Just a theory
@ Ted - without having seen your wheel, I've been thinking of possible variables as to why your pendulum might pull the wheel down more without the spring..
In my experiments, the pendulum and lever are in sinc; for each swing of the pendulum, the opposite arm will go from up to down to up..
To get it in sinc, I had to change the position of the weight with reference to distance from the pendulum's fulcrum. This changes the period of the pendulum's swing..
I wonder if things change re the spring's effect
@ Ted - without having seen your wheel, I've been thinking of possible variables as to why your pendulum might pull the wheel down more without the spring..
In my experiments, the pendulum and lever are in sinc; for each swing of the pendulum, the opposite arm will go from up to down to up..
To get it in sinc, I had to change the position of the weight with reference to distance from the pendulum's fulcrum. This changes the period of the pendulum's swing..
I wonder if things change re the spring's effect
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