Sukhoi Su-5
{{Short description|Soviet fighter prototype}}
{{Infobox aircraft
|name=Su-5 (I-107)
|image=Sukhoi Su-5.jpg
|caption=
|type=Fighter
|manufacturer=Sukhoi
|designer=Pavel Sukhoi
|first_flight=6 April 1945
|introduction=
|retired=
|status=Cancelled
|primary_user=
|more_users=
|produced=
|number_built=1
|unit cost=
|variants=
}}
The Sukhoi Su-5 or I-107 was a Soviet mixed-power (propeller and motorjet) prototype fighter aircraft built toward the end of World War II.
Development
The appearance of the German turbojet-powered Messerschmitt Me 262 near the end of World War II prompted the Soviet Union to develop faster fighter aircraft. Since the USSR lacked a production-ready turbojet engine, development efforts were directed toward mixed-power aircraft utilizing a conventional piston engine-driven propeller for the majority of propulsion with a small rocket or jet engine for bursts of speed.{{cite book|author=Shavrov V.B.|year=1994|title=Istoriia konstruktskii samoletov v SSSR, 1938–1950 gg. (3 izd.)|publisher=Mashinostroenie|isbn=5-217-00477-0}}
The Su-5 (initially I-107) and the conceptually similar Mikoyan-Gurevich I-250 were designed in 1944. The aircraft first flew on 6 April 1945 and underwent limited flight testing. It was subsequently fitted with a laminar flow wing and attained 793 km/h (428 kn, 493 mph) at 4,350 m (14,270 ft) with the motorjet functioning.{{cite book|last=Green|first=W|author2=Swanborough, G |year=2001|title=The Great Book of Fighters|publisher=MBI Publishing|isbn=0-7603-1194-3}} On 15 June 1945, the Klimov VK-107A piston engine was damaged beyond repair in flight. Following acquisition of another VK-107A, flight testing continued until 18 October when the engine reached the end of its service life. No further VK-107As could be procured and the project was canceled.{{cite web|url=http://www.sukhoi.org/eng/planes/museum/su5/|title=Sukhoi Su-5|work=Sukhoi Company Museum|access-date=2007-01-14|url-status=dead|archive-url=https://web.archive.org/web/20061118211604/http://www.sukhoi.org/eng/planes/museum/su5/|archive-date=2006-11-18}}
The Su-5 was a conventional monoplane of all-metal construction. The Kholshchevnikov VRDK motorjet in the rear of the fuselage was powered by a driveshaft from the VK-107 piston engine and could provide an additional 100 km/h (54 kn, 62 mph) of speed for three minutes.
Specifications (Su-5)
{{Aircraft specs
| ref = Istoriia konstruktskii samoletov v SSSR, 1938–1950, The Great Book of Fighters, OKB Sukhoi {{cite book |last1=Antonov |first1=Vladimir |last2=Gordon |first2=Yefim |last3=Gordyukov |first3=Nikolai |last4=Yakovlev |first4=Vladimir |last5=Zenkin |first5=Vyacheslav |last6=Carruth |first6=Lenox |last7=Miller |first7=Jay |title=OKB Sukhoi : a history of the design bureau and its aircraft |date=1996 |publisher=Midland Publishing |location=Earl Shilton |isbn=9781857800128 |edition=1st |page=69}}
| prime units? = met
| crew = 1
| length m = 8.51
| length note =
| span m = 10.56
| span note =
| height m =
| height note =
| wing area sqm = 17
| wing area note =
| aspect ratio =
| airfoil = root: TsAGI 1B10 (16.5%) ; tip: NACA 23011{{cite web |last1=Lednicer |first1=David |title=The Incomplete Guide to Airfoil Usage |url=https://m-selig.ae.illinois.edu/ads/aircraft.html |website=m-selig.ae.illinois.edu |access-date=16 April 2019}}
| empty weight kg = 2954
| gross weight kg = 3804
| gross weight note =
| max takeoff weight kg =
| max takeoff weight note =
| fuel capacity =
| more general =
| eng1 number = 1
| eng1 name = Klimov VK-107A
| eng1 type = V-12 liquid-cooled piston engine
| eng1 kw = 1230
| eng1 note = at {{cvt|8300|m}}
| eng2 number = 1
| eng2 name = VRDK
| eng2 type = main-engine driven motorjet booster
| eng2 kn = 2.9
| eng2 note = for 10 minutes (Воздушно-Реактивный Двигатель Компрессорный - Vozdushno-Reaktivny Dvigatel Kompressornyi – air reaction compressor jet)
| prop blade number = 4
| prop name = constant-speed propeller
| prop dia m =
| prop dia note =
| max speed kmh = 793
| max speed note = at {{cvt|4350|m}}
::::{{cvt|810|km/h|mph kn}} at {{cvt|7800|m}}
| cruise speed kmh =
| cruise speed note =
| stall speed kmh =
| stall speed note =
| never exceed speed kmh =
| never exceed speed note =
| range km = 600
| range note =
| combat range km =
| combat range note =
| ferry range km =
| ferry range note =
| endurance =
| ceiling m = 12050
| ceiling note =
| g limits =
| roll rate =
| climb rate ms =
| climb rate note =
| time to altitude = {{cvt|5000|m}} in 5 minutes 42 seconds
| wing loading kg/m2 =
| wing loading note =
| fuel consumption kg/km =
| power/mass =
| thrust/weight =
| more performance =
| guns =
:*1 × 23 mm (0.91 in) Nudelman-Suranov NS-23 cannon with 100 rounds
:*2 × 12.7 mm (0.50 in) Berezin UB machine guns with 200 rpg
| avionics =
}}