Engine operation was normal and airspeed developed above rotation speed.

"But what I don't understand is how the tree can change its rotation speed."

These systems sometimes have variable rotation speeds, and will reverse direction automatically.

Or with more fields you could keep up the same rotation speed but still get the eight week cycle slotted in.

It also detects and records fluctuations in the rotation speed of Earth.

The Mig-31 took barely one third of the runway to come up to rotation speed.

Once this has been learned, the rotation speed can be gradually increased until the balls separate in the hand.

They are simple in design, making them rugged and capable of high rotation speeds.

The reason is due to the effect of the rotation speed for each blade.

They are intended for use on slower aircraft, with a rotation speed of less than 100 knots.