Quote:
Originally Posted by JtD
This graph shows that 12lbs boost would be available below about 15k feet, 2.5k feet below the full throttle altitude of 9lbs boost. That's how it works with outside pressure. And that's what being made possible with the abc cut out, see 41Sqn_Banks link.
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The notes posted by Kwiatek show that for the later 100 octane planes where use of 12min for 5min instead of 3min was allowed the effectiveness of the boost is up to 10.5 kfeet
To my understanding one could go to 9 lbs without physical restriction on the throttle but had to push through the override (applying a small extra force?) in order to go to 12 lbs. Once engaged there was no more indication to the pilot through "feel" if the throttle was at 9 lbs or 9.5 lbs. Of course he would have to be carefull when using 9 lbs also.