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Mark James Boyd wrote:
How many CDs choose cyclinders? Of theses cyclinders, how many
are centered at the airport, and how many are remote (centered away
from) the airport?

If remote, are they 2-5km out at 1000ft minimum? What is the
cylinder radius? Is it 1/2km like the previous poster's
"control point"?

A finish cylinder doesn't have to be remote, as you pull up at the edge,
not the center. If you need to keep high speed finishers away from the
airport, you increase the radius (up to a maximum of 4 miles) and raise
the floor.

I've flown in five sanctioned contests that used GPS finishes (I also
did the finish gate dance in pre-GPS days). Of those, four used finish
cylinders and one used a finish gate.

Out of the four cylinders, all were centered on the airport (at an
identifiable point, like a wind triangle), two (Montague and Tonopah)
used the standard 1 mile radius and 500 foot floor, the other two were
at Minden where a 2 mile radius and 1000 foot floor is used, to minimize
conflicts with non-contest traffic.

The finish gate was used at Avenal, the standard 1 km wide, adjacent and
running perpendicular to the center of the west side of the runway.

Marc