WEIGHT POWERED VENTILATOR

What it is?????A compact ventilator that uses a falling weight to spin a propeller through a multi-stage gear train. As the weight descends, it pulls a cord wrapped around the first gear. That rotation is multiplied by the gears so the final small gear and propeller spin much faster, producing airflow. Its fun diy! It will spin to 5-15 min depend how long a wire is !! Gear ratio explained (why the last gear spins faster)Gear ratio (one stage) = (teeth on driven gear) / (teeth on driver gear).Output speed = Input speed / Gear ratio.If a large driver turns a small driven gear (e.g., 60T → 20T):Ratio = 20/60 = 0.33 → output ≈ 3× faster.If a small driver turns a large driven gear (e.g., 15T → 50T):Ratio = 50/15 ≈ 3.33 → output ≈ 3.33× slower (but with more torque).In your ventilator, several speed-up stages are cascaded. Multiply stage ratios to get the total speed-up.Example: (60→20) × (45→15) × (40→10) ≈ 3 × 3 × 4 = 36× faster at the prop.So yes—if you spin the first gear, the last gear