Gearbox -physics related question

[sporno]

So Ive been doing alot of thinking, and a bit of research about decreasing rotational mass and decreasing rotational inertia.

For example ( example guys , this is all theory)

if F=MA

and lets say F is 10HP ( horsepower , which is derived from torque)
and M= 2 lbs ( lets say a gear , i know heavy , but my motorcycle if any of you guys remember my thread on the bike had a 7 lb rear sprocket)

And lets say that A is 2,000 RPM ( yes i know its not actually RPM )

ok so if the mass decreases , but the force stays the same wouldn't the RPM go up ... in theory

ok now on to the decreasing rotational inertia.

So on a gear , or any kind of rotating object , there is more torque on the outer part of the gear , as in a friction drive , the closer to the center the more HP , the closer to the outside the more torque.

but if the mass closer to the outside was decreased , rather than the inside closer to the center , wouldn't it take less initial power to move the object?

This is all just stuff Ive been thinking about.

Now how this relates to Gearboxes

If i cheesed a couple of the gears in the AM , or KOP gearboxes , decreasing rotational inertia , and rotational mass , would that have any effect aside from just cutting weight?


would it actually put more power to the ground , and create less drive train power loss?

Also in cars , people make much more power to the wheels , but getting a lighter flywheel.

So please tell me your thoughts and dont flame this too much