User manual

ASK21, ASK21 Mi 1.00 Manual
Page 9 of 16
C4 COMPETITION
Without a doubt the heart of this product, the C4 competition is a flight computer that
is used in glider competition (but also for recreational flights). It is capable of using the
loaded flightplan, your GPS-determined position and the performance of the glider to
make many calculations. It is far too complex to describe them here and we are happy
to have permission of the manufacturer (Franz Pöschl GmbH) to include the actual
manual. You will find our representation of the instrument to be accurate and detailed
in almost all functions. You will find the C4 Competition powerful but you have to
spend half an hour of getting to know it. We assure you this will be time well spent.
YAW STRING
It’s rare that the most important instrument in an aircraft does not cost more than a simple piece of tuft or yarn. But
many glider pilots will tell you that the yaw string (also called slip string) is the most important gauge they have and it is
in fact considered part of the primary flight reference instruments. It is taped to the canopy and it simply moves in the
airstream. If it is centered you are flying the glider as efficiently as possible (without any slip and a yaw angle as small as
possible).
Rudder left or
aileron right to correct
Optimal
Rudder right or
aileron left to correct
For pilots that are used to flying motorized aircraft it is often hard to stay fully coordinated in a glider, but the yaw
string will help a lot.