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Short SB.6 Seamew
par Aniv2018 Mar 07 Sep 2010, 08:57
Le Short Seamew sur Wikipedia.en. Many thanks
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The Short SB.6 Seamew was a "curious-looking" British aircraft designed in 1951 by David Keith-Lucas of Shorts as a lightweight anti-submarine platform to replace the Royal Navy Fleet Air Arm (FAA)'s Grumman Avenger AS 4 with the Reserve branch of the service.
It first flew on 23 August 1953, but, due to poor performance coupled with shifting defence doctrine, it never reached service and only 19 were built before the project was cancelled.
It has been described as a "camel amongst race-horses".
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The Short SB.6 Seamew was a "curious-looking" British aircraft designed in 1951 by David Keith-Lucas of Shorts as a lightweight anti-submarine platform to replace the Royal Navy Fleet Air Arm (FAA)'s Grumman Avenger AS 4 with the Reserve branch of the service.
It first flew on 23 August 1953, but, due to poor performance coupled with shifting defence doctrine, it never reached service and only 19 were built before the project was cancelled.
It has been described as a "camel amongst race-horses".
Aniv2018- CLUB
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Re: Short SB.6 Seamew
par Aniv2018 Mar 07 Sep 2010, 08:58
Design and development
The Short Seamew was selected to fulfill Admiralty Specification M.123D for a simple, lightweight anti-submarine aircraft capable of unassisted operation from any of the Royal Navy's aircraft carriers in all but the worst of conditions.
Although specifically designed for naval operations, the Seamew was also intended for land-based use by the RAF.
The Short Seamew was selected to fulfill Admiralty Specification M.123D for a simple, lightweight anti-submarine aircraft capable of unassisted operation from any of the Royal Navy's aircraft carriers in all but the worst of conditions.
Although specifically designed for naval operations, the Seamew was also intended for land-based use by the RAF.
Aniv2018- CLUB
- Messages : 860
Re: Short SB.6 Seamew
par Aniv2018 Mar 07 Sep 2010, 09:00
It was to be suitable for mass production and operation by the Air Branch of the Royal Naval Volunteer Reserve (RNVR).
This specification was in response to the alarming increase in capabilities of the Soviet submarine forces following the Second World War.
This specification was in response to the alarming increase in capabilities of the Soviet submarine forces following the Second World War.
Aniv2018- CLUB
- Messages : 860
Re: Short SB.6 Seamew
par Aniv2018 Mar 07 Sep 2010, 09:01
Three prototypes were ordered in April 1952 and the first flight (XA209), piloted by its test pilot, Sqn. Ldr. Walter J. "Wally" Runciman, took place on 23 August 1953.
This same aircraft, also piloted by Runciman, took part in the 1953 Farnborough Airshow three weeks later.
In 1954 both XA209 and the second prototype XA213 took part at Farnborough, where the following year both prototypes and two production AS Mk 1 models (XE171 and XE172) gave a formation display.
This same aircraft, also piloted by Runciman, took part in the 1953 Farnborough Airshow three weeks later.
In 1954 both XA209 and the second prototype XA213 took part at Farnborough, where the following year both prototypes and two production AS Mk 1 models (XE171 and XE172) gave a formation display.
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Re: Short SB.6 Seamew
par Aniv2018 Mar 07 Sep 2010, 09:02
The MR Mark 2 was similar in every respect to the AS Mk 1 except that it was optimised for land-based use from hastily prepared airstrips.
Naval equipment was deleted although manual wing folding was retained.
Slightly heavier than the naval version, the MR Mk 2 had oversize tyres and could carry a higher weapons load.
Naval equipment was deleted although manual wing folding was retained.
Slightly heavier than the naval version, the MR Mk 2 had oversize tyres and could carry a higher weapons load.
Aniv2018- CLUB
- Messages : 860
Re: Short SB.6 Seamew
par Aniv2018 Mar 07 Sep 2010, 09:05
Design
The pilot and observer were located in tandem cockpits located high up in the front of the deep, narrow fuselage.
They sat atop the Armstrong Siddeley Mamba turboprop in front and the weapons bay to the rear of them.
The design had originally called for the tried and tested Rolls-Royce Merlin piston engine but the Royal Navy had made it policy to phase out piston engines, in order that supplies of highly flammable high octane aviation fuel need not be carried in large quantities on ships.
The turboprop engine also caused less airframe vibration and would therefore have less impact on the performance of the radar scanner mounted below the engine housing.
The pilot and observer were located in tandem cockpits located high up in the front of the deep, narrow fuselage.
They sat atop the Armstrong Siddeley Mamba turboprop in front and the weapons bay to the rear of them.
The design had originally called for the tried and tested Rolls-Royce Merlin piston engine but the Royal Navy had made it policy to phase out piston engines, in order that supplies of highly flammable high octane aviation fuel need not be carried in large quantities on ships.
The turboprop engine also caused less airframe vibration and would therefore have less impact on the performance of the radar scanner mounted below the engine housing.
Aniv2018- CLUB
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Re: Short SB.6 Seamew
par Aniv2018 Mar 07 Sep 2010, 09:10
For simplicity, and so that a nose wheel would not obscure the forward field of the radar scanner, a fixed tail wheel undercarriage was used.
The long stroke necessary on the main undercarriage to give the radar scanner and propeller adequate clearance from the ground resulted in an alarming attitude on the ground and the cockpits mounted at a seemingly perilous height.
The long stroke necessary on the main undercarriage to give the radar scanner and propeller adequate clearance from the ground resulted in an alarming attitude on the ground and the cockpits mounted at a seemingly perilous height.
Aniv2018- CLUB
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Re: Short SB.6 Seamew
par Aniv2018 Mar 07 Sep 2010, 09:11
The pilot and observer sat very far forward in order that the pilot could have a reasonable field of downward vision for takeoff and landing and so that both he and the observer had a good field of view e.g. for spotting submarines even when in level flight.
Aniv2018- CLUB
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Re: Short SB.6 Seamew
par Aniv2018 Mar 07 Sep 2010, 09:12
The large, broad-chord wings featured power-folding and pylons for the carriage of rockets, depth charges, flares and small bombs.
The large, slab-like, tailplane was mounted high on the vertical stabiliser, requiring the rudder to be split into upper and lower sections.
The fixed undercarriage legs could be jettisoned in the event of ditching.
The large, slab-like, tailplane was mounted high on the vertical stabiliser, requiring the rudder to be split into upper and lower sections.
The fixed undercarriage legs could be jettisoned in the event of ditching.
Aniv2018- CLUB
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Re: Short SB.6 Seamew
par Aniv2018 Mar 07 Sep 2010, 09:13
Handling Characteristics
The handling characteristics of the Seamew were poor.
The prototypes were heavily modified with fixed leading-edge slats, slots added in the trailing-edge flaps, alterations to the ailerons and slats added to the tailplane roots.
The handling characteristics of the Seamew were poor.
The prototypes were heavily modified with fixed leading-edge slats, slots added in the trailing-edge flaps, alterations to the ailerons and slats added to the tailplane roots.
Aniv2018- CLUB
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Re: Short SB.6 Seamew
par Aniv2018 Mar 07 Sep 2010, 09:15
Although something of an improvement over the initial models, the handling was never wholly satisfactory.
Arthur Pearcy wrote "only Short Brothers' test pilot Wally Runciman seemed able to outwit its vicious tendencies and exploit its latent manoeuvrability to the limit."
Arthur Pearcy wrote "only Short Brothers' test pilot Wally Runciman seemed able to outwit its vicious tendencies and exploit its latent manoeuvrability to the limit."
Aniv2018- CLUB
- Messages : 860
Re: Short SB.6 Seamew
par Aniv2018 Mar 07 Sep 2010, 09:16
Operational service
An order was placed in February 1955 for 60 aircraft (split evenly between the FAA and RAF), with Seamew XA213 successfully completing carrier trials on HMS Bulwark in July and December 1955.
Naval service flight trials with two Seamews were carried out with 700 Naval Air Squadron in November 1956, which included catapult trials and around 200 takeoffs and landings on HMS Warrior.
An order was placed in February 1955 for 60 aircraft (split evenly between the FAA and RAF), with Seamew XA213 successfully completing carrier trials on HMS Bulwark in July and December 1955.
Naval service flight trials with two Seamews were carried out with 700 Naval Air Squadron in November 1956, which included catapult trials and around 200 takeoffs and landings on HMS Warrior.
Aniv2018- CLUB
- Messages : 860
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