Pimpernel Leader
4th Jan 2007, 13:14
Hi all,
I am in the process of writing a de Havilland Dove/Devon ops manual so that our company can operate it on our JAR AOC. As the Dove is one of the aircraft I'm lucky enough to fly, I am fairly familiar with it, but I do have one question which I'm hoping an old piston aficionado will be able to answer for me. :hmm:
It concerns the aircraft's automatic mixture control funnily enough. Why does the flight manual give not only a Boost Limit but also a RPM limit when stating it's 'Maximum Weak' mixture setting:sad: . From my Layman's standpoint, I would assume that the automatic leaning is a function of the Carburettor and I'm not sure how Prop/Engine RPM effects it. It is not a limit that is unique to the Dove either, as there are RPM and Boost limits associated with most of the other old aircraft we get to fly. It's not even an in-line thing as it applies to Twin Pioneer, Pembroke, Prentice, Anson, and several others.
I guess it's a field of knowlege that isn't getting any bigger, so I would be grateful of any insight you may be able to offer.:ok:
Thanks in advance.
Pimp Leader
I am in the process of writing a de Havilland Dove/Devon ops manual so that our company can operate it on our JAR AOC. As the Dove is one of the aircraft I'm lucky enough to fly, I am fairly familiar with it, but I do have one question which I'm hoping an old piston aficionado will be able to answer for me. :hmm:
It concerns the aircraft's automatic mixture control funnily enough. Why does the flight manual give not only a Boost Limit but also a RPM limit when stating it's 'Maximum Weak' mixture setting:sad: . From my Layman's standpoint, I would assume that the automatic leaning is a function of the Carburettor and I'm not sure how Prop/Engine RPM effects it. It is not a limit that is unique to the Dove either, as there are RPM and Boost limits associated with most of the other old aircraft we get to fly. It's not even an in-line thing as it applies to Twin Pioneer, Pembroke, Prentice, Anson, and several others.
I guess it's a field of knowlege that isn't getting any bigger, so I would be grateful of any insight you may be able to offer.:ok:
Thanks in advance.
Pimp Leader