anjouan,
Sikorsky uses Vbroc to define the speed needed to keep broccoli fresh. Vy is the speed for going to the YMCA.
Who knows which abbreviation to use? I love the different terms for turbine temp (T4, T4.5, T5, T6 T7, EGT TGT TIT ) and the terms for Gas producer speeds (N1, Ng,) and power turbine (N2, Nf, Np).
Shawn,
The increase in ground speed must be desirable for Bell, thus the adjustment. I might hazard a guess that the Vtoss needs are somewhere the angle of climb, ans well as rate. Could be the increase in speed toward Vy gets them an even better angle for the first segment gradient requirements.
I would imagine that they do not need a meteorologist to get the wind because the climb can be met at zero wind, so the procedure does not need accurate wind to be flown safely.
Above is just poking around at reasons, I really am as surprised as you.
Say hi to folks at HAI for me.
N