Calculating Moment of Inertia...

[MikeMike]

Formula I=(1/2)MR^2

what i have one large flywheel, with a small capstan in the middle.

the large flywheel has a radius and a mass, as does the capstan. i have everything for them, i just dont know how to combine them so as to find moment of inertia, any help is appreciated.

 

[MobiusPizza]

you just add the two moment of inertias together to get the total moment of inertia

 

[MikeMike]

Originally posted by: AnnihilatorX
you just add the two moment of inertias together to get the total moment of inertia

DOH

 

[Triumph]

haha, that was easy! now, translate both of them to a point somewhere else in space that doesn't lie along their axis! quick, what's the equatioin

if i remember correctly it's (inertia about its own axis) + mass*distance to new point^2. or i could be completely wrong, i never use that stuff anymore.

 

[DaTT]

Originally posted by: Triumph
haha, that was easy! now, translate both of them to a point somewhere else in space that doesn't lie along their axis! quick, what's the equatioin

if i remember correctly it's (inertia about its own axis) + mass*distance to new point^2. or i could be completely wrong, i never use that stuff anymore.

 

[MikeMike]

no one even saw my huge error, forgeting 1/2

 

[Mo0o]

Originally posted by: Triumph
haha, that was easy! now, translate both of them to a point somewhere else in space that doesn't lie along their axis! quick, what's the equatioin

if i remember correctly it's (inertia about its own axis) + mass*distance to new point^2. or i could be completely wrong, i never use that stuff anymore.

parallel axim theorum

 

[cavemanmoron]

Move the engine's mass closer to the center fo gravity of the vehicle
for better handling.

Make sure that there is enough mass on the steering axis/plane/skis/tires,etc.....
to offset the addition of a driver/rider.

Try to keep the drivers weight low and centered too.

Thats what the caveman knows on moment of inertia,LOL.

 

[MobiusPizza]

what? Is the flywheel and and capstan not concentric?

 

[Eeezee]

Moment of intertia stuff isn't any fun anyway. Go use a Lagrangian