Quote:
Originally Posted by 41Sqn_Banks
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Olivier Lefebrve (butch2k), one if not the most knowledgeable person on the 109 I know posted this some year ago about the clockwork mechanism. He named this document for DB 601Aa, so I guess its from some kind of 601Aa manual.
I will attempt to give quick and rough translation:
"Increase of output for takeoff (Allowed period: 1 min)
Through pushing the throttle the beyond "Vollast" (Full load, this is probably the 5-min rating - KF) position, without leaving it in the "Abflug" (Takeoff) position.
The holding of the throttle in the "Abflug" position is unnecessary, and therefore pointless; it will repeatedly return to "Vollast" position.
The mechanical clockwork, which is winded by pushing the throttle in forward will disengage the manifold pressure / boost increase automatically after 1 minute, regardless of the position of the throttle. Holding the throttle in the "Abflug" position does not restart or lenghten the increase in manifold pressure, instead it will just increase the richness of the mixture - and therefore no increase in engine output but an increase in fuel consumption - after the throttle has returned to its position."
So basically once activated, it's ON for one minute. I guess its cannot be deactivated either, though given that the clockwork is winded by pushing the throttle forward, its quite clear that the process can be repeated AFTER the one period period has elapsed.
The November 7 1940 issue of Flight magazine (available online) also briefly mentions the clockwork in a DB 601 article, though it does not mention how it works.