Hi guys,
I can't really get my head around one question regarding Vx and Vy. How does Vx and Vy vary with altitude? Is there a difference to the answer if we compare it to turbo-props and jets?
The answer I was told is Vx remains constant while Vy decreases.
To my understanding Vx and Vy is TAS. As altitude increases the density of air decreases and so thrust decreases. Therefore climb gradient decreases. To compensate and try to get back the best gradient thus wouldn't it be a reduction of speed to give a better climb gradient?
Why does Vy decreases with altitude? As density decreases thrust decreases thus power available decreases so rate of climb reduces. But I can't see how reducing Vy can give a better climb rate?
Thanks in advance! A bit confusing...
