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Additional Information from Internet Encyclopedia

Yak-9: First production version, Klimov M-105PF engine with 880 kW (1,180 hp), 1 × 20 mm ShVAK cannon with 120 rounds and 1 × 12.7 mm UBS machine gun with 200 rounds.

Yak-9 (M-106): Prototype with Klimov M-106-1SK engine with 1,007 kW (1,350 hp), did not advance to production because of problems with the engine.

Yak-9T: Yak-9 armed with a 37 mm Nudelman-Suranov NS-37 cannon with 30 rounds instead of the 20 mm ShVAK, cockpit moved 0.4 m (1 ft 3 in) back to compensate for the heavier nose. Initially poor quality control led to multiple oil and coolant leaks from cannon recoil. Recoil and limited supply of ammunition required accurate aiming and two-three round bursts. Yak-9T was widely used against enemy shipping on the Black Sea and against tanks, but was also successful against aircraft with a single cannon hit usually sufficient to tear apart the target. Time to turn a complete circle: around 21 seconds, however in minimal turbulence the aircraft tends to range from 23-26 second turn circles, but dependent mostly on the aircraft's weight in combat.

Yak-9TK: Yak-9T with the ability to install either the 20 mm ShVAK, the 23 mm VYa, the 37 mm NS-37, or the 45 mm NS-45 cannon in the "vee" of the engine block. Did not enter production because the difference between 20 mm and 23 mm cannon was insignificant and the 45 mm cannon was unreliable.

Yak-9K: Yak-9T modified with a 45 mm NS-45 cannon with 29 rounds and a distinctive muzzle brake to deal with the massive recoil. Firing the cannon at speeds below 350 km/h (220 mph) caused dramatic loss of control and tossed the pilot back and forth in the cockpit; however, accurate shooting was possible at higher speeds and in 2–3 round bursts. The recoil also caused numerous oil and coolant leaks. The heavy cannon installation degraded performance sufficiently to require fighter escort. Yak-9K saw only limited use due to unreliability of the NS-45.

Yak-9D: Long-range version of Yak-9, fuel capacity increased from 440 l (115 US gal) to 650 l (170 US gal) giving a maximum range of 1,360 km (845 mi). Combat usefulness at full range was limited by lack of radio navigation equipment, and a number of aircraft were used as short-range fighters with fuel carried only in inner wing tanks. Circle time: 19–20 sec. Weight of fire: 2 kg (4.4 lb)/sec.

Yak-9TD: Yak-9D with NS-37 cannon and provision for 4 × 50 kg (110 lb) FAB-50 bombs under the wings.

Yak-9B: Fighter-bomber version of Yak-9D (factory designation Yak-9L) with four vertical tube bomb bays aft of the cockpit with capacity for up to 4 × 100 kg (220 lb) FAB-100 bombs or 4 PTAB cassettes with 32 × 1.5 kg (3.3 lb) bomblets each, although normally only 200 kg (440 lb) of weapons were carried in the front bomb bays. Poor handling with a full bomb and fuel load and lack of special aiming equipment limited combat usefulness.

Yak-9DD: Yak-9D and Yak-9T modified to further increase the range, fuel capacity increased to 845 l (220 US gal) giving a maximum range of 2,285 km (1,420 mi), radio navigation equipment for night and poor weather flying. Yak-9DD were used primarily to escort Petlyakov Pe-2 and Tupolev Tu-2 bombers although they proved less than ideal for this role due to insufficient speed advantage over the bombers. In 1944, several Yak-9DD were used to escort B-17 Flying Fortress and B-24 Liberator bombers attacking targets in Romania using the Ukraine-Romania-Italy routes.

Yak-9M: Yak-9D with the cockpit moved 0.4 m (1 ft 4 in) to the rear like on Yak-9T, numerous fixes and improvements based on experience with previous versions.

Yak-9M PVO: Yak-9M with slightly reduced fuel capacity, Klimov VK-105PF2 engine with 925 kW (1,240 hp), and radio and navigational equipment for night and adverse weather flying for PVO Strany.

Yak-9 MPVO: Single-seat night fighter aircraft, equipped with a searchlight and an RPK-10 radio compass.

Yak-9S: Yak-9M with Klimov VK-105PF engine, new propeller, and armament consisting of 1 × 23 mm Nudelman-Suranov NS-23 cannon with 60 rounds, and 2 × 20 mm Berezin B-20 cannons with 120 rpg. Did not enter production due to poor performance compared to Yak-3 and Yak-9U.

Yak-9R: Single-seat tactical reconnaissance aircraft.

Yak-9P: UBS machine gun replaced with a second 20 mm ShVAK with 175 rounds, did not enter production due to the decision to use larger caliber cannons.

Yak-9P (VK-107): Yak-9U with an all-metal wing, Yak-9P in this case was a factory designation different from Yak-9P with two ShVAKs (see above).

Yak-9PD: High-altitude interceptor (unrelated to the two other Yak-9P above) with Klimov M-105PD engine designed specifically to intercept Luftwaffe Junkers Ju 86R high-altitude reconnaissance aircraft overflying Moscow in 1942–1943. Initially poor performance due to unreliable engine dramatically improved with adoption of Klimov M-106PV with water injection, with the aircraft reaching 13,500 m (44,300 ft) during testing. Armament reduced to the ShVAK cannon only to save weight.

Yak-9U (VK-105): Yak-9T with Klimov VK-105PF2 engine and numerous aerodynamic and structural improvements introduced on Yak-3. Main visual difference from Yak-9T was in the oil coolers in the wing roots like on Yak-3 and in plywood covering of the fuselage instead of fabric. Visually differed from Yak-3 only by main landing gear covers. Armament increased to 1 × 23 mm VYa with 60 rounds and 2 × 12.7 mm UBSs with 170 rpg. The VYa cannon could be replaced by a ShVAK, B-20, or NS-37, the latter requiring removal of the starboard UBS machine gun. Did not enter production because the VYa cannon was considered unsatisfactory and because the one cannon, one machine gun armament seen on previous models offered a significant increase in range.

Yak-9U (VK-107): The definitive Yak-9 variant, Yak-9U (VK-105) equipped with the new Klimov VK-107A engine with 1,230 kW (1,650 hp), and the 20 mm ShVAK with 120 rounds replacing the VYa. Weight of fire: 2.72 kg (5.98 lb)/sec. Early test flights in 1943 indicated that the only comparable Soviet fighter was Polikarpov I-185 prototype which was more difficult to fly and less agile due to higher weight. The prototype's top speed of 700 km/h (435 mph) at 5,600 m (18,370 ft) was faster than any other production fighter aircraft in the world at the time. Early problems with overheating were fixed by enlarging the radiators and production aircraft had further improved aerodynamics. Turning ability to complete a circle: 20 sec, best Soviet fighter at altitude.

Yak-9UV: Two-seat trainer version of Yak-9U (VK-107), armament reduced to a single Berezin B-20 cannon with 100 rounds. Did not enter production due to introduction of jet aircraft.

Yak-9UT: Yak-9U (VK-107) armed with 1 × 37 mm Nudelman N-37 cannon with 30 rounds and 2 20 mm Berezin B-20 cannons with 120 rpg, giving a one-second burst mass of 6 kg (13.2 lb). Similarly to Yak-9TK could be converted to replace the N-37 with a 20 mm B-20, 23 mm NS-23, or 45 mm N-45. Production aircraft carried NS-23 instead of the N-37 cannon as the default armament.

Yak-9V: Two-seat trainer version of Yak-9M and Yak-9T, Klimov VK-105PF2 engine, armament reduced to 1 × 20 mm ShVAK with 90 rounds.