Humbert Tetras

Tétras
Role	Two seat ultralight or kit build
National origin	France
Manufacturer	Humbert Aviation
First flight	c.1992
Introduction	1994
Status	in production
Number built	c.150 by 2010
Unit cost	kit with Rotax 912 UL engine €15,000; flyaway €31,500 (2001)

The Humbert Tétras (English: Grouse) is a French two seat ultralight with a single engine and high wing. Available as a kit or complete aircraft, it has been in production since 1994 by Humbert Aviation of Ramonchamp.

The Tétras was first seen in public in 1992 at the RSA Rally at Moulins and marketing began in 1994. It is a conventionally laid out single engine, tractor configuration light aircraft with a high wing, side-by-side seating for two and a fixed undercarriage.

Its straight tapered wing is a composite structure, with an aluminium frame, Styrofoam filling and fabric covering. The ailerons and three-position flaps are made of aluminium. The wings are braced on each side with a single lift strut to a lower fuselage longeron. The tailplane, mounted at mid-fuselage height, is also strut braced. The fuselage of the Tétras is a steel structure covered with Dacron. Variants with both tricycle and conventional undercarriages, all fixed, have been built. The former arrangement has spring cantilever main legs, the latter has the mainwheels mounted on faired V-strut legs and bungee sprung half axles fixed to a compression frame. Both undercarriage variants have hydraulic brakes. Skis may also be fitted.