A work in progress...
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Helicopter, rotorcraft,
blades whirling round my head, helicopter, rotorcraft, don't stop or we're all dead.
Collectively your blades do pitch,
..we twitch from side to side (tail) ..For Joule and Mayer to conserve E, a system stable it must be, you twist it here, it twist back there ..And Newton says for every force, equal and opposite you will meet, [ use ... reaction ... ] reactions opposite will you meet... ..And Newton says for every force, opposed you'll be, so as your blades around do go, so would your body opposite do flow, to stop such fate a rotor tail or gush of air, you use to negate.
Helicopter, rotorcraft,
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Helicopter, why ? 'I just kinda like the sound of it'.
Just for information ...
An object which is rotating (eg, a wheel) will keep on rotating unless a torque is applied to it (eg through friction in its axle).
Torque T corresponds to force F in linear motion.
Angular velocity w corresponds to velocity v in linear motion
Units: revolutions per second or Hertz (Hz), (but more generally use radians per second)
A torque is required to start an object rotating from rest (ie, gain angular velocity), or to stop it from rotating (lose angular velocity)
The reluctance of an object to starting (or stopping) it rotating is its moment of inertia I (this quantity corresponds to mass in linear motion)
The moment of inertia of an object depends on (a) its mass and the way in which the mass is distributed (ie, its shape, hollow or not etc.) and (b) the position of the axle (ie passes through middle or an extremity).
Parts of the object which are most distant from the axle have more effect on the moment of inertia than parts which are close to the axle.
Rotational kinetic energy of a spinning object Er corresponds to linear kinetic energy Ek:
Ek = ½ m v2
« Er = ½Iw 2
The mass m of a moving object corresponds to the moment of inertia I of a spinning object;
The velocity v of a moving object corresponds to the angular velocity w of a spinning object.