AOPA Pilot Magazine - July 2021 - 93

Each curve on a
4 STEPS TO PURCHASING
YOUR
graph reveals the
way in which, say,
climb rate depends
on atmospheric
conditions and I
confess that my inner
geek delights in such
visualizations.
makes my BS meter sound for a couple
reasons. First, while that extra 750 feet of
runway may get us above any of the obstacles
adjacent to the runway, it's good to know
that not all obstacles around an airport are
just 50 feet high. Many of the trees surrounding
my own airport are actually 100 feet
high. Second, the panel does not take winds
into account. For example, if we had taken
off with a tailwind, this panel could greatly
underestimate the distance needed to clear
a 50-foot obstacle.
To ensure I have the appropriate performance
to safely depart an airport, I prefer to
use the climb rate performance chart along
with the FAA's Climb/Descent Chart (see
" There's a Chart for That, " February 2019
AOPA Pilot) to make such estimates. The
LARAMIE ONE obstacle departure procedure
for the airport says that if we can
maintain a 200 foot-per-nautical-mile climb
gradient and follow the procedure, we can
depart with appropriate obstacle clearance.
This takeoff performance chart tells the
story of takeoff distance as it is influenced
by atmospheric conditions, aircraft weight,
winds, and obstacles. Missing components
include humidity, engine wear, and my suboptimal
piloting technique so it's important
to include a healthy safety buffer. After I calculate
a value for required takeoff distance, I
always ensure that the runway from which I
am departing is at least twice as long as I calculated.
It's a rule that has served me well in
my aviation career.
AOPA
CATHERINE CAVAGNARO is an aerobatics
instructor (aceaerobaticschool.com) and
professor of mathematics at Sewanee:
The University of the South.
aopa.org/pilot AOPA PILOT | 93
FIRST AIRCRAFT
1
2
Understand your
financial picture.
3
4
Apply and get
approved.
Negotiate the
purchase.
Close on your
first Aircraft.
Call for a quote today!
1.844.674.2761
AOPAFinance.org/FirstTimeBuyer

http://www.AOPAFinance.org/FirstTimeBuyer http://www.aceaerobaticschool.com http://www.aopa.org/pilot

AOPA Pilot Magazine - July 2021

Table of Contents for the Digital Edition of AOPA Pilot Magazine - July 2021

Contents
AOPA Pilot Magazine - July 2021 - Intro
AOPA Pilot Magazine - July 2021 - Cover1
AOPA Pilot Magazine - July 2021 - Cover2
AOPA Pilot Magazine - July 2021 - Contents
AOPA Pilot Magazine - July 2021 - 2
AOPA Pilot Magazine - July 2021 - 3
AOPA Pilot Magazine - July 2021 - 4
AOPA Pilot Magazine - July 2021 - 5
AOPA Pilot Magazine - July 2021 - 6
AOPA Pilot Magazine - July 2021 - 7
AOPA Pilot Magazine - July 2021 - 8
AOPA Pilot Magazine - July 2021 - 9
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AOPA Pilot Magazine - July 2021 - 20
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AOPA Pilot Magazine - July 2021 - 30
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AOPA Pilot Magazine - July 2021 - 65
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AOPA Pilot Magazine - July 2021 - Cover3
AOPA Pilot Magazine - July 2021 - Cover4
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