early helicopter prototype four blade rotor ink engineering draft with annotated gear diameters and angles

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Early Helicopter Prototype FourÃ¢â¬'Blade Rotor Ink Engineering Draft with Annotated Gear Diameters and Blade Angles

Ink engineering draft shows a pioneering helicopter concept with fourÃ¢â¬'blade rotor, bevelÃ¢â¬'gear mast, and chassis tubing. HandÃ¢â¬'written notations document blade attack angles, gear diameters, and power ratios. Weathered paper texture adds antique authenticity tailored for aeroÃ¢â¬'history posters. Delivered as highÃ¢â¬'resolutionÃ¢â¬Â¯6000Ã¢â¬Â¯px for sharp detail retention