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Alternative to Dural

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Andy Joyce18/10/2020 11:20:53
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Wondering if the metal strip you can buy is Wickes & B&Q is a suitable alternative to Dural to make an undercarriage.

Denis Watkins18/10/2020 11:28:06
4649 forum posts
131 photos

Dural is tough, and very lightweight Andy, so is difficult to substitute.

Large models can cope with heavier u/c

Mike Bell18/10/2020 11:46:38
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HI Andy, I'm pretty sure that the stuff in B&Q will be too soft. You need an alloy from the 2xxx or 6xxx series of age hardenable grade alloys. I would suggest you look at somewhere like Noggin End Metals where they have 2014 and 6082 grade alloys that would be more suitable. There is a link below if it works.

LINK

Mike Bell18/10/2020 11:48:10
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302 forum posts
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OK that link is a dud, try this one.

LINK

cymaz18/10/2020 12:01:39
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9373 forum posts
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Not interested in carbon fibre? I’ve had several cf undercarriages from AliExpress. All excellent.

kc18/10/2020 13:32:16
6707 forum posts
173 photos

You could aways try the B&Q stuff. I found the 15mm by 1mm strip they sold was suitable for cabane struts on a Barnstormer, seemed rather like dural.

However it's best to buy the right stuff -DB Sport & Scale sell dural priced per 100mm. They also cut and bend to shape but it's not cheap. Or they sell preformed u/c for their designs see their Plan Packs.

Edited By kc on 18/10/2020 13:38:42

Chris Bates18/10/2020 15:56:33
52 forum posts
144 photos

Have used 6082 T6 for the Renaissance x 2 Undercart not bent it yet. 7075 T6 is stronger than 6082 T6 it's just harder to find in small amounts

Aluminum Alloy 7075-T6

Aluminium Alloy 6082 T6

Andy Joyce18/10/2020 16:33:39
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318 forum posts
64 photos

Thanks all, Noggin metal would be a good source but need a length close to 56cm for a Panther autogyro.

Barrie Lever18/10/2020 16:42:35
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Andy

Go with 6082 T6 pretty easy to buy, often for sale on Ebay, try looking for Aluminium Droitwich they are the seller I usually use for this type of material.

7075 T6 is really good, it has similar strength to a regular mild steel but with the weight of aluminium, it is used as connecting rod material in model racing engines among many other things.

7075 was developed by Sumitomo in WW2, I am pretty sure it was used first off in the Zero fighter.

Don't even bother starting the car to get UC aluminium from B&Q it is totally unsuitable, as suggested above it is very soft.

B.

Andy Joyce18/10/2020 16:46:30
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318 forum posts
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Well a quick search on ebay found a supplier of 6082 selling 600mm lengths of 19x3.2mm for £7.

Matt Carlton18/10/2020 17:07:21
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Also available;

6082 T6: 600mm x 100mm x 3mm for £10.50

Clickmetals

 

Edited By Matt Carlton on 18/10/2020 17:07:39

kc18/10/2020 17:35:48
6707 forum posts
173 photos

The Clickmetals price excludes delivery and VAT which puts the price up to over £30. 15 pound for delivery and VAT on top!

Might be better to buy from DB Sport & Scale where it also costs about £7 and you might buy other items to make the delivery cost worthwhile.

Worth mentioning here that dural is softened by rubbing some soap on it and heating until the soap turns black.   After bending etc it hardens again after a few days all on it's own.

Edited By kc on 18/10/2020 17:40:23

Edited By kc on 18/10/2020 17:41:28

Matt Carlton18/10/2020 18:51:25
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85 forum posts
9 photos

I didn't see the delivery price. That's a bit steep. Thanks for pointing that out!

kc18/10/2020 19:22:47
6707 forum posts
173 photos

Actually its 600mm of 19 x 3 mm that costs 7.20 pound at DB which compares with ebay. To be fair Clickmetals is for a 100mm width, so not like for like. Delivery is all important when buying online and they usually don't mention that until the checkout.

If one is not proficient at metal bending it might turn out cheaper to buy a ready made item rather than scrap a misbent one. Also consider buying or making a carbon u/c.   Carbon Copy do u/c for about 14 pounds up with postage of about 6 pounds for up to 4 items.  Somewhere on the forum is a thread about laying up carbon & epoxy u/c.

Personally I prefer 8SWG piano wire u/c of the torque rod type ( as in recent Peter Miller designs and many others) Needs a wire bender but that is available from 4Max for about 18 pounds. Absorbs the landing shocks better and easily rebent at the field if a bit out of shape.

Edited By kc on 18/10/2020 19:40:54

cymaz18/10/2020 19:25:28
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9373 forum posts
1214 photos

 

 

AliExpress

Edited By cymaz on 18/10/2020 19:28:08

Robin Etherton18/10/2020 20:46:37
301 forum posts
48 photos

Hey guys “he 15” is the grade you want not 6082.

Noggin end metals has it.

Machines like silk to a high gloss.

Robin

Ronaldo18/10/2020 21:30:09
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270 forum posts
21 photos

If you wish to go with carbon fibre, I've had 3 full solid carbon u/c for 50cc - 60cc models which I've been happy with from here .....https://carbonrcparts.com/

I've had some from carbon copy , but they were just glass fibre laminated with carbon fibre on the outside, not solid carbon . They were OK for smaller sports models, but after a short while on my 50cc - 60cc these delaminated and split along the glass fibre sandwiched between the outer top and bottom carbon fibre layer. Hopefully they may have improved by now, I've not had had any more since.

Edited By Ronaldo on 18/10/2020 21:31:59

Edited By Ronaldo on 18/10/2020 21:36:35

Edited By Ronaldo on 18/10/2020 21:39:03

Barrie Lever19/10/2020 09:33:15
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342 forum posts
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Posted by Robin Etherton on 18/10/2020 20:46:37:

Hey guys “he 15” is the grade you want not 6082.

Noggin end metals has it.

Machines like silk to a high gloss.

Robin

HE15 is equivalent to 2014 which is a Dural material..

B.

Robin Etherton19/10/2020 15:16:31
301 forum posts
48 photos

Barrie

yep!

Barrie Lever19/10/2020 18:17:30
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Robin

The OP was looking for an alternative, not quite sure why.

Plenty of good options in the thread including yours.

B.

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