FSX Spiteful Mk XVI. The Supermarine Spiteful was a direct development of the Spitfire using a new laminar flow wing. Spiteful RB518 was modified to Mark 16 configuration and fitted with a Griffon 101 engine. During a test in 1947 this aircraft attained 494 mph at 27,500 feet. RB518 goes up to 430 knots as the real aircraft did. The model is made for FSX with special .air file and modified texture by A. F. Scrub.