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Boulton Paul Balliol
par Belissar Dim 03 Oct 2010, 15:50
Le Boulton Paul Balliol raconté par un rédacteur de Wikipedia de langue anglaise :
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The Boulton Paul Balliol and the related Sea Balliol were monoplane military advanced trainer aircraft built for the United Kingdom's Royal Air Force (RAF) and the Royal Navy Fleet Air Arm (FAA) by Boulton Paul Aircraft.
Developed in the late 1940s the Balliol was designed to replace the North American Harvard trainer and used the Rolls-Royce Merlin engine, with the Sea Balliol a naval version for deck landing training.
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The Boulton Paul Balliol and the related Sea Balliol were monoplane military advanced trainer aircraft built for the United Kingdom's Royal Air Force (RAF) and the Royal Navy Fleet Air Arm (FAA) by Boulton Paul Aircraft.
Developed in the late 1940s the Balliol was designed to replace the North American Harvard trainer and used the Rolls-Royce Merlin engine, with the Sea Balliol a naval version for deck landing training.
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Re: Boulton Paul Balliol
par Belissar Dim 03 Oct 2010, 15:51
Design and development
The Balliol was developed to meet Air Ministry Specification T.7/45 for a three-seat advanced trainer powered by a turboprop engine, competing against the Avro Athena.
It was a conventional low wing monoplane with a retractable main undercarriage and a fixed tailwheel. Pilot and instructor sat side-by-side ahead of the observer.
The first prototype first flew on 30 May 1947, being temporarily powered by an 820 hp (611 kW) Bristol Mercury 30 radial engine.
The Balliol was developed to meet Air Ministry Specification T.7/45 for a three-seat advanced trainer powered by a turboprop engine, competing against the Avro Athena.
It was a conventional low wing monoplane with a retractable main undercarriage and a fixed tailwheel. Pilot and instructor sat side-by-side ahead of the observer.
The first prototype first flew on 30 May 1947, being temporarily powered by an 820 hp (611 kW) Bristol Mercury 30 radial engine.
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- Messages : 388
Re: Boulton Paul Balliol
par Belissar Dim 03 Oct 2010, 15:53
The second prototype, powered by the intended Armstrong Siddeley Mamba turboprop, first flew on 17 May 1948, the world's first single-engined turboprop aircraft to fly.
The Air Ministry had second thoughts about its training requirements, and issued a new specification, T.14/47, requiring a two seat trainer, powered by a Rolls-Royce Merlin piston engine.
The Air Ministry had second thoughts about its training requirements, and issued a new specification, T.14/47, requiring a two seat trainer, powered by a Rolls-Royce Merlin piston engine.
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- Messages : 388
Re: Boulton Paul Balliol
par Belissar Dim 03 Oct 2010, 15:56
The Merlin powered Balliol, designated Balliol T.2, first flew on 10 July 1948, and after extensive evaluation, it was chosen over the Athena, with large orders being placed to replace some of the Harvards in RAF service.
The observer's seat of the Mk 1 was removed, the side-by-side seats remaining.
The Sea Balliol T.21 had folding wings and arrestor hook for deck landings.
The observer's seat of the Mk 1 was removed, the side-by-side seats remaining.
The Sea Balliol T.21 had folding wings and arrestor hook for deck landings.
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Re: Boulton Paul Balliol
par Belissar Dim 03 Oct 2010, 15:57
By 1951, however, the Air Ministry changed its mind about its training requirements yet again and decided to introduce a jet-powered advanced trainer, the de Havilland Vampire T.Mk11.
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Re: Boulton Paul Balliol
par Belissar Dim 03 Oct 2010, 15:59
Operational history
Pre-production Balliols were delivered to the RAF's Central Flying School in 1950, but with the change in air-training policy, the Balliol was only delivered to one Flying Training School, - No. 7 at RAF Cottesmore, replacing their Harvards.
The Balliol later served at the RAF College, Cranwell until replaced there by the de Havilland Vampire T.Mk 11 in 1956.
The Balliol also saw limited squadron service from 1953 with No. 288 Squadron RAF based at RAF Middle Wallop.
Operations continued until the squadron was disbanded in September 1957.
Pre-production Balliols were delivered to the RAF's Central Flying School in 1950, but with the change in air-training policy, the Balliol was only delivered to one Flying Training School, - No. 7 at RAF Cottesmore, replacing their Harvards.
The Balliol later served at the RAF College, Cranwell until replaced there by the de Havilland Vampire T.Mk 11 in 1956.
The Balliol also saw limited squadron service from 1953 with No. 288 Squadron RAF based at RAF Middle Wallop.
Operations continued until the squadron was disbanded in September 1957.
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Re: Boulton Paul Balliol
par Belissar Dim 03 Oct 2010, 16:00
The Sea Balliols served with 781 squadron at Lee-on-Solent and 1843 RNVR at Abbotsinch.
The last one was delivered in December 1954.[3] Some remained active at Abbotsinch until September 1963.
Two Balliols were used for the testing of radar absorbing coatings.
The only Balliols exported were 12 Mk.2s to the Royal Ceylon Airforce.
The last one was delivered in December 1954.[3] Some remained active at Abbotsinch until September 1963.
Two Balliols were used for the testing of radar absorbing coatings.
The only Balliols exported were 12 Mk.2s to the Royal Ceylon Airforce.
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Re: Boulton Paul Balliol
par Belissar Dim 03 Oct 2010, 16:01
Variants
P.108 Balliol T.Mk 1
Prototypes, 3 built, powered by the Armstrong Siddeley Mamba
P.108 Balliol T.Mk 1
Prototypes, 3 built, powered by the Armstrong Siddeley Mamba
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Re: Boulton Paul Balliol
par Belissar Dim 03 Oct 2010, 16:08
Balliol T.Mk 2
Two-seat advanced training aircraft for the RAF; 196 built, (166 built by Boulton Paul, and 30 built by Blackburn Aircraft).
Two-seat advanced training aircraft for the RAF; 196 built, (166 built by Boulton Paul, and 30 built by Blackburn Aircraft).
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- Messages : 388
Re: Boulton Paul Balliol
par Belissar Dim 03 Oct 2010, 16:10
Sea Balliol T.Mk 21
Two-seat advanced training aircraft for FAA. A total of 30 built by Boulton Paul.
Two-seat advanced training aircraft for FAA. A total of 30 built by Boulton Paul.
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