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Aug 16 22 tweets 8 min read Read on X
MiG-23 timeline🧵

The development of the MiG-23PD (aircraft 23-01) was decided in a goverment decree issued on 30 April, 1965. Its first flight was with P.M. Ostapenko at the controls, on 3 April, 1967. MiG-23PD (23-01)
Government approval for building the MiG-23 (23-11) aircraft with variable sweep wings, is issued to OKB-155 (MiG) on 28 February, 1966.

The first prototype, 23-11/1 (№ 231), with a R27F-300 engine, is transported for flight testing at Zhukovsky on May 26, 1967. Image
The first flight takes place on 10 June, 1967, with A.V. Fedotov at the controls. Factory test flights are completed in July 1968, and signed by A.I. Mikoyan on 6 November, 1968.

Both aircraft, 23-01 & 23-11, are displayed at the Domodedovo air parade on 9 July, 1967.
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Image
Note: Soviet aircraft have 3 designations. For example:

• design bureau project: type 23-11
• factory product: product 2
• service name: MiG-23

• design bureau project: K-13
• factory product: product 310
• service name: R-3S
Three more prototype aircraft will be built by OKB-155's Moscow Machine-Building Plant "Zenith" (ММЗ "Зинит"). MiG-23 23-11/2 (232) in December 1967, 23-11/3 (233) in June 1968 & 23-11/4 (234) in 1969. Image
At Moscow Machine-Building Plant "Banner of Labour" (ММЗ "Знамя Труда"), 2 a/c were built in 1968, in 1969 - 10. These aircraft were known as MiG-23 model 1969 (образца 1969). In 1970, 26 aircraft, known as MiG-23 model 1970 were built. In 1971, 2 a/c.
MiG-23, model 1969. 23-11, product 2.
MiG-23, model 1970. 23-11, product 2.
The first MiG-23 supplied to operational units (but only for familiarization) was the MiG-23S (23-21 or 23-11S, product 22). First flight 28 May, 1969. A total of 60 were produced in 1969-70, but only 59 were delivered (one aircraft crashed during factory tests in 1970).
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Image
One MiG-23S was also delivered to East Germany as an instructional airframe. Image
MiG-23 model 1971, (23-11, product 2), with Sapfir-23L (323L), ASP-23, TP-23, R27F2M-300 engine. A total of 102 were produced, 98 aircraft were delivered (2 crashed, 2 converted to MiG-23M). MiG-23, model 1971. 23-11, product 2.
MiG-23M (aircraft 23-11М, product 2M). With Sapfir-23D-III, ASP-23D, TP-23 or TP-23-1. The first flight of the MiG-23M was performed by A.V. Fedotov in June 1972, & accepted in service by goverment decree, 9 January 1974. Produced until 1978. Image
MiG-23MS (23-13, product 2MS). With Sapfir-21M (Almaz-23), 179 built between 1974 and 1978. MiG-23MF (23-11MF, product 2MF). 278 aircraft produced between 1978 and 1983 (1st Czechoslovakia). Total MiG-23M (with its export models), production amounted to 1810 aircraft.
MiG-23MS, Libyan Air Force.
MiG-23MF. Romanian Air Force.
MiG-23ML (23-12, product 3) with Sapfir-23ML, ASP-23DTsM, TP-23M. The project was approved by a government decree on 9 January, 1974. On 21 January, 1975, A.G. Fastovets performed the 1st flight on the MiG-23ML. In July 15 1975, the 2nd prototype took to the skies, & ... MiG-23ML prototype.
on November 27, the 3rd. MiG-23M № 3206 was used for testing the R35 engine, & the Sapfir-23ML radar was tested on № 1203. The first stage of joint state tests was completed at the end of 1975. It was launched into production in May 1976, 141 being produced until 1977. MiG-23ML with Sapfir-23ML.
MiG-23ML (23-12, product 3) with Sapfir-23MLA, ASP-17ML, TP-23M. The task was issued in September 1976, the deadline for completing joint state tests was set for September 1977. It went into production in the fourth quarter of 1977. The first delivery in June 1978. Image
Production of MiG-23ML for the Soviet Air Force continued until the end of 1982. Export began in 1981, 1st customer being Czechoslovakia. A total of 321 MiG-23P (23-14) were also built in 1978-1983. MiG-23ML/P were accepted into service by government decree on 18 January 1982. Image
In 1984, 65 export MiG-23MLD (product 23-22A & 23-22B) with Sapfir-23MLAE-2 (N008E) radar were produced for Bulgaria (16 aircraft) & Libya. Libyan MiG-23MLD.
The first 8 Bulgarian aircraft (385, 386, 389, 390, 391, 392, 395 & 396), produced at the beginning of 1984, arrived in Gabrovnitsa in the autumn, the rest (203, 204, 205, 211, 212, 215, 217 & 219) were produced in late 1984, & arrived in early 1985.
The last single-seat fighter MiG-23 was Bulgarian MiG-23MLD c/n 2960327219 (№ 219), manufactured 22 December 1984. During the first years of operation, it was also the aircraft with the most technical problems &, for this reason, with the fewest hours flown. Last MiG-23 fighter manufactured.
№ 219 was sold to Cote d'Ivoire in 2003, together with № 204. Today they are in Togo. Luckily, 217 & 203 found their way into US museums
Image
Image
Luckily, both MiG-23MLD № 203 & № 217 (probably 2nd to last ever produced) have found their ways into US museums.
Image
Image
In total, from 1968 to 1984, 4,256 MiG-23 were produced, of which 3,532 are fighters of various modifications, as well as 624 MiG-23B/BN fighter-bombers. Together with UBs & MiG-27, the total number of MiG-23 and MiG-27 produced exceeded 6,000.
End of thread.

I decided to make this basic🧵about MiG-23 fighter versions in order to give some context, but the numbers posted here are probably imperfect, and just the best that I could find. Main source was this book: Image

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More from @BaA43A3aHY

Aug 4
How fast is the MiG-23? 🧵

Probably the only thing the MiG-23 ever managed to impress with was its speed and acceleration, with the wings swept back the 72° position. Image
Almost every source you can read will tell you that its maximum Mach at high altitude is 2.35... which it is, but only due to a degradation in directional stability and limitations in cockpit canopy material strength. Its true, thrust limited, maximum Mach is quite a bit higher. Image
So let's find out what the MiG-23 can really do.

1▪In "Истребитель МиГ-23 - На защите неба Родины" by Markovsky & Prikhodchenko, we have at page 95, the flight envelope of the MiG-23M, taken from the flight manual. Image
Read 24 tweets
Jul 30
Tumansky R11F-300 vs. General Electric J79 - worlds apart. 🧵

The MiG-21 & F-4 have very different layouts, & their engines are no less dissimilar. Although both engines seem alike, the R11 and J79 were designed with different priorities in mind. Image
The mid 1950s is, for me, one of the most interesting periods in jet engine design. Every desig team was using its own distinct solution of increasing compressor pressure ratio (PR).
Rolls-Royce was using variable inlet guide vanes (VIGVs) & air bleed valves obtaining a PR of 9.1 - 10 with 16 stages in the Avon Mk.301R (Volvo RM6C).

Note: the picture is of a Avon RA.29/1 Mk.524 from the Comet 4, and has a 3-stage turbine, unlike the Mk.301R with 2. Image
Read 19 tweets
Jun 30
MiG-23MS, the worst MiG-23?🧵

Today I'm going to NOT complain about how crappy the MiG-23MS was. Instead, I'm going to tell you two things which it did better than the MiG-23M & MiG-23MF. Image
1 - Internal fuel capacity.

The MiG-23MS had the largest internal fuel capacity of any MiG-23 fighter variant. Since it didn't have the heavy and voluminous Sapfir-23D-III radar of the MiG-23M, a part of the avionics bay behind the cockpit could be used for more fuel. MiG-23ML (23-12B, 1982) avionics bays, used here as an example.
The extra space was used to install fuel tank № 1a, and tank №1 is larger, same as in the MiG-23BN. This meant that the MiG-23MS had 5400 litres of usable internal fuel (again, same as on the MiG-23BN). Total internal fuel is 5626 litres.

Source: jbg37.de/html/triebwerk…
Image
Read 4 tweets
Jun 21
Tumansky vs. Eurojet. Short 🧵

To understand how jet engine technology has evolved from the late 50s up to the late 90s, it's useful to compare engines of similar architectures. A pair that fits this criterion is the Tumansky R13-300 (or R25-300) & the Eurojet EJ200. Image
Why are these engines a useful to compare? As said, because of their similar architecture.
Both have:
- twin-spool (or dual rotor) design,
- 8 compressor stages (3 Low pressure (fan in the case of EJ200) + 5 High pressure), 2 turbine stages (1 LP + 1 HP),
- casing treatments at the 1st compressor stage (axial slots for R13/25, circumferential for the EJ200),
- over-hung 1st compressor/fan stages,
- no variable stator vanes,
- roughly the same class of engine, afterburning, high-speed fighter/interceptor aircraft engines,
Casing treatment comparison. EJ200.
Casing treatment comparison. R25-300.
Read 12 tweets
Mar 31
MiG-23 wing airfoil evolution🧵

While the MiG-23 was going through state evaluations, the movable wing's design was changed, increasing the chord by 10% in order to incorporate a dog-tooth. This also increased the leading edge sweep angles by 2°40'.

Photo: igor113.livejournal Image
This also increased the leading edge sweep angles by 2°40', so for example 45° became 47°40'. The exact reasons for this change are rarely detailed in most books, but test pilot A. A. Shcherbakov mentions it in "Штопор на МиГ-23 - А.А. Щербаков, Авиация и Космонавтика, 2008": Image
This is explained in more detail by military test pilot, Stepan Anastasovich Mikoyan in his memories, "Степан Микоян: Мы - дети войны. Воспоминания военного летчика-испытателя - 2006":
Image
Image
Read 18 tweets

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