Design of the Yakovlev
Yak-1 medium altitude interceptor fighter began in November 1938, and
from it evolved a series of remarkable aircraft (produced in large
numbers) which made an important mark in history of aviation. Known
initially as the I-26, the type had a wooden wing combined with with a
fuselage of mixed construction and main landing gear units retracting
inwards into the underside of the wing. The I-26 looked a thoroughbred
and was dubbed "Beauty" by its design team.
The Yak-1M flown by Red Guards Major B. N. Yevemen
Flown initially on 13
January 1940, the first prototype was soon lost in a fatal accident,
but the development programme was continued without any break by the
second prototype which incorporated some improvements. A pre-production
batch batch of Yak-1s was flying by the end of the year and 64 initial
series machines had also been completed by then. Changes were
introduced during the course of production and many aircraft of the
main variants were completed from early 1942 with increased wingspan
and a more pointed wing. A new pilots canopy and a cut down rear
fuselage were introduced on the Yak-1B and reduction in overall weight
was achieved with the Yak-1M. The plane of choice for many leading
Soviet fighter pilots, the Yak-1 equipped a high proportion of fighter
'Eskadrilli' from 1942 onwards, when the type was phased out of
production in mid 1943. A total of 8,721 series aircraft of all
versions had been completed.
Originated as an field
modification with an all-round vision cockpit canopy and cut down rear
fuselage decking, accepted officially in July 1942 and in full
production by early 1943. Some planes of this version had a more
incorporated many structurial changes in an effort to reduce weight.
Changes done to the Yak-1B were continued on this version and the
introduction of the Klimov 1,260 hp (940 kw) M-105PF engine resulted in
a new maximum speed of 364 mph (585 km/h) at 12,465 ft (3800 m).
Production started on this version in late 1942. An experimental Yak-1M
was tested in 1942, and eventually became the Yak-3.
aircraft with a wing of reduced span, a two-stage supercharger intended
for high altitude operations. During flight testing in June 1942 these
aircraft achieved a speed of 413 mph (665 km/h) at 32,810 ft (10000 m).
Two prototype aircraft
introducing an all metal version of the I-28 wing and a heavier
armament. One aircraft had a retractable tailwheel.
A small batch of
aircraft which was built in 1943 using a 1,350 hp (1007 kw) M-106
engine with a maximum speed of 379 mph (610 km/h) at 11,810 ft (3600m).
The engine proved troublesome and unreliable and this version was
withdrawn from further service.
Yak-1 late production)
Seat Fighter / Interceptor
Aleksandr Sergeyevich Yakolev
1,050 hp (783 kw) Klimov M-105PA 12-cylinder Vee liquid cooled engine
derived from the Hispano-Suiza 12Y.
Maximum speed 336 mph (540 km/h) at sea level; service ceiling 32,810
ft (10000 m).
Range: 435 miles
(700 km) on internal fuel.
equipped 5,174 lbs (2347 kg) with a maximum take-off weight of 6,276
lbs (2847 kg).
32 ft 9 3/4 in (10.00 m); length 27 ft 9 1/2 in (8.47 m); height 8 ft 8
in (2.64 m); wing area 184.61 sq ft (17.15 sq m).
engine mounted 20 mm ShVAK cannon with 140 rounds and one (sometimes
two) 12.7 mm (0.50 in) Beresin UBS machine guns in the fuselage each
with 348 rounds, plus two 110 lbs or 220 lbs (50 or 100 kg) bombs on
underwing racks. Some aircraft had the addition of underwing rails for
six 25 lbs (12 kg) RS-82 rockets.
(initial designation of the two prototypes), Yak-1 (initial
production), Yak-1B (official modification of a field canopy
modification), Yak-1M (structural changes and the change to a 1,260 hp
(940 kw) M-105PF engine), I-28 (three experimental aircraft), I-30 (two
prototypes), I-33 (small numbers built with the 1,350 hp (1007 kw)