Non-rigid airship
A
blimp
(
/bl?mp/
), or
non-rigid airship
, is an
airship
(dirigible)
[1]
without an internal structural framework or a keel. Unlike
semi-rigid
and
rigid airships
(e.g.
Zeppelins
), blimps rely on the pressure of the
lifting gas
(usually
helium
, rather than
hydrogen
) inside the envelope and the strength of the envelope itself to maintain their shape. Blimps are known for their use in advertising, surveillance, and as observation platforms due to their maneuverability and steady flight capabilities.
[2]
Principle
[
edit
]
Since blimps keep their shape with internal overpressure, typically the only solid parts are the passenger car (gondola) and the
tail fins
. A non-rigid airship that uses heated air instead of a light gas (such as helium) as a lifting medium is called a
hot-air airship
(sometimes there are
battens
near the bow, which assist with higher forces there from a mooring attachment or from the greater aerodynamic pressures there).
Volume changes of the lifting gas due to temperature changes or to changes of altitude are compensated for by pumping air into internal
ballonets
(air bags) to maintain the overpressure. Without sufficient overpressure, the blimp loses its ability to be steered and is slowed due to increased drag and distortion. The propeller
air stream
can be used to inflate the ballonets and so the hull. In some models, such as the
Skyship 600
, differential ballonet inflation can provide a measure of
pitch trim
control.
The engines driving the propellers are usually directly attached to the gondola, and in some models are partly steerable.
Blimps are the most commonly built airships because they are relatively easy to build and easy to transport once deflated. However, because of their unstable hull, their size is limited. A blimp with too long a hull
may kink in the middle
when the overpressure is insufficient or when maneuvered too fast (this has also happened with semi-rigid airships with weak keels). This led to the development of
semi-rigids
and
rigid airships
.
Modern blimps are launched somewhat heavier than air (overweight), in contrast to historic blimps. The missing lift is provided by lifting the nose and using engine power, or by angling the engine thrust. Some types also use steerable propellers or
ducted fans
. Operating in a state heavier than air avoids the need to dump
ballast
at lift-off and also avoids the need to lose costly helium lifting gas on landing (most of the
Zeppelins
achieved lift with very inexpensive hydrogen, which could be vented without concern to decrease altitude).
Etymology
[
edit
]
The origin of the word "blimp" has been the subject of some confusion. Lennart Ege notes two possible derivations:
[3]
Colloquially non-rigid airships always were referred to as "Blimps". Over the years several explanations have been advanced about the origin of this word. The most common is that in the military vernacular the Type B was referred to as "limp bag", which was simply abbreviated to "blimp". An alternative explanation is that on 5 December 1915, Commander A. D. Cunningham,
R.N.
, of the
Capel-Le-Ferne Air Ship Station
, flicked the envelope of the airship SS.12 with his fingers during an inspection, which produced a sound that he mimicked and pronounced as "blimp"; and that the word then caught on as the nickname for all small non-rigid airships.
[4]
The
onomatopoeic
derivation, as the sound the airship makes when one taps the envelope (
balloon
) with a finger, was recorded in the
British Aeronautical Journal
.
[5]
A 1943 etymology, published in
The New York Times
, supports a British origin during the First World War when the British were experimenting with lighter-than-air craft. The initial non-rigid aircraft was called the A-limp; and a second version called the B-limp was deemed more satisfactory.
[6]
Yet a third derivation is given by Barnes and James in
Shorts
Aircraft since 1900
:
In February 1915 the need for anti-submarine patrol airships became urgent, and the
Submarine Scout
type was quickly improvised by hanging an obsolete
B.E.2c
fuselage
from a spare
Willows
envelope; this was done by the
R.N.A.S.
at
Kingsnorth
, and on seeing the result for the first time,
Horace Short
, already noted for his very apt and original vocabulary, named it "Blimp", adding, "What else would you call it?"
Dr. A. D. Topping researched the origins of the word and concluded that the British had never had a "Type B, limp" designation, and that Cunningham's coinage appeared to be the correct explanation.
[8]
The
Oxford English Dictionary
notes its use in print in 1916: "Visited the Blimps ... this afternoon at
Capel
". In 1918, the
Illustrated London News
said that it was "an onomatopœic name invented by that genius for apposite nomenclature, the late Horace Short".
[9]
The
B-class blimps
were patrol airships operated by the
United States Navy
during and shortly after
World War I
. The Navy learned a great deal from the
DN-1
fiasco. The result was the very successful B-type airships.
Dr. Jerome Hunsaker
was asked to develop a theory of airship design. This was followed by then-
Lieutenant
John H. Towers
,
USN
, returning from Europe having inspected British designs, and the
U.S. Navy
subsequently sought bids for 16 blimps from American manufacturers. On 4 February 1917 the Secretary of the Navy directed that 16 nonrigid airships of Class B be procured. Ultimately
Goodyear
built 9 envelopes,
Goodrich
built five and
Curtiss
built the gondolas for all of those 14 ships. Connecticut Aircraft contracted with
U.S. Rubber
for its two envelopes and with
Pigeon Fraser
for its gondolas. The Curtiss-built gondolas were modified
JN-4
fuselages and were powered by
OX-5 engines
. The Connecticut Aircraft blimps were powered by
Hall-Scott engines
.
In 1930, a former German airship officer, Captain Anton Heinen, working in the US for the US Navy on its dirigible fleet, attempted to design and build a four-place blimp called the "family air yacht" for private fliers which the inventor claimed would be priced below $10,000 and easier to fly than a fixed-wing aircraft if placed in production. It was unsuccessful.
[10]
[11]
In 2021,
Reader's Digest
said that "consensus is that there are about 25 blimps still in existence and only about half of them are still in use for advertising purposes".
[12]
The Airsign Airship Group is the owner and operator of 8 of these active ships, including the Hood Blimp, DirecTV blimp, and the MetLife blimp.
[13]
Surveillance blimp
[
edit
]
This blimp is a type of
airborne early warning and control
aircraft, typically as the active part of a system which includes a mooring platform, communications and information processing. Example systems include the U.S.
JLENS
and Israeli
Aeronautics Defense Skystar 300
.
[14]
[15]
Surveillance blimps known as
aerostats
have been used extensively in the Middle East by the
United States military
, the
United Arab Emirates
and
Kuwait
.
[16]
Examples of non-rigid airships
[
edit
]
Manufacturers in many countries have built blimps in many designs.
[17]
Some examples include:
- ADB-3-X01
, the largest lightship ever manufactured by
Airship do Brasil
, the only blimp manufacturing company in
Latin America
- AVIC AS700 Airship
- British Army airship Beta
- Coastal class airship
,
C* class airship
UK coastal blimps used in WW I
- SS
,
SSP
,
SST
,
SSZ
and
NS class airships
, convoy escort blimps used by the UK in
World War I
- G class blimp
and
L class blimp
, US training blimps built by Goodyear during
World War II
- K class blimp
and
M class blimp
, US anti-submarine blimps operated during World War II
- Mantainer
Ardath
, an Australian blimp, in use during the mid-1970s
- N class blimp
(the "Nan ship"), used for anti-submarine and as a radar early-warning platform during the 1950s
- Goodyear Blimps
, a fleet of blimps operated for advertising purposes and as a
television camera
platform
- Skyship 600
, a private blimp used by advertising companies
- P-791
, an experimental aerostatic/aerodynamic
hybrid airship
developed by
Lockheed-Martin
corporation
- SVAM CA-80
, an airship manufactured by the Shanghai Vantage Airship Manufacture Co in
China
- TC-3
and TC-7, two US Army Corps non-rigid blimps used for
parasite fighter
trials during 1923?24
- WDL 2
, airship for aerial advertising manufactured and used by WDL Group, Germany
- Willows airships
See also
[
edit
]
Notes
[
edit
]
- ^
"blimp"
.
Lexico
. Oxford University Press. Archived from
the original
on 29 July 2020
. Retrieved
24 November
2020
.
- ^
Smith, Jessica (9 January 2024).
"Difference Between Blimp Or Zeppelin?"
. Retrieved
5 February
2024
.
- ^
Ege, Lennart (1973).
Balloons and Airships, and Dirigibles 1783?1973
. Translated by Munson, Kenneth. London: Blandford.
ISBN
978-0-7137-0568-3
.
- ^
Meager, George (1970).
My Airship Flights 1915?1930
. London: William Kimber and Co. p. 32.
ISBN
978-0-7183-0331-0
.
- ^
Goddard, Victor (1968). "Per Ardua?Peradventure: A Contemporary Review of Innovations during the First Fifty Years of the Royal Air Force".
The Aeronautical Journal
.
72
(694).
Royal Aeronautical Society
: 857.
doi
:
10.1017/S0001924000085237
.
ISSN
0001-9240
.
S2CID
115595814
.
- ^
"Origin of 'Blimp' Explained".
The New York Times
. 3 January 1943.
- ^
van Beverhoudt, Arnold E. (2013).
These Are the Voyages: A History of the Ships, Aircraft, and Spacecraft Named
Enterprise
. Lulu.com. p. 119.
ISBN
978-0-557-17825-4
.
- ^
"blimp"
.
Oxford English Dictionary
(2nd ed.). Oxford University Press. 1989.
- ^
"Aeronautics: Air Yacht"
.
Time
. Vol. 16, no. 18. 3 November 1930.
- ^
"Dirigible Air Yacht Has Automobile Cabin"
.
Popular Mechanics
. Vol. 54, no. 6. December 1930. p. 967.
- ^
Cutolo, Morgan (3 April 2021).
"Here's Why You Don't See Blimps Anymore"
.
- ^
Broughton, David (23 June 2014).
"Flying high: How sponsors, networks and fans make the business of blimps soar"
.
Sports Business Journal
. Retrieved
1 November
2015
.
- ^
"Military blimp escapes, causes power outages before landing in Pennsylvania"
.
Stars and Stripes
. Retrieved
30 October
2015
.
- ^
"Military Blimp Gets Loose, Cuts Power Lines"
.
AVweb
. 28 October 2015
. Retrieved
30 October
2015
.
- ^
Pocock, Chris (12 November 2011).
"Aerostats Rise Through the Ranks in Surveillance Service"
.
ainonline.com
. Retrieved
20 May
2022
.
- ^
"FAQs ? Business of blimps"
.
Goodyear Tire and Rubber Company
. Archived from
the original
on 2 March 2010
. Retrieved
13 December
2009
.
- ^
"The MetLife Blimp"
.
MetLife
. 2009. Archived from
the original
on 19 December 2009
. Retrieved
13 December
2009
.
References
[
edit
]
- Barnes, C. H.; James, D. N. (1989).
Shorts Aircraft since 1900
. London: Putnam.
ISBN
0-85177-819-4
.
External links
[
edit
]
Wikimedia Commons has media related to
Blimps
.