lower mass:
radio-control receiver,



The thwarting pendulum is a compound pendulum: a first pendulum is holding a second one. Depending on masses and length of each one, the oscillations, when interfering, by turns, adds or substracts.
Therefore, instead to have a permanent oscillation that the wind shifts are feeding and endure, time to time, the movements are thwarted, and a short moment, the pendulum is motionless.
It is this privileged instant that the clever kaper will catch to shoot a picture.
The camera is placed at the lower part of the upper pendulum. With underneath an articulation more flexible, this second pendulum will absorbs most of the cinetic energy coming during a wind shift.It start to oscillate with a wide amplitude, whilst the upper pendulum and the camera move only a little.
Finally, when the lower pendulum has small oscillations, it means that the camera is almost motionless.
Many years of aerial photography in riotous wind conditions have demonstrated to me the efficiency of this concept.
When I see sometimes one keeping jealously his ideas or innovations for fear that somebody else will get profit of it, I can't refrain smiling, seeing that this thwarping pendulum, which has always been pubished, have never, to my knowledge been used by another one: we are not always copied!
So, you understand that if upthere, it is really shaking, the thwarping pendulum will really help.
You will have to adjust yours depending on your equipment, and the mass ratio of each pendulum. You will have at this time to vary the length of each one, especially the lower pendulum, but there is a large margin for it.