Flight Training - November/December 2020 - 12

PREFLIGHT WHAT AM I?

BY IAN J. TWOMBLY

PICK YOUR POWER
Types of turbine engines

Turbofan
This is what most people
think of when they think of a
jet engine. Almost all modern
commercial jet engines are
turbofans, incorporating a
high bypass ratio.

LIGHT THE FIRES

Turboprop
Turboprop engines are jet
engines with the ﬁrst fan
stage in the form of a propeller. The drive shaft is often
connected to a gearbox that
allows the propeller to turn
more slowly than the compressor stage. Turboprops
are more fuel efficient than
turbofans.

INSIDE A TURBINE ENGINE

FLYING AN AIRCRAFT IS COOL. FLYING ONE WITH A JET ENGINE? EVEN COOLER. JET

ian.twombly@aopa.org

12

FLIGHT TRAINING NOVEMBER/DECEMBER 2020

Turboshaft
Primarily used on helicopters, turboshaft engines are
turbines with a drive shaft
that is connected to a fan in
the back of the engine. This
means the power drives a
shaft that is connected to a
gearbox that turns the rotors.

MIKE FIZER

engines enable an aircraft to ﬂy higher and faster. Turbines are also more reliable than
piston engines, which can make ﬂying safer, especially over water or rough terrain.
Jet engines compress air and mix it with fuel to produce thrust, just as a piston
engine does. But in a turbine the air is compressed as it moves through a series of fan
blades, then it is ignited. That hot gas expands greatly and is pushed out the back of the
compressor, through another series of fans. Like water over a big wheel these exhaust
fans are connected to the compressor, rotating it. That high-velocity air being pushed
out the back is what pushes the jet forward.
Newer jet engines are efficient and feature a high bypass ratio. Through a large initial
fan, they take in copious amounts of air, only some of which is mixed with fuel and
burned. The rest is compressed and squeezed out the small back nozzle. By taking in
more air the engine can produce the same thrust with less fuel burn.

Flight Training - November/December 2020

Table of Contents for the Digital Edition of Flight Training - November/December 2020

Contents
Flight Training - November/December 2020 - Intro
Flight Training - November/December 2020 - Cover1
Flight Training - November/December 2020 - Cover2
Flight Training - November/December 2020 - Contents
Flight Training - November/December 2020 - 2
Flight Training - November/December 2020 - 3
Flight Training - November/December 2020 - 4
Flight Training - November/December 2020 - 5
Flight Training - November/December 2020 - 6
Flight Training - November/December 2020 - 7
Flight Training - November/December 2020 - 8
Flight Training - November/December 2020 - 9
Flight Training - November/December 2020 - 10
Flight Training - November/December 2020 - 11
Flight Training - November/December 2020 - 12
Flight Training - November/December 2020 - 13
Flight Training - November/December 2020 - 14
Flight Training - November/December 2020 - 15
Flight Training - November/December 2020 - 16
Flight Training - November/December 2020 - 17
Flight Training - November/December 2020 - 18
Flight Training - November/December 2020 - 19
Flight Training - November/December 2020 - 20
Flight Training - November/December 2020 - 21
Flight Training - November/December 2020 - 22
Flight Training - November/December 2020 - 23
Flight Training - November/December 2020 - 24
Flight Training - November/December 2020 - 25
Flight Training - November/December 2020 - 26
Flight Training - November/December 2020 - 27
Flight Training - November/December 2020 - 28
Flight Training - November/December 2020 - 29
Flight Training - November/December 2020 - 30
Flight Training - November/December 2020 - 31
Flight Training - November/December 2020 - 32
Flight Training - November/December 2020 - 33
Flight Training - November/December 2020 - 34
Flight Training - November/December 2020 - 35
Flight Training - November/December 2020 - 36
Flight Training - November/December 2020 - 37
Flight Training - November/December 2020 - 38
Flight Training - November/December 2020 - 39
Flight Training - November/December 2020 - 40
Flight Training - November/December 2020 - 41
Flight Training - November/December 2020 - 42
Flight Training - November/December 2020 - 43
Flight Training - November/December 2020 - 44
Flight Training - November/December 2020 - 45
Flight Training - November/December 2020 - 46
Flight Training - November/December 2020 - 47
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Flight Training - November/December 2020 - 49
Flight Training - November/December 2020 - 50
Flight Training - November/December 2020 - 51
Flight Training - November/December 2020 - 52
Flight Training - November/December 2020 - 53
Flight Training - November/December 2020 - 54
Flight Training - November/December 2020 - 55
Flight Training - November/December 2020 - 56
Flight Training - November/December 2020 - 57
Flight Training - November/December 2020 - 58
Flight Training - November/December 2020 - 59
Flight Training - November/December 2020 - 60
Flight Training - November/December 2020 - 61
Flight Training - November/December 2020 - 62
Flight Training - November/December 2020 - 63
Flight Training - November/December 2020 - 64
Flight Training - November/December 2020 - 65
Flight Training - November/December 2020 - 66
Flight Training - November/December 2020 - 67
Flight Training - November/December 2020 - 68
Flight Training - November/December 2020 - 69
Flight Training - November/December 2020 - 70
Flight Training - November/December 2020 - 71
Flight Training - November/December 2020 - 72
Flight Training - November/December 2020 - Cover3
Flight Training - November/December 2020 - Cover4
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