Specifications
Other
In nature, the Albatros is one of the best gliders, being able to stay airborne for days without a single move
of his
wings. The new standard class aircraft from Hansjörg Streifender is flying under the same name. The aircraft
is full of
new ideas and is consequently designed for excellent performance, good flying characteristics, and safety. As
compared to the simpler aircraft in the same category, the Streifender Albatros is a firework of ideas and will
probably raise a storm in the standard class.
A new fuselage wing fillet with cambered inner wing is one of the features of the new glider, significantly reducing
the
drag. This design, which was tested in the wind tunnel of the Technical University Delft, allows for a wingspan
reduction of 2 m. Other constructions often fly with turbulent air flow in this wingspan area. Since the
construction is
complex, the Albatros receives a mid-wing of approximately 2 m wingspan.
Other highlights of the Albatros include a modern horizontal stabilizer which can be electrically trimmed for slow
and
high-speed flight, as well as, a speed-controlled upper and lower wing surface blowing. The wing profile (TU Delft,
Prof. Loek M. M. Boermans) with a 95 percent laminar flow of the underneath side stands for excellent glide
performance. The aileron blowing, in this section controlled by the movements of this control surface, is
designated
for the underneath side of the wings. The Albatros fuselage is equipped with a rescue system as a standard.
Hansjörg Streifender is cautious about the performance data. However, just the estimates are promising a significant
performance leap: 25 percent less flow-around surface than the competitors, 10 percent less profile drag as the
ASW
24, and the aerodynamically optimized fuselage wing fillet.
Source: Aerokurier
Specifications 
Other
eta is the symbol for efficiency (h ). It is also the name of one of the most ambitious large projects in German
glider manufacture.
The project contains several new ideas and will certainly cause a sensation. In approximately one and a half years
from now, the self-start capable two-seater with the tremendous wingspan of 30,84 meters is supposed to fly.
The technology bed is being designed by Dr. Reiner Kickert in Braunschweig. The wing molds are made at Hansjörg
Streifeneder’s Glasfaser Flugzeug Service in Grabenstetten. This is also where the six-piece wing will be built.
Walter Binder in the Rhön area will be responsible for the fuselage and final assembly.
The German Center for Aerospace (DLR) in Braunschweig developed and windtunnel tested new profiles. Reiner Kickert
developed a new wing spar design in order to be able to really accomplish the profiles with the high-aspect ratio
wings (51,33!!).
As compared to a reference aircraft with a similar fuselage and a known profile, it is expected that the eta aircraft
will
have a 25-percent performance increase in the best glide flight profile! Still, the performance plus is limited
to a small
speed window around the best glide speed. At higher speeds, the advantage would be smaller. If everything goes
according to schedule, the eta could be presented at the 1999 gliding world championships in Bayreuth.
Source: Aerokurier
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