Hull is too flexible

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Hull is too flexible

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1 November 2015 at 21:08 #61149
malcolm haines
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@malcolmhaines43236
I am more than halfway through my first build and have a problem of my own making, the hull flexes about a mm between bulheads. The plans required 3mm depron but I was not confident bending around sharp curves so I had the brilliant (not) idea of using 1.5mm.

Have tried to stiffen it with 3 layers of frostguard and about 10 coats of Eze Kote resin to no avail. I cannot increase the thickness of the hull by an appreciable amount.Cant access the inside enough to carry out work

help please

Edited By malcolm haines on 01/11/2015 21:57:43
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1 November 2015 at 21:08 #2517
malcolm haines
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@malcolmhaines43236
1 November 2015 at 23:05 #61152
Charles Oates
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@charlesoates31738
Is the deck on? That should stiffen the whole structure.
What is the model you are building?
1 November 2015 at 23:18 #61153
Dave Milbourn
Participant
@davemilbourn48782
I think Charles is right. Tubes are much stiffer in torsion than an open structure is. If that doesn't work then I'd suggest trashing the thing and starting again with the recommended material. That way you won't waste any more of anything.

As someone who has designed model aeroplanes and boats I would always recommend following the instructions. The bloke who designed the thing might appear to you to be a total idiot, but he's built at least one more of them than you have.

Dave M
2 November 2015 at 00:58 #61155
Dodgy Geezer 1
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@dodgygeezer1
The plans required 3mm depron but I was not confident bending around sharp curves so I had the brilliant (not) idea of using 1.5mm.

Your options are either to add rigidity inside (but you don't have access) or outside, by putting on another layer of 1.5mm Depron, cut a bit oversize.

It is a standard technique to create sharp curves by building them in two or three layers of easily-bent material, so you might have planned to do the 3mm as two layers of 1.5mm. I'm not sure why you 'can't increase the thickness of the hull' by adding to the outside – could you tell us?
3 November 2015 at 17:42 #61164
malcolm haines
Participant
@malcolmhaines43236
Thanks everyone for for your comments.

The only reason for not adding an extra layer on the outside was that I was not sure of getting full contact around the curves but I will do as you suggest. Nice to know that this is something do as a matter of course.

Dave M, So far I have broken Strings (2No) and a bulhead through being heavy handed and did not want a repeat fixing the hull, as I said "was not confident bending around sharp curves" and nothing to do with the designer.

Thanks all
3 November 2015 at 19:26 #61169
Dodgy Geezer 1
Participant
@dodgygeezer1
I was not sure of getting full contact around the curves…

I've not worked in Depron before, but I suspect that a contact adhesive would solve that particular problem…
3 November 2015 at 22:41 #61173
malcolm haines
Participant
@malcolmhaines43236
thanks, will look for a foam safe one

cheers
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