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    P-51C at ~70% scale as ultralight?

    Colin Thatcher designed CX wings for his favorite style of flying: docile. Since he wanted to make the airplane easy to fly - for low-time pilots - so Colin designed for a slow roll rate. Pilot reports also concur that CX-4 is one of the most docile tail-draggers. In conclusion, Thatcher's...
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    Flaps or flaperons

    " " Yes, Ellipse has a beautiful wing, almost elliptical. To be precise, Ellipse wing is almost the same planform as the Schumann wing favoured by modern sailplane and Formula One racers. All the taper is in the gracefully curved leading edge and the trailing edge is almost straight. Dean...
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    Very low aspect ratio planes?

    The Delta Stingray was an 80% scale based upon the Dyke Delta. Lowell Borchers devoted 6,000 hours to building it 70% plywood, 20% Douglas Fir with the last 10% being a mixture of fiberglass and metal. It won a designer's award at Oshkosh 1980. Wing span was 15 feet, and length 14 feet. Empty...
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    Sheet Metal Engine Mount?

    Even the gentle curves of a Bulldog fuselage will stiffen skins and reduce "oil-canning." A friend flies his Zenith 601 up to 600 hours per year. After a few years, he had to replace flat skins on the aft fuselage because of fatigue, smoking rivets, cracks, etc.
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    Flaps or flaperons

    Dear Revan, From the opposite perspective, ailerons that droop with flaps provide a shallower angle of attack for the outer wing panels. Most of those STOL planes don't droop ailerons as deep as flaps. For example, flaps might droop 40 degrees while ailerons only droop 30 degrees. This means...
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    Scale B&V P111 anyone?

    Dear Cluttonfred, You don't even need to build an assym' horizontal tail. The first version of Blohm und Voss' 141 had a horizontal stabilizer that was symmetric about the center-line/thrust-line of the long boom. The production version only had an assym' horizontal tail to clear the field of...
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    For those with an interest in the Goodyear inflatoplane.

    Over on www.secretprojects.co.uk, we have a thread entitled "Goodyear's Inflatoplanes" in the after 1945 forum. We discuss Goodyear's efforts along with Taylor McDaniel, Pavel Grokovsky, Prospect Designs, the British Inflatoplane ML Utility Mark I, etc. Personally, I would like something...
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    modern equivalent to doped canvas?

    Caution: Most of the fabric currently sold as "ballistic cloth" has diverged from the original Military Specification for the ballistic nylon that was used in flack vest. MIL SPEC C-12369, Ballistic nylon cloth weights 13.5 to 15 ounces per square yard. It is woven 2 by 2 of 1000 denier thread...
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    For those with an interest in the Goodyear inflatoplane.

    Dear aircar, The Swiss 'manta ray' was built by Prospective Concepts. Plenty of photos and explanations on their website. They also built a more conventional inflated ultralight. Other inflatable airplanes have been built in America (1930s), Great Britain (1950s) and Russia (1930s),
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    Very low aspect ratio planes?

    Dear Cluttonfred, Junkers flaps and ailerons work best at low airspeeds. They remain effective at low air speeds because they are outside the turbulent boundary layer. All control surfaces work best when hinge lines are perpendicular to air flow. IOW controls work best when hinges parallel the...
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    Scale B&V P111 anyone?

    Good point! One wag sketched a (ficticious) Grumman Goose with only one engine. Frankly, that is the simplest way to understand Dr. Richard Vogt's assymmetric airplanes. Think of them as twins with only one engine producing power. Then determine which propeller blade is descending. The...
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    Flaps or flaperons

    OP, the primary reason for all drooped outer leading edges, slats, slots, vortex generators, wing twist, etc. is to reduce the angle of attack of the outboard wing (aileron territory) so that outer wing panels retain smooth airflow after the center section is stalled. This helps maintain roll...
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    Flaps or flaperons

    A the other end of the complexity scale, a Russian discoplane only used cables to operate a pair of elevons. Rudder cables were separate from the "mixing" mechanism.
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    What do you say...?

    Too true! Back during the 1980s, I sewed together a couple of kit parachutes. The kit-seller promised a 20 hour build-time. Hah! Hah! I probably spent 20 hours just re-reading the manual plus many more hours sewing. That extra time was worth it, because both parachutes flew straight on their...
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    A solution looking for a problem

    You are correct. Myth Busters built a square, cubic lead balloon.
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