Vy and Vx Vary with Altitude - Why?

majorityof1

New Member
So, I know Vx and Vy vary with altitude, but why? I understand the power required vs. Power available and the engine is less effecient at altitude. Why would the speed itself change?

Thanks,
Rachel
 
Woo! I didn't have the complete answer at my lips, but I knew air density had to be a primary factor.
 
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