Schietwedder wrote: ↑
Fri Oct 16, 2020 11:28 pm
Tube kites on the other hand have less line drag but the profile has a lot worse L/D.
If you look at paragliders and sailplanes, the glide ratio of the highest performing paraglider is at best somewhere at 15 without pilot, maybe even 18 but sailplanes with solid wings easily above 30.
Maybe the best solution is then a high AR solid carbon fiber kite wing with a starting/landing support structure which folds in and minimal lines to control power and twist
Lots of interesting engineering challenges for sure.
Hehe and yes a bit more work and money needed than just a few cool graphics.
Competition Paragliders get their best L/D near (11 to 13:1)
and the best sailplanes money can buy, will get you near 58 to 60:1 , but
competition sailplanes need to turn in thermals, so their best L/D
in around 50:1,(like the ASG 29 :https://en.wikipedia.org/wiki/Schleicher_ASG_29
and my Atos hang-glider clams a 19:1 L/d.
The Real difference between the gliders is the SPEED they get their best L/D
with PG near 20 Kt, Atos at 33 kt , and comp sailplanes at 52kt.
Fastest i ever bin on land, was at Ivanpah dry-lake, with a 2-liner Airush 3m
got me rolling at near 48kt, on GPS , (in only 31-kt wind). It showed me
how much drag those 4-line kites make ; the Airush 3m is Not a very
efficient kite , but had 1/2 the line drag of a 4-liner.
I think Schietwedder is correct with his assessment ; real speed is
gonna need to be done with some seriously efficient wings , (Not Kites)
as we know them now, and the bridle's, are gonna have to go ByBy !
By real speed, i mean 85kt + ; when a kite can get into the Greenburg
numbers of 126mph, (109-kt) , that's when we know were FAST !!