The throttle was broken and the mixture control knob was in its full-rich
And, be aware that with prolonged ground operation at full-rich
mixture and a low RPM, spark plug fouling is encouraged, even with a perfectly adjusted idle mixture.
The fact that we all had full-rich
lives before this did not detract from our determination to make the organization healthy and successful and to have a successful convention.
Primary students flying trainers back then were told to put the mixture control into the full-rich
position and leave it there until shutting down, at least until they began to fly cross-countries.
For max power cruise, the manual recommends smoothly reducing the full-rich
mixture to a fuel flow between 16 and 17.6 GPH--APS grads will recognize this as "the big mixture pull." To set economy cruise, the pilot merely reduces MAP to 24 inches with fuel flows between 10 and 14.5 GPH.
To continue his cross-country trip, he safety-wired the carburetor's mixture control arm in the full-rich
The engine priming procedure calls for the throttle to be opened 1/4 of an inch, the fuel pump to be turned on and the mixture to be moved from the idle cut-off posit ion to full-rich
position for 4-7 seconds, then returned to idle cut-off.
Operating an engine rich of peak is easy: just leave the mixture control at its full-rich
For example, go full-rich
for altitude changes then back to leaned and calculations can quickly become questionable--if not wholly moot--particularly, as we know has happened, when repeated unplanned changes helps you forget to lean again.
Generally, unless there's a POH recommendation to do it in some other sequence, the order is: full-rich
mixture, full throttle, carb heat to "cold" position.
The engine is rated at full-rich
, takeoff power and leaning it from that mixture results in more than rated power and higher than designed internal cylinder pressures.
He reduced throttle, turned the fuel pump on and noted there was fuel pressure, then increased throttle, placed the mixture control to the full-rich
position, moved the fuel selector to the right tank, and pumped the primer but was unable to restore engine power.