3 fix wrong word
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As far as the laws of physics are concerned, you could do it if every so often you use the stored angular momentum in the flywheel to quickly reverse the direction of the main rotor and then start building up angular momentum in the other direction.

Disadvantages: Oh boy, where to start? You need symmetric, and thus probably less effectiveefficient, rotor blades, and a more complex swash plate arrangement. You need a main shaft and blade attachments that can transfer insane torques to the rotor during the reversal maneuver. You need complex arrangements to allow the motor exert a finely controlled torque on the flywheel over a wide range of speeds. And it's going to be a very exciting ride if the lift disappears for half a second every so often while the rotor reverses.

As far as the laws of physics are concerned, you could do it if every so often you use the stored angular momentum in the flywheel to quickly reverse the direction of the main rotor and then start building up angular momentum in the other direction.

Disadvantages: Oh boy, where to start? You need symmetric, and thus probably less effective, rotor blades, and a more complex swash plate arrangement. You need a main shaft and blade attachments that can transfer insane torques to the rotor during the reversal maneuver. You need complex arrangements to allow the motor exert a finely controlled torque on the flywheel over a wide range of speeds. And it's going to be a very exciting ride if the lift disappears for half a second every so often while the rotor reverses.

As far as the laws of physics are concerned, you could do it if every so often you use the stored angular momentum in the flywheel to quickly reverse the direction of the main rotor and then start building up angular momentum in the other direction.

Disadvantages: Oh boy, where to start? You need symmetric, and thus probably less efficient, rotor blades, and a more complex swash plate arrangement. You need a main shaft and blade attachments that can transfer insane torques to the rotor during the reversal maneuver. You need complex arrangements to allow the motor exert a finely controlled torque on the flywheel over a wide range of speeds. And it's going to be a very exciting ride if the lift disappears for half a second every so often while the rotor reverses.

2 added 127 characters in body
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As far as the laws of physics are concerned, you could do it if every so often you use the stored angular momentum in the flywheel to quickly reverse the direction of the main rotor and then start building up angular momentum in the other direction.

Disadvantages: Oh boy, where to start? You need symmetric, and thus probably less effective, rotor blades, and a more complex swash plate arrangement. You need a main shaft and blade attachments that can transfer insane torques to the rotor during the reversal maneuver. You need complex arrangements to allow the motor exert a finely controlled torque on the flywheel over a wide range of speeds. And it's going to be a very exciting ride if the lift disappears for half a second every so often while the rotor reverses.

As far as the laws of physics are concerned, you could do it if every so often you use the stored angular momentum in the flywheel to quickly reverse the direction of the main rotor and then start building up angular momentum in the other direction.

Disadvantages: Oh boy, where to start? You need symmetric, and thus probably less effective, rotor blades, and a more complex swash plate arrangement. You need a main shaft and blade attachments that can transfer insane torques to the rotor during the reversal maneuver. And it's going to be a very exciting ride if the lift disappears for half a second every so often while the rotor reverses.

As far as the laws of physics are concerned, you could do it if every so often you use the stored angular momentum in the flywheel to quickly reverse the direction of the main rotor and then start building up angular momentum in the other direction.

Disadvantages: Oh boy, where to start? You need symmetric, and thus probably less effective, rotor blades, and a more complex swash plate arrangement. You need a main shaft and blade attachments that can transfer insane torques to the rotor during the reversal maneuver. You need complex arrangements to allow the motor exert a finely controlled torque on the flywheel over a wide range of speeds. And it's going to be a very exciting ride if the lift disappears for half a second every so often while the rotor reverses.

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As far as the laws of physics are concerned, you could do it if every so often you use the stored angular momentum in the flywheel to quickly reverse the direction of the main rotor and then start building up angular momentum in the other direction.

Disadvantages: Oh boy, where to start? You need symmetric, and thus probably less effective, rotor blades, and a more complex swash plate arrangement. You need a main shaft and blade attachments that can transfer insane torques to the rotor during the reversal maneuver. And it's going to be a very exciting ride if the lift disappears for half a second every so often while the rotor reverses.