The Stall Turn
The Stall Turn is one of the most graceful aerobatic figures. When flown well it is beautiful to watch. The figure can be divided into a series of sections for judging:
The entry and pull to vertical
- Is the entry from truly level flight?
- Part-loops must have constant radii.
- Is the vertical hit correctly?
- Is the aeroplane on axis at all times?
The vertical up line
- Does the line stay vertical?
- Does the aeroplane stay on axis?
It is common for the aeroplane to roll on the up-line, especially towards the top
The turn itself
- Is the centre of the turn within one wing? Bridging must be downgraded.
- Is the turn in the correct plane?
- Is the aeroplane rolling at all during the turn (torque'ing)?
What is not judged
- The rate of the turn - slow or fast.
- The lengths of the up and down lines.
- Look carefully to see if the aeroplane is vertical before and after the turn.
- Check that the wing trailing edges are parallel to the horizon when in the vertical - ie. no yaw or wing-low.
- Check that the aeroplane does not fall back in pitch before the turn.
- Look for roll corrections after the turn has been completed.
- Check that the part-loops are all smooth and of constant radius.
Next page: Judging criteria explained, and the downgrades to apply.