reply to post by OrionStars
I will continue with another aspect of your post, regarding a 'hairpin' turn. No, airliners cannot execute a 'hairpin' turn. Not even sure why
you mentioned this, I am having trouble following your logic...
If you go out to learn to fly, you will, in the US, get a 'Private Pilot' license. If you wish to further your knowledge, you may wish to get an
'Instrument Rating'. There, you will learn about the 'Standard Rate Turn'. The 'Standard Rate' is also called the '2-minute' turn...what it
means is, at that rate, an airplane will complete 360 degrees of turn in 2 minutes. That, of course, works out to 3 degrees of heading change per
second. This is what ATC expects of an airplane, when it is operating in an IFR environment, meaning, under IFR rules.
In a light airplane, traveling at about 150 knots, a 30 degree bank will be close to 'Standard Rate'. BTW, when learning to fly on instruments it
is important to maintain control, and to not exceed parameters that could lead to vertigo, and subsequent loss of control of the airplane. In fact,
vertigo can occur even in level flight, depending on the individual...a sharp turn of the head, for instance...
Rate-of-turn is variable depending on airspeed, at any fixed angle of bank. The controllers know this, and they understand that a B767, for instance,
at 250Knots (max speed below 10,000 feet, per FAA regs) will bank at 25 degrees. This WILL NOT result in a 'Standard Rate' turn, of course. As an
airliner is vectored in the terminal area, the controller will command speed changes as he 'jockeys' each airplane in his sector, and lines them up
for the Final.
A modern jet has minimum safe airspeeds, depending on weight and configuration. A B767, clean, will have a minimum of around 210 to 200 knots in the
landing phase. When told to reduce to a speed of, say, 180K, we have to begin to extend slats and flaps. This is just info to, hopefully, educate
those who don't fully understand the complexeties of airplanes...
BTW, a B767-200 just after take-off, at near MGTOW, will have a minimum clean airspeed of about 240 to 245 knots. Some heavier commercial jets (the
B747 comes to mind...) can have a minimum clean airspeed of MORE THAN 250Knots...in those cases, they are allowed to exceed the 250K max airspeed rule
below 10,000 feet.
Well, thanks for reading, hope I've educated someone....
Adding from edit...sheesh!! I should get paid for this! I am giving it out for free...oh, well....
[edit on 7-2-2008 by weedwhacker]