looking for 6061T6 2"-1/2 OD 0.083" wall tube

[JLS]

I'm looking for 6061T6 2"-1/2 OD 0.083" wall tube and can't find it. (0.065" or 0.125" wall
only). I looked at aircraftspruce, wicks and onlinemetals. Have you some addresses ?

Thanks in advance for help.

[Bill Berson]

I don't know. But might try looking for aluminum pipe instead of tube.
Usually two thickness. Schedule 20 or 40 (or 80?)
Pipe is sold by inner diameter, more or less...
So 2" is 2.38" outside. https://www.onlinemetals.com/en/buy/aluminum-pipe

[lathropdad]

Try AED Motorsports, https://www.aedmotorsport.com/.

[JLS]

I found https://www.tubeservice.com/ (from a thread on homebuiltairplanes.com)
This reference is on their catalog.

If you have another one, I appreciate your sharing it if you want.

Thanks for your answers.

[cavelamb]

Aircraft Spruce

2-1/2 x .035

https://www.aircraftspruce.com/catalog/mepages/alumtube_6061t6.php

[JLS]

Thanks for sharing but this tube is for wing spars, 0.083" wall is for strength, (0.035" and 0.065" wall is too thin, 0.125" is
too heavy).2"-1/2 OD is for leading edge radius.

[Bill Berson]

The Avid is 2.5" x.065", I think.
Depending on your design, then another sleeve doubler at strut might work. Say 3 feet long slitted to clamp tight and rivet.

[JLS]

I'm interested in as strength as possible so 0.083" with wood doubler is my choice.

[2ndsegment]

I'm just catching up. I had learned 6061 is for marine use like Grumman canoes and boats, 7075 is for 707's and DC-8's and the new stuff is 7475 before GLARE. I had an ALCOA catalog in 1981 but that was just to examine catalog numbers that were neither sequential nor mathematical. "Neither a plumber nor an electrician be" in making exhaust pipes (pipe bender or conduit bender) and carefully choose the shoes and mandrels for the hydraulic tube bender to maintain constant section. Bear with my lack of agility. I think of strength for close-in missiles as 4130. How many g's? I lost you at 2. Then I found the BELL Cobra was limited to 120 degrees of roll angle. Pshew! I was way past comfort at 45 degrees.

[JLS]

Here are some notes and calculus.
These are SVG files, I advise you that to download them you should open them with a recent
navigator (Chrome, Firefox, MS Edge). There is no danger of computer viruses.

spruce sleeve inertia
https://drive.google.com/file/d/18oO0j1xHs8yBPuLws7KE7gFkvJyiQfT0/view?usp=sharing
(not OK in google drive preview, download to view)

Inertia of disc sector (rounded sleeve with tube fitting)
https://docs.google.com/spreadsheets/d/1JDouI6RJV61zJYPXuhGCqBwtJMgLNUFZCx2dyk-fnqQ/edit?usp=sharing
GoogleSheet discrete sum

3 view
https://drive.google.com/file/d/1ZLzTmSvkhwe--VVZSa9_5s7ofYPVMpGz/view?usp=sharing
(OK in google drive preview)

bending calculus of 2.5" 0.083" spar with wooden sleeve
https://drive.google.com/file/d/1FcPa_2HTg3WITmQ-M0yUu6qKV4gLR1eR/view?usp=sharing
(download to better view)

[Bill Berson]

The spruce doubler has only one fifth of E (Youngs modulus of elasticity) compared with aluminum.
Spruce E = 1.3
Aluminum E= 10

So almost no load transfer in the spruce.
might get more input on this topic at HomebuiltAirplanes.com

[JLS]

As seen in South Africa "kitplanes for africa".

With a tight fit, I don't see why it wouldn't work (and examples are flying).

8838

I must admit my proposition has a flaw, you don't have to use spruce for the sleeve doubler
but plywood and its contribution to bending moment is just marginal, it works for 1150 lbs MTOW
and 2.5" OD 0.083" wall.