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  1. F

    Brake line fittings

    Thanks guys that is the PERFECT information. I will make a tool like the one shown to apply more pressure and give it a twist. I was just reluctant before to apply much force, not being sure of the correct method. Looks easy, I will give it a try next time I'm at the hangar!
  2. F

    Brake line fittings

    It looks like that fitting. It is not used on air, as can be seen in the photo it is 5606 hyd fluid. It is not even under pressure as it is just the line from the reservoir to the cylinder. Any idea on how it releases?
  3. F

    Brake line fittings

    Is anyone familiar with the fittings in the attached picture. I need to change the length of the brake line so need to disconnect and reconnect these fittings but I don't know how they work. They are not such that they will take a wrench and pushing in on the "collar" does not seem to do...
  4. F

    Lift Strut and Cabane Strut loads

    Ahhh yes Bob, that makes sense. At Va the lift cannot exceed 100%. I guess at higher speeds it could, but then it would also be exceeding its rated G limit. In many parasols the x wires between the cabanes are only on the front cabanes, either crossed to the other cabane or down to the...
  5. F

    Lift Strut and Cabane Strut loads

    I have began to study the lateral forces on the cabane and lift struts. Part 23 Appendix A states that for Normal and Utility Categories the wing and carry through (center section in my case of cabanes) must be designed for 100% load on one side and 70% load on the other side. The attached...
  6. F

    Lift Strut and Cabane Strut loads

    Attached is my attempt at computing the loads on the Lift and Cabane struts of a Pietenpol at 15 degrees AOA and 4.4 G's. Still lacking is any asymmetrical lift loads (which I don't think occur if not "rolling" and anything I am still not aware of.... Comments and corrections invited!
  7. F

    Lift Strut and Cabane Strut loads

    I think one thing that is tilting your meter is that I am putting the original forces (lift and drag) on the diagram together with the "vector components" and I now think that is not typical convention in such drawings. It makes it look like the forces are all there twice. But again, I don't...
  8. F

    Lift Strut and Cabane Strut loads

    If referring to the lift at the leading edge of 67 LBS it is just the lift that is carried by the drag truss and the 931 is the lift that is carried by the spars in their designed axis. Putting it at the leading edge probably makes it look like it would cause pitching up of the airfoil but I...
  9. F

    Lift Strut and Cabane Strut loads

    Bob, I've thought about what you described and (I think) you're exactly right. It appears I stumbled at the finish line in my "lesson" on anti-drag. I have revised my "Understanding Anti-Drag" lesson and it is attached again here. Hopefully it is better now. Thank you for your contribution...
  10. F

    Lift Strut and Cabane Strut loads

    Billski, That was an excellent description that should be in a textbook somewhere. I copied it to put in my notes on this project - it should not go to waste. However your explanation was not contrary to what I understood from the original sketch you provided from which I was able to...
  11. F

    Lift Strut and Cabane Strut loads

    Well I think I understand this now. I had quite a few major errors in my previous submission on this. Billski's simple diagram showing how wind tunnel data is measured and how this applies to a structure really got me started down the right path. But still I had a real problem not...
  12. F

    Lift Strut and Cabane Strut loads

    Thanks a lot guys. Yes, that helps! Suddenly it is all falling into place - I think. I just have one more bothersome element that is "not conforming" to my mental model. I will soon post a revised version of this segment of the analysis. I think I'm just a couple steps away from the...
  13. F

    Lift Strut and Cabane Strut loads

    I just realized that in the hi alpha example I failed to use a Cl and Cd that are practical for Hi Alpha so the product numbers will be unrealistic but given my purpose in this particular exercise is just one of learning the correct methods it should not affect the usefulness in this exercise.
  14. F

    Lift Strut and Cabane Strut loads

    In preparation for dealing with anti-drag forces I considered a case of slow flight near a stall at 1G. I examined this in the attached diagrams. Some of them may have some things right, but I'm pretty sure some of them have some things wrong as some just doesn't "seem intuitive". I knew that...
  15. F

    Lift Strut and Cabane Strut loads

    I've long recognized and admired the specificity of terms in engineering (and other sciences). Sadly, I don't "speak the language" yet but it is coming to me as I begin to see what is happening and hence, what needs to be described. Thanks for your patience. I really do feel like I am gaining...
  16. F

    Lift Strut and Cabane Strut loads

    Billski, Yes I think the "telephone game" is a good description. At first I understood very little of what you and others wrote and what I read in books. This is because I lacked (lack) the "language" from never having had a physics or statics, etc class. You tried explaining things in a...
  17. F

    Lift Strut and Cabane Strut loads

    Thanks for the referral Dan. I found an old copy on Amazon. It will be here next week : )
  18. F

    Lift Strut and Cabane Strut loads

    Perhaps I explained my understanding poorly. What you said (quoted here) makes good sense (thanks to all the help here over the past 3 weeks or so) and I didn't think anything in my excel sheet or comments was contrary to any of the above. The final statement "Pitching moment gets reacted...
  19. F

    Lift Strut and Cabane Strut loads

    In the attached document I have attempted to correct the situation Billski pointed out where I had "artificially eliminated" the center section from the wing span calculations. In the attached I believe I have made the formula more realistic and then, as suggested, considered the effects of...
  20. F

    Lift Strut and Cabane Strut loads

    For the interest of those following along or that may come along later to try to use this thread for learning: In the last post I attached a spreadsheet showing the forces I arrived at on the lift struts and cabane struts in a parallel strut and V-strut configuration. In regard to the V-strut...
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