Saunders-Roe SR.177

infobox Aircraft
name = SR.177
type = mixed power interceptor
manufacturer = Saunders-Roe



caption = SR.177 with Red Top missiles
designer =
first flight =
introduced =
retired =
produced =
number built = 0
status =
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developed from = Saunders-Roe SR.53
variants with their own articles =The Saunders-Roe SR.177 was a 1950s project to develop a combined jet- and rocket-powered interceptor aircraft for the Royal Air Force and Royal Navy. The German Navy also expressed interest in the project, which was cancelled due to changes in Britain's military policies in 1957. An even larger variant was studied under the SR.187 project, but this work was also cancelled in 1957.

Design and development

In 1952, Saunders-Roe had won a contract to develop a similar aircraft, the Saunders-Roe SR.53. However, as development progressed, the shortcomings of the design became increasingly evident. Most particularly, as with the German rocket-powered interceptors of World War II, the range and endurance of such an aircraft were limited by the high rate of fuel consumption by the rocket engine. However, as turbojets developed and became increasingly powerful and efficient, soon new powerplants were available that would make the aircraft more practical.

The SR.177 began as an advanced design concept for the SR.53, but when a development contract was issued by the Ministry of Defence (specification F.155), the project was given its own designation.

The most significant difference between the two aircraft was the use of a jet engine with nearly five times the thrust of the one chosen for the earlier aircraft. This meant that while the SR.53 relied mostly on its rocket engine for climbing, the SR.177 would be able to add considerable endurance by conserving use of its rocket for the dash towards a target only. It was expected that the added endurance would allow the SR.177 to perform roles other than pure interception, and these were expected to include strike and reconnaissance. The SR.53 design was considerably enlarged to accommodate the new engine, and the original sleek lines were forfeited for a large, chin mounted intake to supply it with air.

Funding was secured in July 1956 for a total of 27 aircraft, and the first was expected to fly by April (later, October) 1958. However, 1957 was to see a massive re-thinking of air defence philosophy in the UK, outlined in the 1957 Defence White Paper which called for piloted warplanes to be replaced by missiles. By the time that the programme was axed later that year, the aircraft had proceeded little past mock-up stage.

Work on the aircraft continued a little longer, however, in the anticipation of continued interest from Germany. The British Ministry of Supply agreed to continue funding development of five of the six prototypes, but nothing was to come of it. The German government had changed its priorities from looking for an interceptor to a strike fighter, leading Saunders-Roe to redesign the aircraft for this role. This was followed immediately by another redesign when Rolls-Royce successfully convinced the German government to replace the de Havilland engine intended for the SR.177 with a Rolls-Royce turbojet, the RB.153. Even with Heinkel preparing to manufacture the aircraft locally under licence, Germany withdrew support and eventually chose to purchase the F-104 Starfighter instead, along with most of the European governments. This Lockheed coup, known as the "Deal of the Century", caused major political controversy in Europe and West German minister of defence Franz Josef Strauss was almost forced to resign over the issue. During later investigation into Lockheeds business practices it was discovered that Lockheed had paid out millions of dollars in 'Sales Incentives' in each of these countries to secure the deal. Prince Bernhard of the Netherlands confessed to taking more than 1 million USD in bribes from Lockheed to buy the F-104.

pecifications

aircraft specifications
plane or copter?=plane
jet or prop?=both

ref=

crew= one
capacity=
length main= 50 ft
length alt= 15.2 m
span main= 30 ft
span alt= 9.1 m
height main= 14 ft
height alt= 4.3 m
area main=
area alt=
airfoil=
empty weight main=
empty weight alt=
loaded weight main= 25,500 lb
loaded weight alt= 11,570 kg
useful load main=
useful load alt=
max takeoff weight main=
max takeoff weight alt=
more general=

engine (jet)= de Havilland Gyron Junior
type of jet= turbojet
number of jets= 1
thrust main= 8,000 lbf
thrust alt= 35.6 kN
thrust original=
afterburning thrust main=
afterburning thrust alt=
engine (prop)= de Havilland Spectre
type of prop= liquid fuel rocket
number of props= 1
power main= 8,000 lbf
power alt= 35.6 kN
power original=

max speed main= estimated 1,550 mph
max speed alt= 2,500 km/h
cruise speed main=
cruise speed alt=
never exceed speed main=
never exceed speed alt=
stall speed main=
stall speed alt=
range main=
range alt=
ceiling main= estimated 67,000 ft
ceiling alt= 20,500 m
climb rate main= estimated 60,000 ft/min
climb rate alt= 18,300 m/s
loading main=
loading alt=
thrust/weight=
power/mass main=
power/mass alt=
more performance=

armament=2 Firestreak air-to-air missiles [later the Firestreak Mark 4 - the Hawker Siddeley Red Top]

avionics=
* AI-23 airborne interception radar

ee also

aircontent

related=
SR.53, SR.182

similar aircraft=
Sud Ouest S.O.9000 - XF-91 Thunderceptor - Nord 1500 Griffon

sequence=

lists=
*List of aircraft of the RAF

References

External links

* [http://www.unrealaircraft.com/classics/sr_53_177.php Unreal aircraft]
* [http://worldatwar.net/chandelle/v1/v1n2/saro177.html Saro 177]
* [http://www.spaceuk.org/sr53/177/sr177.htm SR.177 at Spaceuk.org]
* [http://worldatwar.net/chandelle/v1/v1n2/saro177.html Rocket interceptors and S177]