×
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
X-PLANE

Moskalev SAM-7 (Sigma)


Twin-Seat, Single-Engine Fighter Prototype (1936)


Aviation / Aerospace

1 / 1
Image copyright www.MilitaryFactory.com; No Reproduction Permitted.

Jump-to: Specifications

The Moskalev SAM-7 never fulfilled its potential in testing - largely due to an unproven and wholly unique design arrangement.



Authored By: Staff Writer | Last Edited: 04/26/2021 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.
By mid-1930s aircraft standards, the Moskalev SAM-7 "Sigma" was a wholly unique, two-seat, single-engine "tailless" fighter proposal of the World War 2-era (1939-1945) to emerge from the Soviet Union Appearing in 1936, the aircraft never saw service as a production aircraft. Such experiments proved common for all major participants of the Second World War with many such designs never seeing the light of day, let along functional prototypes. Design of this aircraft is attributed to Alexsandr A. Moskalev.

The aircraft incorporated a mid-set monoplane arrangement with full-length slotted flaps were to act as elevators and ailerons to handle pitch, roll, and elevation controls. The wing mainplanes were fitted to the sides of the fuselage in typical fashion and given a tapered shape from fuselage to the wingtips. Furthermore, the wingtips were capped by oversized, rounded fins. The pilot sat in his usual place near midships with the engine mounted direct forward, this used to drive a four-bladed wooden propeller unit. Construction was of all-metal including metal skinning of aluminum alloy. The undercarriage was of a "tail dragger" arrangement incorporating two main (wheeled) legs under the wings and a simple tail skid aft. The main legs retracted (by means of a manual mechanism) into the wings towards the fuselage centerline while the tail skid was fixed.

Power was from a single Mikulin M-34 series V12 liquid-cooled piston engine of 750 horsepower which drove the propeller unit at the nose. This same mass-production engine (over 10,500 individual units produced from 1934 to 1943) powered such types as the Tupolev TB-3 and TB-4, the Petlyakov Pe-8, and the Kalinin K-7.

The aircraft's wingspan reached 9.6 meters with an overall fuselage length of 7 meters. Empty weight was 1,000kg against an MTOW of 1,500kg.

Proposed armament was 2 x 7.62mm ShKAS machine guns synchronized to fire through the spinning propeller blades while the rear cockpit was managed by the dedicated rear gunner who had access to 2 x 7.62mm ShKAS machine guns. In this way, the aircraft could attack both aerial and land-based targets while being actively defensed from the rear.

The SAM-7 saw only limited testing and quickly found to be an inherently unstable design - no surprise considering the departure from the aircraft design norms of the time. Instead, the Soviet aeronautic focus remained on more conventional, traditional fighter designs for the foreseeable future.

Captured performance specs included a maximum speed of 500 kmh, range of 800 kilometers, and a service ceiling of 9,200 meters.

Specifications



Service Year
1936

Origin
Soviet Union national flag graphic
Soviet Union

Status
CANCELLED
Development Ended.
Crew
3

Production
1
UNITS


Moskalev UN31 / Plant 18 - Soviet Union
National flag of the Soviet Union Soviet Union (cancelled)
(OPERATORS list includes past, present, and future operators when applicable)
Air-to-Air Combat, Fighter
General ability to actively engage other aircraft of similar form and function, typically through guns, missiles, and/or aerial rockets.
X-Plane (Developmental, Prototype, Technology Demonstrator)
Aircraft developed for the role of prototyping, technology demonstration, or research / data collection.


Length
23.0 ft
(7.00 m)
Width/Span
31.5 ft
(9.60 m)
Empty Wgt
2,205 lb
(1,000 kg)
MTOW
3,307 lb
(1,500 kg)
Wgt Diff
+1,102 lb
(+500 kg)
(Showcased structural values pertain to the Moskalev SAM-7 production variant)
Installed: 1 x Mikulin M-34 V-12 liquid-cooled inline piston engine developing 750 horsepower and driving a four-bladed propeller unit at the nose.
Max Speed
311 mph
(500 kph | 270 kts)
Ceiling
30,184 ft
(9,200 m | 6 mi)
Range
497 mi
(800 km | 1,482 nm)


♦ 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 Moskalev SAM-7 production variant. Compare this aircraft entry against any other in our database. View aircraft by powerplant type)
PROPOSED:
2 x 7.76mm ShKAS machine guns in fixed, forward-firing mounts over the nose synchronized to fire through the spinning propeller blades.
2 x 7.62mm ShKAS machine guns paired in a trainable, rear-facing gun position at the aft-section of the fuselage.


Supported Types


Graphical image of an aircraft medium machine gun


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


SAM-7 - Base Project Designation; single prototype completed and lightly tested.


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.

Advertisements





Disclaimer | Privacy Policy | Cookies


2022 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-