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aeronewsline :: Accueil :: Histoire :: Aéronefs 1956 à 1965
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Re: Fairey Rotodyne
par Forest Lun 09 Aoû 2010, 15:37
Throughout the world, interest was growing in the prospect of direct city-to-city transport.
The market for the Rotodyne was that of a medium-haul "flying bus": it would take off vertically from an
inner-city [Vous devez être inscrit et connecté pour voir ce lien], with all [Vous devez être inscrit et connecté pour voir ce lien] coming from the tip-jet driven rotor, and then would increase airspeed, eventually with all power from the engines being transferred to the [Vous devez être inscrit et connecté pour voir ce lien] with the rotor [Vous devez être inscrit et connecté pour voir ce lien].
In this mode, the [Vous devez être inscrit et connecté pour voir ce lien], and hence [Vous devez être inscrit et connecté pour voir ce lien], of the rotor could be reduced, as the wings would be taking as much as half of the craft's weight.
The market for the Rotodyne was that of a medium-haul "flying bus": it would take off vertically from an
inner-city [Vous devez être inscrit et connecté pour voir ce lien], with all [Vous devez être inscrit et connecté pour voir ce lien] coming from the tip-jet driven rotor, and then would increase airspeed, eventually with all power from the engines being transferred to the [Vous devez être inscrit et connecté pour voir ce lien] with the rotor [Vous devez être inscrit et connecté pour voir ce lien].
In this mode, the [Vous devez être inscrit et connecté pour voir ce lien], and hence [Vous devez être inscrit et connecté pour voir ce lien], of the rotor could be reduced, as the wings would be taking as much as half of the craft's weight.
Forest- CLUB
- Messages : 334
Re: Fairey Rotodyne
par Forest Lun 09 Aoû 2010, 15:39
The Rotodyne would then cruise at speeds of about 150 [Vous devez être inscrit et connecté pour voir ce lien] (280 km) to another city (e.g. London to Paris) where the rotor tip-jet system would be restarted for landing vertically in the city centre.
When the Rotodyne landed and the rotor stopped moving, its blades drooped downward from the hub.
To avoid striking the [Vous devez être inscrit et connecté pour voir ce lien] on start-up, the tips of these fins were angled down to the horizontal.
They were raised once the rotor had spun up.
When the Rotodyne landed and the rotor stopped moving, its blades drooped downward from the hub.
To avoid striking the [Vous devez être inscrit et connecté pour voir ce lien] on start-up, the tips of these fins were angled down to the horizontal.
They were raised once the rotor had spun up.
Forest- CLUB
- Messages : 334
Re: Fairey Rotodyne
par Forest Lun 09 Aoû 2010, 15:41
[Vous devez être inscrit et connecté pour voir ce lien] announced that it was interested in the purchase of six aircraft, with a possibility of up to 20.
The [Vous devez être inscrit et connecté pour voir ce lien] ordered 12 military transport versions. [Vous devez être inscrit et connecté pour voir ce lien] signed a letter of intent for the purchase of five with an option on more albeit with qualifications.
The [Vous devez être inscrit et connecté pour voir ce lien] ordered 12 military transport versions. [Vous devez être inscrit et connecté pour voir ce lien] signed a letter of intent for the purchase of five with an option on more albeit with qualifications.
Forest- CLUB
- Messages : 334
Re: Fairey Rotodyne
par Forest Lun 09 Aoû 2010, 15:42
The [Vous devez être inscrit et connecté pour voir ce lien] was interested in buying 200 of the Type Y Rotodyne to be manufactured by Fairey's US licensee, Kaman Helicopters in Bloomfield, CT. Government funding was secured again on the proviso that firm orders would be gained from BEA.
The civilian orders were dependent on the noise issues being satisfactorily met.
The civilian orders were dependent on the noise issues being satisfactorily met.
Forest- CLUB
- Messages : 334
Re: Fairey Rotodyne
par Forest Lun 09 Aoû 2010, 15:43
Cancellation
In 1959, the British Government, seeking to cut costs, decreed that the number of aircraft firms be lowered and set forth their expectations for mergers in airframe and aero-engine companies.
By delaying or withholding access to defence contracts the British firms could be forced into mergers. [Vous devez être inscrit et connecté pour voir ce lien], then the helicopter division of [Vous devez être inscrit et connecté pour voir ce lien], and Saunders-Roe were incorporated with [Vous devez être inscrit et connecté pour voir ce lien].
In 1959, the British Government, seeking to cut costs, decreed that the number of aircraft firms be lowered and set forth their expectations for mergers in airframe and aero-engine companies.
By delaying or withholding access to defence contracts the British firms could be forced into mergers. [Vous devez être inscrit et connecté pour voir ce lien], then the helicopter division of [Vous devez être inscrit et connecté pour voir ce lien], and Saunders-Roe were incorporated with [Vous devez être inscrit et connecté pour voir ce lien].
Forest- CLUB
- Messages : 334
Re: Fairey Rotodyne
par Forest Lun 09 Aoû 2010, 15:46
The larger Rotodyne design could be developed to take 57 to 75 passengers which with the [Vous devez être inscrit et connecté pour voir ce lien] turboprops (5,250 shp/3,910 kW) would have a cruising speed of 200 kn (370 km/h).
It would be able to carry nearly 8 tons (7 tonnes) of freight and [Vous devez être inscrit et connecté pour voir ce lien] vehicles would fit into its fuselage.
It would be able to carry nearly 8 tons (7 tonnes) of freight and [Vous devez être inscrit et connecté pour voir ce lien] vehicles would fit into its fuselage.
Forest- CLUB
- Messages : 334
Re: Fairey Rotodyne
par Forest Lun 09 Aoû 2010, 15:48
Government funding of some £5 million was promised.
The expected order from the RAF did not appear - they had no particular interest in the design with the issue of nuclear deterrence to the fore at the time.
The Tyne engines were starting to appear underpowered for the larger design.
Rolls-Royce were told that they would have to fund the engine development themselves.
The expected order from the RAF did not appear - they had no particular interest in the design with the issue of nuclear deterrence to the fore at the time.
The Tyne engines were starting to appear underpowered for the larger design.
Rolls-Royce were told that they would have to fund the engine development themselves.
Forest- CLUB
- Messages : 334
Re: Fairey Rotodyne
par Forest Lun 09 Aoû 2010, 15:54
However, the end came when the interest shown by BEA did not provide an order and a request for an order by the military was turned down.
The funding for the Rotodyne was cut in early 1962.
The funding for the Rotodyne was cut in early 1962.
Forest- CLUB
- Messages : 334
Re: Fairey Rotodyne
par Forest Lun 09 Aoû 2010, 15:56
The corporate management at Westland decided that further Rotodyne development towards production status was not worth the investment required.
After the program was terminated, the Rotodyne, which was, after all, government property, was dismantled and largely destroyed in the same way as the [Vous devez être inscrit et connecté pour voir ce lien].
After the program was terminated, the Rotodyne, which was, after all, government property, was dismantled and largely destroyed in the same way as the [Vous devez être inscrit et connecté pour voir ce lien].
Forest- CLUB
- Messages : 334
Re: Fairey Rotodyne
par Forest Lun 09 Aoû 2010, 15:57
Analysis
The one great criticism of the Rotodyne was the noise the tip jets made, however, the jets were only run at full power for a matter of minutes during departure and landing and indeed, the test pilot Ron Gelattly made two flights over central London, and several landings and departures at [Vous devez être inscrit et connecté pour voir ce lien] with no complaints being registered.
There was also a noise-reduction program in process which had managed to get the noise level down to the desired level of 96 dB from 600 ft (180 m) away, less than the noise made by a [Vous devez être inscrit et connecté pour voir ce lien] train, and at the time of cancellation, silencers were in the pipeline which would have reduced the noise even further.
In the end though it was funding and not noise that killed the Rotodyne.
The one great criticism of the Rotodyne was the noise the tip jets made, however, the jets were only run at full power for a matter of minutes during departure and landing and indeed, the test pilot Ron Gelattly made two flights over central London, and several landings and departures at [Vous devez être inscrit et connecté pour voir ce lien] with no complaints being registered.
There was also a noise-reduction program in process which had managed to get the noise level down to the desired level of 96 dB from 600 ft (180 m) away, less than the noise made by a [Vous devez être inscrit et connecté pour voir ce lien] train, and at the time of cancellation, silencers were in the pipeline which would have reduced the noise even further.
In the end though it was funding and not noise that killed the Rotodyne.
Forest- CLUB
- Messages : 334
Re: Fairey Rotodyne
par Forest Lun 09 Aoû 2010, 15:59
It is only relatively recently that interest has been re-established in direct city-to-city transport, with aircraft such as the Bell/Augusta [Vous devez être inscrit et connecté pour voir ce lien] and the [Vous devez être inscrit et connecté pour voir ce lien].
Groen Brothers Aviation are developing techniques for converting proven aeroplane designs into gyrodynes.
Groen Brothers Aviation are developing techniques for converting proven aeroplane designs into gyrodynes.
Forest- CLUB
- Messages : 334
Re: Fairey Rotodyne
par Forest Lun 09 Aoû 2010, 16:01
Specifications (Rotodyne "Y")
General characteristics
General characteristics
- Crew: 2
- Capacity: 48 passengers
- Length: 58 ft 8 in (17.9 m)
- Rotor diameter: 90 ft 0 in (27.4 m)
- Height: 22 ft 2 in (6.76 m)
- Disc area: 6,360 ft² (591 m²)
- Loaded weight: 33,000 lb (15,000 kg)
- [Vous devez être inscrit et connecté pour voir ce lien]: 38,000 lb (17,000 kg)
- Powerplant:
- 4× rotor tip jet burning compressed air/fuel, 4453 N[Vous devez être inscrit et connecté pour voir ce lien] each
- 2× [Vous devez être inscrit et connecté pour voir ce lien], 2,800 hp (2,100 kW) each
Forest- CLUB
- Messages : 334
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