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| Replica Aircraft Topics related to the construction of WWI replica aircraft |
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20 October 2009, 11:19 PM
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#1 (permalink) |
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Scout Pilot
Join Date: Mar 2005
Location: Melbourne
Posts: 383
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Wing fitting material?
It's been a while since I posted but I need a few opinions on material for fabricating wing fittings. The fittings are shown circled below:
 And a CAD drawing of the fuselage fitting:  The wing ('male') fitting is a cone like shape that's welded to the sheet metal fitting shown in the first sketch with lightening holes. The original calls for 'steel'. Any suggestions on the most suitable steel? The fitting holds the lower wing on - I'm sure you can see why any twisting motion in the wing could cause the fitting to crack. The fitting will need to resist torsional loads and shearing loads and remain fairly rigid without being brittle.
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21 October 2009, 03:49 AM
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#2 (permalink) |
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Forum Ace
Join Date: Aug 2001
Location: Ft. Worth, Texas
Posts: 1,732
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4130 steel perhaps?
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21 October 2009, 04:05 AM
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#3 (permalink) |
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Scout Pilot
Join Date: Feb 2004
Posts: 401
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The original steel used in WWI was quite a bit softer than modern steels. Spec sheets I have seen from both Britain and Germany for the time show a requirement of 30,000 to 35,000 psi tensile strength. Most common steels at that time were in the 30 -45,000 psi range. This kind of explains the more complex fittings used then, trying to compensate for the strength of the base material.
Safe answer, use 4130 aircraft steel, 90,000 psi. But even the common modern 1018 Cold Rolled Steel is 50,000 - 55,000 psi. Your drawing doesn't show the size, but finding 4130 round bar over 1.75 inch diameter is difficult. Easier to find 4140, which is as strong. Problem with 4140 is if it is welded, it can become very hard and brittle. Welded parts would need to be sent out and annealed back to their original state. Not a problem with 4130 or 1018. |
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23 October 2009, 04:45 AM
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#4 (permalink) |
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Scout Pilot
Join Date: Mar 2005
Location: Melbourne
Posts: 383
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ulpilot - thanks for the figures, makes choosing a material a bit easier. Excuse my ignorance but why is 4130 the default aviation standard steel?
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24 October 2009, 04:02 AM
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#5 (permalink) | |
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Scout Pilot
Join Date: Feb 2004
Posts: 401
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Quote:
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