Like Tallsar said, Carson Helicopters developed the "Fire King":
http://www.carsonhelicopters.com/wildfire.htm
Carson's S-61 FIRE KING
Aircraft Performance
• 22,000 lb Max Gross Weight
• 11,000 lb*External Load
• 14,000 ft Service Ceiling - 12,000 ft Take Off & Landing
• 131 Knot Cruise Speed
• 450 Nautical Mile Range
• 3.5 Hour Endurance with 30 Minute Reserve
Equipment
• Composite Main Rotor Blades
• 15 Passenger Interior
• Fire King 1,000 Gallon Fixed Belly Tank
• Goodrich Hoist (600 lb)
• Stokes Litter
• Rescue Basket
• Rescue Strop
• Rappel Anchor
• Rope Assisted Deployment Anchor (R.A.D.)
• 11,000 lb Cargo Hook
• 63" Sliding Cargo Door
• 900 Gallon Variable Flow Water Bucket
• 150', 100' & 50' Synthetic Long Line
...quite impressive.
Unfortunately there was a tragic accident in august involving a S61 fighting fires in California:
http://www.pprune.org/rotorheads/338...t=carson+crash
Disclaimer: I'm in no way affiliated nor can I elaborate about performance etc. - I don't even know if my post here would be considered as an advertisement; its merely intended for information purposes!