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DCS: UH-1H Huey

   

DCS: UH-1H Huey
Introduction
UH-1H - General design and mission
Flight dynamics model
3D model and liveries
Audio
Cockpit
Instrument Panel
Central Pedestal
Overhead Console
Flight control system
Cyclic Control System
Collective Control System
Tail Rotor Control System
Force Trim System
Engine and power train systems
Engine Fuel Control System
Engine Oil Supply System
Governor RPM ("beep") Switch
Droop Compensator
Power Train System
Armament
M23 Armament Subsystem
M21 Armament Subsystem
Screenshots

Overhead Console

The Overhead Console contains controls for internal and external lighting, electrical power, and others. All of these controls are fully animated and functional in DCS: UH-1H Huey with the single exception of the Cabin Heating control panel, which is animated and can be configured, but has no function in the simulation.

DCS: UH-1H Huey


Flight control system

The flight control system is a hydraulically-assisted positive mechanical type, actuated by conventional helicopter controls. Complete controls are provided for both pilot and copilot. The system includes a cyclic system, collective control system, tail rotor system, force trim system, synchronized elevator, and a stabilizer bar.



Cyclic Control System

The system is operated by the cyclic stick movement. Moving the stick in any direction will produce a corresponding movement of the helicopter which is a result of a change in the plane of rotation of the main rotor. The pilot cyclic contains the cargo release switch, radio ICS switch, armament fire control switch, hoist switch and force trim switch. Desired operating friction can be induced into the control stick by hand tightening the friction adjuster.

DCS: UH-1H Huey

Synchronized Elevator

The synchronized elevator is located on the tailboom. It is connected by control tubes and mechanical linkage to the fore-and-aft cyclic system. Fore-and-aft movement of the cyclic control stick will produce a change in the synchronized elevator attitude. This improves controllability within the center of gravity (cg) range.

Stabilizer Bar

The stabilizer bar is mounted on the main rotor hub trunnion assembly in a parallel plane, above and at 90 degrees to the main rotor blades.

Open big picture

The gyroscopic and inertial effect of the stabilizer bar will produce a damping force in the rotor rotating control system and thus the rotor. When an angular displacement of the helicopter/mast occurs, the bar tends to remain in its trim plane. The rate at which the bar rotational plane tends to return to a position perpendicular to the mast is controlled by the hydraulic dampers. By adjusting the dampers, positive dynamic stability can be achieved, and still allow the pilot complete responsive control of the helicopter.



Collective Control System

The collective pitch control lever controls vertical flight. When the lever is in full down position, the main rotor is at minimum pitch. When the lever is in the full up position, the main rotor is at maximum pitch. The amount of lever movement determines the angle of attack and lift developed by the main rotor, and results in ascent or descent of the helicopter. Desired operating friction can be induced into the control lever by hand-tightening the friction adjuster. A grip-type throttle and a switch box assembly are located on the upper end of the collective pitch control lever. The pilot switch box contains the starter switch, governor rpm switch, engine idle stop release switch, and landing light/searchlight switches. A collective lever down lock is located on the floor below the collective lever. The copilot collective lever contains only the grip-type throttle, governor rpm switch, and starter switch when installed. The collective pitch control system has built-in breakaway (friction) force to move the stick up from the neutral (center of travel) position of eight to ten pounds with hydraulic boost ON.

DCS: UH-1H Huey


Tail Rotor Control System

The tail rotor control system is operated by pilot/copilot anti-torque pedals. Pushing a pedal will change the pitch of the tail rotor blades, resulting in directional control. Pedal adjusters are provided to adjust the pedal distance for individual comfort. A force trim system is connected to the directional controls.

Open big picture


Force Trim System

Force centering devices are incorporated in the cyclic controls and directional pedal controls. These devices are installed between the cyclic stick and the hydraulic servo cylinders, and between the anti-torque pedals and the hydraulic servo cylinder. The devices furnish a force gradient or "feel" to the cyclic control stick and anti-torque pedals. A FORCE TRIM ON/OFF switch is installed on the miscellaneous control panel to turn the system on or off. These forces can be reduced to zero by pressing and holding the force trim push-button switch on the cyclic stick or moving the force trim switch to OFF.



Engine and power train systems

The power system of the UH-1H consists of a single Textron Lycoming T53-L-13B turboshaft engine with a maximum output power of 1100kW/1400 hp.

DCS: UH-1H Huey


Engine Fuel Control System

Engine Mounted Components

The fuel control assembly is mounted on the engine. It consists of a metering section, a computer section and an overspeed governor.

The metering section is driven at a speed proportional to N1 speed. It pumps fuel to the engine through the main metering valve or if the main system falls through the emergency metering valve which is positioned directly by the twist grip throttle.

The computer section determines the rate of main fuel delivery by biasing main metering valve opening for N1 speed, inlet air temperature and pressure, and throttle position. It also controls the operation of the compressor air bleed and operation of the variable inlet guide vanes.

The overspeed governor is driven at a speed proportional to N2 speed. It biases the main metering valve opening to maintain a constant selected N2 RPM.

DCS: UH-1H Huey

Power Controls (Throttles)

Rotating the pilot or copilot twist grip-type throttle to the full open position allows the overspeed governor to maintain a constant RPM.

Rotating the throttle toward the closed position will cause the rpm to be manually selected instead of automatically selected by the overspeed governor. Rotating the throttle to the fully closed position shuts off the fuel.

An idle stop is incorporated in the throttle to prevent inadvertent throttle closure. To bypass the idle detent press the IDLE REL switch and close the throttle.

Governor Switch

The GOV switch is located on the ENGINE control panel. AUTO position permits the overspeed governor to automatically control the engine rpm with the throttle in the full open position. The EMER position permits the pilot or copilot to manually control the rpm. Because automatic acceleration, deceleration, and overspeed control are not provided with the GOV switch in the EMER position, control movements must be smooth to prevent compressor stall, overspeed, over-temperature, or engine failure.

Note. If GOV switch is in EMER position and throttle is full opened, main rotor rpm can exceed the limit, so pilot should control engine and rotor rpm manually by rotating the throttle twist grip.




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