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    Holes in Spoiler or Not

    Billie, the Tut team? We're you at the Region 9 championship at Stamford NY back in uh, darn, I forgot the year.?? '78? If so, I probably was your wire man, or landing zone judge. Cloud suck can hit anyone. I nearly got sucked into a thunderhead at Honeoye Lake when it came over the back...
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    RoofTop Scale testing

    Northwing & the other U.S. manufacturers mount the glider rightside up for the positive load testing, and stability testing and the negative load testing as well. The design of the hang point, at CG, is much easier to access from the underside, where the pilot hooks in. And, yes, Sometimes the...
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    Very low aspect ratio planes?

    That just begs to be painted with false perspective lines, or even an Escher style impossibility. spell check is the sewn of satin!
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    Build your own HO229 WW2 German Jet Fighter!!

    Yep. Unless you design a wing you can change the washout on in flight, you're going to be optimized for a narrow range of flight. Just like every other aircraft. A segmented flap system ( or flexible... Oh my aching head on flutter calculations ) can simulate wing twist, at a cost in drag...
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    Build your own HO229 WW2 German Jet Fighter!!

    My personal preference for rigid swept flying wings is vertical tip rudders. ( out only drag effect rudders ) As used in many Rutan designs. Partly because it's easier to build than Northrop style clamshell drag rudders. And if designed as part of a winglet, offers reduced drag. Even the...
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    No one can explain WHY planes fly...

    Air goes up, air goes down. You toss a brick through the air, it moves air in all directions. ( and in a constantly changing amount, it it's tumbling, and it will ) It's the sum total of the induced movement of all the air that is measurably affecting the object that we care about to get & stay...
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    Air Cam / CH-750 love child ....

    http://www.bushplanedesign.com/
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    No one can explain WHY planes fly...

    You are over thinking this. "How does a pressure wave pull? Normally a pressure wave pushes outward. Perhaps a low pressure wave?" Momentum carries a high density area through space, leaving a partial vacuum... a lower pressure wave behind. "Because atoms resist being pulled apart?" Not...
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    No one can explain WHY planes fly...

    Gravity is said to be an asymmetric force. It only pulls. Or curved space. We don't really understand it, we just have theories we like for their elegance. Mass pulls mass. Why? Uh... How about...Gravity is a Repulsive force. It pushes. From all directions, from the expanding shell of the...
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    AIR ATOS Wing - 3axis from a trike wing

    But the aluminum tubing frame on many ultralights are under the fabric, usually a sewn envelope. During a thorough preflight you can run your hands over the leading edge and feel for dents and breaks. I don't do it every time, ( but most times ) when folding up a hang glider, or preflight on a...
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    Very low aspect ratio planes?

    The disruption in laminar flow and other things like wing strake vortices is momentary as the prop wash flows act from a tractor prop. The later is visible in humid air sometimes.
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    High aspect ratio wings

    It's also cheap, and a familiar construction technique for hang glider holders. Same tools and shop needs. The "practical" part... It's a compromise. Price, weight, performance. The hang glider version of the Quicksilver had a higher Aspect Ratio than the later commercial Ultralight powered...
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    No one can explain WHY planes fly...

    Interesting, but at hang glider and 747 scale electrical forces don't dominate, much less measurably contribute. ( correct me if I'm wrong ) "Gravity is millions times weaker at atomic distance." Really? Or is it that other forces only work at short range or fade very quickly with range...
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    High aspect ratio wings

    Ultralights, in the U.S. pt103, are constrained by weight limits more than anything else. That's why all those draggy wires are still used, you get the lightest weight for the size with external wire bracing. ( although with carbon fiber you can get pretty light with a cantilever wing... at a...
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    No one can explain WHY planes fly...

    See? Gravity! The above folk are correct. Air molecules don't have special attraction, electric, strong, weak, whatever force. They bounce around. Any nuclear effects are frankly unmeasurable outside a special lab. If then. Gravity dominates on the scale we live in. That's unless we're...
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