Information on the B787 Ram Air Turbine:
I have 3 different sources of information relating to the speed control of the RAT on the 787 - all 3 confirm that the blades change pitch as a function of the speed limiter - which at the higher aircraft airspeeds or the offloading of the RAT will maintain a maximum constant speed of the turbine.
Quick link to the manufacturers site with just a quick overview of their product line;
Aircraft Ram Air Turbine (RAT) | UTC Aerospace Systems
Thanks to all of you for your information - it is appreciated
Regards,
Mx