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Hi Capt Lim,
I have a question. Why the Vee speeds during take off vary depending on altitude, temperature and air pressure?
Regards,
Patricio
Hi Patricio,
When you mentioned the Vee speeds, I believe you are referring to the V1, VR and V2 speeds. I have defined these speeds in one of my previous FAQs relating to engine failure during take off.
Well, the V speeds not only vary with altitude, temperature and air pressure but also the airplane's weight and flaps settings too. In addition, the V1 speed is also affected by the runway slope and wind conditions. Therefore, adjustments have to be made on the V1 based on these additional factors.
At higher altitude, the air is less dense. Hence you have to make adjustments by adding or subtracting the speeds as you take off from higher ground. Similarly, changes in temperature and air pressure affect the density of air too.
So, if your aircraft weight is light and you require a higher flap settings for take off, your V speeds will also be considerably lower.
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