ISA vs Altitude
Join Date: Mar 2005
Location: Uh... Where was I?
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"And yet it moves" as Galileo put it.
We were in cruise, very heavy, MAX level, very narrow margin between VLS and VMAX. It took us all the morning to climb there! The N1 and the limit lines all together. The captain tells me to advance the lever. I say "no way", then says go ahead, my responsibility I want to show you something. This dude really knows the airplane, so I say "OK, you do it, it's your ass" (it would be mine, too anyway, but…) So he does and to my surprise, absolutely nothing moves. Not a decimal of N1, nor EGTº, nor N2. Nothing!
Of course, if you do this being light it would be different, I'm just saying that it is possible to fly at an altitude and conditions such that this experiment can be done. Don't do it at home, though!
I was impressed, and tt made me rethink the turbulent penetrating speed. In those conditions accelerating a knot is very difficult, but decelerating 10 is very easy...
We were in cruise, very heavy, MAX level, very narrow margin between VLS and VMAX. It took us all the morning to climb there! The N1 and the limit lines all together. The captain tells me to advance the lever. I say "no way", then says go ahead, my responsibility I want to show you something. This dude really knows the airplane, so I say "OK, you do it, it's your ass" (it would be mine, too anyway, but…) So he does and to my surprise, absolutely nothing moves. Not a decimal of N1, nor EGTº, nor N2. Nothing!
Of course, if you do this being light it would be different, I'm just saying that it is possible to fly at an altitude and conditions such that this experiment can be done. Don't do it at home, though!
I was impressed, and tt made me rethink the turbulent penetrating speed. In those conditions accelerating a knot is very difficult, but decelerating 10 is very easy...
