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depron hull and 'tights'

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Graham Jewitt14/01/2021 16:33:31
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I am attempting to build a pilot boat hull using depron foam and then propose covering with tights/epoxy as per Ron Rees article. However i am wondering how to deal with the 10mm deep keel. Would it be OK to attach the keel later or should I use glass cloth instead?

Tim Rowe14/01/2021 19:09:49
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Hello Graham and welcome.

I would attach the keel later. The tights would not conform around the keel and that would leave you a problem.

Tim R

Chris E14/01/2021 19:29:49
198 forum posts

I seem to remember that one one of his models Ron pinned the tights into the space that they would otherwise bridge.

It didn't sound very easy to me which is why I remember it. You would need to be sure that there was absolutely no gap anywhere.

I would be interested to know the penetration resistance of this construction method which I suspect isn't very much

Colin Bishop15/01/2021 10:41:30
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To be honest, while tights are better than nothing, it would be more effective to use proper glassfibre cloth with the epoxy. When saturated it will follow the shape of the hull much better and provide a stronger skin to the Depron.

**LINK**

Colin

ashley needham16/01/2021 09:05:54
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I would imagine that tights were used in the olden days as they were readily available and cheap, however nowadays we have purpose made stuff which does a better job and is not relatively expensive.

Ashley

redpmg16/01/2021 09:52:49
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Think Ron Rees would be better at answering this question - believe his article on a multi purpose hull promoted the same method ?

As an aside there are various other things one can use with dope or thinned polyester resin rather than fibreglass as even the fibreglass mats are unpleasant to use. However there is one very thin tissue type fibreglass meant for use on walls to hide small cracks and surface blemishes - lighter than tissue itself . Bought some in UK about 15 years ago - easier to use than the others and provides a strong surface.

The alternatives are the tissue meant for waterproofing roofs , waterproof paper towels (the kind used as washing up cloths usually blue or green which end up quite heavy) and finally nappy liners meant for use with cloth nappies. Used all three with polyester resin thinned about 30% & dope with success . Produced strong hulls with balsa . Paper towels over cardboard were used on a full size Beach Buggy - reluctant to use them on small boats because of the weight.

Have also seen a lightweight cloth tissue in the drapers (thanks to better half) - meant for stiffening light cloth in dressmaking - never got around to testing it - may well work too . All of these are preferable to paper tissue as it tears far too easily when wet.

Never tried epoxy resin as it not easily available in SA - should imagine it would work with any of these over foam . Hard to get anything model boat related here - including the magazine..........

 

Edited By redpmg on 16/01/2021 09:55:31

ashley needham16/01/2021 10:29:50
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I am not poo pooing the use of tights as a covering material, no doubt they are quite adequate and Ron no doubt had more than acceptable results.

J-cloths and wet-wipes also do the trick!

However, glass cloth is hard and when rubbed down it is quite smooth.

Ashley

Colin Bishop16/01/2021 10:59:17
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Back in the early 80s I used tissue nappy liners and shellac.. Best if liners were not secondhand of course.. Lovely smooth finish - just like a baby's bottom.

Colin

Chris E16/01/2021 11:41:22
198 forum posts

I fly models made of Depron (or similar) and cover the high damage areas in packing tape or laminating film. It certainly helps but I would not describe either as very damage resistant.

If I were to make a Depron hull I would in essence want to build a hull around it using the depron as a buck. How far you need to go with this would depend on the type and weight of the model, The ambition would be that whatever I covered the hull with was substantial enough to resist the damage that I inevitably subject my models to.

I don't think that, for me, one layer of tights would be anywhere near enough.

Colin Bishop16/01/2021 11:47:57
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Support tights then Chris?

Colin

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