if I am not mistaken, If you get hit and are spun around it is momentum. But if you use your momentum to deliver 2 spinning punches you can call it a tornado fist punch, and if you use the tornado fist as the main part of a combo it can be called a tornado fist combo.
The move I know called “hurricane kick” (tatsumaki senpuukiaku) is a series of rotative kicks that does not use the momentum of a hit you have taken.
My fighting style has group of techniques designed to use your momentum after taking or blocking a hit called something like “reap the whirlwind”
[This message has been edited by kagemusha (edited 10-10-2004).]