Sounds good Colin. Easier to switch booms with your mounting method. I was planning to use the camera plate from the CS gimbal. Andy, my thinking was that since they would all be strapped down the same way it would be a relative reading. And the strap only restricts Z axis movement a little. Maybe using a bungee cord or foam around the boom would let it have some give. Although I'm wary of using anything less secure because my motors put out a lot of thrust. Not a fan of hanger crashes.
Tim: Yeah, I think a quick experiment would tell us whether or not the hold-down strap being in-board or out-board of the iPhone makes any difference. You could also have second backup strap outboard near the motor, but hanging loose. As you say, hangar crashes or ceiling parking are Bad Things. Andy.
Not yet. I'm in the middle of a DVD production, so may take a few more days -- plus pretty much solid rain here. Every day! Andy.