1999 17.5' Alumitech six pack (7seat) Airboat. Is powered by a massive 496 CI, or 8.1 L PCM engine with extremely low hours 250 hrs. Ready for the water and helps push this along is Rotator Gearbox, Sensenich 3 superwide prop. dvances in Hull Design Began Here The vast experience gained from building Air Gator Airboats in the 1970s to perfecting aluminum airboat hulls as Alumitech, Inc. in the 1980's advanced aluminum airboat hull technology dramatically. Superior Handling + Performance Alumintech is known worldwide, earning a reputation for quality and durability like no other.