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Handley Page Hendon (HP.25)

Biplane Torpedo Bomber Prototype Aircraft

Handley Page Hendon (HP.25)

Biplane Torpedo Bomber Prototype Aircraft

OVERVIEW
SPECIFICATIONS
ARMAMENT
VARIANTS
HISTORY
IMAGES
Overview



Just six prototypes made up the twin-seat Handley Page Hendon - developed from the earlier Hanley single-seat biplane - torpedo bomber program.
National Flag Graphic
ORIGIN: United Kingdom
YEAR: 1924
STATUS: Cancelled
MANUFACTURER(S): Handley Page - UK
PRODUCTION: 6
OPERATORS: United Kingdom (cancelled)
National flag of United Kingdom
UK
Technical Specifications



Unless otherwise noted the presented statistics below pertain to the Handley Page Type Ta / HP.25 model. Common measurements, and their respective conversions, are shown when possible.
CREW: 2
POWER: 1 x Napier Lion IIB 12-cylinder water-cooled engine developing 450 horsepower and driving a two-bladed wooden propeller at the nose.
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Armament



STANDARD:
1 x 0.303 Vickers Machine Gun in fixed, forward-firing mounting over the nose and synchronized to fire through the spinning propeller blades.
1 x 0.303 Lewis Machine Gun on trainable mounting in rear cockpit.

OPTIONAL:
1 x 18" (457mm) aerial torpedo OR 2 x 230lb conventional drop bombs.
Graphical image of an aircraft aerial torpedo
Graphical image of an aircraft conventional drop bomb munition
Variants / Models



• "Hendon" - Base Series Name.
• Hendon I - Initial prototype design based in the single-seat Hanley III torpedo carrier prototype; six examples completed as test aircraft under FAA contract.
• Hendon II - Three Hendon III aircraft with modified leading edge wings.
• Hendon III - One-off modification of Hendon II aircraft; slotted flaps added.


History



Detailing the development and operational history of the Handley Page Hendon (HP.25) Biplane Torpedo Bomber Prototype Aircraft.  Entry last updated on 1/31/2019. Authored by Staff Writer. Content ©www.MilitaryFactory.com.
Part of the work completed by Handley Page during the early 1920s, in an attempt to satisfy a standing Fleet Air Arm (FAA) requirement of 1920 for a modern carrier-based torpedo bomber, was the "Hendon". This twin-seat torpedo-carrying biplane was built alongside the single-seat "Hanley" of similar form and function, both of which would ultimately be passed over for the Blackburn "Dart" (detailed elsewhere on this site). The Hendon was completed in six prototype examples and flown in 1924 but these ended their days as test aircraft for various wing surface control fittings and carrier operation evaluations.

The aircraft exhibited many qualities of the time: an over-under biplane wing configuration, open-air cockpit, and fixed tail-dragger undercarriage. The wings were multi-bayed with parallel struts and left unstaggered. The engine was positioned at the nose in the usual way and drove a two-bladed propeller. The cockpit was seated near midships with generally poor views for the pilot (the machine gunner was directly behind). The fuselage sported slab sides and tapered towards the tail to which a single-finned rudder was affixed. The undercarriage involved a twin-wheeled component under the forward mass of the aircraft with a simple tail skid under the rear.

FAA authorities saw enough value in the Hendon to order is as a test aeroplane through a contract given on November 27th, 1923 - this to cover a total of six aircraft. Hanley had designed this two-seater from the final Hanley form, the Hanley III. The Hanley III was the third of three iterations born from the Hanley project and ultimately rectified control issues in the design while incorporating full-span leading edge slots for low-altitude, low-speed handling crucial to carrier operations. Specification 25/23 was drawn up to cover the new aircraft, then known as the "Type Ta" (retrospectively redesignated to "HP.25").

A first-flight of the prototype Hendon was recorded on July 7th, 1924 and the entire lot was constructed before the end of the year for further testing. Some revisions were made to the design when the full war load was added, resulting in slight sweepback of the wing mainplanes to offset heavier loads placed on the tail section.

Three distinct variants of the Hendon were completed: Hendon I, Hendon II, and Hendon III. The Hendon II mark were three revised Hendon I aircraft with improved slot gear and the Hendon III was a one-off conversion of a Hendon II model with slotted flaps.

The basic approach to the design borrowed much from the Hanley save for a slightly lengthened fuselage to accommodate the second crewmember - as such a tandem-seat arrangement was used. Dimensions included a running length of 34.5 feet, a wingspan of 46 feet, and a height of 13.7 feet. Empty weight reached 4,350lb and the Maximum Take-Off Weight (MTOW) reached 7,000lb. Power was from a Napier Lion IIB 12-cylinder, water-cooled unit of 450 horsepower - the same engine featured in the earlier Hanley and the competing Dart aircraft - and this was used to power a two-bladed wooden propeller at the nose. Performance specs included a maximum speed of 110 miles-per-hour with a service ceiling up to 9,500 feet.

Standard armament was a single 0.303 Vickers Machine Gun over the nose in a fixed, forward-firing mounting synchronized to fire through the spinning propeller blades as well as a single 0.303 Lewis Machine Gun on a trainable mounting at the rear cockpit. The bombload was either a single 18" (457mm) aerial torpedo or 2 x 230lb drop bombs.




Media







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
Hi: 120mph
Lo: 60mph
This entry's maximum listed speed (110mph).

Graph average of 90 miles-per-hour.
Aviation Era
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Unit Production (6)
Comm. Market HI*: 44,000 units
Military Market HI**: 36,183 units
6
6

  * Commercial Market High belongs to Cessna 172.

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


Altitude Visualization
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Supported Roles
A2A
Interception
UAV
Ground Attack
CAS
Training
ASW
Anti-Ship
AEW
MEDEVAC
EW
Maritime/Navy
SAR
Aerial Tanker
Utility/Transport
VIP
Passenger
Business
Recon
SPECOPS
X-Plane/Development
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.


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