Mal Wrote:
A Cylinder of 2000 meters from the middle of the airfield in effect a
finish line radius.

We were also instructed that going below 500 ft may bring a penalty from
the comp officials not that the rules covers it in detail.

It is not covered in detail to allow different procedures at different
locations. The 500ft penalty you refer to would be imposed by the contest
organisers at a particular comp. At some sites (such as Temora) they are
dead against it. At other sites, you are encouraged to do it, as long as it
is done safely.

Nick.