Scheibe SF24 Motorspatz
The SF-24 Motorspatz was developed in 1957 as a powered version of the L-Spatz-55 and L-Spatz-III single-seater trainer or competition sailplanes; the Spatz (or Sparrow) had first flown on 12 March 1952. Designed by Egon Scheibe, the single-place self-launching Motorspatz was first flown in 1960, with the -24A and -24B models appearing subsequently. Approach control is with spoilers.
The Motorspatz is very similar structurally to its unpowered predecessor, with a fabric-covered welded steel tube fuselage and wooden single-spar cantilever high-set wings with plywood and fabric covering; the inset-hinged ailerons are also fabric-covered and there are Schempp-Hirth airbrakes in the upper surfaces. The wooden tail unit is also covered with plywood and fabric, and the landing gear conists of a fixed monowheel partly faired into the bottom of the fuselage, plus a rubber sprung tailskid; there are no outrigger balancer wheels under the wings to maintain the aircraft upright on the ground. A disc brake is mounted with the main landing wheel. The pilot sits under a one piece blown canopy. Both seats offer adjustable rudder pedals and backrests.
The initial production version of the Motorspatz was the SF-24A with a 21 hp Zink-Brandl ZB300-S two cylinder horizontally-opposed air-cooled two-stroke mounted in the nose in a conventional tractor installation; the SF-24B was powered by a 25hp Hirth-built Solo 560A 'flat four' air-cooled two-stroke driving a two-blade fixed-pitch wooden propeller, and this version had a better performance than the SF-24A. Both versions had a fuel tank of 3.3 Imp gallons capacity in the fuselage behind the wing spar. About 70 examples of both versions were built altogether.
Wing span: 14 m / 45.9 ft
Wing area: 11.87 sq.m / 127.1 sq.ft
Empty Weight: 225 kg / 496 lb
Payload: 120 kg / 265 lb
Gross Weight: 345 kg / 761 lb
Wing Load: 29.21 kg/sq.m / 5.94 lb/sq.ft
MinSink: 1.0 m/s / 3.3 fps / 1.96 kt
No. Built: 50
Structure: steel-tube/ fabric fuselage, wood/ fabric wings and tail.
Span: 46 ft 1 in
Length: 20 ft 0 in
Height: 4 ft 5 in
Wing area: 127 sqft
Aspect ratio: 16.7
Empty weight: 485 lb
Max weight: 760 lb
Max speed at sea level: 93.5 mph
Min sinking speed: 3.28 ft/sec
Rate of climb: 394 ft/min at sea level
Take-off run: 426 ft