SSD and
maxred 
Regrettably it doesn't surprise me at all.
Heston, you seem to have changed your tune with your last post. As
SSD says,
as far as an aeroplane is concerned there is no wind once it is off the ground and in the air
which is what I've been saying all along, as in,
Turning downwind with 74 k climb speed meant our ground speed went from 14 to 134 knots. No acceleration applied to the airframe or pilot, as any accelerometer on the aircraft would tell you, for the simple reason an aircraft is operating, as I said, with respect to the airmass, not the earth.
PS: You'll need to study the principle of INS a little closer.
A little bedtime reading from a highly trained individual.
http://www.australianflying.com.au/n...-downwind-turn