# Büttner Crazy Plane

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.

## Variants
### 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.

## Specifications (Crazy Plane Duo)

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