If my physics is correct, the formula for constant power from standstill is v=3/2*d/t, plug in d=2000m runway and t=38 seconds and we get a threshold speed of 153.5kt, plus/minus measuring error. That's the theory, anyway.
See later posts for criticism.
Last edited by Musician; 13th Oct 2017 at 14:22.
Reason: corrected "acceleration"->"power", calculation is not as useful as I thought it was