kerdon,

1000 ft-minimum. Better yet, if you don't HAVE to fly on that side of the field, don't. A thousand feet can turn into 500-oops, I mean 150, oops !! I have seen people that thought they had "a couple hundred feet" HIT powerlines. Depending on the condition of the lines, and the type of covering/hardware you plane has, you could even cause an arc to jump from the lines-not good.

A year ago I saw a park flyer destroyed, and fortunately that was all, when a kid flew it near some low lines in the rear of a commercial parking lot. An arc jumped about 2 feet to the plane, which smoked all things electrical, and the resulting dive to the pavement below was terminal. -Not good.

Think about the same type of thing with a gas model.-Not good.

Jetts