Actual operation of the Merlin boost regulator

[41Sqn_Banks]

Originally Posted by Sutts

In terms of maintaining boost in a climb automatically, my understanding is that would be the case if the pilot had pushed the throttle to its max position before the climb. In this case the boost limiter would kick in and the excess boost would gradually be applied as altitude increased until a point where excess boost was no longer available (10000ft?), at which point boost would start tailing off.

If, however, the pilot only advanced the throttle as far as required to select the climbing boost value and no further...then the boost limiter would not be in operation and boost would NOT be maintained as he climbed to higher altitudes. Do you agree?

In case of a (early) fixed datum type boost control you are correct. However the variable datum type boost control does maintain the selected boost until full throttle height even if the throttle is not at the gate.