Clean aerodynamics and an unusual, but fuel efficient power plant
contribute to an ultralight motor glider with significantly reduced
direct operating cost. The wingspan of eleven meters provides good
soaring capabilities. A four-stroke, two-cylinder car engine guarantees
far lower fuel consumption than comparable ultralight aircraft.
An other attractive feature is the aircraft's low onboard and external
noise levels. Muffler, catalytic converter and the use of lead free
gasoline reduce ecological damage to a minimum. A fuselage integrated
aircraft rescue system offers additional safety in emergency situations.
The single seat ULF-2 ultralight motor glider was designed by Dieter
Reich. Anton Quanz built the prototype aircraft. Horst Fischer was
responsible for engine installation and electric system.
First flight was in October 1993. In February 1995 the ULF-2 design
received an airworthiness certificate issued by the DAeC (German
Aeroclub). In June 1997, Dieter Reich was awarded the OUV "Hans-Becker-Prize"
for design and development of ULF-2. The first homebuilt aircraft
flew in 1999. Fifteen ULFs are in operation in Germany.
A moderate wing taper ratio in conjunction with a "harmless"
airfoil results like ULF-1 in an aircraft which can be considered
By pulling the stick, the aircraft can slowly be stalled in straight
level flight. At 75% max. engine power and a deceleration of 2 km/h
per second the aircraft reaches a steady state equilibrium at a
angle of attack and a speed of about 48 km/h. In this state there
is no loss of altitude. The aircraft can be controlled by using
rudder and aileron as in normal flight.
At engine idle, equilibrium speed is about 50 km/h. The stick is
in max. pull position. The aircraft performs a slight longitudinal
oscillation. There is no tendency for wing drop. The sink rate is
2 - 3 m/s. The aircraft can be controlled by using rudder and aileron
as in normal flight.
When the airplane will dynamically be stalled, there is a moderate
nose-down movement but no tendency to enter a spin. The aircraft
accelerates and recovers. The loss of altitude is less than 40 m.
ULF-2 is specially suited for selfbuilders. Major construction
materials are northern pine or Douglas fir, spruce and birch plywood.
Fibreglass/epoxy is used for engine cowling, wing tips and fairings.
The airframe is covered with fabric. Steel tubes are used for engine
mount, aluminium tubes for control rods. Wing spar fittings, elevator
hinges, stabilizer attachment, elevator and rudder horn are made
of steel. Landing gear suspension, control system bell cranks etc.
are manufactured of aluminium sheet/plate material.
The propulsion system consists of the 24 kW, 4 stroke, 2 Cylinder
(opposed) CITROËN-VISA car engine, a belt driven reduction
gear and a muffler to reduce exhaust gas noise. The engine is driven
by lead free gasoline. The decontamination of the exhaust gases
is accomplished by a catalytic converter. Carburettor air is filtered
and sent through a manually controlled carburettor air heater.
The fully integrated ballistic rescue system consists of a parachute,
which is packed into a container, located behind the pilot's seat.
An electrically or mechanically ignited rocket pulls out the chute
and rescues aircraft and pilot.
Transport and storage should be done in an enclosed car trailer.
By means of gimbal joints, the wings can be pulled away from the
centre wing, and folded backwards alongside the fuselage. The detachable
horizontal tail will be located between fuselage and wing. To unload
the trailer and rigging the aircraft, one person needs about 25
The folded airplane requires the following box dimensions: width:
1.65 m; length: 6.7 m; front height: 2.0 m; height at 2 meter: 2.0
m; height at 6.7 meter: 1.7 m.
A plan pack is available comprising of:
A complete set of 29 blue prints (15 sqm); most of them are
full scale, including full-scale computer generated lines for wing
and tails. Five plans are dedicated to the installation of the CITROËN-VISA
26 shop drawings (A4).
A 50 page construction manual with many photographs, an inspectors
test and check list.
A 20 page flight-/operation manual.
All descriptions and manuals are in English language (metric units).
Total time to build ULF-2 will be in the order of 2000 hrs. Cost
of material including engine and rescue system is estimated to be
about EURO 8000.
In Germany all ULF-2 aircraft constructed under license are considered
airworthy and permitted to be flown, provided the following requirements
1. Construction supervision by an authorised inspector, according
to the check-/test instructions as written in the ULF-2 construction
manual, followed by a detailed final inspection.
2. Annual condition inspection by an authorised inspector.