Update

well, the pi cam was working reliably, for a couple of months... then it stopped..

first it seemed to produce zero sized files, so maybe the usb webcam part has died..

it did that for a few weeks, but now it doesnt even do that..

Now the gliding season nears , I hope to be up the ladder and examine the bits !

In the mean time I've been making a backup cam, and documenting the process a bit better...