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Originally Posted by raaaid
if i were to build a climbing rate gauge i would do it base on vertical angle of heading and air speed
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That means accurately knowing you angle of attack and pitch angle. In aeroplanes, the simpler and more reliable design prevails.
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but as this was made by science people i bet they linked the altitude gauge based on atmospheric pressure and its gradient be the climbing rate
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You don't understand how complicated it is to have accurate pitch and angle of attack values. Both required if you would calculate the VS. Not to mention the fact that such instrument has 3 input, aoa, pitch and speed, it needs to makes sinus (aoa+pitch) x speed, how to you make such an instrument ? Pratcically, I don't see, and if electric failure what happens ? Want to design such an instrument with just mechanics ... not so easy.
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but now think that when your flying your going from high to low pressure though you dont change altitude
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Answered in next post.
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so my question: shouldnt realistic altitude gauges oscillate A LOT both climbing rate and height?
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Wether systems dynamic is much slower than aircraft dynamics, hence it does'nt affect the flight.
We prefer to change height when local pressure changes by maintaining the same pressure altitude (that is far from the ground, when flying "flight level" which are reffered to standard ground pressure 1013,25 / 29.92). Close from ground, calibrating the altimeter is needed, but the VSD is not affected by local pressure changes because it is too slow. So answer is no for climb rate, yes for altitude but we do with that no big deal (below 3000 ft agl), and we just don't mind above that altitude (altimeter set to std reference pressure).
In real life airlpanes do not fly at constant height, they follow the pressure lines
yes that's what you just discovered through your initial question.