|Jan 25, 2014, 09:24 AM|
Joined Jan 2014
rc kite indoor
this is my first thread...excuse me it i am not familiar with any rules...
first: enjoy the flight and look at this:
second: any proposals how i can get longer flight times and any ideas about a better sail - cut
other comments are also very welcome
thank you and i look forward to get knowledge about YOUR rc-kite-projects
|Feb 01, 2014, 12:03 PM|
San Bernardino, California, United States
Joined Oct 2004
Your kite seems to me to fly very well.
To get longer flights you will need to reduce the amount of power required to maintain flight. So you definitely need a better sail cut to reduce drag and increase lift at the same time.
In the 1970's we used to adjust the sail shape of our hang gliders, by "bowing", or bending the leading edge tube. This tube is the equivalent to the mast of a sailboat, and sailors can "tune" the shape of the sail by bending the mast in various ways, most usually by tightening or loosening the cables that brace it.
Sailboats usually have what they refer to as "spreaders" mounted on the mast near the halfway up point. 1970's era hang gliders used them also, but we called them "deflexors".
By adjusting the tension on the cables that go from the nose, over the end of the deflexor strut, and then to the tip of the wing leading edge, you can bow the tube forward and create a "camber pocket" in the sail right behind the leading edge.
Modern hang gliders no longer use deflexors. We now cut the sail panels so that once sewn together, a "luff curve" is created in the sail that allows for the amount of bending that the leading edge tube is expected to do when under load.
Also, tubular aluminum "ribs" or "battens" are inserted chordwise into pockets sewn into the sail, these define the amount and location of camber and/or reflex.
I recommend that you research Windsurfer or sailboard sails, also Hang gliders.
For your kite sail, remember that those "pointy" wing tips are draggy. Look at the "roached" tips on windsurfer and hang glider sails. Increase your aspect ratio, this will also improve your lift to drag ratio. Use the lightest possible frame tubes and sail material, a very light airplane can get by with very skinny frame tubes and very light plastic film sails.
What I like about using "kite" technology for airplanes is the possibility of achieving very high wing area amounts with minimal frame parts count and weight. Every time I go hang gliding I am amazed at how well my Sensor 610F flies, especially considering it's weight and how it all folds up into a bag and rides on the car. I think it will be possible to adapt the structural technology of hang gliders to RC airplanes to allow for a very large airplane that folds up into a cardboard tube.
Good luck with your project.
Yours in Flight, Steve
|Feb 03, 2014, 11:16 AM|
Joined Jan 2014
so many things to keep in mind
thank you for your answers.....they are really very helpfull...
now it gets really deep in knowledges about luff and wingtips....
it is very interesting to "copy" ideas from other sailsports...
i try to sew a new sailform...and to test it...
have good flights with your sensor
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