Originally Posted by LBCrew
I believe so.
since you're saying (and I agree) that torsional flex is limited while horizontal flex is desirable? Does causing the board to flex by weighting/unweighting help generate speed through storing and releasing energy?
It does though, it's a simple matter of physics.
I disagree that gravitational potential energy provides the vast majority of surfboards' forward kinetic energy.
It can be calculated for any given situation. The amount of physical energy which the rider can apply is a very small percentage of the overall energy equation.
Granted, for longboards it may be greater, and more significant than shortboards, but there's no hard data that I'm aware of to support either argument.
Physics determines that gravitational potential energy is proportional to mass, and it is the main means of propulsion.
Regardless... can you explain how heavier boards/riders accelerate at the same rate as lighter boards/riders? It's my understanding that more energy is required to overcome the inertia of a motionless object if it has greater mass.
Rider energy is not proportional to surfboard mass but is a small part of the equation.
The magnitude of the mass and its position both have an effect.
Also, can you explain how lowering a surfboard's center of gravity will make it ride smoother... particularly if it is of equal weight?
I would suggest it is the weight and not the location of it's center of mass.
A high centre of gravity leads to instability. The centre of gravity is lowered both by increasing the mass of the board and by reducing the thickness of the board where the rider stands.