Calculating the optimal balance point
Ok, i have made the wing attachement system. It woks ok, but the dihedral is a little bit too much. We'll see later.
It adds 1,5g but it makes the plane easier to transport.
I've calculated with a program, that the COG is 8 cm after the leading edge of the wing.
In fact, the optimal balance point is backward because of the stabilisator's area and the great lever.
René Jossien proposed a formula that takes in account these parameters + the kind of airfoil, etc...
Read this instructive article:
With Rene Jossien's formula, i find a balance point at around 9,1 cm behind the Leading edge.
This result sems to be confirmed by the glide tests.
This would mean that i don't really need to put the AR6400 so much frontward to balance the plane.
I can probably shorten the piece of depron which supports the brick, and still balance the plane with two190 mA.h batteries (10g) installed a little frontward.
More to come...