×
Aircraft / Aviation Vehicles & Artillery Infantry Arms Warships & Submarines Military Pay Scale Military Ranks
HOME
AIRCRAFT / AVIATION
MODERN AIR FORCES
COUNTRIES
MANUFACTURERS
COMPARE
BY CONFLICT
BY TYPE
BY DECADE
GOLDEN AGE
WORLD WAR 2

Northrop Delta


Single-Engine Monoplane Airliner (1933)


Aviation / Aerospace

1 / 1
Image from the Public Domain.

Jump-to: Specifications

The Northrop Delta was a further development of the interwar Gamma mail carrier - though reworked for the passenger airliner role.



Authored By: Staff Writer | Last Edited: 09/25/2020 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.
The Northrop "Delta" was an Interwar monoplane aircraft design by the Northrop Corporation - one of the first to be completed by the newly-founded company through its joint-venture initiative with powerhouse Douglas Aircraft Company. Designed by founder Jack Northrop himself, the product was developed along the lines of a single-engine passenger hauler and borrowed qualities from the earlier all-metal Northrop "Gamma" monoplane mail carrier of 1932. However, just thirty-two of the Delta were produced though the line went on to see both military and civilian service globally. First-flight was had in May of 1933 with type certification and service entry following later that year.

While the Gamma was a sleek, slim speedster, the related Delta was an enlarged form with wider fuselage to better accommodate the intended passenger seating arrangement. This resulted in a stocky, cumbersome appearance for the metal aircraft which utilized a low-wing monoplane (the same as on the Gamma), spatted/fixed main landing gear legs (tail-dragger configuration), and traditional single-finned tail unit. The engine was fitted to the nose and the flight deck (seating two side-by-side) directly aft.

Primarily power by a Wright SR-1820 nine-cylinder air-cooled radial piston engine developing 735 horsepower and driving a two-bladed propeller unit in tractor fashion. Performance indicated a maximum speed of 220 miles-per-hour, a cruising speed closer to 200 mph, a range out to 1,650 miles, and a service ceiling up to 20,000 feet. Rate-of-climb was 1,200 feet-per-minute.

The prototype was designated "Delta 1A" and carried the Wright SR-1820-F3 "Cyclone" air-cooled radial piston engine of 710 horsepower. "Delta 1B" was delivered to Pan-Am and powered by the Pratt & Whitney "Hornet" radial of 660 horsepower. "Delta 1C" followed for AN Aerotransport and carried the Hornet engine of 700 horsepower. "Delta 1D" was an executive passenger hauler and could be fitted with either Cyclone or Hornet series radials - one falling to the United States Coast Guard (USCG). "Delta 1E" became a one-off example for the mail carrier role and completed for AB Aerotransport, this entry powered by a Hornet engine of 660 horsepower.

The promising design was derailed somewhat when, in October of 1934, American civilian aviation authorities restricted night time / rough terrain over-flights involving passengers for single-engined types like the Delta. With its fortunes immediately changed, just three were completed to the original standard for the airliner role (this included the sole prototype). Instead, the lot went on to be utilized in the mail-carrying role where one example was lost to accident and another to a fire. Seven were built for private ownership and operation and three of this lot were taken on by Spanish Republican forces for service in the bloody Spanish Civil War (1936-1939). The opposing Nationalist forces then captured two of these.

Because of their versatility, the airframe being capable of fitting wheels, floats, or skis as the undercarriage, the Royal Canadian Air Force (RCAF) became interested in the Northrop offering and moved to adopt the series in 1935 for the critical photo-surveying / over-water role. Construction of these RCAF examples would be handled locally by the Canadian Vickers aero-concern (under license) and marked the first all-metal-skinned aircraft operated by the service. A first-flight of an RCAF-destined Delta was recorded on August 16th, 1936 and deliveries followed that September. However, a mixed service recorded meant that the series was only in service until the end of 1941 - with World War 2 (1939-1945) in full swing by then.

RCAF Deltas included the Delta I, Delta IA, Delta II, and Delta III. The Delta I came equipped with the Cyclone SR-1820-F52 radial of 775 horsepower with production encompassing three examples. The Delta II was wholly revised by installation of a dorsal machine-gun-armed turret, wing-mounted machine guns, and a bomb-carrying capability for the attack role. The Delta IA was, therefore, Delta I forms modified to the Delta II standard for combat service. The Delta III had its tail surfaces enlarged for improved controlling and eight were built to the standard.

When their frontline usefulness was over, the fleet was relegated to the training role and other second-line duties for the remainder of their days under the RCAF banner. Before their end, Deltas formed three total RCAF squadrons: Nos. 8, 119, and 120.

The Royal Australian Air Force (RAAF) obtained just a single Delta during the war years and operated the design from late-1942 until September of 1943. The USCG became the only other notable military operator and acquired a sole Delta 1D as the RT-1 - this powered by a Cyclone radial of 735 horsepower. The remaining operators were civilian in nature and included Australia (at the Civil Aviation Authority level), Mexico (the Pan-Am subsidiary Aerovias Centrales SA), Sweden (through AB Transport), and the United States (mainly in the executive transport role).

Specifications



Service Year
1933

Origin
United States national flag graphic
United States

Status
RETIRED
Not in Service.
Crew
2

Production
32
UNITS


Northrop Corporation - USA / Canadian Vickers - Canada
National flag of Australia National flag of Canada National flag of Mexico National flag of Spain National flag of Sweden National flag of the United States Australia; Canada; Mexico; Spain; Sweden; United States
(OPERATORS list includes past, present, and future operators when applicable)
Ground Attack (Bombing, Strafing)
Ability to conduct aerial bombing of ground targets by way of (but not limited to) guns, bombs, missiles, rockets, and the like.
Special-Mission: Anti-Submarine Warfare (ASW)
Equipped to search, track, and engage enemy underwater elements by way of specialized onboard equipment and weapons.
Transport
General transport functionality to move supplies/cargo or personnel (including wounded and VIP) over range.
Commercial Aviation
Used in roles serving the commercial aviation market, ferrying both passengers and goods over range.
Training (General)
Developed ability to be used as a dedicated trainer for student pilots (typically under the supervision of an instructor).


Length
32.8 ft
(10.00 m)
Width/Span
47.6 ft
(14.50 m)
Height
10.2 ft
(3.10 m)
Empty Wgt
4,542 lb
(2,060 kg)
MTOW
7,352 lb
(3,335 kg)
Wgt Diff
+2,811 lb
(+1,275 kg)
(Showcased structural values pertain to the Northrop Delta 1D-5 production variant)
Installed: 1 x Wright SE-1820-F2 9-cylinder air-cooled radial piston engine developing 735 horsepower driving two-bladed propeller unit at the nose.
Max Speed
221 mph
(355 kph | 192 kts)
Ceiling
20,013 ft
(6,100 m | 4 mi)
Range
1,650 mi
(2,655 km | 4,917 nm)
Rate-of-Climb
1,200 ft/min
(366 m/min)


♦ MACH Regime (Sonic)
Sub
Trans
Super
Hyper
HiHyper
ReEntry
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 Northrop Delta 1D-5 production variant. Compare this aircraft entry against any other in our database. View aircraft by powerplant type)
Typically none though RCAF versions modified with dorsal turret fitting 1 x 7.7mm machine gun and 7.7mm machine guns at each wing mainplane. Also bomb-carrying capability added.


Supported Types


Graphical image of an aircraft medium machine gun
Graphical image of an aircraft conventional drop bomb munition


(Not all ordnance types may be represented in the showcase above)
Hardpoint Mountings: 0


Delta - Base Series Name.
Delta 1A - Prototype with Wright SR-1820-F3 "Cyclone" radial engine; single-exampple.
Delta 1B - Powered by Pratt & Whitney "Hornet" of 660 horsepower; single-example completed for Pan-Am for airliner duty.
Delta 1C - PW Hornet engine of 700 horsepower; built for airliner duty with AN Aerotransport.
Delta 1D - VIP airliner; Wright or PW engine fit; eight completed.
Delta I - RCAF photographic surveyor aircraft; Cyclone engine of 775 horsepower.
Delta IA - RCAF Delta I to Dalta II standard with bomb racks installed.
Delta II - RCAF military attacker with dorsal turret fitting machine gun, machine gun in wings, and bomb-carrying capability; nine examples modified as such.
Delta III - RCAF Mk.II with enlarged tailplanes; eight examples.
RT-1 - Single example for USCG service from Delta 1D stock; Cyclone engine of 735 fitted.


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


Ribbon graphics not necessarily indicative of actual historical campaign ribbons. Ribbons are clickable to their respective aerial campaigns / operations / aviation periods.

Disclaimer | Privacy Policy | Cookies


2021 Military Pay Scale Army Ranks Navy Ranks Air Force Ranks Alphabet Code DoD Dictionary American War Deaths French Military Victories Vietnam War Casualties

The "Military Factory" name and MilitaryFactory.com logo are registered ® U.S. trademarks protected by all applicable domestic and international intellectual property laws. All written content, illustrations, and photography are unique to this website (unless where indicated) and not for reuse/reproduction in any form. Material presented throughout this website is for historical and entertainment value only and should not to be construed as usable for hardware restoration, maintenance, or general operation. We do not sell any of the items showcased on this site. Please direct all other inquiries to militaryfactory AT gmail.com.

Part of a network of sites that includes GlobalFirepower, a data-driven property used in ranking the top military powers of the world, WDMMA.org, the World Directory of Modern Military Aircraft, and SR71blackbird.org, detailing the history of the world's most iconic spyplane.


Facebook Logo YouTube Logo

www.MilitaryFactory.com • All Rights Reserved • Content ©2003-