Comanche by Novalogic
Comanche was an attack helicopter sim from Novalogic released in 1992.
The graphics engine used "Voxel" technology which was a novel way of treating pixels to gain more detail and speed. Rather than applying bitmaps to 3D terrain, each pixel actually contained it's own altitude data. The result was the most exciting terrain seen on a PC to that point in time.
It excelled at producing a sensation of low altitude flight.
Novalogic reviewed at MiGMan's Flight Sim Museum - www.migman.com:
Comanche - Over the Edge
F22 Lightning II
F-22 Lightning 3
F-16 Multi Role Fighter
MiG-29 Fulcrum - (Novalogic - 1998)
Official site - Novalogic
Novalogic in profile.