Depends how you are gear my friend. My 1512/3D draws up to 75 amps geared for 45mph, on 7s A123 pack. MY Revo is now just over 9 pounds, very light, and accelerates like mad.
So if you can guess on your weight, and speed, then I can guess on amperage, I have taken a few eagletree's on my setup, and have enough experience that I should be close.
“The modern astrophysical concept that ascribes the sun’s energy to thermonuclear reactions deep in the solar interior is contradicted by nearly every observable aspect of the sun.” —Ralph E. Juergens