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  Akaflieg Stuttgart FS-35 Harpyie
 
 AkaStut-FS35-01
 
The fs35 Harpyie was created by the Stuttgart Academic Aviation Group in 2003 as a motor glider designed for glider towing with good climbing performance and a large fuel tank, after Porsche had announced the discontinuation of model support for the PFM 3200 aircraft engine for 2005. This engine was installed in the club's Robin DR 400 tow plane. The following requirements were defined: high aerodynamic quality in aircraft towing in the speed range 90–150 km / h, short take-off roll distance, use of an efficient diesel engine, approval as a motor glider and design as a two-seater with dual controls for training.
 
 AkaStut-FS35-02
 
The design of the wing began with the assumption of 120% of the fuselage resistance of the Diamond HK36 Super-Dimona and the drive with a Thielert Centurion 1.7 with 125 hp (approx. 90 kW). The two-part Dimona wing was chosen, which was extended inwards, swept and provided with winglets. In April 2007, the moulding of the three-part half-span master model began, and in 2009 the construction of the fracture wing with integrated strain gauges began in the resulting negative form. A load test of this component on November 4, 2010 failed because the wing broke at 80% of the load to be verified. The wing construction began after reinforcement of the original construction and its mathematical proof of strength in April 2011.
 
The wing consists of a carbon fiber sandwich shell with carbon fiber belts and GRP -Steg. The I-shaped spar merges into a box spar in the spar stub.
 
The fuselage is also based on the Dimona, but the position of the wing had to be moved forward because of the heavier engine. The four-cylinder in-line engine Centurion 2.0s, now called the Continental CD-155, serves as the drive as a further development of the Centurion 1.7.
 
The vertical tail of the Dimona was built with the Eppler profile E 522 and increased profile depth as a GRP shell with CFRP belts in the spar. At the end of the fuselage tube, a tow coupling is installed on a boom under the tail unit.
 
The main landing gear comes from the Van's Aircraft RV-8, the nose landing gear from the Super Dimona.
 
 AkaStut-FS35-03
 
The first flight of the aircraft with the aircraft registration D-KTOW took place on August 13, 2019 in Schwäbisch Hall, the tug trials started at the Idaflieg 2020 summer meeting in Stendal-Borstel.
 
 
Engine: Continental CD-155, 155 hp (approx. 110 kW)
Wingspan: 17.67 m
Wing area: 16.9 m²
Wing extension: 18.5
Wing profile: FX 63-K-137 (mod)
V position: 3°
Empty weight: 600 kg
MTOW: 850 kg
Top speed: 270 km / h
Crew: 1 + 1
 
 
 
 


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