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aeronewsline :: Accueil :: Histoire :: Aéronefs 1956 à 1965
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Re: Douglas DC-8
par Ugant Mer 17 Nov 2010, 14:45
Further developments
In April 1965, Douglas announced belated fuselage stretches for the DC-8, with not just one but three new models, known as the Super Sixties.
The DC-8 program had been in danger of closing with fewer than 300 aircraft sold, but the Super Sixties brought fresh life to it.
By the time production ceased in 1972, 262 of the stretched DC-8s had been made.
With the ability to seat 269 passengers, the DC-8 Series 61 and 63 easily comprised the largest airliner available, and remained so until the [Vous devez être inscrit et connecté pour voir ce lien] arrived in 1970.
In April 1965, Douglas announced belated fuselage stretches for the DC-8, with not just one but three new models, known as the Super Sixties.
The DC-8 program had been in danger of closing with fewer than 300 aircraft sold, but the Super Sixties brought fresh life to it.
By the time production ceased in 1972, 262 of the stretched DC-8s had been made.
With the ability to seat 269 passengers, the DC-8 Series 61 and 63 easily comprised the largest airliner available, and remained so until the [Vous devez être inscrit et connecté pour voir ce lien] arrived in 1970.
Ugant- CLUB
- Messages : 3213
Re: Douglas DC-8
par Ugant Mer 17 Nov 2010, 14:48
All the earlier jetliners were noisy by modern standards. Increasing traffic densities and changing public attitudes led to complaints about aircraft noise and moves to introduce restrictions.
As early as 1966 the [Vous devez être inscrit et connecté pour voir ce lien] expressed concern about the noise to be expected from the then still unbuilt DC-8-61, and operators had to agree to operate it from New York at lower weights to reduce noise.
By the early 1970s, legislation for aircraft noise standards was being introduced in many countries, and the 60 Series DC-8s were particularly at risk of being banned from major airports.
As early as 1966 the [Vous devez être inscrit et connecté pour voir ce lien] expressed concern about the noise to be expected from the then still unbuilt DC-8-61, and operators had to agree to operate it from New York at lower weights to reduce noise.
By the early 1970s, legislation for aircraft noise standards was being introduced in many countries, and the 60 Series DC-8s were particularly at risk of being banned from major airports.
Ugant- CLUB
- Messages : 3213
Re: Douglas DC-8
par Ugant Mer 17 Nov 2010, 14:51
In the early 1970s several airlines approached McDonnell Douglas for noise reduction modifications to the DC-8 but nothing was done.
Third parties had developed aftermarket [Vous devez être inscrit et connecté pour voir ce lien] but there was no real move to keep the DC-8 in service.
Finally, in 1975, [Vous devez être inscrit et connecté pour voir ce lien] began discussions with major airlines with a view to fitting the new and vastly quieter Franco-American [Vous devez être inscrit et connecté pour voir ce lien] engine to both DC-8s and 707s.
MDC remained reluctant but eventually came on board in the late 1970s and helped develop the 70 Series DC-8s.
Third parties had developed aftermarket [Vous devez être inscrit et connecté pour voir ce lien] but there was no real move to keep the DC-8 in service.
Finally, in 1975, [Vous devez être inscrit et connecté pour voir ce lien] began discussions with major airlines with a view to fitting the new and vastly quieter Franco-American [Vous devez être inscrit et connecté pour voir ce lien] engine to both DC-8s and 707s.
MDC remained reluctant but eventually came on board in the late 1970s and helped develop the 70 Series DC-8s.
Ugant- CLUB
- Messages : 3213
Re: Douglas DC-8
par Ugant Mer 17 Nov 2010, 14:55
The Super Seventies were a great success: roughly 70% quieter than the 60-Series and, at the time of their introduction, the world's quietest four-engined airliner.
As well as being quieter and more powerful, the CFM56 was roughly 20% more fuel efficient than the JT3D, which reduced operating costs and extended the range.
As well as being quieter and more powerful, the CFM56 was roughly 20% more fuel efficient than the JT3D, which reduced operating costs and extended the range.
Ugant- CLUB
- Messages : 3213
Re: Douglas DC-8
par Ugant Mer 17 Nov 2010, 14:57
By 2002, of the 1032 707s and [Vous devez être inscrit et connecté pour voir ce lien] manufactured for commercial use, just 80 remained in service — though many of those 707s were converted for [Vous devez être inscrit et connecté pour voir ce lien] use, either in service or for spare parts.
Of the 556 DC-8s made, around 200 were still in commercial service in 2002, including about 25 50-Series, 82 of the stretched 60-Series, and 96 out of the 110 re-engined 70-Series.
Of the 556 DC-8s made, around 200 were still in commercial service in 2002, including about 25 50-Series, 82 of the stretched 60-Series, and 96 out of the 110 re-engined 70-Series.
Ugant- CLUB
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Re: Douglas DC-8
par Ugant Jeu 18 Nov 2010, 09:01
DC-8 Series 20 Higher-powered 15,916 lbf (70.8 kN) [Vous devez être inscrit et connecté pour voir ce lien]-3 turbojets allowed a weight increase to 138 tons (125 tonnes).
34 DC-8-20s were manufactured.
This model was originally named "DC-8B" but was renamed when the series 30 was introduced.[Vous devez être inscrit et connecté pour voir ce lien]
34 DC-8-20s were manufactured.
This model was originally named "DC-8B" but was renamed when the series 30 was introduced.[Vous devez être inscrit et connecté pour voir ce lien]
Ugant- CLUB
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Re: Douglas DC-8
par Ugant Jeu 18 Nov 2010, 09:19
DC-8 Series 30 For intercontinental routes, the three Series 30 variants combined JT4A engines with a one-third increase in fuel capacity and strengthened fuselage and landing gear.
The DC-8-31 was certified in March 1960 with 16,906 lbf (75.2 kN) JT4A-9 engines for 150 tons (136 tonnes) maximum weight.
The DC-8-31 was certified in March 1960 with 16,906 lbf (75.2 kN) JT4A-9 engines for 150 tons (136 tonnes) maximum weight.
Ugant- CLUB
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Re: Douglas DC-8
par Ugant Jeu 18 Nov 2010, 09:21
The DC-8-32 was similar but allowed 154 tons (140 tonnes) weight.
Ugant- CLUB
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