Tupolev MTB-1

{{Infobox aircraft

|name=MDR-4 and MTB-1

|image=

|caption=

|type=Patrol flying boat

|manufacturer=Tupolev

|designer=

|first_flight=1934

|introduction=

|retired=1942

|status=

|primary_user=

|more_users=

|produced=

|number_built=15

|variants=

}}

The Tupolev MTB-1 (known originally as the MDR-4 and internally to Tupolev as the ANT-27) was a patrol flying boat built in the Soviet Union in the mid-1930s. It was a refined version of the unsuccessful Chyetverikov MDR-3. The revised design retained the MDR-3's hull, but added a newly designed, full-cantilever wing, a new tail, and a new engine installation featuring two tractor and one pusher unit. Trials began in March 1934 but the prototype was destroyed during one takeoff.

A second prototype was constructed the following year, and redesignated MTB-1 to reflect a new torpedo-carrying role. Despite its poor performance in trials, the aircraft was urgently needed to fill a niche in the Soviet Navy, and it was accepted for production before flight testing was complete. Despite some early structural failures, 15 of these machines were eventually produced and saw service in the Navy for several years, remaining in service until 1942.Gunston, p. 400

Operators

; {{USSR}}

Soviet Naval Aviation

Specifications (MTB-1)

{{Aircraft specs

|ref=The Osprey Encyclopaedia of Russian Aircraft 1875–1995

|prime units?=met

|crew=c. eight

|capacity=

|length m=21.9

|length ft=

|length in=

|length note=

|span m=39.4

|span ft=

|span in=

|span note=

|wing area sqm=

|wing area sqft=177.5

|wing area note=

|airfoil=

|empty weight kg=10521

|empty weight lb=

|empty weight note=

|gross weight kg=16250

|gross weight lb=

|gross weight note=

|max takeoff weight kg=

|max takeoff weight lb=

|max takeoff weight note=

|fuel capacity={{convert|3746|kg|lb|abbr=on}} fuel + {{convert|370|kg|lb|abbr=on}} oil

|more general=

|eng1 number=3

|eng1 name=Mikulin M-34

|eng1 type=V-12 liquid-cooled piston engines

|eng1 kw=

|eng1 hp=800

|eng1 shp=

|eng1 kn=

|eng1 lbf=

|eng1 note=

|power original=

|thrust original=

|eng1 kn-ab=

|eng1 lbf-ab=

|prop blade number=

|prop name=

|prop dia m=

|prop dia ft=

|prop dia in=

|prop dia note=

|max speed kmh=225

|max speed mph=

|max speed kts=

|max speed note=at sea level {{convert|200|km/h|mph kn|abbr=on}} at {{convert|3000|m|ft|abbr=on}}

|max speed mach=

|cruise speed kmh=

|cruise speed mph=

|cruise speed kts=

|cruise speed note=

|stall speed kmh=

|stall speed mph=

|stall speed kts=

|stall speed note=

|never exceed speed kmh=

|never exceed speed mph=

|never exceed speed kts=

|never exceed speed note=

|minimum control speed kmh=

|minimum control speed mph=

|minimum control speed kts=

|minimum control speed note=

|range km=2000

|range miles=

|range nmi=

|range note=

|combat range km=

|combat range miles=

|combat range nmi=

|combat range note=

|ferry range km=

|ferry range miles=

|ferry range nmi=

|ferry range note=

|endurance=11 hours

|ceiling m=4470

|ceiling ft=

|ceiling note=

|g limits=

|roll rate=

|glide ratio=

|climb rate ms=3.1

|climb rate ftmin=

|climb rate note=

|time to altitude={{convert|1000|m|ft|abbr=on}} 5.4 minutes

|sink rate ms=

|sink rate ftmin=

|sink rate note=

|lift to drag=

|wing loading kg/m2=

|wing loading lb/sqft=

|wing loading note=

|disk loading kg/m2=

|disk loading lb/sqft=

|disk loading note=

|fuel consumption kg/km=

|fuel consumption lb/mi=

|power/mass=

|thrust/weight=

|more performance=

|guns= {{bulleted list

|1x {{convert|20|mm|in|abbr=on|3}} Oerlikon cannon in a Tur-9 dorsal turret

|4x {{convert|7.62|mm|in|abbr=on|3}} ShKAS machine-guns in twin mountings nose and tail

}}

|bombs= {{convert|500|kg|lb|abbr=on}}

|rockets=

|missiles=

|hardpoints=

|hardpoint capacity=

|hardpoint rockets=

|hardpoint missiles=

|hardpoint bombs=

|hardpoint other=

|avionics=

}}

Notes

Bibliography

{{cite book|last1=Gordon|first1=Yefim|last2=Rigamant|first2=Vladimir |title=OKB Tupolev: A History of the Design Bureau and its Aircraft|publisher=Midland Publishing|location=Hinckley, England|year=2005|isbn=1-85780-214-4|name-list-style=amp}}
{{cite book|last=Gunston|first=Bill|title=The Osprey Encyclopedia of Russian Aircraft 1875–1995|publisher=Osprey|location=London|year=1995a|isbn=1-85532-405-9|author-link=Bill Gunston}}
{{cite book|last=Gunston|first=Bill|title=Tupolev Aircraft since 1922|publisher=Naval Institute Press|location=Annapolis, Maryland|year=1995b|isbn=1-55750-882-8}}

Tupolev MTB-1

Operators

Specifications (MTB-1)

Notes

Bibliography

Further reading