Flight Training - July 2011 - 38
WEATHER
By Jack Williams
If flying in a high density altitude area, be sure the airplane’s weight is below 90 percent of maximum gross weight.
HIGH HUMIDITY LOWERS YOUR PERSONAL PERFORMANCE MORE THAN YOUR AIRPLANE’S
HOT, HUMID, AND DANGEROUS
I
f you had driven in an air-conditioned car to the Newton, Iowa, Municipal Airport for an early afternoon flight on June 14, 2010, you might have thought it would be a great day to fly. A few clouds were scattered around the sky, 2,700 feet above the airport, and the visibility was at least 10 miles.
HEAT AND YOUR BODY You feel hotter on a humid day than on a dry day with the same temperature because humidity slows down the evaporation of perspiration from your body. Perspiration is nature’s air conditioning. When it evaporates, it carries heat away—which keeps your body from overheating, with potentially deadly results. The National Weather Service calculates the “apparent temperature” (how hot it feels) using the temperature and humidity. The NWS does this as a way to alert people when the heat is particularly dangerous. In fact, NWS statistics show that heat causes more deaths each year
At the airport you began to have second thoughts. Getting out of your car was like walking into a pizza oven. At 2:15 that afternoon the temperature was 95 degrees, but the humidity made it feel even hotter. You were wilted after walking a couple of hundred feet to the FBO’s office. You stay in shape by running, but not on days like this. Weather like this saps my strength; what does it do to my airplane? you wonder. Then you recall learning about something called density altitude—which you found confusing while studying for a knowledge test. Maybe I should look into this before starting the preflight.
38 /
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Flight Training - July 2011
Table of Contents for the Digital Edition of Flight Training - July 2011
Flight Training - July 2011
Contents
President’s Perspective
Right Seat
Letters
The Wind in Your Hair
This Weekend
Success Story What It Looks Like
ASI News Member Products
Tech Tip
Since You Asked
AOPA Action
Final Exam
AOPA Action
News
Insights
Flying Carpet
Emergency Practice
I Love Low and Slow
Technique
Weather
Checkride
Flight Lesson
Rotorworld
Career Advisor
Tech Talk
Get Inside the Checklist
Nothing to See Here
Ultimate Communicators
Advertiser Index
Debrief
Flight Training - July 2011 - Flight Training - July 2011
Flight Training - July 2011 - Cover2
Flight Training - July 2011 - Contents
Flight Training - July 2011 - 2
Flight Training - July 2011 - 3
Flight Training - July 2011 - President’s Perspective
Flight Training - July 2011 - 5
Flight Training - July 2011 - Right Seat
Flight Training - July 2011 - 7
Flight Training - July 2011 - Letters
Flight Training - July 2011 - 9
Flight Training - July 2011 - The Wind in Your Hair
Flight Training - July 2011 - 11
Flight Training - July 2011 - This Weekend
Flight Training - July 2011 - Success Story What It Looks Like
Flight Training - July 2011 - ASI News Member Products
Flight Training - July 2011 - Tech Tip
Flight Training - July 2011 - Since You Asked
Flight Training - July 2011 - 17
Flight Training - July 2011 - AOPA Action
Flight Training - July 2011 - Final Exam
Flight Training - July 2011 - AOPA Action
Flight Training - July 2011 - 21
Flight Training - July 2011 - News
Flight Training - July 2011 - Insights
Flight Training - July 2011 - Flying Carpet
Flight Training - July 2011 - 25
Flight Training - July 2011 - Emergency Practice
Flight Training - July 2011 - 27
Flight Training - July 2011 - 28
Flight Training - July 2011 - 29
Flight Training - July 2011 - 30
Flight Training - July 2011 - 31
Flight Training - July 2011 - I Love Low and Slow
Flight Training - July 2011 - 33
Flight Training - July 2011 - 34
Flight Training - July 2011 - 35
Flight Training - July 2011 - Technique
Flight Training - July 2011 - 37
Flight Training - July 2011 - Weather
Flight Training - July 2011 - 39
Flight Training - July 2011 - 40
Flight Training - July 2011 - Checkride
Flight Training - July 2011 - 42
Flight Training - July 2011 - 43
Flight Training - July 2011 - Flight Lesson
Flight Training - July 2011 - Rotorworld
Flight Training - July 2011 - Career Advisor
Flight Training - July 2011 - 47
Flight Training - July 2011 - Tech Talk
Flight Training - July 2011 - Get Inside the Checklist
Flight Training - July 2011 - Nothing to See Here
Flight Training - July 2011 - Ultimate Communicators
Flight Training - July 2011 - Advertiser Index
Flight Training - July 2011 - 53
Flight Training - July 2011 - 54
Flight Training - July 2011 - 55
Flight Training - July 2011 - Debrief
Flight Training - July 2011 - Cover3
Flight Training - July 2011 - Cover4
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