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A schematic diagram showing the internal transmission system of a helicopter, including engines, gearboxes, and drive shafts.

A schematic diagram showing the internal transmission system of a helicopter, including engines, gearboxes, and drive shafts.

A schematic diagram of a helicopter transmission system, overlaid on the light grey side profile silhouette of the helicopter shown in image_76.png. Inside the silhouette, stylized white lines and shapes represent the key components: two engines (rectangles) in the upper rear fuselage, connected by shafts to a large central main gearbox (MGB, irregular polygon) below the main rotor mast. A thick white line represents the main rotor shaft extending upwards. A thinner white line represents the tail rotor drive shaft running along the tail boom to a small tail gearbox (TGB, square) and tail rotor at the rear. Arrows indicate power flow from engines to the MGB and then to the rotors. Text labels "Engines", "Main Gearbox (MGB)", "Tail Rotor Drive Shaft", and "Tail Gearbox" are placed near their respective components in a clean, technical font. The background outside the silhouette is white. See more