Question about the normal cruise speed of the Mig-21...

[Skulleader]

Hello,

 

I have a question concerning the normal cruise speed of the MiG-21, we must fly to 100% RPM and 800 km/h or 900 km/h or it's better to fly with 80% RPM and 700 Km/h ?

 

In advance a great thanks, Skull.

[QuiGon]

From the manual (p. 84):

Longest range speed: 650-600 km/h IAS (decreases with altitude)

Longest flight duration speed: 480 km/h IAS (doesn’t depend on altitude)

There also is a "speeds conversation table" and a "Altitude/fuel consumption table" there as well :book:

[OverStratos]

As QuiGon said, it depends of what you want.

 

Maximum distance, or maximum endurance?

 

For ferry flight at heights above 5000m you want to maintain IAS = 620km/h

 

That is with two AA missiles and center tank. f/c = 2.7 l/h.