Referring to the design of the AFFF fire extinguishing system on the helicopter flight deck of surface naval ships, the foam concentration and the foam tank capacity are chosen.

And its using realm become bigger and bigger, from I/C engines of civil grass cutter, automobile and City generator sets, to driving power of military footman chariot, tank and naval ships.

Nowadays, development and application of Numerical Towing Tank has become one of the focuses in naval and ocean engineering.