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aeronewsline :: Accueil :: Histoire :: Aéronefs 1945 à 1955
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Re: Douglas X3
par Ned_T Lun 26 Juil 2010, 21:21
With the completion of the contractor test program in December 1953, the X-3 was delivered to the [Vous devez être inscrit et connecté pour voir ce lien].
The poor performance of the X-3 meant only an abbreviated program would be made, to gain experience with low-aspect ratio wings. [Vous devez être inscrit et connecté pour voir ce lien] and [Vous devez être inscrit et connecté pour voir ce lien] each made three flights.
Although flown by Air Force pilots, these were counted as [Vous devez être inscrit et connecté pour voir ce lien] flights.
With the last flight by Yeager in July 1954, NACA made plans for a limited series of research flights with the X-3.
The initial flights looked at longitudinal stability and control, wing and tail loads, and pressure distribution.
The poor performance of the X-3 meant only an abbreviated program would be made, to gain experience with low-aspect ratio wings. [Vous devez être inscrit et connecté pour voir ce lien] and [Vous devez être inscrit et connecté pour voir ce lien] each made three flights.
Although flown by Air Force pilots, these were counted as [Vous devez être inscrit et connecté pour voir ce lien] flights.
With the last flight by Yeager in July 1954, NACA made plans for a limited series of research flights with the X-3.
The initial flights looked at longitudinal stability and control, wing and tail loads, and pressure distribution.
Ned_T- CLUB
- Messages : 2417
Re: Douglas X3
par Ned_T Lun 26 Juil 2010, 21:23
NACA pilot [Vous devez être inscrit et connecté pour voir ce lien] made his pilot checkout flight in the X-3 on 23 August 1954, then conducted eight research flights in September and October.
By late October, the research program was expanded to include lateral and directional stability tests. In these tests, the X-3 was abruptly rolled at [Vous devez être inscrit et connecté pour voir ce lien] and supersonic speeds, with the rudder kept centered.
Despite its shortcomings, the X-3 was ideal for these tests.
The mass of its engines, fuel and structure was concentrated in its long, narrow fuselage, while its wings were short and stubby. As a result, the X-3 was "loaded" along its fuselage, rather than its wings.
This was typical of the fighter aircraft then in development or testing.
By late October, the research program was expanded to include lateral and directional stability tests. In these tests, the X-3 was abruptly rolled at [Vous devez être inscrit et connecté pour voir ce lien] and supersonic speeds, with the rudder kept centered.
Despite its shortcomings, the X-3 was ideal for these tests.
The mass of its engines, fuel and structure was concentrated in its long, narrow fuselage, while its wings were short and stubby. As a result, the X-3 was "loaded" along its fuselage, rather than its wings.
This was typical of the fighter aircraft then in development or testing.
Ned_T- CLUB
- Messages : 2417
Re: Douglas X3
par Ned_T Lun 26 Juil 2010, 21:35
The post-flight examination showed the fuselage had been subjected to its maximum load limit. Had the acceleration been higher, the aircraft could have broken up. Walker and the X-3 had experienced "[Vous devez être inscrit et connecté pour voir ce lien]," in which a maneuver in one axis will cause an uncommanded maneuver in one or two others.
At the same time, several [Vous devez être inscrit et connecté pour voir ce lien] were involved in similar incidents.
A research program was started by NACA to understand the problem and find solutions.
At the same time, several [Vous devez être inscrit et connecté pour voir ce lien] were involved in similar incidents.
A research program was started by NACA to understand the problem and find solutions.
Ned_T- CLUB
- Messages : 2417
Re: Douglas X3
par Ned_T Lun 26 Juil 2010, 21:37
For the X-3, the roll coupling flight was the high point of its history.
The aircraft was grounded for nearly a year after the flight, and never again explored its roll stability and control boundaries.
Walker made another 10 flights between 20 September 1955 and the last on 23 May 1956.
The aircraft was grounded for nearly a year after the flight, and never again explored its roll stability and control boundaries.
Walker made another 10 flights between 20 September 1955 and the last on 23 May 1956.
Ned_T- CLUB
- Messages : 2417
Re: Douglas X3
par Ned_T Lun 26 Juil 2010, 21:39
The aircraft was subsequently retired to the [Vous devez être inscrit et connecté pour voir ce lien].
Although the X-3 never met its intention of providing aerodynamic data in Mach 2 cruise, its short service was of value.
It showed the dangers of roll [Vous devez être inscrit et connecté pour voir ce lien], and provided early flight test data on the phenomena.
Although the X-3 never met its intention of providing aerodynamic data in Mach 2 cruise, its short service was of value.
It showed the dangers of roll [Vous devez être inscrit et connecté pour voir ce lien], and provided early flight test data on the phenomena.
Ned_T- CLUB
- Messages : 2417
Re: Douglas X3
par Ned_T Lun 26 Juil 2010, 21:41
Production
Two aircraft were ordered, but only one was built. It made 51 flights.
Two aircraft were ordered, but only one was built. It made 51 flights.
Ned_T- CLUB
- Messages : 2417
Re: Douglas X3
par Ned_T Lun 26 Juil 2010, 21:42
Survivors
- The sole X-3 was transferred in 1956 to the [Vous devez être inscrit et connecté pour voir ce lien] at [Vous devez être inscrit et connecté pour voir ce lien], Ohio.[Vous devez être inscrit et connecté pour voir ce lien] As of 2008 it is on display in the Museum's Research & Development Gallery.[Vous devez être inscrit et connecté pour voir ce lien]
Ned_T- CLUB
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Re: Douglas X3
par Ned_T Lun 26 Juil 2010, 21:43
Specifications (X-3)
General characteristics
General characteristics
- Crew: 1
- Length: 66 ft 9 in (20.3 m)
- [Vous devez être inscrit et connecté pour voir ce lien]: 22 ft 8 in (6.9 m)
- Height: 12 ft 6 in (3.8 m)
- Wing area: 166.5 ft² (15.47 m²)
- Empty weight: 16,120 lb (7,310 kg)
- [Vous devez être inscrit et connecté pour voir ce lien]: 23,840 lb (10,810 kg)
- Powerplant: 2× [Vous devez être inscrit et connecté pour voir ce lien] afterburning turbojet, 3,370 lbf, 4,850 lbf with afterburning (15.0 kN, 21.6 kN with afterburning) each
Ned_T- CLUB
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