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  1. Jimstix

    Homebuilt Ballistic Parachute

    Parachutes are hard. They look easy, just fabric, strings, and thread, but OMG, getting it right really, really hard. Most of my experience is with the MIL C-9 parachute used in ejection seat headboxes. The parachute is ballistically deployed by a steel mass fired from a mortar. The mass must...
  2. Jimstix

    Pros and Cons on Composites vs Aluminum

    Two contradictory dictums for aircraft structures 1) If it’s made for flight, make it light, and 2) When in doubt, make it stout. It all boils down to choices, all of which have upsides and down sides. For example, aluminum alloys and steel tubing have good quality control with long-established...
  3. Jimstix

    Open Source PSRU Design -- Is it possible without personal liability to contributors?

    FYI, you might want to look up "Dunning Kruger Effect"
  4. Jimstix

    Extra Holes Drilled In MAX Pressure Bulkheads

    In any structure the stiffest component picks up the imposed loads first. Doublers and tripplers are very stiff, so the structures engineer is balancing stiffness and load distribution every time one of these repairs are implemented. If done correctly, the patch provides structural soundness. If...
  5. Jimstix

    Stall Spin Resistance, a call to action...

    Any airplane that can spin, will.
  6. Jimstix

    What's Wrong with Flying Wings?

    All airplane design is hard and flying wing airplanes are harder. In conventional aircraft (empennage in the back) you can get away with all sorts of off-optimum elements and still make the **** thing fly. The margins for error in flying wing design are much smaller. Today, many of the...
  7. Jimstix

    Pushers...way to go ?

    Per post #476, Do-335 with a Tigercat nose and engines from a Me-110? A Tiger Arrow in Italian livery???
  8. Jimstix

    The history of Fox model airplane engines

    I started modeling in the early 1960's with rubber FF (all I could afford). Then on to CL. I had a Fox .15, McCoy .19 and .35, plus the usual Cox and WenMac .049s. Then on to RC in the mid 1970's with K&B .40s and a couple of Supertiger .60s.
  9. Jimstix

    HE-162 information

    IMHO, the He-162 could be made into a fine, modern aircraft - if you change the primary structure to carbon fiber in lieu of wood and aluminum, make it full size, and use a small, modern turbofan engine. As far a drawings, use only the outer mould-lines to keep fedility to the shape. Horrido!
  10. Jimstix

    Single strut or Cantilever Folding High wing designs

    L. Pazmany’s wing folding method on the PL-4A is simple but not very quick. The wing-fold joint is at the dihedral break of the wing. The bending moment is reacted by two removable close-tolerance pins. The pitching moment of the outer panel is reacted by a single bolt in a spherical rod end...
  11. Jimstix

    Maupin Woodstock

    CaptStephan, No luck on this end. As drawn, Woodstock spans 11.9m. Add 43.8 inches to the span (21.9 in per wing panel). My guess is that the 13m mod just added glass-over-foam wingtip. At least, that's the way I would do it and reduce the load limit appropriatly. Jim
  12. Jimstix

    Physical Scale Models for Structural Analysis of Composite Acft: Utility? Scaling Factors/Similitude Considerations?

    If this approach (scale models of structures) was viable (that is produced good data at a reduced price of time and money), the big aircraft and automotive companies would be all on-board. But, they are not. They don't do static and duribilty testing of structures (aircraft) or impact/crash...
  13. Jimstix

    Steel fuel tank?

    Steel fuel tanks have some serious issues including, but not limited to: rust particulates clogging the fuel strainer and carb jets and galvanic corrosion caused by aluminum fittings in contact with the steel tank. Stick with aluminum, it can be welded or sealed and rivited.
  14. Jimstix

    A Good Use for CFD

    Silly me! I thought that all cows were spherical.
  15. Jimstix

    Contra-Rotating Propellers

    Okay, I have to ask: Why do you want/need counter rotating propllers?
  16. Jimstix

    Places to manufacture kits

    Another option, KLRU in Las Cruces, NM USA. We aready have a kit manufacurer at the airport and would welcome another. Las Cruces is a university town with NASA and US Military facilities nearby. Great flying weather, good food, and a low cost of living.
  17. Jimstix

    Fir for Spruce

    Engineering note: Reducing the cross sectional area to reduce weight might work for tensile-loaded members. However, if the part is in shear, compression, or combined loading (and most airplane parts are) you run up against column buckling issues if you reduce the size of of a compression...
  18. Jimstix

    Glider design guidelines

    Per JAR-22, Load factors are +5.3g and -2.56g. Multiply by 1.5 (safety factor) gives +8g and -4g for ultimate load factors.
  19. Jimstix

    Chris Heintz flying on your wings aerodynamic theory

    If your interest is applied aerodynamics, the Heintz book is only a primer. By far, the most readable applied aero book is Fluid Dynamic Drag, by Hoerner. I don't recommend Hoerner's other book Fluid Dynamic Lift. It too is expensive and not a useful as Drag. Another book worth reading is...
  20. Jimstix

    Rocket-powered ultralight (self-launching glider)?

    A big issue is integrating the rocket into airframe.
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