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  1. A

    Airframe from non-aircraft grade material.

    I'd use details that are sized for the loads, not scaled because the airplane is smaller.
  2. A

    Airplane Wanted Looking for American Eaglet sailplane or other ultralight sailplane (entire airplane or plans)

    Anything is a better choice than the Eaglet in my opinion. Hunt down a Monerai with spars that did not have the lightening holes cut. Then fly it at handbook gross weight.
  3. A

    Airframe from non-aircraft grade material.

    Completely erroneous thinking. Fatigue occurs at low stress levels with lives dependent on the number of cycles, stress ratio, and stress concentration. (Those are fundamental first order factors.). Static strength and fatigue must be considered. I wonder whether you have any understanding of...
  4. A

    Airframe from non-aircraft grade material.

    That's a table of possibilities. The odds that the entire list and every alloy is in stock is zero, and close enough to zero for any given alloy. I wouldn't begin to contemplate any 300 series in annealed condition.
  5. A

    Old Blanik L 13 Glider

    Calculating fatigue life is folly without at minimum two bits of information - a plausible load spectrum and a full scale long term test. Without a test following that spectrum a scatter factor on life is required, something between 2 and 4 times the guaranteed life. Besides that the life...
  6. A

    Old Blanik L 13 Glider

    Cut the wings off. Add two jet engines. Put fuel in the aft cockpit. Call it the Jetnik. Or, Blajet if you cut the wings too short. Paint it red, too.
  7. A

    Units in Design

    Thermodynamics, fluid transport, heat transfer, aerodynamics, and others apply pounds-mass, pounds-force, and slugs. The weights guys use slugs. Non weights designers on advanced programs are likely to use pounds-something, and the strength guys in my group had better check the numbers before...
  8. A

    Units in Design

    Ages ago the founder of Sverdrup Corporation told us a mass flow measure he invented. The Gulf Stream is something like 12 Sverdrups. An odd case in a paper about orbital mechanics that included a "hurds" unit. I don't think anyone really nailed that one down, and we had three or four premier...
  9. A

    Airframe from non-aircraft grade material.

    Crippling lives on the left hand side of this curve in the transition from short columns to block compression. Crippling stress is not constant at compressive yield, the mode starts at stresses less than yield then continues to a cutoff at ultimate allowable stress. Whether you should use...
  10. A

    Airframe from non-aircraft grade material.

    Buckling in this truss context is defined by three subcategories, crippling, short column buckling, and Euler buckling. All three are functions of material gauges and Young's Modulus, and the first two are functions of compressive yield and ultimate strength. The trick with Euler buckling is...
  11. A

    Airframe from non-aircraft grade material.

    All of the 300 series (18-8's in obsolete descriptions) steels are strengthened by work hardening, and the same room temperature allowables are applied for each condition for all of the alloys. The usual designations in aerospace are still annealed, 1/4 hard, 1/2 hard, 3/4 hard, and full hard...
  12. A

    Ferrying an EAB that has current airworthiness documentation and out of phase 1

    Your wife will build time as a mechanic, homebuilt airplane troubleshooter, and homebuilt airplane completer. Build time in the BK after obtaining the private pilot certificate and more experience while she is learning how to fly.
  13. A

    3D printed Carbon Fiber Wing Ribs???

    Not until Z direction properties are fixed by sintering or a similar process. The carbon fiber bearing filaments are no better than cast products. The filaments are very short, tied together only by the matrix, and mostly good for marketing. They have no bearing on Z direction adhesion.
  14. A

    Extra holes and how to fill them, or should you fill them?

    In a tension dominated cross section rivets do not reduce the net section stress. They are cosmetic. There is a minor improvement in fatigue life due to hole propping at the sides of the home 99 degrees from the line of the through load, but mostly the repair is cosmetic, especially when the...
  15. A

    Stainless -aluminum glue ?

    A sluice box? Stick it together with auto trim or contact cement.
  16. A

    Concepts only: Doodles without numbers

    No taller than the vertical tail.
  17. A

    10 lbs

    You can't be helped without a better definition of this mission. I only care about the imposition of the physics, and you can't get around those rules. Start with a 10 pound payload and estimated 25 pound gross weight. Then apply the cruise speed required. Estimate the drag, estimate the...
  18. A

    Pilot training - the good, the bad, and the ugly

    The number 1 deficiency in flight instruction is assuming the student has sufficient knowledge and mastery of a topic. The written test results are not the right measure, only one on one quizzing and demonstration is the way. Number 2 is probably understanding airspace and the depiction on...
  19. A

    Ref for Using C/S Machine Screws to Attach 0.016" Fuselage Skin?

    A fastener pitch of 16 times the screw diameter (2.25 inches) would be a good place to start. That allows installing additional fasteners at 8D or down to 4D if needed at the ends. I'm not crazy about using fully threaded screws and putting threads in bearing in the substructure or the skins.
  20. A

    Sparlite 52 pultruded carbon fiber strip

    The real world does not operate on 10's; simple measurements are trivial. Here's an example of a simple physical calculation in SI - Consideration an object of mass 73.53 kilograms accelerating at 49.1 meters per second squared : The force required to produce that acceleration is F= ma =...
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