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  1. A

    Another Stolen from XKCD

    NYU study from the 1970s, driving cars through a cone & signal course with various levels of intoxication. Don't recall the graduations but from "I can feel it" to "wasted". Alcohol and marijuana tested. With both, "wasted" was disastrous driving, no surprise. With alcohol, performance...
  2. A

    Shimming ultralight tube “sleeve” doublers

    Always cut slits w/drilled stop holes in internal sleeves to spread the end of sleeve stress riser. With .058 thick outer tubing it's a tight enough fit. For drilled holes, I drill & deburr outer tube, insert sleeve ( marked with permanent marker around O.D. @ centerline to locate sleeve...
  3. A

    part 103 electric motor battery allowance?

    Just have a tiny battery pack strapped to the frame, and wear the main battery in a vest or back pack that is buckled to your seat, if any. Might as well design it like a paraglider harness/seat and save empty weight and in most cases, be more comfortable without a heavy seat other than a...
  4. A

    Swept Back vs. Swept Forward Flying Wings: Which is Best?

    Not all rear swept wings have down load on the tips due to washout. My various hang gliders with washout minimum limit devices lift all the way to the tip in cruise. Apparently it's the lift vector on the washout tips that gives pitch stability. Not "true BSLD" but in that area. One of those...
  5. A

    Stolen from XKCD

    And for the geeks among us.. More information at... https://www.explainxkcd.com/wiki/index.php/2678:_Wing_Lift Real flame fodder on how lift works! Our most popular argument.
  6. A

    Stolen from XKCD

    There is a "mouse over" hidden caption on these 'toons on the original website. https://xkcd.com/2678/
  7. A

    How Lockheed Martin Designed the World's Weirdest, Quietest Supersonic Jet

    There was a hypothetical no-boom concept that used a laser to ionize the air in front of the plane. Never built, probably because someone realized the heat problem from flying through plasma before you even got to friction heating. A similar concept for high speed rocket torpedoes was talked...
  8. A

    Identifying Unusual-Sounding Aircraft

    Local Mercy Flight had BK-117, Messerschmitt choppers, which are very distinctive in sound. I used to work under their approach path to Strong Hospital. Could tell which was flying over easy. The local Army Reserve has Blackhawks and Chinooks, also unmistakable.
  9. A

    Slice & Dice a few 2nd Lieutenants

    "State of the Art!" Luckup Corporation
  10. A

    Anyone seen my F-35?

    As I walk through the valley of the shadow of death, I remind myself to not trust Google Maps.
  11. A

    Why no four seat powered pargliders?

    I don't see a big market for it, but it's technically possible. I agree to the above comments on needing a PSRU, and control throw/leverage/gearing is going to be challenging, but I bet you could make one. As a Experimental, some things, like making a rib, can be done once by the builder, as...
  12. A

    Most Beautiful Aircraft Ever Built

    https://en.m.wikipedia.org/wiki/Nieuport Eye of the beholder applies. Personally I think the square fuselage V strutters were "cute" and they make for quick building replicas. But the 4 spar 28 is "handsome" and historically interesting as the unwanted plane given to the American...
  13. A

    Why does the Cub have jury struts?

    To be fair, the plane was below me and I had a great view of the very smooth landing. All the other jumpers were also below me, First out, last down. Well, you don't want to walk far, especially with a parachute wadded up in your arms. But I have jumped miles from the airport, deliberately, we...
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    Why does the Cub have jury struts?

    I've commented before on the hierarchy of crazy. Each layer thinks the one "below" it is nuts. People order the layers according to their own experience, but generally... Airline pilots GA pilots Acro pilots Glider pilots Hang Glider pilots Paraglider pilots Skydivers Base Jumpers Wingsuit...
  15. A

    Why does the Cub have jury struts?

    While I have jumped from a plane when the engine quit, it was already at altitude, and the door was in the hanger. That's just luck. Getting the door open on a Cessna 182 after the wing folds up isn't a trivial matter.
  16. A

    Aerostatics not Aerodynamics - Mystery of Lift Solved

    I thought they established this at the Council of Nicaea?
  17. A

    What if the B-70 was a passenger plane?

    The author of the MASH book series ( the original made into a movie and tv series is just the first ) had the semi fictional aircraft owned by hyper rich folk, a joint venture of France and Britain, unprofitable and... Named Le Discorde.
  18. A

    Use MOGAS? Watch This

    Tip on ultrasonic cleaning! If you run the cleaning machine with your fluid of choice ( note 1 ) EMPTY of parts for half an hour, you de -gas the fluid so invisible air bubbles don't absorb the energy. This GREATLY reduces time needed to clean parts. From hours to fractions of one. ( this...
  19. A

    Use MOGAS? Watch This

    I run ethanol free 91 octane in my motorcycle unless I have no choice, then I make sure to drain the 93 octane car gas before fall storage to burn in my car, and fill up with 91 no booze. Starts fine each spring. High compression engine and after a 3 year layoff ( before the New Titanium...
  20. A

    CONTROL WING TRIKE

    https://www.homebuiltairplanes.com/forums/threads/what-do-you-think-about-e-soaring.17114/page-268#post-780781 Atos with stick. That uses cables to tilt the wing in pitch... tilt the trike in pitch... depends on the reference planes and how affected. The wing tilts on the ground, while the...
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