Specifications

[P-51D Mustang]

DCS

EAGLE DYNAMICS

Carburetor Air Controls

Cold outside ram air enters a duct in the nose just below the propeller spinner and moves toward the

carburetor for induction into the engine. In case of dust or icing conditions, a door at the forward end

of the duct can be closed mechanically from the cockpit using the Ram Air Control lever to force the

air to enter through perforated side panels (and filters) on each side of the engine cowl. An additional

door further down the duct can be opened using the Hot Air Control lever to allow warm air from the

engine compartment to enter the carburetor. If hot air is used, the Ram Air Control lever should be

set to UNRAMMED FILTERED AIR to prevent cold ram air from entering the carburetor.

Figure 67: Carburetor Air Controls

RAM AIR CONTROL LEVER. The Ram Air Control lever opens and closes the ram air door in the

forward section of the carburetor air duct. The lever has two positions: RAM AIR and UNRAMMED

FILTERED AIR. In the RAM AIR position, the front intake is open and ram air enters the duct toward

the carburetor. In the UNRAMMED FILTERED AIR position, the ram air door is closed and air passes

through the side filters to the carburetor. Normal flying operations should be conducted using ram air

(lever set to RAM AIR). UNRAMMED FILTERED AIR can be used in severe icing or dust conditions.

HOT AIR CONTROL LEVER. The Hot Air Control lever has two positions: NORMAL and HOT AIR.

When set to NORMAL, the hot air door is closed and either ram air or unrammed filtered air enters

the carburetor, depending on the Ram Air Control lever setting. When set to HOT AIR, the hot air

door is open and warm air from the engine compartment enters the carburetor. Note, the warm air

door is spring-loaded and will open automatically in case of icing or other foreign object obstruction

due to the suction on the carburetor.

Do not use HOT AIR at altitudes above 12,000 ft. Doing so may affect the carburetor's

altitude compensation and result in an overly lean fuel mixture.

Ram Air Control

Hot Air Control