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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →A hot-air balloon rises when its burner heats the air inside the envelope, making that air less dense than the cooler air outside. Buoyancy can then lift the balloon’s full load. The burner helps control height; it does not steer the balloon horizontally. For that, pilots work with winds that may differ from one altitude to another.
Why a hot-air balloon rises
A balloon is a lighter-than-air aircraft. The Federal Aviation Administration defines a balloon as “a lighter-than-air aircraft that is not engine driven, and that sustains flight through the use of either gas buoyancy or an airborne heater.” A hot-air balloon is the type that uses an airborne heater.
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When the burner heats the air held inside the envelope, that air expands and becomes less dense than an equal volume of cooler surrounding air. The atmosphere pushes upward on the balloon through buoyancy. When that upward force exceeds the combined weight of the envelope air, balloon, equipment, pilot, and passengers, the balloon climbs. The flame does not push it upward like a rocket; the lift comes from the density difference. FAA, Piloted Balloons; FAA, Balloon Flying Handbook, Chapter 2.
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The greater the temperature difference between the air inside and outside, the greater the density contrast generally is, though actual lift also depends on the balloon’s loading and atmospheric conditions. As the balloon ascends, it tends toward an altitude where the upward force and total weight balance.
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What the main parts do
The FAA groups a hot-air balloon’s principal components as the envelope, heater system, and basket. Instruments, fuel tanks, and other equipment support flight.
| Part | Role |
|---|---|
| Envelope | Large fabric enclosure that contains the heated air and is carried along with it. |
| Burner or heater system | Adds heat to the envelope air, increasing its temperature and lift. |
| Basket | Carries the pilot, passengers, and equipment. |
| Supporting equipment | Includes items such as instruments and fuel tanks needed for flight. |
| Vent | Provides a temporary opening through which hot air can be released; the handbook describes it as closing automatically under upward pressure when not in use. |
Designs and approved operating procedures vary. The vent’s role here is a description of the system, not instructions for operating a balloon.
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What the burner does—and how the balloon changes height
The burner supplies heat to the air inside the envelope. Heating that air increases lift and supports a climb. As the air cools, lift decreases; releasing hot air through the vent hastens cooling and descent. The FAA puts it plainly: “To climb, the temperature in the envelope is raised by heating the air which creates more lift.”
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Why envelope air matters to the load
The envelope’s air is not weightless. It is part of the total load the buoyant force must support, along with the balloon’s components and equipment, pilot, and passengers. The FAA’s handbook gives a specific example: “The average 77,000 cubic foot hot air balloon contains an air mass that weighs over 3,000 pounds.” That is the handbook’s figure for its example, not a specification for every balloon.
How hot-air balloons steer
A hot-air balloon has no ordinary horizontal steering like an airplane or car. It travels with the surrounding air, so the wind determines its ground track. A pilot can influence the route indirectly by changing altitude: wind direction or speed may differ at another height, and the balloon may then move along a different track.
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That is influence, not a guarantee of a chosen direction or landing point. The balloon’s weight and momentum also limit how quickly it can respond to pilot actions. FAA, Balloon Flying Handbook, Chapter 2.
Operational guidance and scope
The FAA’s Advisory Circular AC 91-71, “Operation of Hot Air Balloons with Airborne Heaters,” was issued June 13, 1996, and is listed as active on the FAA’s page. It provides US guidance for safe and practical operation under applicable parts of 14 CFR Part 91; it is not a worldwide rule or a substitute for current aircraft manuals, regulations, or pilot training. FAA, AC 91-71.
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