Hiller X-18
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Hiller X-18
Dans la série aile basculante, le Hiller X-18. Sur Wikipedia; en anglais :
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The X-18 was an experimental cargo transport aircraft designed to be the first testbed for tiltwing and [Vous devez être inscrit et connecté pour voir ce lien] (vertical/short takeoff and landing) technology.
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The X-18 was an experimental cargo transport aircraft designed to be the first testbed for tiltwing and [Vous devez être inscrit et connecté pour voir ce lien] (vertical/short takeoff and landing) technology.
Koro- CLUB
- Messages : 1175
Localisation : IDF
Re: Hiller X-18
Development
Design work started in [Vous devez être inscrit et connecté pour voir ce lien] by [Vous devez être inscrit et connecté pour voir ce lien] and [Vous devez être inscrit et connecté pour voir ce lien] received a manufacturing contract and funding from the [Vous devez être inscrit et connecté pour voir ce lien] to build the only X-18 ever produced.
Design work started in [Vous devez être inscrit et connecté pour voir ce lien] by [Vous devez être inscrit et connecté pour voir ce lien] and [Vous devez être inscrit et connecté pour voir ce lien] received a manufacturing contract and funding from the [Vous devez être inscrit et connecté pour voir ce lien] to build the only X-18 ever produced.
Koro- CLUB
- Messages : 1175
Localisation : IDF
Re: Hiller X-18
To speed up construction and conserve money the plane was constructed from scavenged parts including a Chase [Vous devez être inscrit et connecté pour voir ce lien] fuselage and the [Vous devez être inscrit et connecté pour voir ce lien] came from the [Vous devez être inscrit et connecté pour voir ce lien] and [Vous devez être inscrit et connecté pour voir ce lien] experimental airplanes program.
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- Messages : 1175
Localisation : IDF
Re: Hiller X-18
Service history
The first test flight was on November 24, 1959, ultimately recording 20 flights out of [Vous devez être inscrit et connecté pour voir ce lien].
A number of problems plagued the X-18 including being susceptible to wind gusts when the wing rotated, acting like a sail.
In addition the turboprop engines were not cross-linked, so the failure of one engine meant the airplane would crash.
Thrust control was through throttle changes, which were too slow for acceptable height and roll control.
The first test flight was on November 24, 1959, ultimately recording 20 flights out of [Vous devez être inscrit et connecté pour voir ce lien].
A number of problems plagued the X-18 including being susceptible to wind gusts when the wing rotated, acting like a sail.
In addition the turboprop engines were not cross-linked, so the failure of one engine meant the airplane would crash.
Thrust control was through throttle changes, which were too slow for acceptable height and roll control.
Koro- CLUB
- Messages : 1175
Localisation : IDF
Re: Hiller X-18
However ground testing of the tiltwing concepts continued.
Eventually a VTOL Test Stand was built on which the X-18's vertical takeoff and landing and hover control was to be tested.
Eventually a VTOL Test Stand was built on which the X-18's vertical takeoff and landing and hover control was to be tested.
Koro- CLUB
- Messages : 1175
Localisation : IDF
Re: Hiller X-18
One engine run was successfully conducted to the full 15-foot wheel height on the VTOL Test Stand.
The program was cancelled on January 18, 1964 before further VTOL Test Stand testing could be conducted, and the
X-18 was cut up for scrap.
The program was cancelled on January 18, 1964 before further VTOL Test Stand testing could be conducted, and the
X-18 was cut up for scrap.
Koro- CLUB
- Messages : 1175
Localisation : IDF
Re: Hiller X-18
The program proved several things that contributed to further tilt-wing VSTOL technology programs:
(1) cross-shafting between the engines was mandatory in order to avoid loss of control in the event of an engine failure; and (2) direct propeller pitch control was mandatory for precise height and lateral control during VTOL and hover.
(1) cross-shafting between the engines was mandatory in order to avoid loss of control in the event of an engine failure; and (2) direct propeller pitch control was mandatory for precise height and lateral control during VTOL and hover.
Koro- CLUB
- Messages : 1175
Localisation : IDF
Re: Hiller X-18
This knowledge was employed in the successful development and flight tests of the Tri-Service Hiller-Vought-Ryan XC-142A, tilt-wing VSTOL transport.
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Re: Hiller X-18
Specifications (X-18)
General characteristics
General characteristics
- Crew: 2-3
- Length: 63 ft 0 in (19.2 m)
- [Vous devez être inscrit et connecté pour voir ce lien]: 48 ft 0 in (14.6 m)
- Height: 24 ft 7 in (7.5 m)
- Empty weight: 26,786 [Vous devez être inscrit et connecté pour voir ce lien] (12,150 kg)
- [Vous devez être inscrit et connecté pour voir ce lien]: 33,000 lb (14,850 kg)
- Powerplant:
- 1× [Vous devez être inscrit et connecté pour voir ce lien] turbojet engine for pitch control, 3,400 [Vous devez être inscrit et connecté pour voir ce lien] (15.2 kN)
- 2× [Vous devez être inscrit et connecté pour voir ce lien]-A-14 turboprop engines, 5,500 [Vous devez être inscrit et connecté pour voir ce lien] (4,100 kW) each
Koro- CLUB
- Messages : 1175
Localisation : IDF
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