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I am doing an univeristy project to do initial sizing of an electrical vtol drone. Using the aircraft design book from Raymer, I have gotten the battery mass fraction for the cruise, loiter, and climb segment of the mission. However, I can't find a useful value for takeoff and landing battery mass fraction in the book or anywhere else. Is it that climb and takeoff can be count as the same flight segment and the battery mass fraction for landing segment is just a little bit higher than the climb segment?

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It would seem quite reasonable to assume that for a vtol drone (or any other vtol acft) takeoff can be considered to be insignificantly different from climb segment. Only difference would be the short time the drone would operate in ground effect, this phase would last for no more than 5 second.

The same would apply for descent/landing.

I'm not familiar with the concept of battery mass fraction, but the ground effect would work in favour of the drone, making it consume less battery capacity.

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