Performance during take-off i.e will taking off from a short airstrip at cool day temps. and hot temps be affected by the temps.?
2007-09-08 23:27:10 · 7 answers · asked by Anonymous in Cars & Transportation ➔ Aircraft
Air density. Air expands with an increase in temperature. This will mean that the air is less dense.
The higher the temperature the farther the air molecules are apart. This means that less air molecules are sucked into the engines on a hot day than a cool day in turn meaning less fuel/air ratio.
More denser air means more molecules flowing over the wings in turn more lift.
High and hot is the least dense air therefore takeoff performance will be poor.
If you still cant grasp the principal e-mail me I'll explain it in further detail.
2007-09-08 23:36:49 · answer #1 · answered by Charles 5 · 2⤊ 0⤋
Also affects TAS/Mach at altitude and, in some aircraft, whether you can climb to a given altitude (when considered in conjunction with weight), also can impact Part 25 second segment climb performance, thereby requiring less weight, cooler temps, different flap setting, and/or longer runway in order to comply.
In general, as temps increase, performance decreases, for mostly aerodynamic reasons associated with air density and the generation of lift.
2007-09-09 16:51:22 · answer #2 · answered by MALIBU CANYON 4 · 0⤊ 0⤋
Practical performance example: I fly an old Beech single in Ontario, Canada. On a cold, clear, dry winter day with normal loading I can achieve a rate of climb of 800 feet per minute or so. In summer, with temperatures in the 30's (90s F) and high humidity, I might see 400 feet per minute and approx 250 feet is added to my takeoff distance.
2007-09-12 21:55:14 · answer #3 · answered by Rationalist 1 · 0⤊ 0⤋
Air density. Air expands with an increase in temperature. This will means that the air is less dense (Thinner).
The higher the temperature the farther the air molecules are apart. This means that less air molecules are sucked into the engines on a hot day than a cool day in turn meaning less fuel/air ratio. That's why a plane has a fuel air mixture knob on it, so you can adjust the mixture of air to fuel ratio for best horsepower and fuel burn economy.
It also means on hot days the propellers have to work harder to grab the air.
Denser air (colder air) means more molecules flowing over the wings in turn more lift and better performance.
On hot days the air is thinner therefore takeoff performance will be poor. You need more runway for takeoff on a hot day than you do on a cold day.
If you still don't get it, email Charles M. He'll explain it some more.
2007-09-09 15:12:07 · answer #4 · answered by Pilot boy 2 · 1⤊ 3⤋
Charles got it right as usual. I'll just add one thing. When we compute this density that he speeks of, we call it the "density altitude." Denver for example is about five thousand feet in airport elevation. On a hot summer day, the density altitude can exceed nine thousand feet. That's how high the airplane thinks it is when taking off.
2007-09-09 10:32:58 · answer #5 · answered by Anonymous · 3⤊ 0⤋
The speed of sound is a function of temperature, the colder the air is the slower the speed of sound. If you are farther from the ground (colder) you will reach the speed of sound at a lower speed. You will be able to fly faster nearer to the ground with a conventional airfoil.
2007-09-11 00:27:16 · answer #6 · answered by Anonymous · 0⤊ 0⤋
Also, humid air is less dense than dry air.
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2007-09-09 15:39:46 · answer #7 · answered by Robert L 7 · 1⤊ 1⤋