I've had some weird effects with a Canon HG10 (hard disc). First problem was damping vibration, so it didn't shut down. Then if image stabilisation and and autofocus are on, ( and this is what it reverts to after a shut down) it may jump to sickening effect after light turbulence. The world as seen by a happy dog, whose eyes were on its tail.
I suspect it is stabilising on the prop. (A blade passes about 20 times per second.) I'm still modifying its mount.
I've got poorer, but more consistant results with a Fuji Finepix on movie mode. Samples of the videos are on the
www.laahighlandstrut.org site.
The mount is a piece of floor vinyl folded over the centre tube between the clamshell doors, with the metal camera bracket slung below. (And the metal part is easily detached in case of an emergency, to avoid risk of head strike.)