Eagler's Nest
Airframes => Single Seaters => Topic started by: milanesa711 on December 13, 2014, 04:17:50 AM
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Hello, for some reason unknown to me, today is easier to get 4130 to 6061, price and availability, only that I need to finish my Xl to-40.
Which 4130 tube can be used for the wing struts? It is heavier but my xl is a full vw, not far103 ... Thanks !!!!
Martin Bianco
Argentina
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My plans are for the standard LE. I believe it calls out for 1.25 x .058 6061 Aluminum. If the XL calls for the same, than the following numbers might work. I encourage you to get a second opinion on these numbers.
6061 Aluminum (.26 lb/ft) 1.25 x .058 = .217 in2 with a yield strength of 40,000 psi = 8687 lbs force.
4130 Steel (.454 lb/ft) 1.25 x .035 = .134 in2 with a yield strength of 63,100 psi = 8429 lbs force.
Those numbers should be many times more than the stresses experienced during flight even if you consider the stress concentration points around the mounting bolts. Again, get a second opinion.
Note: the plans then show 1-1/8 x .035 steel tubing at each end of the strut. There lies the weakest link in the strut.
Vince
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Thanks Vince!! I keep searching....
Yes the 11/8 at the end of the struts is the weakest point
Thanks!!!
Martin Bianco
Argentina