|Power at 0m
|Power at ****m
|Weights and loads|
|Wing Load (kg/m2)
|Power load (kg/hp)
||Through the hub|
b/w (42k) Yak-7A from "Russian Civil and Military aircraft 1884~1969"
Book caption calls it Yak-7B, just adding to common confusion...
At the end of
of the factory N°153 underwent serious design revision following reports from the service units and
- Radio receiver RSI-4 "Malutka" and transmitter RSI-3 "Oriol" were installed.
Antennae mast and wires with constant tension system were installed. To guarantee reliable functioning
of the radio-equipment, Yak-7A was "metalized": all metal parts were connected by copper wire
- Tailwheel, made non-retractable in the series trainer
predecessor, got back improved retraction mechanism. Tailwheel well in flight was half-enclosed by
single front cower.
- Additional covers were installed on the main landing gear, opening by springs and closing retracting
wheels via simple lever system.
- Sliding transparent canopy of the rear cockpit was replaced by plywood cover. Rear canopy rails were
deleted because this new cover was opening sidewards, and held in place by a lock controlled from pilot's
- Gun exhaust holes were covered, exhaust gases were released via muzzle openings.
- Gun ammo links collectors were installed. This allowed to reuse chain links and cover links dump holes
for better airdynamics.
- Channels for the machinegun barrels were made narrower.
- Manual engine boost lever was installed to accelerate takeoff
- Fuel tanks neutral gas filling system was modified. CO2 bottle was replaced by engine exhaust.
- Electric fuel gauges removed from instrument panel, replaced by mechanical in the wing. Those gauges were
covered by transparent windows, allowing pilot to control the readings.
- Instrument panel was rearranged and got new illumination system (reflected light instead of scattered by
plexiglas plate). Tailwheel position indicator added.
- Pilot's canopy sliding section got a rear position lock, preventing spontaneous sliding forward when
aircraft is flown with open canopy.
- Intermediate flap position (15°, thought to be helpful for takeoff) was eliminated.
- Seat belts tension system was streamlined.
- Pneumatic cannon reload system was deleted since mechanical one was found sufficient and more reliable.
Color scheme of Yak-7A (Kalininskij Front, Spring
, found on the web...
about Yak-7A drawings
Armament of the Yak-7A was identical to that of
Yak-1 and early Yak-7,
except some improvements in the gun installation.
First production batches of Yak-7A suffered from same quality problems as
Yak-7 M-105PA. Soon production process came to
a steady run, and quality problems were solved. New aircraft was some 20km/h faster
than the predecessor, despite had same engine
and added antenna mast.
Drawing of Yak-7A with identification areas highlighted by me. This is a composite of two drawings
(Yak-7A and Yak-7B by Khaustov published at "Aviation and Time"), produced to match description
of the aircraft at "Yak fighters of the Great Patriotic War period"
During winter season
Yak-7A was built on retractable main skis. Added 73kg of weight and increased drag harmed aircraft
flight performance (as well as a washable white camouflage), but service and operation advantages payed back.
Handling of Yak-7A was not degraded by skis, and landing became much easier.
Joined factory and State trials of the series
Yak-7 N°14-11 (modified to the Yak-7A standadt)were
carried out in February 16 to 22,
at the Factory N°153 test grounds. Aircraft was flown before and after modifications, on wheels and skis.
Flight tests, weapon firing and special skis evaluation were fulfilled: 318 flights (288 for
the ski evaluation alone), 24h4min in the air.
13 Yak-7A were built, in March-May - 264. Despite Yak-7A was still an intermediate design, it proved to be a step
forward. 434thIAP under command
of I.I.Kleschiov destroyed 90 enemy aircraft in June-August
(Stalingrad Front). Yak-7A could sustain severe
combat damage. Pilots managed to bring it back with one aileron lost, with half of rear fuselage and
rudder stripped of fabric skin, half of stabilizer and part of tailfin is gone etc.
Yak-7A underwent another major redesign. More
airdynamic recommendations were implemented, aircraft received new armament - and became Yak-7B.
Images Alert There is a systematic inconsistence in Yak-7A drawings.
For example, drawing from
"Soviet Combat Aircraft of the Second World War"
used here to produce a background is one of the worst.
Many of them have following errors:
- Tailwheel is fixed like on Yak-7 built in
- Tailwheel well is fully enclosed by two sidewards opening covers like Yak-7B
- Rear cockpit glazing of early Yak-7
- Large, flush with the wing surface engine air intakes of Yak-7B