Developed in parallel with the Yak-23, the similarly-powered Yak-25 was conceptually more advanced and derived from the Yak-19. By comparison with the earlier fighter, the Yak-25 employed the higher-speed TsAGI S-9S-9 laminar section at the wing root translating to a KV-4-9 section at the tip with a constant thickness of 9% throughout. Despite the greater diameter of the 1625kg Rolls-Royce Derwent - similar to that installed in the Yak-23 prototypes - than the RD-10F of the Yak-19, the diameter of the fuselage of the Yak-25 was unchanged. Sweptback horizontal tail surfaces were adopted, provision was made for two 200-litre drop tanks under the wing tips and armament comprised three 23mm NR-23 cannon. The first of two prototypes was flown on 31 October 1947, but, although the subsequent flight test programme was allegedly successful, no production contract was issued for the Yak-25. One of the prototypes was utilised during 1948 for (fixed) tandem-wheel undercarriage trials as part of the Yak-50 development programme.
|A three-view drawing (1660 x 1157)|
| Take-off weight||3235 kg||7132 lb|
| Empty weight||2285 kg||5038 lb|
| Wingspan||8.88 m||29 ft 2 in|
| Length||8.65 m||28 ft 5 in|
| Wing area||14.00 m2||150.69 sq ft|
| Max. speed||972 km/h||604 mph|
| Range||1445 km||898 miles|
tandem-wheel undercarriage trials as part of the Yak-50 development programme.
|hans 2603, 14.06.2011|
hier kann bombardier aber garnicht meckern ,falls er überhaupt ahnung von flugzeugen hat , oder wenigstens etwas geschmack ....
Do you have any comments about this aircraft ?