On Jan 6, 4:25*pm, Andy wrote:

In a simple graphic analysis of the defined task I estimated a
distance of over 8 miles of start cylinder circumference between the
intersections of the two extreme case arcs and the start circle. *In
other words, the potential front half circumference of approx 31.4
miles is reduced to a no risk arc of approx 23.4 miles.

Don't want to re-open this but just in case someone reads it later I
need to correct the numbers. I should have said:

"The potential front half circumference of 16.7 miles is reduced to a
no risk arc of approx 8.7 miles."

My error was caused by starting with the full circle circumference
instead of the half circle circumference. The numbers were fine tuned
by 9B later in the discussion.

Andy