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Yak-3 restoration






[YAK-3A at Duxford airfield]
YAK-3A at Duxford airfield.

[YAK-3A in a hangar]
YAK-3A in a hangar.

More YAK-3A photos will be avaible soon.

YAK-3A (Modification of Yak-11 trainer by installation of Allison engine)
The Yak-3A is as far as possible a full scale copy of the Yak-3 fighter developed at the Yakovlev Design Bureau during the Second World War. It is intended to use the aircraft as a flying museum exhibit. Aerodynamicaly Yak-3 and Yak-3A are similar, being single engined, single seat cantilever low wing monoplanes with a cantilever tailplane and retractable undercarriage. The basic structure, control system, undercarriage and some of the equipment were given from Yak-11 wich was a trainer developed from the Yak-3. As the Yak-11 was equipped with an Ash-21 radial engine and tandem cockpit the aircraft was modified to look like the Yak-3 by installing an Allison V-1710-F3R and altering the cockpit structure.

Dimensional Differences

Yak-3A
Yak-3
Length of aircraft, metres
8.825
8.500
Wingspan, metres
9.400
9.200
Wing area, square metres
15.4
14.85
Tail plane span, metres
3.600
3.400


Yaks


Some flight limitations have been predetermined by TsAGI (Central Aerodynamics Research Institute, Moscow) in 1996:
  • Manoeuvring with 6 �g� is permissible at speeds not greater than 500 km/h and take-off weight of ~ 2500 kg.
  • Maximum speed is not greater than 600 km/h.
  • Load factor at speeds 500 < V < 600 km/h not greater than 4�g�.


    Yaks



    MODIFICATIONS

    The following modifications have been carried out on the Yak-11 structure to convert it to Yak-3A (See drawing) :
    1. Modification of the fuselage framework from Yak-11 to Yak-3A incorporating additional strengthening.
    2. Modification of the tandem seat cockpit area in fuselage framework for installation of single seat cockpit.
    3. Installation of retractable tail wheel.
    4. Design and manufacture of engine mount to fit V1710 engine to Yak-3A.
    5. Design and installation of stainless steel firewall.
    6. Installation of V1710 engine including oil and coolant system piping.
    7. Installation of 33D50 propeller.
    8. Installation of oil cooler and coolant entry and variable exit ducting.
    9. Installation of original oil tank.
    10. Modification and strengthening of main spar at centre section to allow for double ducting in place of Yak-11 single duct.
    11. Modification of outer wing to accommodate extra fuel tanks as Yak-3.
    12. Modification of electrical system to use modern generator control components and battery.

    Geometric data and dimensions

    Great take off weight
    2500 kg
    Empty weight
    Crew
    One
    Fuel capacity volume
    450 litres
    Overal legth
    8.825 m
    Wing span
    9.400 m
    Wing area
    15.400 sq.m
    Wing aspect ratio
    5.63
    Wing taper ratio
    3.33
    Mean aerodynamic chord (MAC)
    1.834 m
    Incidence of wing
    0 degrees
    Dihedral of wing
    5.93 degrees
    Ailerons area
    1.06 sq.m
    Aileron aerodynamic balance area
    0.265 sq.m
    Aileron deflection angles (up - down)
    -22, +12 degrees
    Landing flaps area
    1.82 sq.m
    Range of movement of flaps
    50 degrees
    Tailplane area
    2.675 sq.m
    Incidence of tailplane
    0 degree
    Tailplane arm
    4.792 m
    Elevator area
    0.986 sq.m
    Elevator aerodynamic balance area
    0.144 sq.m
    Deflection of elevator (up - down)
    -25, +20 degrees
    Elevator trim tab area
    0.045 sq.m
    Deflection of elevator trim tab
    ± 15 degrees
    Fin area
    1.45 sq.m
    Fin arm
    4.968 m
    Rudder area
    0.72 sq.m
    Rudder aerodynamic balance area
    0.072 sq.m
    Deflection of rudder
    ± 26 degrees
    Wheel track
    3.420 m
    Wheel base
    5.453 m
    Main wheel size
    600 x 180 mm
    Tail wheel size
    255 x 110 mm