener to resin - making sure you have the correct temperature (not too hot - not too cold ) and don't mix batches that are too large. In other words the size batch which you cannot use up within 30 minutes.
With regard to materials from which to make moulds - as has been stated previously; there are 100s of items which can be used. Make sure though that whatever you use doesn't react to the resin. You may even use cling film as a releasing agent; the other thing is watch out for undercuts in your moulding for when you release the moulding from the plug. A lot of folk don't foresee this and they don't realise why the moulding doesn't release properly and they end up breaking it. So you are making a symmetrically based hull? Could this be the Russian circular ship from the 1800s? Have to go and do some Google.
Edited By bluebird on 12/07/2017 17:06:40
|Colin Bishop||12/07/2017 17:04:48|
4961 forum posts
A war canoe - presumably manned by a bunch of hard boarders?
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