{{Infobox aircraft | name = EOI | logo = | logo_size = | image = | alt = | caption = | long_caption = | other_names = | aircraft_type = Fighter | aim = | outcome = | related = | national_origin = USSR | manufacturer = Belyayev | design_group = | designer = Viktor Belyaev | builder = | issuer = | status = | owners = | primary_user = | more_users = | service = | major_applications = | proposals = | prototypes = | number_built = | construction_number = | civil_registration = | military_serial = | radio_code = | requirement = | aircraft_carried = | flights = | total_hours = | total_distance = | construction_date = | introduction = | retired = | first_flight = | initiated = | in_service = | last_flight = | expected = | developed_from = | variants = | developed_into = | preservation = | fate = | predecessors = | successors = | concluded = }}

The '''EOI''' (experimental single-seat fighter) was a fighter aircraft designed and built in the USSR from August 1939.

==Development== Viktor Nikolayevich Belyayev had an illustrious early career with TsAGI, AVIAVnito, Aeroflot, OMOS, AGOS, KOSOS and the Tupolev OKB. He also designed and built several gliders from 1920, including flying wing designs.

Belyayev was authorised to design and build this twin-boom experimental pusher-engined fighter in August 1939. The prototype aircraft and the vast majority of drawings, paperwork and photographs were destroyed in October 1941 during the German invasion. A fighter-dive bomber version of the EOI, called ''PBI'' (dive bomber fighter), was in the planning stages. <!-- ==Variants== -->

==Specifications (EOI) == {{Aircraft specs |ref=<!-- reference -->Gunston, Bill. "Encyclopaedia of Russian Aircraft 1875–1995". London:Osprey. 1995. {{ISBN|1-85532-405-9}} |prime units? = met |crew=1 |span m=11.4 |span ft=37 |span in=5 |wing area sqm=19 |wing area sqft=205 |airfoil =<!-- sailplanes --> max speed |eng1 name= Klimov M-105 (VK-105) |eng1 kw=<!-- prop engines -->783 |eng1 hp=<!-- prop engines -->1,050 }}

==See also== {{aircontent <!-- include as many lines are appropriate. additional lines/entries with carriage return. --> |see also= * Twin-boom aircraft |related=<!-- related developments --> |similar aircraft=<!-- similar or comparable aircraft --> * SAAB J21 * Vultee XP-54 |lists=<!-- related lists --> * List of aircraft }}

==References== {{reflist}} {{refbegin}} * Gunston, Bill. “The Osprey Encyclopaedia of Russian Aircraft 1875 – 1995”. London, Osprey. 1995. {{ISBN|1-85532-405-9}} {{refend}}

Category:1930s Soviet fighter aircraft EOI