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Saunders-Roe P.187

High-Speed Interceptor Proposal [ 1955 ]

The Saunders-Roe would have been a massive, powerful interceptor tool for the British during the Cold War years had it been allowed to mature.

Authored By: Staff Writer | Last Edited: 03/19/2019 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

Before the White Defence Paper review of 1957, which doomed many-a-manned aircraft project for Britain, there were many designs put forth by its aero-industry to satisfy a new interceptor requirement known as "F.155T". Among the many design submissions was a large and powerful high-performance jet-and-rocket (combination propulsion scheme) aircraft proposed as the "P.187" by Saunders-Roe (SARO). The project, like many others of the period, only made it to the "paper airplane" stage for its time in Cold War history (1947-1991).

Fresh off the heels of World War 2 (1939-1945), the world entered into a new global conflict, the "Cold War", which pitted East versus West philosophies, politics, and military might against one another. For the West, led by such powers as the United States, Britain, and a rebuilding France, the major threat that soon emerged was the high-speed, high-flying nuclear-capable bomber of the Soviet Air Force. In response there was heavy investment in interceptor types, particularly those centered on turbojet power, to counter the threat and, for the British, this led to requirements like "F.155T".

To this point (early-to-mid-1950s), Saunders-Roe had completed a good deal of research and physical work in the realm of turbojet-and-rocket-assisted aircraft types. The "SR.53" - detailed elsewhere on this site - was of particular note as it served as a single-seat, single-engine high-performance interceptor (in prototype form) which failed to garner the needed support of British authorities mainly due to the advance of ground-based enemy missile technology - rendering the once-untouchable interceptors moot. Nevertheless, two flyable examples of this aircraft were completed by SARO and the data collected during the program heavily influenced the design of what would become the P.187 project airplane.

The assistance provided by SR.53 was notable for it was to enable SARO engineers to get a working product into the air in the shortest amount of time possible en route to Initial Operating Capability (IOC). Beyond its general form, which only superficially followed that of the SR.53, the P.187 would be wholly unique. it would carry a crew of two - pilot and navigator - and house radar in its nose section, an assembly that was designed to "slide" so as to provide enhanced vision out-of-the-cockpit when landing, taking-off and general ground-running actions while become streamlined when the aircraft was in flight to maintain aerodynamic efficiency (similar to the feature used in the later Aerospatiale / BAC Concorde supersonic airliner).

The aircraft had a deep, portly body in its side profile and this was partly due to the engine placement within the fuselage, set low and against the sides with aspiration (each component was bifurcated/split) had under the cockpit floor line and exhausting through ports located under (and ahead) of the tail section. The tail section was given a single vertical fin with the horizontal planes seated at the absolute top of the structure. Airbrakes would be installed at either side of the rear fuselage. Ground-running was to be handled by a heavy-duty, wheeled tricycle arrangement with a dual-wheeled nose leg and dual-wheeled (in line) main legs - all retracting into the body.©MilitaryFactory.com
The mainplanes were clipped deltas with sweepback found along their leading edge and the trailing edges would be straight-lined. The clipped nature of the wing tips allowed for mounting of wingtip missiles. Control surfaces would line the trailing edges of the mainplane members and the complete unit would be mid-mounted along the sides of the fuselage, each given noticeable anhedral (downward angle).

The cockpit was drawn up to seat its crew side-by-side though the heavier glazing found at the pilot's position. Because of the speeds and altitudes at play, an ejection system and pressurization figured into the mix.

To propel this oversized interceptor, a full complement of turbojet engines supplemented by rocket power would be in play: 2 x de Havilland PS.52 "Gyron" increased-pressure ratio, afterburning turbojet engines of 35,000lb thrust and no fewer than 4 x de Havilland "Spectre 5" series rocket boosters of 10,000lb thrust. The turbojets would set under the aircraft as normal with the Spectre boosters installed over them (under the tail unit) in a side-by-side arrangement. Collectively, and coupled with the streamlined form of the fuselage, the aircraft was expected to reach speeds near Mach 2.5 (at altitude), or a rather impressive 1,855 miles-per-hour.

To satisfy the actual air-to-air "interceptor" portion of the requirement, the P.187 was to make use of two advanced Air-to-Air Missiles (AAMs) of the period, "Blue Jay" Mk.4 and "Red Dean". There would be four total AAMs missiles carried by the aircraft, two of each kind (these set to cover radar-guided and InfraRed types), with a hardpoint found at each wingtip (for the Red Dean missiles) and a single hardpoint under each wing (for the Blue Jay missiles).

As drawn up, P.187 sported an estimated empty weight of 55,000lb with a Maximum Take-Off Weight (MTOW) nearing 97,000lb. Overall length reached 83.5 feet with a wingspan of 51.6 feet and a height of 21.7 feet. Additional estimates rated the aircraft to altitudes greater than 60,000 feet with an intercepting range out to 260 miles.

For the F.155T requirement, this aerial machine was not only powerful for the period but also quite large and heavy and would have made for an impressive design should it have come to fruition. However, as promising as it was, it was not furthered beyond its line drawings. Plans were had for additional engineering work to be had including wind tunnel testing but all this came to naught - mainly due to the 1957 defense review which saw a future battlefield dominated by air-to-air and surface-to-air missiles.©MilitaryFactory.com
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Service Year

United Kingdom national flag graphic
United Kingdom

Development Ended.


National flag of the United Kingdom United Kingdom (abandoned)
(OPERATORS list includes past, present, and future operators when applicable)
Ability to intercept inbound aerial threats by way of high-performance, typically speed and rate-of-climb.
X-Plane (Developmental, Prototype, Technology Demonstrator)
Aircraft developed for the role of prototyping, technology demonstration, or research / data collection.

80.2 ft
(24.45 m)
51.5 ft
(15.70 m)
21.7 ft
(6.61 m)
Empty Wgt
55,116 lb
(25,000 kg)
97,003 lb
(44,000 kg)
Wgt Diff
+41,888 lb
(+19,000 kg)
(Showcased structural values pertain to the base Saunders-Roe P.187 production variant)
Installed: 2 x de Havilland P.S.52 "Gyron" afterburning (reheat) turbojet engines developing 35,000lb of thrust; 4 x de Havilland "Spectre 5" rocket booters developing 10,000lb of thrust.
Max Speed
1,917 mph
(3,085 kph | 1,666 kts)
76,001 ft
(23,165 m | 14 mi)
391 mi
(630 km | 1,167 nm)
10,000 ft/min
(3,048 m/min)

♦ MACH Regime (Sonic)
RANGES (MPH) Subsonic: <614mph | Transonic: 614-921 | Supersonic: 921-3836 | Hypersonic: 3836-7673 | Hi-Hypersonic: 7673-19180 | Reentry: >19030

(Showcased performance specifications pertain to the base Saunders-Roe P.187 production variant. Performance specifications showcased above are subject to environmental factors as well as aircraft configuration. Estimates are made when Real Data not available. Compare this aircraft entry against any other in our database or View aircraft by powerplant type)
2 x "Red Dean" air-to-air missiles on wingtip mounts.
2 x "Blue Jay" Mk.4 air-to-air missiles at underwing hardpoints.

Supported Types

Graphical image of an air-to-air missile weapon
Graphical image of a short-range air-to-air missile

(Not all ordnance types may be represented in the showcase above)
Hardpoint Mountings: 4

P.187 - Base Project Designation.

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