The Gulfstream IV seats fourteen to nineteen passengers with two crew members. The Gulfstream IV is powered by two Rolls Royce TAY engines. The cruise speed is 458 kts, the stall speed is 108 kts, and the range is 4,420 miles. The empty weight is 42,500 lbs and the gross weight is 73,200 lbs. The IV model was later designated the Gulfstream G300 (GIV) and the Gulfstream G400 (GIV-SP). The 400 features a longer range, a large cabin, and similar design to the G series. It came with the option of Honeywell SPZ 8000 avionics package that came standard with later versions. The 300 model is the shorter range variation of the 400/GIV-SP.