|Function||Series Fighter with modifications|
|Power at ...|
|Weights and loads|
|Wing Load (kg/m2)||168||167|
|Power load (kg/hp)||2.40||2.40|
|Turn time (sec)||18||19|
|during combat turn||900m||1150m|
|Gun Type||1*20mm ShVAK|
|Position||Through the hub|
|Gun Type||1*12.7mm UBS|
|Bombs||see Yak-1 with bombs|
|Rockets||see Yak-1 with rockets|
Efforts of the A.S.Yakovlev OKB aimed on the Yak-1 airdynamic refinement continued through all the production period. Normally, this work was performed on the team initiative and gradually introduced on the production lines.
But few cases really stay out of those regular efforts.
During Summer and Fall of the 1942 during Stalingrad Battle air combat situation for Soviet Army worsened: Luftwaffe put into action new Bf-109F-4 and Bf-109G-2 with more powerful engines. Those Messerschmitts had substantial advantage over series Yaks in climb and maneuverability and some in speed (specially when 3min boost system was engaged).
Following major efforts were undertaken by A.S.Yakovlev OKB:
In October 1942 series built Yak-1 N°16-99 was flown before and after airdynamic improvements. Trials took place at LII by test-pilot V.N.Kochenuk (from Factory N°292) and engineer V.Ya.Molchanov (LII). Results were positive - performance of improved Yak matched demands of VVS.
As a part of research program influence of different factors on the aircraft speed were studied:
Production lines quickly adopted required changes in construction. One year later (October-September 1943) another series built Yak-1 N°23-148 was taken through same procedure: flight test program, refinement of the plane, and another flight test. This time only minor gain was achieved in aircraft speed (~5km/h), proving that aircraft manufacturers used all reserves of the Yak-1 improvement. Technological process finally reached its perfection. Speed variation among series Yaks also was within +/-5km/h interval.
'Clean' series Yak-1 was superior to the Bf-109G-2 in all respects up to 5000m. On higher altitudes 'Messer' gained speed advantage (up to 96km/h at 7000m). This advantage was not that crucial - Yak's maneuverability and handling remained superior up to 8000m, and high altitude air combat was not typical for the East Front.
|Created July 29, 2000||Back to|