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Downtube.jpg
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17 Comments

  • Paul Hamilton
    by Paul Hamilton 9 months ago
    Trainer bar attachment to downtube. Huhhhhh. Never saw this before....
  • Henry Trikelife
    by Henry Trikelife 9 months ago
    Making a hole on one of the most important component of the wing. That's insane.
  • Leo Iezzi
    by Leo Iezzi 9 months ago
    Not good.....
  • Andy Hughes
    by Andy Hughes 9 months ago
    So this person who has done this to an aircraft is an instructor? If so what is his/her name. Only asking as the student who is unknown to a certain level of quality instruction and professionalism may feel that this is acceptable. The experienced flying community knows better. If this was a joke post to get responses then fine, if not then "out" the person as a matter of safety, as this is a close net sport. Last thing our sport needs is a person with no regard for his or his students. Andy.
  • Gary Crayne
    by Gary Crayne 9 months ago
    I hope they’ve practiced a quick positive transfer of controls. They’re going to need it.
  • Scott Williams
    by Scott Williams 9 months ago
    As long as a BRS is installed everything should be fine... totally fine
  • dave kempler
    by dave kempler 9 months ago
    I love coming to TPS only to see that my trike has been benevolently vandalized by someone who was trying to do something nice, but did not follow basic instructions. This installation was certainly not authorized!!! The person who did this is not an instructor and will likely not do something like this to another trike. Needless to say, I'm furious. Thank You Paul for posting the photos and the warning.
  • Paul Hamilton
    by Paul Hamilton 9 months ago
    I would not fly it that way. We all have done some less that perfect work on trikes sometime. :-) We hope a basic preflight and/or a second set of eyes is helpful.
  • Andy Hughes
    by Andy Hughes 9 months ago
    kind of a drag posting it here before you talked to him. Makes him look like a total looser when he didn't even know it was done to his machine.
  • wexford air
    by wexford air 9 months ago
    Yes that repairman surely needs to up his game, any yob would know that you should see 1.5 screw threads showing through the nut! Tut tut.
    Look on the bright side Dave, at least it's shiny.
  • Paul Hamilton
    by Paul Hamilton 9 months ago
    Hopefully everyone takes this as a learning experience.
  • George Sychrovsky
    by George Sychrovsky 9 months ago
    I would not do this myself either, but I believe you are overreacting and to the actual safety this is about as dangerous as cutting off the mattress tag.

    But what do you think about this guys down-tubes "modification" ???

    https://www.youtube.com/watch?v=0XZrXSMDCC8

    starts at 1:50
  • scott smith
    by scott smith 9 months ago
    Well I'm going to be careful here because I'm not any kind of engineer or designer but I do know that holes are routinely drilled into semi trailer frames for the purpose of making them stronger. I would think that in order to be effective though the hole would need to be in the center of the piece in question. I also question mounting any hardware to it
  • Joe Hockman
    by Joe Hockman 9 months ago
    Interesting, I guess I really don't have a big issue with a single bolt hole through the trailing edge of the downtube as long as the wing is controlled by the control bar. However point lateral loads on the down tubes by quick roll maneuvers from the rear seat through the instructor bars may not be the best idea. Anybody ever remember the little stunts we did when we were younger like standing on an empty aluminum beer can on one foot and then having somebody tap the side of the can. Might be a good little demonstration for the owner of this trike on how compression force can compromise a structure with a minimal concentrated lateral force.

    George, I for one have serious concerns regarding the downtube modifications shown in the referenced video link. The question is how will those "supported" downtube elbows respond under various loads including potential shock loads during turbulence.
  • wexford air
    by wexford air 9 months ago
    Don't forget Joe that most of these downtubes nowadays are connected at the hangblock and need to be able to move at the control bar junction. If this is one of those wings then there doesn't need to be any control inputs through the training bars to put stress into the downtubes. It looks from the photo that the tightening of the bracket had already damaged the tube anyway so it's ready for the next step, failure in compression!
  • Joe Hockman
    by Joe Hockman 9 months ago
    Good point Wexford ! Any way you want to look at it, the integrity of the down tubes may be the most important structural item under compression. Yes cross bars are also under compression but they are usually quite a bit larger diameter tubes. I personally would feel a bit more comfortable if those down tubes were replaced.
  • Paul Hamilton
    by Paul Hamilton 9 months ago
    By the way "Monty gets the award for an innovative option instead of the hole through the downtube, "duct tape it on, less intrusive".

    What is interesting about this mod is that no one seemed to catch one of the most important aspects of this mod. The other photo of the BOTTOM part of the mount. In my opinion the bottom is a bigger problem, weak in lateral strength. I think Larry caught it with his comment.....
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