My favorite hump launch.

Plank 101 - More Humping (0 min 21 sec)

Kent

Question... do you favor the pulltruded or wrapped cf tube for wing spars?

wrapped for added shear

nice winds today....

Plank 101 - Headwind behind the cliff (2 min 45 sec)

Very nice Kent !

Originally Posted by Knoll53

@miniphase: After yesterday's test flying, the CG ended up at 3 11/16" from the nose, which is a actual measurement. We probably have different methods of determining the M.A.C., so I'll leave it at that.

@EZ: Have not tried the DLG launch yet. I'll try that in Big Sur on a calm day. All the design info is in this thread. Hopefully I've encouraged you to create a spin off.

Hi Kent,

Could you please share some more details how you balance the plane with the lines.
Looks very interesting!

Thanks and regards, Tom

Sure Tom....Just hang the plane from a single point by placing the plane in a doubled over loop of string, then hang a plumb bob from the same point. I orient the wing at what I consider to be normal AOA for best glide.

This creates at standard method of checking the CG that can be recreated and any time after modifications are made to the plane.

I have never checked this method against other CG methods.

Kent