Quantcast

Recent content by peter hudson

HomeBuiltAirplanes.com

Help Support HomeBuiltAirplanes.com:

  1. P

    Airfoil 450 gross, 100 sq ft. , 14%, USA35B, Clark, or Rag Wing?

    103 calcs for stall speed allow you use a CLmax of 2.0 if you have 50%+ flaps. At 450 lbs and a CL = 2.0 you need 115 ft2 of wing. You're not FAR off, but with a CL of 2.0 and only 100 ft^2 your stall is at just under 30 mph. One thing to consider though, is the stall speed in part 103 is for...
  2. P

    FAA written exam / gliders

    They have no problem with my flying skills and do want me to play with their balls (that didn't sound right). But they want to make sure it's done per the FARs. The only extra bit is them wanting me to get more than the required solo flights but really that's just me flying around which is the...
  3. P

    FAA written exam / gliders

    Thanks Jedi, That just leaves whether I meet the FAR definition of student pilot... I may have to submit a request for a student pilot certificate per 61.85... unusual for a licensed pilot but perhaps the best workaround. I appreciated you input on this. Thank you.
  4. P

    FAA written exam / gliders

    I argued that, technically, I already meet the requirements for the glider rating check ride (PPL and dual and 10+ solo flights) but since they were so long ago, the organization I'm training with wants me to repeat some solo flights to satisfy their insurance requirements by sticking with their...
  5. P

    Airfoil 450 gross, 100 sq ft. , 14%, USA35B, Clark, or Rag Wing?

    At 27.6 MPH (sea level on std atmosphere) dynamic pressure is 1.95 lb/ft2 so you would need a CL of 2.3 which is a pretty big number!
  6. P

    FAA written exam / gliders

    I'm in the same boat...had a log book from 1975 (when I was 14-15) with 2-33 and 1-26 time. It was hard to pay for those flights mowing lawns, and when a local shop opened building hang gliders, I went straight to work for them, and flying HG, and never finished the sailplane ticket. Now I'm...
  7. P

    Klingberg Wing is almost ready to fly

    OK, that made me laugh...Yes it's a very small community and one would think we would all hang around drinking beers and comparing notes with each other. (at least figuratively as we do on this forum)
  8. P

    Klingberg Wing is almost ready to fly

    I was referring the the Klingberg Mk1 crash. I don't know for sure what happened with the Prandtl. I think they just stopped testing it without suggesting a reason why. Maybe some concern over the structural integrity of the pilot cage? Maybe just too heavy to foot launch? Maybe some votes...
  9. P

    Klingberg Wing is almost ready to fly

    Interestingly, he has the same complaint about not getting his contacts returned to participate in the man-carrying Prandtl wing tests out at El Mirage. Maybe you got him While he was still reeling from it's crash? Or when he was having some heated Email battles over his model wing?
  10. P

    Klingberg Wing is almost ready to fly

    Funny that's one area we discussed a lot when I made the model. I had to make a special "plug-in" to get the "auto-yaw" per his design. The model flew worse. I did some force and moment calcs for yawed positions with and without the free trailing rudders and decided that I disagreed with his...
  11. P

    Klingberg Wing is almost ready to fly

    One can choose to model a yawstring but with the steep angle of the windscreen on this one I didn't think it would work well. Plus, Rol is not currently planning to have active rudder control, so a yawstring would tell you about things you cant fix. I think the rudder control will be something...
  12. P

    Klingberg Wing is almost ready to fly

    As Rol Klingberg is wrapping up his build and getting ready to test, and since it's Christmas time, I thought it was a good time to share my X-plane model of his new MKII wing. https://forums.x-plane.org/index.php?/files/file/68335-klingberg-wing-mkii/ ..and a short video on how the special...
  13. P

    Testing XPS foam for epoxy adhesion/bonding

    As we strive to reduce the amount of foam with thin ribs (which is a good goal for weight savings) it starts to make the skin to foam bond more important. AND as Vigilant1 points out it adds a little peel to the bond at the corner of the ribs. In keeping with this thread's title; what test...
  14. P

    Testing XPS foam for epoxy adhesion/bonding

    I think that's a good point in that the skin to foam bond's shear strength, and flat-wise tension is what should be tested rather than peel. If it is consistantly better than the foam shear and tensile than it's as good as it will ever perform.
  15. P

    openvsp to x-plane

    Hi All, I made a video about using OpenVSP's eport to .OBJ as a way to (relatively) quickly get your concept into X-plane to do some decision making on configurations. I hope you enjoy, -Peter-
Top