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Intro: When a Phillips Is Not a Phillips! Cross-head, Cross-Point, Cruciform, Square Drive Screws and Drivers These screw types have a + shaped recess on the head and are driven by a cross-head screwdriver, designed originally ... Step 1: Early Screws.
MSH protos mechanics left side. The drive train of the Protos is unique. The tail rotor tooth belt is also used to transfer power from the motor pinion to the main rotor main gear and then the same belt is used to transfer power to drive the tail rotor. This all worked very well and produced a light weight helicopter.