Mikoyan-Gurevich MiG-21bis: Difference between revisions

In general the engine of the Mig21-bis is less responsive than that of a modern jet fighter - and throttle and engine management is more subtle.

N1 and N2 are the rotational speeds of the engine sections expressed in percentage instead of in the actual rate of rotation. If N1 gets too much higher than N2, you will cause an engine surge (can happen at as low as 20% separation, it's guaranteed by 30%). Therefore one needs to keep an eye on the N1 and N2 needles and sudden changes in the throttle over a large range are bad. The max N1 to N2 ratio depends on airspeed as well, so you'll have to make sure you don't blow up your engine on a dive. The tachometer r.p.m. gauge is situated on the right side of the front panel in the cockpit - below the radar warning receiver and to the left of the radar screen.

 

On the other hand the air intake cone in the nose is handled by the plane automatically, i.e. without necessary pilot intervention.

 

Second reheat ({{Key press|CTRL-f}}) is only effective below 15,000 feet [https://en.wikipedia.org/wiki/Sea_level mean sea level], and use should be limited to 3 minutes.