The two corners
'A' and 'F' must be smooth and constant radii.
Length 'B'
= length 'C'
Length D
= length E
Disregard any
height difference
at 'G' - it is
not important.
The up and
down-lines must be ZLA vertical. Any slow or flick rolls on them
must however be judged on their flight path / 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
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 lost
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 vice-versa.
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.
Downgrades are quite
simple - entry and exit radii must be smooth and of constant
radius or an appropriate downgrade given, the usual 1 point/5° applies in
pitch for the up and down lines and also within any roll that is
detected in the
turn, and the turn itself must pivot within the silhouette of
one wing or 'bridging' must be penalised as above.
