HpH 304

The glass panel 304 is a single-seat glider racing class by the manufacturer glass wing glider. Occasionally, the aircraft is also incorrectly referred to as glass leaf H -304. Today successor models of the aircraft are available as HPH 304 by the Czech manufacturer HpH Sailplanes.


In the fall of 1979, the standing time under the management of Erich Weinzierl GRP experienced glider manufacturers began developing a Mosquito 's successor. Martin Hansen, one of the designers of SB 11, it was based on an in Braunschweig developed especially for this new aircraft airfoil with flaps and design studies by Detlef Kirchner ( Cologne ) for the cockpit area. In order to keep the risk as low as possible, they wanted to try out the new profile to an aircraft with glass panels. For this purpose, a mosquito wing with micro-balloons was brought to the calculated profile contour and then measured with a Mosquito fuselage in Braunschweig. The expectations of K. H. Horstmann and A. Quast in her latest profile were confirmed. Well you could go to the fuselage end of February 1980. The nose and cockpit were completely remodeled. During the following months until the first flight ( May 10, 1980 M. Hansen in nabern ) was parallel to the hull and worked on the new airfoil shapes. Incidentally, the negative molds were first made ​​for the wing completely embedded in plastics. Glass wing, reaching a much better dimensional stability and long-term stability.

With the bankruptcy of glass wing in 1982 ended the production of the 304 by 62 units.

Mid-nineties, the molds for the production of the Czech company HpH were taken. The 304 has since been built as HpH 304 CZ and again as part of the facelift came various other versions of the aircraft.


The profile HQ 010-16.42 16.42 % relative thickness is very much better than any used in recent years for " racing class " aircraft profiles (lowest decline in 31 kg / m² in its rate of climb: 0.57 m / s ). Nevertheless, the aircraft reached the glide ratio is certainly more than 42, probably even 43 Glasflügel deliberately chose the greater thickness compared to other new profiles. Since the high-speed flight performance yet are conveniently resulted in additional advantage of being able to build the plane with a reasonable curb weight (235 kg) whole with glass-fiber reinforced plastic. In addition, offers the ideal conditions to produce the same total weight, the wing in CFRP ( carbon fiber) - design with wing tip at 17 m wingspan, without having to accept any purchase restrictions (eg take-off mass and maximum speed). This one had firmly resolved for next spring.

With her ​​hull nose glass leaf followed the general trend without compromising on the nose hook. The "revolution " took place within the fuselage shell: In the 304, the instrument panel works with the front hinged hood (supported by a gas spring ) completely upwards. A not previously known before easy entry and exit was possible. The hoses and cables for instruments and the radio go through the pivot point of the hood mounting and are protected moved the plane. There is thus in the hull boat no more disturbing parts and the pilot needs to do is embark on the stick without having to thread the legs. The oxygen monitor panels are mounted in a console under the control stick and are easy to read.

Further technical features are combined with the flaps trailing edge pivot brake flaps and the parallelogram with trim button.

The 304 has a retractable landing gear.