Two seater in a new dimension - Schempp-Hirth

Copyright © Schempp-Hirth Flugzeugbau GmbH
Two seater in a new dimension
independet - powerful - reliable

Arcus M
A two seat self launcher of the latest generation. This
completely new concept sailplane with a newly design-
ed fuel injection motor is our star in the 20 m class.
The intensive development of this innovative and
modern sailplane was planned from the beginning
to be capable of self launching. While soaring, the
added weight of the motor is hardly noticeable by
the pilot thanks to the new concept and modern flap
airfoil. The higher load due to the heavier high performance
70 hp engine should not be compensated
for by a larger wing area.
Through new technical expertise in designing the flap
airfoil and with the help of Dr. W. Würz (Uni Stutt-
gart) we were able to design a high lift airfoil. Therefore
it was possible to have a relatively small wing area
with high aspect ratio and high lift. The results of this
consistent design approach were definitely worth
Technical Data
Arcus M empty weight. 530 kg/1168 lb Arcus M wing loading. 38,5 - 51,3 kg/m 2 / 7,9 - 10,5 lb/ft 2
Engine Solo 2625-02i Propeller Technoflug
Cylinder capacity 625 ccm Tank capacity 19 Liter
the extra effort. The Arcus M proves very strong
performance and very versatile and harmonic flight
characteristics. The phenomenally short take-off role
and the impressive climb rate when self launching is
more than convincing. The triple panel spoilers make
very short and exact landings possible. The steerable
tail wheel makes takeoff and landing roll maneuvering
effortless.
Operating the engine is made extremely simple
through the new automatic concept.
To start the engine, one needs to switch the ignition
‘ON’, and after the pylon is fully extended
push the start button. The start behavior of the
engine is always optimal because the microprocessor
adjusts to the particular conditions. After
turning off the ignition, the propeller is stopped automatically
and in the exactly proper position by the
ILEC-control unit and the brake arm. The pro
peller is held in position and the pylon is retracted.
Rated power 52 kW/70hp Range (680 kg) ca. 350 km / 189 nm
Description of the flight engine 2625-02i
General description:
The carburetor and the ignition coils are replaced
by an electronic fuel injection and electronic ignition
system in the 2625-02i model engine. The former
ignition coils are replaced by a generator, which
supplies enough energy for the fuel injection and
ignition. A control device regulates the fuel flow and
the ignition timing depending on the RPM, throttle
position, engine temperature, air pressure and air
temperature. This allows the motor to perform optimally
in all conditions.
Redundancy system
In order to provide the highest safety against an
engine failure, a system was designed so that in
the event of an engine problem the controls can be
manually switched to the redundant system. The
system is made up of a simple electronic unit where
the engine characteristics are saved. Using this
characteristic (fuel flow depending on RPM), the 2
additional injectors are controlled. The fuel is fed
through 2 fuel lines leading to the intake manifold.
The rotation frequency and the constant ignition
timing are measured by an additional RPM meter.
The electronic unit has 2 ignition drivers which control
both ignition coils that are also used in the normal
engine mode. This system has no altitude or
temperature adjustments. The operation limitations
remain unchanged with this redundant system.
Fuel and Mass
Approved fuels and oils are:
Fuel:Unleaded super gasoline, AVGAS100 LL
Oil: Castrol ACT>EVO, Castrol Super Two Stroke
and (other oils specified JASO FC or FD)
The mass of the engine not including muffler system
(manufacture specified) is 23,85 kg
SCHEMPP-HIRTH
Flugzeug-Vertriebs GmbH
Krebenstrasse 25
73230 Kirchheim/Teck, Germany
Tel. +49 7021 7298 - 0
Fax +49 7021 7298 - 199
E-mail: info@schempp-hirth.com
www.schempp-hirth.com
Subject to change without notice / © 2011/03 by Schempp-Hirth