Performance Sea Level verse 9000 feet?

ArduCopter Copter 4.0
1

Looking for rough estimate difference in motor and prop performance from the two elevations. How much extra energy would the higher altitude require? Not sure if this is a simple answer, but maybe a rough percentage difference?

2

Let’s see what eCalc says, all else being equal (which isn’t likely):

Sea Level:

Seal level
Seal level2272×1600 436 KB

9000 Ft:

9000 ft
9000 ft2287×1564 426 KB

3

Thank you, Dave.

I just signed up for ecalc, but unfortunately they do not have any motor base data on the Hobbywing X8 and X9 motors as well as the built in esc’s. Does any one have any of that info I can plug in? I have tried to contact the manufacturer with no luck.