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Handley Page HP.115

Delta-Wing Research Aircraft

Handley Page HP.115

Delta-Wing Research Aircraft


The Royal Aircraft Establishment of Britain relied on a single example of the excellent Handley Page HP.115 technology demonstrator for research into delta-winged planforms.
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ORIGIN: United Kingdom
YEAR: 1961
STATUS: Retired, Out-of-Service
MANUFACTURER(S): Handley Page - UK
OPERATORS: United Kingdom

Unless otherwise noted the presented statistics below pertain to the Handley Page HP.115 model. Common measurements, and their respective conversions, are shown when possible.
LENGTH: 50.36 feet (15.35 meters)
WIDTH: 19.69 feet (6 meters)
HEIGHT: 12.80 feet (3.9 meters)
WEIGHT (EMPTY): 3,682 pounds (1,670 kilograms)
WEIGHT (MTOW): 5,071 pounds (2,300 kilograms)
ENGINE: 1 x Bristol Siddeley Viper BSV.9 turbojet engine developing 1,900 lb of thrust.
SPEED (MAX): 249 miles-per-hour (400 kilometers-per-hour; 216 knots)



Series Model Variants
• HP.115 - Base Project Designation; single flyable example completed.


Detailing the development and operational history of the Handley Page HP.115 Delta-Wing Research Aircraft.  Entry last updated on 12/12/2018. Authored by Staff Writer. Content ©
In the post-World War 2 (1939-1945) period, both conventional and extreme aircraft developments were en vogue and not solely confined to the United States and the Soviet Union for the powers of Europe were also busy in presenting all-new forms for review. Case-in-point the Handley Page "HP.115", developed as a delta-winged aircraft for the purpose of detailing low-speed handling characteristics for a possible future supersonic passenger hauler. The vehicle was a true technology demonstrator, living its entire career as a research platform, and was instrumental in helping to bring about the famous British-French BAe/Aerospatiale "Concord" supersonic passenger airliner.

The HP.115 was primarily operated by the Royal Aircraft Establishment (RAE) research arm for its time in the air.


In the latter part of the 1950s, British researchers were already understanding that a Mach 2-capable passenger airliner would be relying on a delta-winged planform and considered various sub-designs of this very wing configuration, ultimately settling on the "ogival" approach. - a more elegantly-shaped platform which saw smoother leading edges coupled to straight-lined trailing edges. To prove its low-speed handling qualities on a flyable design, the wings were constructed to fit on a single-seat, single-engined (jet-powered) technology demonstrator offered by Handley Page, the model HP.115. Meanwhile, Fairey worked on the "Delta 2" to prove the high-speed qualities of the same passenger airliner proposal.

A contract in December of 1959 was drawn up to cover the Handley Page work on its powered aircraft after thoughts of an unpowered glider form were abandoned. Off-the-shelf components would be used in the construction of the research aircraft in an effort to get it into the air as quickly (and cheaply) as possible. The resulting design was of very conventional appearance save for its engine powerplant fitted at the base of the vertical tail fin (to clear the wings for pure data use/collection).

As a delta-wing-configured aircraft, there were no horizontal tailplanes for the mainplanes took up all of the horizontal surface area, offering the required controlling, drag, and lift properties. The single-seat cockpit was positioned at the front of the slim fuselage in the traditional way and offered excellent vision for the pilot. For ground-running, a tricycle undercarriage configuration was used - the legs were fixed in flight and not retractable to retain operating/maintenance simplicity. Beyond its engine placement, one of the more unique aspects of the aircraft's design was its fuselage which was cinched along its ventral line between cockpit and center mass - this was obvious when the aircraft was viewed in the side profile. Lightweight alloys were used throughout its construction and the wing mainplanes had a feature where leading edges could be exchanged with different shapes for "quick-testing" purposes. The engine-of-choice became the Armstrong Siddeley "Viper" ASV.9 jet engine - this installed in a streamlined, fin-mounted nacelle.


The HP.115 made it into the air for the first time on August 17th, 1961 and the product was put on display at the various Farnborough aviation gatherings from 1961 into 1964 for public consumption. Testing continued uninterrupted for the most part and proved the technologically-laden research aircraft through-and-through.

The active flying phase for this exceptional aircraft was largely trouble-free save for an undercarriage incident taking place on November 20th, 1964. During its take-off (following a rolling landing test), structural fatigue in the port-side landing gear member left it damaged and at an awkward angle. Rather amazingly, the test pilot returned the experimental aircraft safely to the ground intact after following proper crash landing procedures and using skill at the controls. This proved a relatively minor setback for the aircraft which remained in repair until May of 1965.

In total, the specimen completed 1,060 total test sorties with its final flight recorded in August of 1973 - no fewer than sixty-one test pilots were part of the aircraft's history which helped to pave the way for the classic Concorde.


Our Data Modules allow for quick visual reference when comparing a single entry against contemporary designs. Areas covered include general ratings, speed assessments, and relative ranges based on distances between major cities.

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Relative Maximum Speed Rating
Hi: 300mph
Lo: 150mph
    This entry's maximum listed speed (249mph).

    Graph average of 225 miles-per-hour.
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Unit Production Comparison
Comm. Market HI*: 44,000 units
Military Market HI**: 36,183 units

  * Commercial Market High belongs to Cessna 172.

  ** Military Market High belongs to Ilyushin Il-2.

Supported Roles
Ground Attack
Aerial Tanker
A2A=Air-to-Air; UAV=Unmanned; CAS=Close Support; ASW=Anti-Submarine; AEW=Airborne Early Warning; MEDEVAC=Medical Evac; EW=Electronic Warfare; SAR=Search-Rescue
Commitments / Honors
Military lapel ribbon for Operation Allied Force
Military lapel ribbon for the Arab-Israeli War
Military lapel ribbon for the Battle of Britain
Military lapel ribbon for the Battle of Midway
Military lapel ribbon for the Berlin Airlift
Military lapel ribbon for the Chaco War
Military lapel ribbon for the Cold War
Military lapel ribbon for the Cuban Missile Crisis
Military lapel ribbon for pioneering aircraft
Military lapel ribbon for the Falklands War
Military lapel ribbon for the French-Indochina War
Military lapel ribbon for the Golden Age of Flight
Military lapel ribbon for the 1991 Gulf War
Military lapel ribbon for the Indo-Pak Wars
Military lapel ribbon for the Iran-Iraq War
Military lapel ribbon for the Korean War
Military lapel ribbon for the 1982 Lebanon War
Military lapel ribbon for the Malayan Emergency
Military lapel ribbon representing modern aircraft
Military lapel ribbon for the attack on Pearl Harbor
Military lapel ribbon for the Six Day War
Military lapel ribbon for the Soviet-Afghan War
Military lapel ribbon for the Spanish Civil War
Military lapel ribbon for the Suez Crisis
Military lapel ribbon for the Vietnam War
Military lapel ribbon for Warsaw Pact of the Cold War-era
Military lapel ribbon for the WASP (WW2)
Military lapel ribbon for the World War 1
Military lapel ribbon for the World War 2
Military lapel ribbon for the Yom Kippur War
Military lapel ribbon for experimental x-plane aircraft
* Ribbons not necessarily indicative of actual historical campaign ribbons. Ribbons are clickable to their respective campaigns/operations.