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    Sheet Metal Bending - Equivalent Material Gauges

    Mechanical bending brakes are usually sold as 22, 20, 18 or 16 gauge - meaning thickness of mild steel sheet that they can bend. Sometimes you have a table which lists the equivalent thickness of aluminum that can be bent. However, there's never any mention of aluminum series or temper. Does...
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    Heinkel 222 Reference in Ladislao Pazmany Landing Gear Book

    Anybody ever heard of the Heinkel He 222 - referenced in Pazmany's "Landing Gear Design for Light Aircraft", page 186. I quote - "The landing gear illustrated in Figure 10-121 employs a unique torsion spring arrangement. Four torsion bars are restrained from rotation at the top by means of...
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    Strut Wire Interference Drag Conumdrum

    I went to the Beechcraft Heritage Museum at Tullahoma TN recently (much recommended). They have a "cut-away" Staggerwing without any skin there... and I took the following picture of the intersection of the lift wires with the strut at the top spar (unfortunately the uploaded image is on its...
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    Fuselage C Frame - How good does it have to be?

    I would like to raise a somewhat philosophical question. I have been working on a aluminum stressed skin tailcone, constructing C-Frames of a roughly rectangular shape with curved corners. The top corners approx 5 inches radius, the bottom corners roughly 8 inch radius. The frames...
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    SN Diagrams for 6061-T6 - Where to find?

    So I've been re-working a design to work with 6061-T6 instead of 2024-T3. In my original design, I selected the limit stress for airframe life using the SN diagram for riveted lap joints from Bruhn (Fig C13.14). This same diagram is reproduced in Hiscock's "Design of Light Aircraft" (Fig...
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    Aging 6061-T4 to 6061-T6 - What's the catch?

    I have been weighing various aluminum sheet selections against the formability requirements for my design. The hard tempers impose limitations on formability; the formable tempers have reduced yields limits. I have tried forming a particular bulkhead (the usual problems with shrinking and...
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    How long can you work 2024 sheet starting from condition W

    A quick question for those that have more experience in the sheet metal field than I... Assume I solution heat treat a flat blank made of 2024-O and then hand work it over the form block after quenching (the blank starts in condition W). How much time (roughly) do I have to work it before it...
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    Distributing rudder side (shear) forces to 3 hinges

    I'm in the middle of a detailed design of the main spar for a tail fin - and I'm trying to figure out how to distribute the aerodynamic forces on the rudder to the hinges, as shear forces applied to the fin spar. Two hinges is no problem - as that's a statically determinate problem. Three hinges...
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