Motor Choice

[DrKnow65]

on 5S the 1518 is the only one that will spin fast enough to do some good speed runs without insanely large gears

5 x 3.7 = 18.5v

18.5v x 1800kv = 33,000rpm (sweet spot is around 45,000rpm, max is 60,000rpm)

of course you could always go with a 1527 .5y race wind, if you have the cash and the time to wait for it to be built...