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above the longitudinal axis of the fuselage.
Considerable forward motion on the control stick
may be required to maintain flying airspeed. If altitude
is low, there is not enough time to stow the
engine and reduce the drag that it creates. Land the
glider with the engine extended. Glide ratio in this
configuration will be poor due to the drag of the
extended engine and propeller. The authoritative
source for information regarding the correct
sequence of pilot actions in the event of power failure
is contained in the GFM/POH. The pilot must be
thoroughly familiar with its contents to operate a
self-launch glider safely.
If the power failure occurs during launch or climb,
time to maneuver may be limited. Concentrate on flying
the glider and selecting a suitable landing area.
Remember that the high drag configuration of the
glider may limit the distance of the glide without
power. Keep turns to a minimum and land the glider as
safely as you can. Do not try to restart the engine while
at very low altitude because it distracts from the primary
task of maintaining flying airspeed and making a
safe precautionary landing. Even if you could manage
to restore power in the engine system, chances are that
full power will not be available. The problem that
caused the power interruption in the first place is not
likely to solve itself while trying to maneuver from low
altitude and climb out under full power. If the problem
recurs, as it is likely to do, the pilot may place the
glider low over unlandable terrain with limited gliding
range and little or no engine power to continue the
flight. Even if the engine continues to provide limited
power, flight with partial power may quickly put the
glider in a position in which the pilot is unable to clear
obstacles such as wires, poles, hangars, or nearby terrain.
If a full-power takeoff or climb is interrupted by
power loss, it is best to make a precautionary landing.
The pilot can sort out the power system problems after
returning safely to the ground.
INABILITY TO RE-START A SELF-LAUNCH
GLIDER ENGINE WHILE AIRBORNE
Power loss during takeoff roll or climb are serious
problems, but they are not the only types of problems
that may confront the self-launch glider pilot. Other
engine failures include an engine that refuses to start
in response to airborne start attempts. This is a serious
problem if the terrain below is unsuitable for a safe
off-field landing.
One of the great advantages of the self-launch glider is
the option to terminate a soaring flight by starting the
engine and flying to an airport/gliderport for landing.
Nearly all self-launch gliders have a procedure
designed to start the engine while airborne. This procedure
would be most valuable during a soaring flight
with engine off during which the soaring conditions
have weakened. The prospect of starting the engine
and flying home safely is ideal under such conditions.
As a precaution an airborne engine start should be
attempted at an altitude high enough so that if a malfunction
occurs there will be sufficient time to take
corrective action. If the engine fails to start promptly,
or fails to start at all, there may be little time to plan
for a safe landing. If there is no landable area below,
then failure to start the engine will result in an emergency
off-field landing in unsuitable terrain. Glider
damage and personal injury may result. To avoid these
dangers, self-launch glider pilots should never allow
themselves to get into a situation that can only be
resolved by starting the engine and flying up and away.
It is best to always keep a landable field within easy
gliding range. There are many reasons that a selflaunch
glider engine may fail to start or fail to provide
full power in response to efforts to resume full-power
operations while airborne. These include lack of fuel
or ignition, low engine temperature due to cold soak,
low battery output due to low temperatures or battery
exhaustion, fuel vapor lock, lack of propeller response
to blade pitch controls, and other factors. It is important
for the pilot to have an emergency plan in the
event that full engine power is not available during any
phase of flight.
SELF-LAUNCH GLIDER PROPELLER
MALFUNCTIONS
Propeller failures include propeller damage and disintegration,
propeller drive belt or drive gear failure, or
8-17
failure of the variable blade pitch control system. To
perform an air-driven engine restart, for example,
many self-launch gliders require that the propeller
　
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