6082 T6 tube spar

[Static line]

Good evening
I am going to pick up some plans in the morning for a flying wing, designed in the UK.
The designer calls for a 100mm x 1.5mm wall 6082 T6 aluminum tube. @ approx 4” my initial search has turned up nil. After many years of study I don’t like to second guess the designer when it comes to material substitutes. I looked @ builditwith, an easy to compare material site.
My question, anyone know of a place in the US that has this tube. If not what are my options.
I know you folks might be interested in the topic aircraft in discussion; MW9 Plank
The plans may be found @ mwclub.org
Yes, Comelli SRL, emergency parachute for a second chance. I am a low time guy.

 

[WKTaylor]

The UK has a few alloy s in common usage that are virtually unknown in the USA... and might have to be specially imported, such as Alloys 6063 [and now] 6082.

6061 vs. 6082 Aluminum Forging

www.dropforging.net

Aluminum Extrusions Alloy 6061 And 6082 | FONNOV Aluminium

Extruded Aluminum Profile Manufacturer Of 6061T6 And 6082T6. FONNOV Aluminium Extrusion And Aluminum Fabrication In China since 2004.

www.fonnovaluminium.com

IF YOU HAVE PLANS... and can contact the designer... ask for a 'USA equivalent/suitable substitute [alloy/temper/inches units]... or a 'source' in Canada.

 

[rb1957]

a quick google found (so do your own searching first, please) tensile strength = 22ksi ... yetch !
so 6061T6 would be a reasonable substitute

 

[Static line]

The UK has a few alloy s in common usage that are virtually unknown in the USA... and might have to be specially imported, such as Alloys 6063 [and now] 6082.

6061 vs. 6082 Aluminum Forging

www.dropforging.net

Aluminum Extrusions Alloy 6061 And 6082 | FONNOV Aluminium

Extruded Aluminum Profile Manufacturer Of 6061T6 And 6082T6. FONNOV Aluminium Extrusion And Aluminum Fabrication In China since 2004.

www.fonnovaluminium.com

IF YOU HAVE PLANS... and can contact the designer... ask for a 'USA equivalent/suitable substitute [alloy/temper/inches units]... or a 'source' in Canada.

I have chatted with you on HBA, but I was banned! Wanttobuild
Mr. Whittaker for years have kept his plans out of the US because of the availability of the necessary materials were unobtanium.
I have the plans in hand and they show proof tests of the spar and fuselage.
Now I can build a carbon tube spar and proof it.
That was a very nice addition to the plans

 

[rb1957]

"unobtainium" ... you can always buy them in the UK and ship them. I'd've thought that he didn't sell his design in the US due to liability and litigation.

Building and testing a carbon tube is cheaper than buying 6061T6 and testing that ?? And testing to include composite knock-down factors ?

 

[Static line]

"unobtainium" ... you can always buy them in the UK and ship them. I'd've thought that he didn't sell his design in the US due to liability and litigation.

Building and testing a carbon tube is cheaper than buying 6061T6 and testing that ?? And testing to include composite knock-down factors ?

I consider myself a composites guy. I have many many yards of high quality carbon on hand.
The plans show a proof load test for both spar and fuse, so that allows a non engineer type to quality his or her spar.
I ran across a 6061 substitute on the plans this morning, but I’m gonna go ahead with PVC foam, forged carbon and carbon reinforcement

 

[WKTaylor]

FYI ONLY... Composite tubes professionally manufactured...

Composite tubes

At Exel we manufacture a wide range of composite tubes, from standard round tube dimensions using fiberglass, carbon fiber, or a hybrid mix of reinforcements to completely customized tubes to meet your specific requirements. Whether you are looking for a glass fiber tube, a carbon fiber tube or...

exelcomposites.com

Shop Composite Tubes

Shop quality Composite Tubes at Rock West Composites. Where Great Products, Great Service, and Great people are at the forefront of everything we do.

www.rockwestcomposites.com

Tubes & Rods - ACP Composites

As an industry-recognized leader in composite tube manufacturing, ACP Composites is able to provide an extensive range of high performance, light weight composite rods and tubing for use in a wide variety of industries and applications. Our assortment of composite rods and tubes are manufactured...

acpcomposites.com

DragonPlate | Engineered Carbon Fiber | Made in USA

DragonPlate offers custom carbon fiber shapes and carbon fiber composite products, including tubes, sheets, and plates.

dragonplate.com

and so-on ...

 

[SWComposites]

The plans show a proof load test for both spar and fuse, so that allows a non engineer type to quality his or her spar.

Warning - what load level is the proof load test done to? if it is not some factor above ultimate load (1.5*Limit) then it proves absolutely nothing.
Also, composites are linear to failure, with fracture occurring suddenly and completely; unlike metals there is no "yielding" with composites; therefore any stress concentrations or flaws in the composite tube can be a weak point, and the local stresses will not cause local yielding to relieve the stress concentration.

 

[Static line]

Warning - what load level is the proof load test done to? if it is not some factor above ultimate load (1.5*Limit) then it proves absolutely nothing.
Also, composites are linear to failure, with fracture occurring suddenly and completely; unlike metals there is no "yielding" with composites; therefore any stress concentrations or flaws in the composite tube can be a weak point, and the local stresses will not cause local yielding to relieve the stress concentration.

3.6G
I am proficient in composites.

 

[Static line]

FYI ONLY... Composite tubes professionally manufactured...

Composite tubes

At Exel we manufacture a wide range of composite tubes, from standard round tube dimensions using fiberglass, carbon fiber, or a hybrid mix of reinforcements to completely customized tubes to meet your specific requirements. Whether you are looking for a glass fiber tube, a carbon fiber tube or...

exelcomposites.com

Shop Composite Tubes

Shop quality Composite Tubes at Rock West Composites. Where Great Products, Great Service, and Great people are at the forefront of everything we do.

www.rockwestcomposites.com

Tubes & Rods - ACP Composites

As an industry-recognized leader in composite tube manufacturing, ACP Composites is able to provide an extensive range of high performance, light weight composite rods and tubing for use in a wide variety of industries and applications. Our assortment of composite rods and tubes are manufactured...

acpcomposites.com

DragonPlate | Engineered Carbon Fiber | Made in USA

DragonPlate offers custom carbon fiber shapes and carbon fiber composite products, including tubes, sheets, and plates.

dragonplate.com

and so-on ...

I appreciate you sharing professional composite tubes available. They will not entertain some random guy wanting to order a couple of tubes.

 

[rb1957]

I think the testing data means he knows what to original design did, which is good. Whatever the original design proved, this new tube should meet or better and should account for new design variables (like composite knock-down).

Also I don't think this is a FAR23 design, but a owner-builder kit plane, and as such the requirements are very different ... a lot more "caveat erector".

 

[WKTaylor]

rb... You did it again! I will add this one to my list of Latin sayings... 'Caveat Erector!'

 

[rb1957]

yeah, rather proud of that one !