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

  1. #11

    Join Date
    Oct 2011
    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

  2. #12

    Join Date
    Nov 2017
    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).

    Name:  doubler 1.jpg
Views: 92
Size:  15.3 KB

    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.
    Attached Images Attached Images  
    Last edited by JLS; 04-04-2021 at 12:38 PM.

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