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What would happen if each of the fan blades weighed 1000kg? They would barely move and so you'd get basically 0 thrust.
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What would happen if the fan blades were angled so that they sliced through the air without pushing it up or down? You'd get 0 thrust again.
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What if the rotor was really poorly made and had a load of friction, so that all the power was wasted as heat? Again, you'd get very little thrust.
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What would happen if each of the fan blades weighed 1000kg? They would barely move and so you'd get basically 0 thrust.
•
What would happen if the fan blades were angled so that they sliced through the air without pushing it up or down? You'd get 0 thrust again.
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What if the rotor was really poorly made and had a load of friction, so that all the power was wasted as heat? Again, you'd get very little thrust.