LSR motors and rotating mass

[Caveman]

Howdy -

Trying to wrap my thick skull around the issue of rotating mass on high-rpm motors, i.e, flywheels, driveshafts, axles, wheels/tires, etc...
Nothin' like bench racin' 
The thread is over on Bangshift.com, but I figured I'd throw up a link to it over here since some expressed interest in what the LSR crowd had as far as input...

http://www.bangshift.com/forum/index.php?topic=25427.0

[hotrod]

If your engine rpm is constant or nearly so, rotating mass of the engine,clutch and drive train is essentially irrelevant.

The only time rotating mass becomes and issue, is if the rotational speed of the engine and drive train is changing very rapidly (like in a drag car or a sports car accelerating out of a corner).

At near terminal speed in land speed racing where engine rpm take seconds to change a hundred rpm it means very little.

Reliability under continuous load trumps the ability to change rpm rapidly.

Larry