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  1. TAProwler

    Where building time comes from

    Interesting choice for a thread topic, LS. It is very relevant to accomplishing the task building of an aircraft (or any other large, complex project requiring 1000's of hours of toil). Not sure if I have anything useful to add to the discussion, but I do have a few observations to contribute...
  2. TAProwler

    Flying career for daughter

    Hey Scrapper, Here's my $0.02: 1. Congrats to you (and mom??) for raising great kids!! 2. If you live in WI (I was raised in New London) - THEN YOU ABSOLUTELY MUST GET YOUR GIRLS TO GIRLVENTURE 2019!!! https://www.eaa.org/eaa/apps/GirlVenture/ParticipantApplication The youngest 2 of...
  3. TAProwler

    Low wing pusher configuration?

    Actually, if you look closely at the Citation X, the bottom of the belly fairing is flat, or nearly flat, across the entire bottom. Then, there is a smooth radius curve that squares off the fuselage and brings it to 90 deg to the lower wing skin. There is a small 90 deg joint between the...
  4. TAProwler

    Low wing pusher configuration?

    "Does anyone know why or what these enormous wing root fairings are called on modern low wing jets" Why - If I remember correctly, I read that the least drag configuration between a wing and an adjoining surface is either a 90 degree angle or a zero degree angle. Basically, they are building...
  5. TAProwler

    Bending 2" ID, 8ft Long "C" Channels From 0.040" 2024-T3

    Hi Ed, Sure. I don't have any kind of "plans," but I do have some pictures of the fabrication. We made it from a bunch of "I" beams I had laying around. It's basically an "H" frame design. The top beam is stationary and holds the upper die. The middle beam slides up and down and holds the...
  6. TAProwler

    Bending 2" ID, 8ft Long "C" Channels From 0.040" 2024-T3

    Press brake success! I just wanted to post a follow-up on the flange bending. I was really using these 2" ID channels as practice on, and to calibrate my purpose built press brake. After learning more about the metal/material properties in this thread, I bent up one last 2" channel and it...
  7. TAProwler

    Bending 2" ID, 8ft Long "C" Channels From 0.040" 2024-T3

    Agreed. This "canoe-ing" effect you see is also (mostly) a function of the material. You get LESS spring-back at the ends and MORE spring-back in the center (pretty uniformly - I might add). The net affect is a flange that is "canoe" shaped. This I had previously identified and is the...
  8. TAProwler

    Bending 2" ID, 8ft Long "C" Channels From 0.040" 2024-T3

    Great link Hot Wings. This adresses exactly what I am seeing. Thank you for posting this. As I mentioned above, now that I know that it more a property of the material, I think I have found a way to work around the bow and still get a straight flange on the other side. This was a great help...
  9. TAProwler

    Bending 2" ID, 8ft Long "C" Channels From 0.040" 2024-T3

    Hey Jay, Thanks for the help. I agree (now). It appears to have the bow in both flanges, similar to what is shown in the link that Hot Wings provided. I'm pretty sure that the camber phenomenon is what I am seeing. There doesn't seem to be much I can do about the bow happening, but I think...
  10. TAProwler

    Bending 2" ID, 8ft Long "C" Channels From 0.040" 2024-T3

    Hello Everyone, I am trying to bend "C" shaped channels that are 8ft long and are made from 40 thou. thick 2024-T3. The flanges are 3/4" and the channel has a 2" I.D. Here is a CAD drawing: So, I start with a straight strip of material that is 3.6" wide and 8ft long. I put the piece into...
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