On Sep 17, 1:58*pm, "John Scott" wrote:
I've used the same suctino cup mount as high as 18,000'. *However, I did
start at about 7,000'. *I recall pressing on it occasionally just to make
sure it was snug. *It was attached to a 1-26 canopy, just above the frame
rail, to give you an idea of the curvature.

John

The only difficulty I've had with the suction cups on the canopy is if
they get cold, the vinyl gets stiff and sometimes loses the seal.

I don't usually have that problem if I use another smooth surface in
the cockpit, just the canopy.

I've not tried any "real" system like Ram or other heavy-duty
comercial products, just the mounts that come with the PNA or
something from the local car parts store.

YMMV.

Mike