Marine Bombing Squadron Six-Thirteen
October 1, 1943 - November 21, 1945
VMB-613 Insignia

PBJ-1C General Configuration - Starboard View

PBJ-1C

General Characteristics:  The North American PBJ-1C medium bomber airplane was a mid-wing land-based monoplane powered by two Wright Cyclone engines.  Characteristic features included a tricycle landing gear, and a double fin and rudder empennage.  In addition to five .50 caliber machine guns, the PBJ-1C was also equipped to carry bombs, depth charges, or an aerial torpedo.

General Configuration:  A series of scale drawings depicting a typical aircraft operated by VMB-613 is provided at the following link:  PBJ-1C Scale Drawing

Basic Model:  North American B-25C-20 and B25C-25.

Wingspan:  67 feet 6 inches.

Wing Area:  610 square feet.

Length:  53 feet 0 inches.

Height:  15 feet 9 inches.

Weight (Empty):  20,300 pounds.

Weight (Maximum Loaded):  34,000 pounds.

Maximum Speed:  247 knots (284 mph) at 15,000 feet.

Cruising Speed:  203 knots (233 mph).

Service Ceiling:  21,200 feet.

Range:  1,303 nautical miles (1,500 statute miles) with 3,000 pounds of bombs.

Crew:  Five - Pilot, Copilot, Navigator-Bombardier, Radio-Gunner, & Mechanic-Turret Gunner.

Flight Controls:  The rudders, elevators and ailerons were controlled by a redundant cable system so that the loss of any one control cable would not seriously cripple the aircraft.  The rudders and ailerons were equipped with a combination booster and controllable trim tabs.  The elevators had controllable trim tabs which were set for no boost.  A bungee installed in the elevator control system reduced stick loads.  A locking system effecting all of the control surfaces simultaneously was controlled by a handle on the floor in front of the pilot's control column.  

Landing Gear:  The landing gear was hydraulically operated with the main gear retracting into the engine nacelles and the nose gear into the fuselage.  Doors cover the gear openings in both the retracted and extended positions.  The swivel-type nose gear incorporated a centering device that operated when the strut was full extended (wheel off the ground).  A hydraulic shimmy damper on the strut resisted side loads that occurred on taxiing, take-off, and landing to prevent sudden movements of the wheel.  The nose wheel could also be released from the shimmy damper for the purpose of towing.

Wheels:  The main wheels were of the smooth-contour type and were 47 inches in diameter.  The nose wheel was a smooth contour 30-inch tire and was equipped with a dual-seal inner tube for protection against blowouts and punctures.

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