Military Factory logo
Icon of F-15 Eagle military combat fighter aircraft
Icon of Abrams Main Battle Tank
Icon of AK-47 assault rifle
Icon of navy warships
Icon of a dollar sign
Icon of military officer saluting

Curtiss O-40 Raven

Two-Seat Light Observation Biplane Aircraft

Curtiss O-40 Raven

Two-Seat Light Observation Biplane Aircraft

OVERVIEW
SPECIFICATIONS
ARMAMENT
VARIANTS
HISTORY
IMAGES
Overview



The Curtiss O-40 Raven biplane aircraft fulfilled the U.S. Army Air Corps role of observation platform during the pre-World War 2 years.
National Flag Graphic
ORIGIN: United States
YEAR: 1933
STATUS: Retired, Out-of-Service
MANUFACTURER(S): Curtiss-Wright Aeroplane Company - USA
PRODUCTION: 5
OPERATORS: United States
National flag of United States
USA
Technical Specifications



Unless otherwise noted the presented statistics below pertain to the Curtiss O-40 Raven model. Common measurements, and their respective conversions, are shown when possible.
CREW: 2
POWER: 1 x Wright R-1820-27 "Cyclone-9" air-cooled radial piston engine developing 670 horsepower and driving a two-bladed propeller unit at the nose.
ADVERTISEMENTS
LENGTH

0
feet
0
meters
WIDTH / SPAN

0
feet
0
meters
HEIGHT

0
feet
0
meters
EMPTY WGT

0
pounds
0
kilograms
M.T.O.W.

0
pounds
0
kilograms
SPEED (MAX)

0
mph
0
kph
0
knots
CEILING

0
feet
0
meters
0
miles
RANGE

0
miles
0
kilometers
0
nautical miles
CLIMB RATE

0
ft/min
0
meters-per-minute
Armament



1 x 0.30 caliber machine gun in fixed, forward-firing mounting.
1 x 0.30 caliber machine gun on trainable mounting in rear observer's cockpit.
Graphical image of an aircraft medium machine gun
Variants / Models



• YO-40 - Prototype model powered by 1 x Wright R-1820E Cyclone engine of 653 horsepower; single example.
• YO-40A - Prototype modified with reinforced wing mainplanes; enclosed cockpit added for the crew spaces; destroyed in 1938.
• Y1O-40B - Monoplane form; powered by Wright R-1820-27 engine developing 670 horsepower; four examples completed.
• O-40B - Redesignation of Y1O-40B developmental form.


History



Detailing the development and operational history of the Curtiss O-40 Raven Two-Seat Light Observation Biplane Aircraft.  Entry last updated on 4/23/2019. Authored by Staff Writer. Content ©www.MilitaryFactory.com.
The O-40 "Raven", offered by American aeroplane-maker Curtiss-Wright, began life as a biplane in its prototype stage. The aircraft was drawn up to fulfill a light-class, over-battlefield observation role for the United States Army Air Corps (USAAC) during the Inter-War period (that is, the period "between the wars"). The aircraft appeared as this single prototype example under the designation of YO-40 (Curtiss company Model 62) and sat a pilot and an observer in inline open-air cockpits (back-to-back) with construction of the aircraft being largely all-metal. Power was from a single Wright R-1820E "Cyclone" engine carried at the nose, driving a two-bladed propeller. A traditional over-under biplane wing arrangement (known as a "Sesquiplane", with the lower wing member considerably shorter than the upper member) was used while the undercarriage was made to be retractable. Of note was slight sweepback given to the upper wing member.

The first-flight of YO-40 was recorded in 1932 but this specimen was involved in a crash that May. The airframe was, for the most part, salvaged and this delay gave engineers the opportunity to enact changes to improve the design. Work resulted in a reinforced, stronger aircraft that now showcased enclosed cockpits for the crew and the changes were substantial enough to warrant the follow-up designation of "YO-40A". Additional work evolved the design even more, resulting in the complete deletion of the lower wing members and making the YO-40 a true monoplane (though it still retained its high-mounted upper wing member). The aircraft was now reborn through the "Y10-40B" line and this version was powered by a Wright R-1820-27 "Cyclone" 9-cylinder, air-cooled radial engine of 670 horsepower. The USAAC saw enough promise in the reworked design to order four examples based on the new standard.

As completed, the aircraft had an overall length of 28.9 feet, a wingspan of 41.7 feet, and a height of 10.7 feet. Empty weight measured 3,755lb against a Maximum Take-Off Weight (MTOW) of 5,180lb. Power from the Wright engine provided the aircraft with a maximum speed of 188 miles-per-hour, a range out to 325 miles, and a service ceiling up to 23,100 feet. Rate-of-climb was reported at 1,660 feet-per-minute.

Lightly armed by the design, the O-40 carried only two medium machine guns: 1 x 0.30 caliber Browning air-cooled machine gun in a fixed, forward-firing mounting (for the pilot) and a 1 x 0.30 caliber Browning air-cooled machine gun on a trainable mounting in the rear cockpit (for the observer and mainly intended for self-defense).

The aircraft were taken into Army service during June of 1933 and carried the formal designation of O-40B "Raven" for their time in the sky. The line served primarily with the 1st Observation Squadron (established March 1913 and, rather amazingly, still existing today as the "1st Reconnaissance Squadron"). Due to their limited inherent range, only these four models were procured by the service and the line was only operated into 1939. The aforementioned salvaged YO-40A prototype, post-revision, was destroyed back in 1938. As such, no Raven aircraft managed to survive by the time of World War 2 (1939-1945).




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.

Image of collection of graph types

Relative Maximum Speed
Hi: 200mph
Lo: 100mph
This entry's maximum listed speed (190mph).

Graph average of 150 miles-per-hour.
City-to-City Ranges
NYC
 
  LDN
LDN
 
  PAR
PAR
 
  BER
BER
 
  MSK
MSK
 
  TKY
TKY
 
  SYD
SYD
 
  LAX
LAX
 
  NYC
Graph showcases the Curtiss O-40 Raven's operational range (on internal fuel) when compared to distances between major cities.
Aviation Era
Pie graph section
Pie graph section
Pie graph section
Pie graph section
Pie graph section
Useful in showcasing the era cross-over of particular aircraft/aerospace designs.
Unit Production (5)
Comm. Market HI*: 44,000 units
Military Market HI**: 36,183 units
5
5

  * Commercial Market High belongs to Cessna 172.

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


Altitude Visualization
Small airplane graphic
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.


Site Disclaimer  |  Privacy Policy  |  Cookies  |  Site Map

www.MilitaryFactory.com. Site content ©2003- MilitaryFactory.com, All Rights Reserved.

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, and WDMMA.org, the World Directory of Modern Military Aircraft.


Facebook Logo YouTube Logo