Light singles...highly effective in the right hands. Obviously depends on fuel type , terrain, wx etc.....
The Bell 206L4 with TRAC's, AS350B3 and Bell 407 are used extensively in the US... Can point you in the right direction for more info if needed.
BTW--as hueyracer stated---That video is THE WORST example of heli-firefighting I have ever seen. And I do this full time.
Last edited by Gordy; 18th Feb 2013 at 05:14.