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Hot air airship made by Gefa-Flug

A thermal airship is an airship that generates buoyancy by heating air in a large chamber or envelope. The lower density of interior hot air compared to cool ambient air causes an upward force on the envelope. The most common example is the hot air balloon. An airship that uses steam would also qualify as a thermal airship.[1]

Other types of airships use a gas that is lighter than air at ambient temperature, such as helium, as a lifting gas.

Some airship designs that use a lighter-than-air lifting gas heat a portion of the gas, which is usually maintained in enclosed cells to gain additional lift. Heating the lifting gas causes expansion of the gas in order to further lower the density of the lifting gas, which results in greater lift.

Advantages and disadvantages[edit]

Thermal airships have the advantage of being much less expensive than helium-based airships. They are also routinely deflated after each flight and can be readily packed for storage and/or transport.

Hot air craft produce much less uplift per unit volume than helium- or hydrogen-filled craft (about 30% depending on air conditions). This necessitates lighter construction, with fewer controls and hence more difficulty in manoeuvring. This leads to:

  • lower airspeeds
  • difficulty in handling on the ground if the ground wind is above 5 knots
  • difficulty in steering, particularly at low airspeeds
  • lack of elevator (pitch) control, causing the airship to pitch up or down in response to changes in the throttle setting (a motion called 'porpoising').

In recent years, the steering of these ships has improved somewhat. The most successful approach has been to use higher pressure in the tail fin structures than in the rest of the envelope, or to use an internal structure (see below).

History[edit]

Skyacht Personal Blimp - another type of thermal airship

The first public flight of a hot air airship was made by Don Cameron (UK) in a Cameron D-96 at the Icicle Meet in January 1973. The aircraft reportedly took 3 years to develop.

Envelope structures[edit]

Most thermal airships are non-rigid. Some are pressurized. In some cases, the pressurized air is taken from a duct located behind the propeller. In other cases, the pressurized air comes from a separate fan.

In 2006, a new type of envelope employing a tensile membrane structure was developed by Skyacht Aircraft. This design uses an unpressurized envelope and an internal structure that uses ribs made of aluminium to keep the envelope in shape. When not in use, the structure folds up in a manner similar to an umbrella. The structure also permits the mounting of a steerable engine/propeller on the tail of the aircraft. The tail-mounted propeller provides for vectored thrust steering, allowing tight turns.[2]

Operation[edit]

Like hot air balloons, thermal airships are first inflated partially with cold (ambient temperature) air. Once the envelopes are sufficiently full, a propane burner is ignited and the inflation is completed using heated air.

See also[edit]

References[edit]

  1. ^ Steam Balloon JBFA Article
  2. ^ Youtube video of Skyacht

External links[edit]


Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Thermal_airship — Please support Wikipedia.
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5582 videos foundNext > 

Gefa Flug AS105GD Thermal Airship

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5582 videos foundNext > 

30 news items

Breitbart News (blog)

Breitbart News (blog)
Sun, 29 Jun 2014 05:52:15 -0700

A consortium of interested groups launched a giant airship to fly over the NSA's new snooping repository in Bluffdale, Utah. A 135 foot long thermal airship flew over the snoop headquarters last Friday with the message: “NSA Illegal Spying Below” with ...
 
Juneau Empire (subscription)
Tue, 11 Jun 2013 01:26:15 -0700

Mitchell Wenkus, Video Producer for Greenpeace, photographs their thermal Airship A.E. Bates as it flies over Juneau's harbor Saturday evening to bring attention to underwater canyons in the Bering Sea. The environmental group, with it's airship ...
 
MyNorthwest.com
Tue, 30 Aug 2011 05:45:00 -0700

Somewhere in Boeing's Phantom Works lab there's a crinkled-up piece of paper with the heading "Boeing Hybrid Thermal Airship." It's a massive blimp with sleek and sexy lines that looks more like the body of a shark than the traditional hot dog shape.
 
GeekWire
Mon, 29 Aug 2011 09:27:15 -0700

Boeing considered building a gigantic, buoyant “Hybrid Thermal Airship” that would have floated as high as 30,000 feet for up to 60 days at a time and deliver cargo anywhere in the world without the need for a runway or any other infrastructure ...
 
DatacenterDynamics
Tue, 01 Jul 2014 08:11:15 -0700

The protestors accuse the US authorities of an illegal mass surveillance program. Greenpeace flew its 135 foot thermal airship over the NSA data center in Bluffdale, Utah carrying the message, “NSA Illegal Spying Below.” A web link written on the side ...

The Guardian

CNET
Thu, 03 Apr 2014 12:28:22 -0700

One day after releasing a report grading 19 technology companies on their energy consumption, Greenpeace flew a 135-foot-long blimp -- called a "thermal airship" -- over Silicon Valley to hammer home its message from a few thousand feet above the ...
 
Billings Gazette
Fri, 25 Jul 2014 09:48:47 -0700

Five balloons launched from Centennial Park for the Magic City Hot Air Balloon Rally. One of the aircraft is a thermal airship flown by a pilot for Greenpeace with anti coal messages on the sides. Airship launches from Billings West End ...

Daily Mail

Daily Mail
Fri, 15 Aug 2014 03:20:52 -0700

A time-lapse video recording melting glaciers in Montana received an unexpected endorsement from one of the park's residents - when a furry marmot photobombed the camera. Greenpeace environmentalists left a GoPro camera in Glacier National Park in ...
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