The Büttner Crazy Plane is a family of German paramotors designed by Gerald Büttner and produced by Büttner Propeller of Obernkirchen for powered paragliding. The aircraft are supplied complete and ready-to-fly.
Design and development
The Crazy Plane line was designed to comply with the US FAR 103 Ultralight Vehicles rules as well as European regulations. It features a paraglider-style wing, single-place or two-place-in-tandem accommodation and a single engine in pusher configuration with a reduction drive and a 115 to 135 cm (45 to 53 in) diameter Büttner Propeller designed propeller.
As is the case with all paramotors, take-off and landing is accomplished by foot. Inflight steering is accomplished via handles that actuate the canopy brakes, creating roll and yaw.
Crazy Plane 1
Model with a 20 hp (15 kW) Solo engine in pusher configuration with a 2.85:1 ratio reduction drive and a 115 cm (45 in) diameter propeller. The fuel tank capacity is 5 litres (1.1 imp gal; 1.3 US gal), with 10 litres (2.2 imp gal; 2.6 US gal) optional. Later called the Crazy Plane 1 S (for "Solo" engine).
Crazy Plane 1 C
Model with a 20 hp (15 kW) Solo engine in pusher configuration with a 2.85:1 ratio reduction drive and a 115 cm (45 in) diameter propeller. The fuel tank capacity is 5 litres (1.1 imp gal; 1.3 US gal), with 10 litres (2.2 imp gal; 2.6 US gal) optional. Later called the Crazy Plane 1S (for "Solo" engine).
Crazy Plane 2
Model with a 20 hp (15 kW) Solo engine in pusher configuration with a 3.05 ratio reduction drive and a 120 cm (47 in) diameter propeller. The fuel tank capacity is 10 litres (2.2 imp gal; 2.6 US gal). Later called the Crazy Plane 2 S (for "Solo" engine).
Crazy Plane 3
Model with a 20 hp (15 kW) Solo engine in pusher configuration with a 3.25 ratio reduction drive and a 124 cm (49 in) diameter propeller. The fuel tank capacity is 10 litres (2.2 imp gal; 2.6 US gal). Later called the Crazy Plane 3 S (for "Solo" engine).
Crazy Plane 3 H
Model with a 30 hp (22 kW) Hirth F33 engine.
Crazy Plane 4
Model with a 20 hp (15 kW) Solo engine in pusher configuration with a 3.25 ratio reduction drive and a 135 cm (53 in) diameter propeller. The fuel tank capacity is 10 litres (2.2 imp gal; 2.6 US gal).
Crazy Plane Duo
Two place model with a 30 hp (22 kW) Hirth F33 engine in pusher configuration with a 2.8:1 ratio reduction drive and a 124 cm (49 in) diameter propeller. The fuel tank capacity is 5 litres (1.1 imp gal; 1.3 US gal), with 10 litres (2.2 imp gal; 2.6 US gal) optional.
Crazy Plane Voyager 2 S
Model with a 20 hp (15 kW) Solo engine that folds to a smaller packing size.
Crazy Plane Voyager 3 C
Model with a Cors'Air M21Y 24 hp (18 kW) engine that folds to a smaller packing size.
Crazy Plane Voyager 3 H
Model with a 30 hp (22 kW) Hirth F33 engine that folds to a smaller packing size.
Crazy Plane Voyager 3 S
Model with a 20 hp (15 kW) Solo engine that folds to a smaller packing size.
Data from Bertrand
General characteristics
Crew: one
Capacity: one passenger
Empty weight: 29.8 kg (66 lb)
Fuel capacity: 10 litres (2.2 imp gal; 2.6 US gal)
Powerplant: 1 × Hirth F33 single cylinder, two-stroke, air-cooled aircraft engine, with a 2.8:1 reduction drive, 22 kW (30 hp)
Propellers: 3-bladed Büttner Propeller, 1.24 m (4 ft 1 in) diameter
