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Engine smoke and level flight

dragonflightdesign
in PILOT’S Boeing B314 – The Clipper

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  • Commercial Member

I've had a small handful of off-forum queries as to why the engines smoke so much in level flight. In all cases it turned out that the person asking the question had the throttles open too far. The checklists for level flight state "Close the throttles to 29" MP or less". At 29" MP in calm weather you will be doing something in the region of 110 mph which is way the wrong side of the green line and your fuel burn will be extremely high.  Throttle back to around 85-90 mph which is the speed used by B-314 aircrews as noted in the manual Part 1. This equates to around 24"-25" MP and 1900 RPM in calm weather.

As a side note, this also makes the gyropilot easier to use.

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