Engine controls. The throttle control lever at the left of the quadrant at the top of the pedestal slides in a gate marked CLOSED and OPEN. The lever is connected by a flexible cable and conduit control to the carburetor throttle valve. A friction control below the throttle lever prevents throttle creep when rotated clockwise. The fuel air mixture ratio is manually determined through the mixture control lever at the right of the quadrant. Reading from the rear to the front, positions marked on the quadrant gate are: IDLE CUT-OFF, FULL LEAN and FULL RICH. A friction control knob below the control lever prevents the control from creeping and permits to set and permits to set any intermediate position, when tightened clockwise. Conventional engine instrument are mounted on a panel above the engine controls quadrant. They consist of; a tachometer, a manifold pressure gage, a cylinder head temperature gage, a carburetor mixture temperature gage, an oil pressure gage, an oil temperature gage and a fuel pressure gage. The tachometer indicator is operated by an electrical generator driven by the engine. A triple indicator fuel contents gage and a clock are also located on the engine instrument panel. The engine ignition switch is located on the starter panel below the pilot’s flight instrument panel. The switch is marked OFF, R, L and BOTH. The carburetor hot air control lever is located on the left side of the base of the pedestal and is mechanically linked to a barrel valve in the carburetor air intake. When the lever is in the COLD position, cold ram air enters the carburetor through the shielded air intake. As the lever is moved downwards towards the HOT position, the barrel valve progressively closes the ram air intake while tit opens another duct. This second carburetor air duct allows heated air from the inside of a heat exchanger muff which surrounds a section of the engine exhaust collector, to mix with the cold ram air before deliver y to the carburetor. Thus, intermediate positions of the lever between fully up and fully down give varying carburetor air intake temperatures. With the carburetor air control lever in ht HOT position, the ram air intake is fully closed and hot air from the heat exchanger muff only is ducted to the carburetor. The resulting mixture temperature is indicated on the carburetor mixture temperature gage.
Posted on: Sun, 14 Sep 2014 16:30:39 +0000
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