Talk:Sukhoi Su-9

First flight

Was 24 June 1956 the date of first flight or first public display? Drutt (talk) 20:56, 18 April 2008 (UTC)

This development history makes no mention of a "T-405", however it mentions a "T-3" prototype which flew on 26 May 1956. What was the T-405? Drutt (talk) 21:35, 18 April 2008 (UTC)

The T-405 was Construction number 405 (i.e. the 5th aircraft of the 4th production batch), which was used for record-breaking in 1960. The paperwork handed to the FAI stated the aircraft to be a T-405Petebutt (talk) 00:49, 19 March 2010 (UTC)

The first flight of the prototype of the Su-9 (T-43-1) was on 10 October 1957. At the time there were several other closely related prototypes floating about but T-43-1 was the first true prototype of the Su-9.

Su-9 and MiG-21

Just wondering, how come the airframe looks almost identical to the MiG-21's? Did they have different mission profiles? Did one of the bureaus come up with the airframe and then license it to the other for modification? Masterblooregard (talk) 03:00, 20 April 2008 (UTC)

According to this article the aerodynamic specifications were determined by the air ministry, not the individual bureaus:

As was the custom in the Soviet aerospace industry, the aerodynamics of the Ye-1 were to be based on concepts suggested by the state Central Aerodynamics & Hydrodynamics Institute (known as TsAGI in its Russian acronym).

Drutt (talk) 18:04, 20 April 2008 (UTC)

The section on distinguishing the Su-9 from the MiG-21 due to the bubble canopy is only partially correct. Early MiG-21s and most of the Chinese derivatives also had a bubble canopy. — Preceding unsigned comment added by 50.92.179.13 (talk) 08:54, 3 February 2013 (UTC)

As can be seen throughout the 1950's and 60's, if you give aircraft designers in separate countries, with no contact, the same specification they will probably design aircraft with very similar characteristics

• • Vickers Vanguard - ilyushin Il-18
  • Vickers VC-10 - Ilyushin Il-62
  • Concorde - TupolevTu-144
  • de Havilland Comet - Tupolev Tu-104
  • North American XB-70 Valkyrie - Sukhoi T-4

The list is endlessPetebutt (talk) 01:01, 19 March 2010 (UTC)

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Incorrect speed

The specifications state that the maximum speed is "2,120 km/h (1,320 mph, 1,140 kn) / M1.73 at 13,000 m". This implies that Mach 1=1225, which is correct at sea level. However, at 13,000 m, it is around 1064 km/h. If the speed in km/h is correct, then the mach number should be 1.99. If the speed in mach number is correct, then the km/h should be 1840 km/h. Unfortunately, I do not have references to confirm either.

Diego bf109 (talk) 01:46, 16 July 2021 (UTC)