Screw-lift for the flying machine and force-multiplying carts
Six six-fold screws that gain a braccio of lift, a geared bell-cart, and a cart multiplying a small weight enormously
The top of the sheet shows a propulsion mechanism for the flying machine driven by screws: each screw runs in six threads, and turning six nuts against them gives a great gain in raising and lowering, each nut shifting a sixth of a braccio so that together they make a braccio. Two carts below develop mechanical advantage through gearing. A bell-cart on double wheels keeps its weight over the upper axle, with a pinion one-sixth thick, wheels of 2 1/2 and 2 2/3 braccia, and gearing of 8 spindles to 64 teeth. A heavier cart with tripled wheels is called 'tremendous': built to the measures shown, one hundred pounds of force pulls one million one hundred forty-four thousand.
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Six-fold screw-and-nut lift for the flying machine
The flying-machine drive gains greatly in raising and lowering because each screw is cut in six threads. Turning the nuts against the screws, each nut shifts one sixth of a braccio, so that six nuts together produce one braccio of movement.
Bell-cart geared 8 spindles to 64 teeth
The cart's weight is kept over the axle of the upper wheel. The lower axle carries a pinion one-sixth thick; the lower wheel stands 2 1/2 braccia and the upper 2 2/3 braccia; the pinion has 8 spindles and the wheel 64 teeth.
Tripled-wheel cart multiplying 100 lb into 1,144,000
A heavy weight rides on a cart with tripled wheels, which Leonardo calls tremendous. Built with the wheels and pinions to the measures shown alongside, one hundred pounds of force pulls one million one hundred forty-four thousand.