Ziou

Wingspan 141 cm - 55.5 in
Length 61.5 cm - 24 in
Wing area 21.9 dm² - 339 in²
Weight 460 g - 16.2 oz
Wing loading 21.0 g/dm² - 6.9 oz/ft²
Airfoil SC21

Simplicity and versatility

The objective with the Ziou is a flying wing that can be used as a beginner's model, but also to progress to inverted flight.
Wings are simple: less construction (no fuselage and no tail), 2 channels only, and a compacted inertia therefore less damage on hazardous landings.
The airfoil, called SC21, is simply a reworked mixture of FAD16 (Franck Aguerre, flying wings) and SB96v (Serge Barth, aerobatic gliders). This is to have an airfoil that meets the requirements of a wing (Cmn pitching moment, not very sensitive to the incidence) but also efficient in inverted flight.
The look is inspired by birds such as the swallow and the kestrel. Curved wings therefore, and a long but not tall rudder, to give the illusion of a thin tail.

Adjustable dihedral

For beginners with this wing, the dihedral is adjustable: there are simply 2 different wing joiner slots. In the wings, and in the fuselage. One takes a 6mm rod for easy flight with 10° dihedral, the other an 8mm tube with 1.5° dihedral.

Pointed ailerons?

The ailerons of the Ziou are decreasing in chord and form a long triangle to the wingtip. Obviously this calls out: isn't it near the wingtip that the roll order is the most effective? Well, I wanted to give it a try anyway, because this setup has other advantages:

And finally, in flight tests, no real roll problem ... I find her nervous enough for my taste when asked. Obviously bigger deflection is needed.

Flying

Video to come ...
The Ziou flew 2 afternoons in easy conditions. The rolling rate is quite good with suitable deflections. When you push, it accelerates well! I have not yet tried the soft version with the beginner's dihedral. More to come!