I saw the attached picture in 2011 F3A France blog site (http://jp-f3a.blogspot.com/).

The drawings on the transparent sheet indicate a loop and one or two 45 degree lines. The idea looks very cool.

On the other hand, the circle is not drawn perfectly round. Should the loop be flown as close to round as possible, perceived from the ground?

Hi,
It is drawn as a correct circle. ;
http://4.bp.blogspot.com/-HucA11UkVJ...0/RSCN1711.JPG
The camera angle is affecting how it looks.
If you were to scale it up the camera would be out past a line square to the end marker. A vary oblique view.A little worse than any parallax the judges have to account for when they observe end manouvres. It does show how this can be an issue for pilots and judges.They will never all get on the same page.

Briam

No, it should be round.
Same as a 45° line should be at 45° both at the center and anywhere else in the box. Seen from the center it may look steaper further out to the sides. The judges have to compensate for this, not the pilot.

Magne

OK. That is what I thought.

I would think the template can be placed on a stand, and the pilot looks through the template, and carefully flies the plane so that it aligns with the lines/cycles.

I have one of those. It helps.

Great to know. Could you please some pics and descriptions on how yours are made and used?

Hi,

I have heard Hanno Prettner used someting like this when he practiced, when he was active (maybe it was wood frames placed in front of him) to aid in correct geometry of various maneuvers. Just to see one stay in the 60 degree "box" I'm sure there are some good "tools" people use for that?

/Bo