F
F
L
L
I
I
G
G
H
H
T
T
M
M
A
A
N
N
U
U
A
A
L
L
Document No.:G304MS/AFM
Date of Issue: 07/14
4-15
Approved
The air brakes can be open up to V
NE
= 260 km/h (140 KIAS, 161
mph), however this should only be done in an emergency or when
unintentionally exceeding the maximum permissible speeds shown
in 2.2, which is indicated by a sudden deceleration. For this reason,
ensure that your harness is tight, and that you do not unintentionally
move or jolt the control column while operating the air brake lever.
Loose objects in the cockpit should be avoided, as well.
CAUTION
Extension of the airbrakes at airspeed above 170 km/h (91 KIAS,
105 mph) cause their suction, i.e. aerodynamic forces acts in the
direction of the extension. Pilot should expect these forces and
must prevent undesirable fast extension.
Pay attention also to the fact, that recovery from dives with
airbrakes employed, should be more gentle than with airbrakes
deployed (see Ch.: 2.7 load factors).
Slow speed flight – stall characteristics
For familiarization with
Glasflügel 304 MS
sailplane, we
recommend to perform stalling tests from a straight and level flight,
and from a turn of 45° bank.
The tests should be done of course at a safe altitude.
Refer to Section 5. par. 5.2.2 for the sailplane stalling speeds.
Flying without water ballast
With medium and forward C.G. positions you can fly at the minimal
steady airspeed with elevator control reaching its stop. The
controllability is adequate right up to the point where the longitudinal
control reaches its rear stop With the elevator fully deflected, the
angle of attack cannot be increased any more.
The sailplane continues to fly in straight flight with increased rate of
descent 4 m/s. This situation shows up by "spongy" controls. Slip
and bank can be controlled.
A normal flying attitude is regained by releasing the back pressure
from the stick.
