A helicopter rotor drive system features a control system and rotary blades. The rotor system is the rotating part of a helicopter which generates lift and consists of a mast, hub, and rotary blades. The blades are attached to the hub using various nuts and bolts. There are three main types of rotor drive systems: semirigid, rigid, and fully articulated. The classifications are based upon how the motor blades are attached and move in accordance to the main rotor hub.
In semirigid rotor systems, two blades are attached to a central hub. The hub can tilt according to the main rotor shaft using a teetering hinge. The teetering hinge is significant as it allows one blade to flap up and the other to flap down. This decreases the lead and lag forces on the blades. Semirigid rotor systems are simple, however the downside is that the reaction to control input is not as quick as articulated rotor systems.
In rigid rotor systems the blade roots are rigidly attached to the rotor hub. As they do not have hinges, rigid rotor systems rely on the bending of the rotor blades. The blades are unable to flap or utilize lead and lag movements. Despite these factors, rigid rotor systems are relatively straightforward in design and principle. Rigid rotor systems are considered to be the happy medium between semi rigid motor systems and fully articulated systems. A disadvantage of rigid rotor systems is the higher vibration levels that compromises the overall control and comfort of the helicopter.
FFully articulated rotor systems allow for more movement in the blades. The blades have lead/lag, independent flap capabilities and the ability to feather. Fully articulated rotor systems have two or more main rotor blades. As the rotor spins, each blade responds to inputs from the control system to enable aircraft control.
Newer rotor systems use elastomeric bearings, which are arrangements of rubber and steel that can allow motion in two axes. Compared to metal bearings, elastomeric bearings require less maintenance as they wear better.
Part No | Description | RFQ |
---|---|---|
A130-39 | Spacer | RFQ |
D210-4 | Nut | RFQ |
C167-5 | Housing | RFQ |
C215-029 | O-Ring (lubricate with A257-1 grease) | RFQ |
NAS1149D0316J | Washer | RFQ |
B161-4 | Spirap | RFQ |
D049-4 | Harness Assembly | RFQ |
C251-1 | Shaft - Main Rotor Drive | RFQ |
NAS1149FN816P | Washer | RFQ |
MS20002-24 | Washer (against hub) | RFQ |
MS21075L3E | Nutplate | RFQ |
MS21042L5 | Nut | RFQ |
D774-4 | Spring (Associated Spring part no. C0420-063-2000S) | RFQ |
C191-1 | Block | RFQ |
V3-1001 | Switch (use B158-2 or -3 around terminals) | RFQ |
C270-1 | End Cover | RFQ |
C264-1 | Housing | RFQ |
C273-1 | Roof Panel | RFQ |
MS20995C41 | 0.041 in. dia. Safety Wire | RFQ |
NAS1352-4-16 | Screw | RFQ |
NAS1149F0632P* | Washer | RFQ |
B033-6 | Knob Assembly - Rotor Brake | RFQ |
MS20995C32 | 0.032 in. dia. Safety Wire | RFQ |
AN316-5R | Nut | RFQ |
AN526C832R6 | Screw | RFQ |
C263-2 | Sump (requires A215-222 o-ring) | RFQ |
NAS6603-10 | Bolt | RFQ |
MS27039C0812 | Screw | RFQ |
B158-12 | Heat Shrink | RFQ |
D113-1 | Link | RFQ |
MS3367-5-9 | Ty-Rap | RFQ |
C966-3 | Seal | RFQ |
B289-3 | Screw | RFQ |
AGC-1.5 | Fuse (1.5 amp, for 28-volt ships) | RFQ |
B263-4 | Socket | RFQ |
C966-5 | Seal | RFQ |
MS24566-1B | Pulley (or AN210-1A) | RFQ |
C195 | Yoke | RFQ |
C653-3* | Mount | RFQ |
NAS1149F0432P | Washer (or NAS1149F0463P to fill gap) | RFQ |
C020-1 | Upper Frame | RFQ |
MS27039C1-11 | Screw | RFQ |
NAS6603-40 | Bolt | RFQ |
C006-8* | Main Rotor Gearbox and Mast Assembly | RFQ |
C168-4 | Retainer | RFQ |
B270-10 | Adhesive | RFQ |
C051-1 | Actuator Assembly (14-volt ships) | RFQ |
NAS9301B-4-02 | Rivet | RFQ |
B563-2 | Sight Gage | RFQ |
B158-6 | Heat Shrink (around fuse holder) | RFQ |
MS24665-134 | Cotter Pin | RFQ |
C493-1 | Sheave - Lower | RFQ |
C251-2 | Shaft - Main Rotor Drive | RFQ |
C947-1 | Flex Plate Assembly | RFQ |
C018-3R | C018-3 Clutch Assembly (overhaul exchange; includes new C166-4 shaft) | RFQ |
C182-1 | Nut | RFQ |
NAS6606-5 | Bolt | RFQ |
110-3 | Telatemp (temperature recorder 180°-230°F) | RFQ |
A215-029 | O-Ring | RFQ |
A7260 | Chip Detector | RFQ |
AN320-8 | Nut (B270-11 on threads) | RFQ |
D262-11 | Fuse Holder | RFQ |
MS20074-04-04 | Bolt (earlier non-hydraulic R44s) | RFQ |
NAS6603-11 | Bolt | RFQ |
B263-3 | Pin | RFQ |
MS35206-228 | Screw | RFQ |
C345-1 | Strut Weldment | RFQ |
NAS620-10L | Washer | RFQ |
A130-41 | Spacer | RFQ |
A130-40 | Spacer | RFQ |
B570-1 | Magnet Assembly | RFQ |
AN742-3 | Clamp | RFQ |
AN3-41A | Bolt | RFQ |
C007-5R | C007-5 Shaft and Bearing Assembly (overhaul exchange) | RFQ |
MS21042L08 | Nut | RFQ |
C257-2 | Cover | RFQ |
E0240-037-3500S | Spring | RFQ |
C796-2 | Shim (3 maximum per aft pad) | RFQ |
NAS1149F0432P | Washer | RFQ |
NAS6604-21 | Bolt | RFQ |
MS24566-1B | Pulley (supersedes AN210-1A) | RFQ |
A185-2 | Bracket | RFQ |
B330-16 | Palnut | RFQ |
B033-6 | Knob Assembly (includes knob and chain) | RFQ |
NAS6603-8 | Bolt | RFQ |
A257-2LT | Oil - Gearbox (one-liter bottle) | RFQ |
MS27039C1-07 | Screw | RFQ |
D118-1 | Bracket Assembly | RFQ |
B263-19* | Housing | RFQ |
C006-7* | Main Rotor Gearbox and Mast Assembly | RFQ |
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