Root : 190 (mm)
SD-6060 (modified E374)
Removable wing tip :SD6060 to modified S-4083
As you can see, the proportions are fairly common, this gives good handling capacities. The fuselage is a bit long with short wings, but that is a good thing for fun flying. And there are removable wing-tips which transform the Excalibur to a calm sailplane that looks bigger than it is.
This wing tips were design so that they don't change the CG location, thanks to the soft "mean aerodynamic chord"
The airfoil, in fact a modernized E374, was choosen for its gentle habits and its habilities to revert flying. I am learning to master negative flight with gliders thanks to my Excalibur.
| It is made of white foam, covered with 1.5mm balsa skin in a vacuum bag. The balsa is
glued with PU (PolyUrethane), instead of epoxy resin usually used. And the concusion is that it works
very well, it is light and strong.
The aileron are quite large, maybe too much on my model : the following will have less large but as wide ailerons. Anyway, they can be used as flaps and airbrake.
The removable wing tip widden the flying enveloppe, so that they become quite usefull as soon as wind weaken, or for thermik flying. They are classicaly built, with ribs and spar. A small piece of scotch tape will secure the wingtip in flight.
At the cliff.