Northrop BT
1935 bomber aircraft family
title: "Northrop BT" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["northrop-aircraft", "1930s-united-states-bomber-aircraft", "single-engined-tractor-aircraft", "low-wing-aircraft", "carrier-based-aircraft", "aircraft-first-flown-in-1935", "aircraft-with-retractable-conventional-landing-gear", "single-engined-piston-aircraft"] description: "1935 bomber aircraft family" topic_path: "geography/united-states" source: "https://en.wikipedia.org/wiki/Northrop_BT" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary 1935 bomber aircraft family ::
::data[format=table title="Infobox aircraft"]
| Field | Value |
|---|---|
| name | BT |
| image | File:NorthropBT Oct1941 Miami.jpg |
| caption | Northrop BT-1s over Miami in October 1939 |
| type | Dive bomber |
| national_origin | United States |
| manufacturer | Northrop Corporation |
| first_flight | 19 August 1935 |
| number_built | 55 |
| primary_user | United States Navy |
| developed_into | Douglas SBD Dauntless |
| :: |
|name = BT |image = File:NorthropBT Oct1941 Miami.jpg |caption = Northrop BT-1s over Miami in October 1939 |type = Dive bomber |national_origin = United States |manufacturer = Northrop Corporation |designer = |first_flight = 19 August 1935 |introduction = |retired = |produced = |number_built = 55 |status = |unit cost = |primary_user = United States Navy |more_users = |developed_from = |variants = |developed_into= Douglas SBD Dauntless
The Northrop BT was an American two-seat, single-engine monoplane dive bomber built by the Northrop Corporation for the United States Navy. At the time, Northrop was a subsidiary of the Douglas Aircraft Company. While unsuccessful in its own right, the BT was subsequently redesigned into the Douglas SBD Dauntless, which would form the backbone of the Navy's dive bomber force.
Design and development
The design of the initial version began in 1935. It was powered by a 700 hp Pratt and Whitney XR-1535-66 double row air-cooled radial engine and had hydraulically actuated perforated split flaps (dive brakes), and main landing gear that retracted backwards into fairing "trousers" beneath the wings. The perforated flaps were invented to eliminate tail buffeting during diving maneuvers.
The next iteration of the BT, the XBT-1, was equipped with a 750 hp R-1535. This aircraft was followed in 1936 by the BT-1, powered by an 825 hp R-1535-94 engine. One BT-1 was modified with a fixed tricycle landing gear and was the first such aircraft to land on an aircraft carrier.
::figure[src="https://upload.wikimedia.org/wikipedia/commons/6/66/BT-1_5-B-10_NAN6-61.jpg" caption="BT-1 of VB-5 in 1938"] ::
The final variant, the XBT-2, was a BT-1 modified to incorporate landing gear which folded laterally into recessed wheel wells, leading edge slots, a redesigned canopy, and was powered by an 800 hp Wright XR-1820-32 radial. The XBT-2 first flew on 25 April 1938, and after successful testing the Navy placed an order for 144 aircraft. In 1939 the aircraft designation was changed to the Douglas SBD-1 with the last 87 on order completed as SBD-2s. By this point, Northrop had become the El Segundo division of Douglas aircraft, hence the change.
Operational history
::figure[src="https://upload.wikimedia.org/wikipedia/commons/d/de/Northrop_BT-1_at_El_Segundo.jpeg" caption="BT-1 at El Segundo"] ::
::figure[src="https://upload.wikimedia.org/wikipedia/commons/2/22/Northrop_BT-1s_of_VB-5_lined_up.jpeg" caption="VB-5 lineup of BT-1s"] ::
The U.S. Navy placed an order for 54 BT-1s in 1936 with the aircraft entering service during 1938. BT-1s served on and . The type was not a success in service due to poor handling characteristics, especially at low speeds, "a fatal flaw in a carrier based aircraft." It was also prone to unexpected rolls and a number of aircraft were lost in crashes.
Variants
;XBT-1 :Prototype, one built. ;BT-1 :Production variant, 54 built. ;BT-1S: A BT-1 (c/n346, BuNo 0643) was fitted with a fixed tri-cycle undercarriage. This aircraft was damaged in a crash on 6 February 1939, returned to Douglas and repaired to BT-1 standard. ::figure[src="https://upload.wikimedia.org/wikipedia/commons/1/1e/Northrop_XBT-1_and_XBT-2_comparison.jpg" caption="Comparison between the XBT-1 (BuNo 9745) and XBT-2 (BuNo 0627) on 4 December 1936"] ::
;XBT-2 :One BT-1 modified with fully retractable landing gear and other modifications. ;BT-2 :Production variant of the XBT-2, 144 on order completed as SBD-1 and SBD-2. ;Douglas DB-19 :One BT-1 (c/n346, BuNo 0643), the former BT-1S, was modified as the DB-19 which was tested by the Imperial Japanese Navy as the Douglas DXD1 (long designation - Douglas Navy Experimental Type D Attack Aircraft)
Operators
;
Specifications (BT-1)
::figure[src="https://upload.wikimedia.org/wikipedia/commons/5/5f/Northrop_BT-1_tricycle.jpg" caption="BT-1 modified as a testbed for tricycle landing gear"] ::
|prime units?=kts |ref=United States Navy Aircraft since 1911 |crew= two (pilot and gunner) |length ft= 31 |length in= 8 |length m= 9.65 |span ft= 41 |span in= 6 |span m= 12.65 |height ft= 9 |height in=11 |height m= 3.02 |wing area sqft= 319 |wing area sqm= 29.6 |empty weight lb= 4,606 |empty weight kg= 2,094 |max takeoff weight lb= 7,197 |max takeoff weight kg= 3,271 |eng1 name= Pratt & Whitney R-1535-94 Twin Wasp Jr. |eng1 type=double row radial air-cooled engine |eng1 number=1 |eng1 hp= 825 |eng1 kw= 615 |max speed kts= 193 |max speed mph= 222 |max speed kmh= 357 |max speed note=at 9,500 ft (2,900 m) |cruise speed kts= 167 |cruise speed mph= 192 |cruise speed kmh= 309 |range nmi= 1,000 |range miles=1,150 |range km=1,852 |ceiling ft= 25,300 |ceiling m= 7,710 |climb rate ftmin=1,270 |climb rate ms=6.5 |guns=
- 1 × forward firing 0.50 in Browning machine gun
- 1 × 0.30 in machine gun in rear cockpit |bombs= 1,000 lb (454 kg) bomb under fuselage
Notable mentions in media
Northrop BT-1s appeared in pre-war yellow wing paint schemes in the Technicolor film Dive Bomber (1941) starring Errol Flynn.
References
;Notes
;Bibliography
- Bowers, Peter M. United States Navy Aircraft since 1911. Annapolis, MD: Naval Institute Press, 1990, .
- Brazelton, David. The Douglas SBD Dauntless, Aircraft in Profile 196. Leatherhead, Surrey, UK: Profile Publications Ltd., 1967. No ISBN.
- Drendel, Lou. U.S. Navy Carrier Bombers of World War II. Carrollton, TX: Squadron/Signal Publications, Inc., 1987. .
- Gunston, Bill. The Illustrated History of McDonnell Douglas Aircraft: From Cloudster to Boeing. London: Osprey Publishing, 1999. .
- Kinzey, Bert. SBD Dauntless in Detail & Scale, D&S Vol.48. Carrollton, TX: Squadron/Signal Publications, Inc., 1996. .
- Listemann, Phil. Northrop BT-1 (Allied Wings No.3). France: www.raf-in-combat.com, 2008. .
- Swanborough, Gordon and Peter M. Bowers. United States Navy Aircraft since 1911. London: Putnam, Second edition, 1976. .
References
- Rene J. Francillon (1990 ed), ''McDonnell Douglas Since 1920, Volume I''. Annapolis, Maryland, Naval Institute Press
- [http://www.historyofwar.org/articles/weapons_BT-1.html "Northrop BT-1."] ''historyofwar.org''. Retrieved: 5 December 2009.
- Swanborough and Bowers 1976, p. 358.
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