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Any cheap recommended modelling foam

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Christopher Morris 212/06/2020 11:48:12
207 forum posts

Always looking for a cheap alternative to the hobby. Any cheap recommended modelling foams out there you can recommend. IE: packing materials, insulation boards & alike. Also, any recommended paint finishes as i realise some paints will melt many foam's. This could be for plane, boat, hovercraft.
Also, any foams to avoid. Thanks

Edited By Christopher Morris 2 on 12/06/2020 11:49:11

Nigel R12/06/2020 12:54:15
4403 forum posts
717 photos

The obvious one is the foamboard sold by Hobbycraft in A1 size sheets, 4 for £10.

Romeo Whisky12/06/2020 13:04:54
755 forum posts
207 photos

The Range also sell big sheets of foam-board - same price. Great for building really cheap models that fly well.

For small models you could also try Wickes Proplex corrugated plastic sheeting - £2.50 for a large sheet.

Here's my little "Chuckle" made from Proplex sheeting covered with coloured packing tape.

Chuckle in flight.jpgChuckle Home-build.jpg

Nigel R12/06/2020 13:08:31
4403 forum posts
717 photos

is proplex like correx?

Romeo Whisky12/06/2020 13:15:58
755 forum posts
207 photos

Hi Nigel - Proplex is similar to Correx but slightly thinner and lighter.

Here are pics of my foam-board "Upstart"

upsatart build 115.jpg

the motor mount is a Bovril jar lid

upsatart build 113.jpg

upstart in flight 32c.jpg

Christopher Morris 212/06/2020 14:18:37
207 forum posts

AH, Tanks guys, a good bit of info. I forgot about the Range. What do you prefer for cutting this material? IE: Hotwire, Stanley, scalpel.
Like the jar lid. I may be older, so i will keep the Ovaltine lids. Also, i drink Douwe Egberts so coffee lids are out as i think the glass lid will make it nose heavy.

Edited By Christopher Morris 2 on 12/06/2020 14:20:04

Romeo Whisky12/06/2020 14:45:30
755 forum posts
207 photos

Single-edge razor blades are great for straight cuts; #11 scalpel for curves. For glue I use hot glue gun or UHU POR. Remember foam-board is not rain or dew proof, so some packing tape around exposed edges is advised.

Like corrrugated cardboard the Proplex strength is in one direction only and it's very bendy along the internal corrugated flutes but stiff laterally, which you need to bear in mind when designing/building. You can slide a thin carbon rod down the flutes to make a stronger wing spar etc., although I didn't do this with the Chuckle as the tape gives extra strength and rigidity, and leaving it flexible gives it a slight dihedral in flight even though the wing is one flat piece of Proplex. When building, you need to be careful not to accidentally introduce a crease as that will be a weak point.

Christopher Morris 212/06/2020 16:51:29
207 forum posts

Thanks, Romeo, Can you remember if it was 2,3,4mm Proplex as for some reason there is a doubling in price from 3 to 4mm`Not sure why.

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