A Helicopter Components

A helicopter components

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1.A

Objective

Student will be introduced to helicopter components

Completion standards

Student will demonstrate an understanding of the different basic components of a helicopter.

Recommended study material

RFH Ch 1

Jeppesen 2-25, 2-31/2-33

Principles of flight p 72,73 189-192

Robinson 1-5,1-12

Equipment

Ipad

POH

Whiteboard/pens

Introduction

Today we will have a look at the different components of a helicopter

Overview

Airframe

Fuselage/Skids

Tail boom

Powerplant

Drive train

Cluth

Freewheeling unit

Main rotor

Swashplate assembly

Tail Rotor

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Development

Airframe

* Main structure of aircraft, skeleton

* Welded steel tubing

* Stainless steel firewall forward and above engine

Fuselage

* Aircrafts skin

* Aluminium mostly

* Some of fiberglass and thermoplastics, doors for example

Landing gear

Skids on R22

* Aluminium tubes

* Light and simple

* Hardened steel pads underneath

* Spring and yield, collapses on hard landing

* Play “helicopter drop test” to show skids yielding

Wheel type

* Common for heavy helicopters

Floats, water ops.

Skis, snow ops.

Tail boom

* Holding the tail rotor

* Riveted aluminum skin – monocoque design

* Skin carry the primary load

* Hollow

* Light

* Stinger to guard tail rotor from ground contact

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Powerplant

Piston engine in R22

* Also called reciprocating engine, same thing

* 4-stroke most common

* Intake, compression, combustion, exhaust

* Suck, squeeze, bang, blow

* Show picture, in back

* Cheap, less power to weight

* Open POH and look at descriptive data

* 1-5, 7-3

Turbine engine

* Compressor, combustion chamber, turbine

* Burns continuously, ignites only when starting engine

* More power to weight

* Expensive

Drive train

Transmits power from the engine to the rotor blades

* Lower sheave drives upper sheave

* Double V belts

* Upper sheave drives drive shaft

* Main rotor gearbox/transmission

* Transmits power to the main rotor

* Main rotor gearbox reduces 47 to 11

* Spiral Beveled gears

* Tail rotor gearbox/transmission