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  1. TreeTopPilot

    4130 tube quality question

    Read a lot bout China tubing on the bearhawk forum...... The point in all of this is...BUY FROM REPUTABLE DISTRIBUTORS. Insist on the original mill test reports and nothing less. Check the heat number on the test reports and that it matches the stenciled heat number on the material. Check that...
  2. TreeTopPilot

    4130 tube quality question

    I didn't mean to create a forest fire. I'm just trying to learn and have a more in-depth knowledge of what I'm working on in really do appreciate the conversations that are following. if nothing else it may stop someone so that they will question their materials before they begin to build. I...
  3. TreeTopPilot

    4130 tube quality question

    I don't really have a source to appropriately test the tubing in question at this point. Come to think of it with my Google foo at its peak revealed nothing on the interweb about how to test it to other than Sonic and Eddy current test. then again I don't know if those processes would reveal...
  4. TreeTopPilot

    4130 tube quality question

    I can't find any suitable way to test this tubing here so I welded a piece of the 3/8 .035 to a couple of pieces of scrap and proceeded to twist it with a line marked on it Center line prior to twisting. It made almost three complete twist until the sidewall buckled. I have not built the...
  5. TreeTopPilot

    1/2 VW plans

    The 45 hp half vdub I have runs fine. Baught parts from Scott and built from there. 32 hours on it. Pulls a 56 x 24 performance propellors prop 172 lds static pull @ 3150 rpms. Dual 26 mm mikunis.
  6. TreeTopPilot

    4130 tube quality question

    Tail feathers welds...
  7. TreeTopPilot

    4130 tube quality question

    Light sport cub clone from plans. Still concerned over the tubing. Sad thing is the whole tail group is finished. I noticed this issue yesterday bending 5/8" fuselage longerons. So I am in a holding pattern for now. I have 1/4 , 3/8, and 1/2" tube with this pitted finish. some rougher than...
  8. TreeTopPilot

    4130 tube quality question

    The whole unknown issue about the surface voids or divots in the tubing is where the question of it being safe. But reputable streamline tube was pretty bad as mentioned above ($26/ ft).
  9. TreeTopPilot

    4130 tube quality question

    I sanded the areas shown with 320 sandpaper and polished with 500 grit. Here is 10 power pic of Webco tubing.. Very difficult to illuminate for a good picture.
  10. TreeTopPilot

    4130 tube quality question

    This is the tube in question. I know there could have been lubrication issues as it was drawn. Seems to be the worst 17 foot example. I have compared surface finishes of Webco, AED, and Plymouth. Some are better than others. I just need to consider if I have poor quality tube which results in...
  11. TreeTopPilot

    4130 tube quality question

    This is 4130 streamlined tubing from acs
  12. TreeTopPilot

    4130 tube quality question

    I hated to waste a day on paralysis by analysis. I need help from more knowledgeable . I have issues with tubing from my local supplier. They have given me some tubing that has all the correct heat treatment markings and cond N. Just no mill or manufacture ID. It is pickled and after inspection...
  13. TreeTopPilot

    Tig Setup you use

  14. TreeTopPilot

    Sky Raider/Ridge Runner plans /kits??

    great design...poor craftsmanship in making a...cough...kit Two of the spars I seen were welded....too many issues to even start with what we seen
  15. TreeTopPilot

    Sticker shock!

    Dillsburg--charly voglesong---did sell China origin tube later on near the end of the business. Only reason I know is because they didn't offer certs for the last 6 or 7 years they sold tube....just purchased from Spruce from then on. Plymouth or German tubing....less voids to be concerned with...
  16. TreeTopPilot

    Ridge Runner 1?

    I hope this gets resolved for you. I am also bound by my lawyer by what I can state. There is a dark cloud building around this......
  17. TreeTopPilot

    be aware:

    From the last shipment that was reported to be of Chinese origin with no certs available..........
  18. TreeTopPilot

    TIG or gas welding...

    Some of my unfinished rudder and brake pedal units.... .375" and .500" x .035" wall molly. Weld should have some colors to them with no grey burnt areas at all. Machine set to 100 amps..... use your foot pedal !!!!!!
  19. TreeTopPilot

    TIG Filler for 4130…

    Learn to use the foot pedal control for amperage. ER70S-2 for molly. Take your time and weld slow........and lots of practice.
  20. TreeTopPilot

    Engineering question - Heat and 6061 T-6

    I have a set of wings based on a tubular aluminum spar....old Avid wings. The issue is that a propane torch was used by the previous owner to un-glue a gusset near the spar attach fitting. I didn't think of it until after the purchase was made. After some thought and research about the situation...
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