-we have some problems with polish-english translation...Hello Henryk,
Thanks for the notification. I'll try to look at it this weekend. I have been very busy with renovations... lots of plastering, sanding, painting, and am pressed for time right now.
I will try to modyfy KASPERWING=no wires\only struts\,main tubes\50*1 mm\,sail under 50g/qm,light ribs and new rudders...=circa 15kg. +very light electric motor,footlaunching.Thanks, HenryK for all the great work you are doing.
I'd love to here about the recent progress you're making.
I've been planning to build an up-to-date version of the Kasperwing with a lighter, sleeker structure and improved aerodynamic/aeroelastic properties.. if only that dang earning-a-living thing weren't taking up so much of my time :dis:
=MY COMMENTS...15 kg sounds INCREDIBLE, Henry!
=BUT REAL,WITH MODERN TECHNOLOGY and MATERIALS\V-STRUTS,WITH LIEBECK AIRFOIL\...
=EL.MOTOR+CONTROLLER=2,5kg+BATTERY=ONLY FOR TAKE-OFF.
My thinking is that a single composite spar at ~25% chord could replace the double aluminum spars & compression struts.
Composite ribs would have to be rigidly secured to the spar, which has to be rather rigid in torsion.
Only one-fourth as many wires should really improve high speed L/D
I still like the single surface airfoil arrangement with the sharp LE
=SHARP LE HAVE "ZENITH CX"-HANGGLIDER...
, but a more conventional double surface may be necessary if the trapped bottom surface vortex drag reduction doesn't work as well as Witold claimed
=SEE LEFT WING AT PICTURE 12...!
danmoser; but a more conventional double surface may be necessary if the trapped bottom surface vortex drag reduction doesn't work as well as Witold claimed .[/QUOTE said:Kasperwing ultralight aircraft, Kasperwing experimental aircraft, Kasperwing experimental light sport aircraft (ELSA), Lightsport Aircraft Pilot News newsmagazine.
=see greater picture=before spar pocket we can see NEGATIVE pressure region=bottom LE vortex!