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de Havilland DH.114 Heron
par Joss Ven 14 Mai 2010, 13:00
Je lis le main article sur Wikipedia sur le DH 114
Link :
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The [Vous devez être inscrit et connecté pour voir ce lien] DH.114 Heron was a small, [Vous devez être inscrit et connecté pour voir ce lien]-driven British [Vous devez être inscrit et connecté pour voir ce lien] that first flew on 10 May 1950.
It was a development of the twin-engine [Vous devez être inscrit et connecté pour voir ce lien], with a stretched [Vous devez être inscrit et connecté pour voir ce lien] and two more [Vous devez être inscrit et connecté pour voir ce lien].
It was designed as a rugged, conventional low-wing monoplane with [Vous devez être inscrit et connecté pour voir ce lien] that could be utilised on regional and commuter routes.
Link :
[Vous devez être inscrit et connecté pour voir ce lien]
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
The [Vous devez être inscrit et connecté pour voir ce lien] DH.114 Heron was a small, [Vous devez être inscrit et connecté pour voir ce lien]-driven British [Vous devez être inscrit et connecté pour voir ce lien] that first flew on 10 May 1950.
It was a development of the twin-engine [Vous devez être inscrit et connecté pour voir ce lien], with a stretched [Vous devez être inscrit et connecté pour voir ce lien] and two more [Vous devez être inscrit et connecté pour voir ce lien].
It was designed as a rugged, conventional low-wing monoplane with [Vous devez être inscrit et connecté pour voir ce lien] that could be utilised on regional and commuter routes.
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Re: de Havilland DH.114 Heron
par Joss Ven 14 Mai 2010, 13:05
Design and development
Immediately after the [Vous devez être inscrit et connecté pour voir ce lien], the aircraft manufacturer de Havilland developed the DH.104 Dove, a small, two-engined passenger aircraft intended as a replacement for the earlier [Vous devez être inscrit et connecté pour voir ce lien], and which soon proved to be
successful.
As a further development, the company basically enlarged the Dove; the fuselage was lengthened in order to provide room for more passengers or freight, and the wingspan was increased to make room for two additional engines.
Immediately after the [Vous devez être inscrit et connecté pour voir ce lien], the aircraft manufacturer de Havilland developed the DH.104 Dove, a small, two-engined passenger aircraft intended as a replacement for the earlier [Vous devez être inscrit et connecté pour voir ce lien], and which soon proved to be
successful.
As a further development, the company basically enlarged the Dove; the fuselage was lengthened in order to provide room for more passengers or freight, and the wingspan was increased to make room for two additional engines.
Joss- CLUB
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Re: de Havilland DH.114 Heron
par Joss Ven 14 Mai 2010, 13:09
The Heron was of all-metal construction, and was laid out as a conventional design; the resulting aircraft was able to use many of the parts originally designed for the Dove, thus simplifying logistics for airlines employing both types.
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Re: de Havilland DH.114 Heron
par Joss Ven 14 Mai 2010, 13:10
The emphasis was on rugged simplicity in order to produce an economical aircraft for short to medium stage routes in isolated and remote areas which did not possess modern airports.
The Heron was designed with a fixed undercarriage and reliable ungeared, unsupercharged [Vous devez être inscrit et connecté pour voir ce lien] engines.
The Heron was designed with a fixed undercarriage and reliable ungeared, unsupercharged [Vous devez être inscrit et connecté pour voir ce lien] engines.
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Re: de Havilland DH.114 Heron
par Joss Ven 14 Mai 2010, 13:12
The Heron prototype registered to the de Havilland Aircraft Company, Hatfield, UK as [Vous devez être inscrit et connecté pour voir ce lien] undertook its first flight
with Geoffrey Pike at the controls on 10 May 1950 .
The aircraft was unpainted at the time, and after 100 hours of testing, was introduced to the public on 8 September 1950 at the [Vous devez être inscrit et connecté pour voir ce lien], still glistening in its polished metal state.
with Geoffrey Pike at the controls on 10 May 1950 .
The aircraft was unpainted at the time, and after 100 hours of testing, was introduced to the public on 8 September 1950 at the [Vous devez être inscrit et connecté pour voir ce lien], still glistening in its polished metal state.
Joss- CLUB
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Re: de Havilland DH.114 Heron
par Joss Ven 14 Mai 2010, 13:15
The prototype was then painted and "prepped" as a company demonstrator, undergoing a trial in 1951 with [Vous devez être inscrit et connecté pour voir ce lien] on their Scottish routes.
Following the successful completion of the prototype trials as a regional airliner, the Heron began series production.
Following the successful completion of the prototype trials as a regional airliner, the Heron began series production.
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Re: de Havilland DH.114 Heron
par Joss Ven 14 Mai 2010, 13:19
Operational service
The first Heron, Series 1A suffered from a number of deficiencies, as NAC soon discovered.
First of all, the aircraft was generally underpowered.
Its quite heavy engines (weighing approximately 882 lb/400 kg each), had an output of only 250 hp (190 kW) each.
The first Heron, Series 1A suffered from a number of deficiencies, as NAC soon discovered.
First of all, the aircraft was generally underpowered.
Its quite heavy engines (weighing approximately 882 lb/400 kg each), had an output of only 250 hp (190 kW) each.
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Re: de Havilland DH.114 Heron
par Joss Ven 14 Mai 2010, 13:23
By comparison, later modifications or rebuilt aircraft had as much as 50% more power (in the case of the Saunders ST-27). Unlike the Dove, the Heron came with a fixed undercarriage and no nosewheel steering, which simplified maintenance, but reduced top speed.
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Re: de Havilland DH.114 Heron
par Joss Ven 14 Mai 2010, 13:26
After 51 Series 1 aircraft had been built, production switched to the Series 2, featuring retractable landing gear, which reduced drag and fuel consumption, and increased the top speed marginally.
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Re: de Havilland DH.114 Heron
par Joss Ven 14 Mai 2010, 13:28
The 2A was the equivalent of the 1A, the basic passenger aircraft while the 1B and its successor the 2B had higher maximum takeoff weight, the 2C featured fully-feathering propellers, the Heron 2D had an even higher maximum takeoff weight, while the Heron 2E was a [Vous devez être inscrit et connecté pour voir ce lien] version.
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