I_4Got_My_Name From , joined Dec 1969, posts, RR: Posted (13 years 4 months 1 week 4 days ago) and read 875 times:
Could Someone Please Explain Why On Some Days The Planes Comming Out Sky Harbor Heading North Are Very High Up & Days Like Today The Almost Seem To Hug The Ground Becuase When They Fly Over I Could Tell You What That Plane Is/Was. I Live About 45 Min Away From The Airport By Freeway With No Traffic So Don't Think I Live Near The Airport.
N766AS From , joined Dec 1969, posts, RR: Reply 1, posted (13 years 4 months 1 week 3 days 23 hours ago) and read 754 times:
A simple explanation could be that ATC instructs them to stay low, but another reason may be because of current weather conditions. Temperature and pressure differences can make it harder for a plane to ascend. Someone else on this board may be able to give a more detailed explanation.
Airgypsy From United States of America, joined Nov 1999, 130 posts, RR: 2 Reply 2, posted (13 years 4 months 1 week 3 days 6 hours ago) and read 716 times:
N766AS is exactly right about the weather. As the air heats up it expands and this makes for less air molecules per volume of air to create lift. That's the same as raising the elevation of the airport several thousand feet on a warm day. High altitude runways are VERY LONG because of this effect. Not only is lift performance affected but engine performance as well. Drag does decrease slightly but not enough to be an offset.
I leaned to fly in the Mojave Desert and I flew at the crack of dawn to get the cool air advantage. Climb performances were 500-600 ft per min in the morning and 150-250 ft per min by mid day in the Piper I flew.
So, Be Cool!