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CHAPTER 5

MAIN ROTOR, TAIL ROTOR, AND FLIGHT CONTROL SYSTEM

5.1.

State the major components of the main rotor system.

1.

Splined trunnion

2.

Yoke

3.

Tension torsion-straps

4.

Blade grips

5.

Pitch change horns

6.

Flap restraint assembly (kit)

7.

Main rotor blades

5.1.1.

Described the design of the main rotor system.

Two bladed, semi-rigid, flapping type with an underslung hub

5.1.2.

State the purpose of the splined trunnion.

Provides the flapping axis for the main rotor and a mounting point for the yoke assembly.

5.1.3.

State the type of mounting used between the trunnion and mast of the main rotor.

Splined mounted to the mast

5.1.4.

State the purpose of preconing.

2.25o of preconing, helps relieve bending stress of he yoke, blade grips, and root of main Rotor Blades.

5.1.5.

State the purpose of the tension torsion strap.

Connects blade grips to the yoke assembly and absorb centrifugal forces while allowing for twist to permit pitch change action.

5.1.6.

Described the purpose of the latch bolt.

The horizontal latch bolt connects the blade grips to the tension torsion strap.

5.1.7.

Described the method used to ensure high rotational inertia for autorotations.

During construction weights are added to the tip and mid-span of each main rotor blade.

5.1.8.

State the purpose of the flap restraint kit.

Limits the amount of flapping at low rotor RPM (below 25-32% Nr)

5.1.8.1.

Described the operation of the flap restraint kept.

At low RPM, springs hold the restraint arms in place and prevent excessive flapping.  As RPM increases, flyweights overcome spring tension (at 25-32% Nr) and restraint arms move allowing full flapping motion.

5.1.9.

State the need for a rotor break.

13

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