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So when people talk about a Supra (glider) it could mean a lot of different
things. Different fuses and lengths, different airfoils, different
wingspans, different wing construction (bagged or molded), etc...
Yeah, and other things too. Like different linkages (the Drela design uses
RDS for ailerons and flaps, but I don't think Keisling and Barnes use them).
I can't comment much on the molded supra. But I am a big Drela fan and
consider myself a builder of 2 of his designs (Allegro Lite and Bubble
Dancer). If you go to the Charles River page, you will often see that Mark
lists alternate ways to do things, so you can in fact build one of his
designs several different ways. It is possible no two Bubble Dancers or
Supras are alike. That is one of the things that I think make his designs
popular. Guys get to chat about how they went about building his designs.
I think the one constant thing in the Supra is the airfoil (the Kennedy
version, the Drela version, the wings Phil makes, and I think the Thermal
Dancer all use the AG40 series foils) and that the Supra wing and model is
specifically designed to handle F3J launches and that the model is designed
for F3J flying. In reality, the Drela Supra is really quite similar to one
of his earlier designs, the Aegea (remember the guys using the Barnes Aegea
wings on Ava fuses last year, although the Barnes spar is a lot different
than Mark's spar design). The spar was changed a bit on the Supra to be
more twist resistant for high speed F3J launches (no sweep in the spar).
The horizontal tail had the "sub rudder" removed to avoid a possible "rule
issue" in F3J. The boom is supposed to be even stiffer. Things like that.
Confusing/fun, eh?
My winter project is a 2 meter Aegea wing to fit my Allegro Lite fuselage.
And, if I have time a second fuselage.
Ryan
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