It was kinda weird that they would depict the blower drive as being driven by a pneumatic clutch, defeats the purpose of "power on demand" . Not to mention the fact that that kind of clutch set-up couldnt support the torque output and also where did the engine get its air from when the "blower" was turned off??
on a different note a buddy of mine and myself saw this movie in the star telegram movie listings and decided to go watch it (late 70"s) and were very surprised by what it turned out to be. we had never seen any trailors for it.