More thoughts on Stall Turns
- The up and down-lines must be ZLA vertical. Any slow or flick rolls on them must however be judged on their flight path or CGT.
- In the turn-round you should see yaw without any pitch or roll. Sideways movement of the aeroplane (called ‘bridging’) of up to one wingspan during the 180° rotation is acceptable, but any more than that must be penalised: the downgrade is 1 point per ½ wingspan, or beyond 2 wingspans the penalty is a ‘Hard’ zero.
- The part-loop radii 'A' and 'F' may be of different sizes, but must have constant radius.
- Be critical about the verticality of the aircraft ZLA in the up-line all the way to the top.
- Any pitch or roll in the turn-round is a clear error - 1 mark should be deducted per 5° as usual.
- In a stall-turn with rolling elements up or down there may be several changes from CGT to ZLA judgement and back.
- If the exit is on the "A" axis check that the direction is correct, and in erect or inverted flight as is required by the sequence.
Entry and exit radii must be smooth and of constant radius or an appropriate downgrade must be given. During the verticals the usual 1 point per 5° applies in pitch for both the up and down lines, and the same applies to any rolling / wings not vertical that you see during the turn. The turn itself must pivot within the silhouette of one wing, or any 'bridging' you see must be penalised as above.