On 15 March 2014 22:35, Carl Denk wrote: > Agreed with pitot heat comments. > > For those jets at high altitude, the difference between stall speed > (slow where it falls out of the sky) and do not exceed, probably near > full power at the high altitudes is small, and without the proper > airspeed given the pilot and plane's systems, it would be relatively > easy to stall the plane, which goes into a "deep stall", where the > airflow across the tail surfaces is turbulent, and there is insufficient > to generate lift (in the negative direction), to bring the tail up and > nose down to a diving attitude and pick up air speed to regain control. > The forward airspeed quickly diminishes and the plane mushes to the > ground. I am not a pilot, as will be evident. I read an extensive comment on the flight characteristics of the u2 long ago: U2 stall and DNE velocities were stated to effectively merge at high enough altitude - somewhere in the 70,000+ feet range. Unstalled a u2 apparently "just wants to fly" and coaxing it down was apparently a difficult task. Russell --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .