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Takeoffs

Mar 06 2007

My dad used to say takeoff was the easiest part of flying: "Go fast. Pull up."

After doing several thousand of them, I agree. The plane's configuration doesn't change (except for retracting the landing gear, which are useless during flight) until it's well away from the ground. Newer, more powerful engines, make the acceleration quicker, and that makes the whole process safer. The faster you get to flying speed, the faster you get airborne. Faster acceleration also means that, in the event the Pilot wants to stop (abort) the takeoff, more runway is left on which to stop.

Those powerful engines allow us to climb out of the low-level bumps brought on by summer heat, and it lets the plane quickly climb above most of the weather ahead. Power is a good thing. You can't have "too much."

The only surprise might be wake turbulence from a jet departing ahead. It can be startling, but it is no threat at all to your plane. Until someone figures out how to see air, wakes will always be out there to surprise us.

Takeoff pitch angle startles some, but the Pilots rotate the aircraft to a very precise climb angle. (We have to rotate to about 20 degrees to avoid placing too much stress on the flaps.)  If you look outside and it seems the plane is slowing down, you have been duped. The perceived slowing of the plane is due to the fact that it is getting farther away from the ground--the only reference you have.  In fact, the plane is speeding up throughout the process. Another reason people think the pitch angle is so steep is because the Otolith organs in your inner ear lie to you under hard acceleration and make you feel like you are going uphill. Upon landing with all the braking that goes on, you feel like you are going downhill. Watch the front of the cabin during takeoff and landing and see if you can catch your balance system fibbing to you.

More about takeoffs:

I don't like the feeling of leaving ground especially when the plane shakes. Some take off's are better than others, why is that?

The plane will shake. Some runways are rough. After takeoff ,the plane shudders and shakes if it is in any wake turbulence from the plane ahead (almost a given at today's busy airports). Your first clue of wake turbulence is when one wing drops sharply and seems to hang there a couple of heartbeats. Nothing to worry about--it's just rough air emanating from each wingtip. Since air can't be seen, Pilots can only guess where the rough air is.

Even if you are in smooth air, you can feel the landing gear turbulence hit the tail as the gear retracts into the fuselage. This turbulence shakes the back of the plane and then disappears as the gear settles into the well located in the wing and belly. Gear turbulence is worse if the Pilot climbs the aircraft steeply, as one often does trying to avoid the wake from the preceding plane.

I don't try to force the rotation of the aircraft, I simply let her fly off by herself. She'll go when she is good and ready. No need to rush her. A slow rotation makes the takeoff very gentle, and other than the forward acceleration, which can be rather brisk, the airplane accelerates away from the ground very gently. Initial climb rates are as high as 6,000 feet per minute. That's over 60mph! If I accelerate the plane and then pitch up steeply, I have accelerated your body to 150 mph across the ground and then started an upward acceleration up of 60 mph. If you aren't gentle, you can make the initial climb after takeoff an unnecessarily rough maneuver, but sometimes, you have no choice, as in trying to avoid wake from the plane that departed right in front of you. However, smoothly rotating lets the plane fly away from the ground genty and with a little extra energy because the speed builds rapidly after liftoff.

Power is a good thing as it gets you away from the ground quickly. No Pilot has ever had a problem hitting air. It is the ground that always wins.

A landing is just a tie.

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Comments

As a FFA (hopefully!!) I found this article very informative! Thank you for this, I always wondered about those "shakes"!

"In the pool"

  • Pamela Kay (not verified) — 03-06-2007 at 03:35 PM

[...] Go fast. Pull up. - Southwest Airlines Captain Ray Stark goes over the ins and outs of takeoffs. His three-word description of a landing is very respectful of gravity. [...]

Back in the '90s there was a plane crash and it had to do with wake turbulence from another airplane. I believe it was the USAIR crash near Pittsburg. They hit some wake turbulence and for whatever reason their controls jammed and they crashed. Is this still a possibility?

USS BLOG BOY
FRANCISCO

  • francisco.delgado (not verified) — 03-06-2007 at 04:15 PM

Hi Francisco,

Like everything else, our knowledge of flying is constantly increasing.

It is only over the last few decades that we have truly started to understand what "happens" behind an aircraft, and what the possible issues may be.

Back in the 90's, Air Traffic Controllers did not have the equipment they have today, which incorporates software that analyses aircraft positions and triggers warnings in case of close proximity.

Today, with a better understanding and better systems, we can ensure better separation between aircraft to ensure that wake turbulence is not a safety of flight issue.
As an industry, we in aviation are constantly learning from other people's mistakes, and building our collective knowledge! this is what makes us the safety industry in the world in relation to transporting people from A to B.

:o)

  • Raphael Sheffield (not verified) — 03-06-2007 at 05:00 PM

Too steep of a rotation can cause your ears to "pop". My family had this problem on Republic 9pre N/W merger not the current one). Since I had tubes I had no problem ;-)

Achoo!
Ding!! boy
Joe Friedmann

  • Joe Friedmann (not verified) — 03-06-2007 at 11:18 PM

I LUV to take off, except when it's time to go home from a trip; that's because I don't want to come home. Anyway, it always gives me an adrenaline rush, as well as flying & landing! :) I wish I could sit in the cockpit during take off, but know I'm not allowed.

  • Leah (not verified) — 03-07-2007 at 12:17 AM

Blog Boy,

If you are in a Cessna and run across a 747 wake and you are low to the ground???

Maybe.

Regarding transport category aircraft? In a word, no.

Different sized transport category aircraft are separated for takeoff and landing. Hitting a "bump" from another plane will still be "exciting" but not dangerous.

Ray

Thanks for an explaination that was easy to understand. It makes me feel better knowing why you do thos things. I'm scared to fly and I'm flying tomorrow to Phoenix with my husband and 5 month old son. I will think of this post when we take off and I hear all those noises and feel all those bumps. I know they can't be avoided, especially taking off from Midway!! Talk about going fast and pulling up. How about straight up like a rocket! :)

  • Amy (not verified) — 03-07-2007 at 03:10 AM

Incidentally, the better and more precise positioning of aircraft today has generated its own problems.

Prior to GPS and the latest generation of inertial systems, when an aircraft was asked to fly a track, it would be on the correct route, with plus or minus up to 5 nautical miles either side, particularly over desertic environments (ie, pacific or atlantic for the greater part!).

With today's aircraft flying precisely the track requested, it has been discovered (particularly over the atlantic, where the airways are used to pretty much full capacity) that it has generated issues of a new kind.

With aircraft flying exactly the same path, and with vertical separation of 2000ft, one aircraft could end up spending a transatlantic crossing in the wake turbulence of an aircraft 200ft higher and slightly ahead! Resulting in a pretty uncomfortable ride for some passengers.

Today, we now have the definition of "offset tracks", allowing airliners to fly a certain distance to the left or right of a given track, in order to be clear of wake turbulence of an aircraft above and in front.

:o)

  • Raphael Sheffield (not verified) — 03-07-2007 at 08:37 AM

I noticed that some landings are smooth and slow and some are bumpy and fast. Is there a certain speed that you guys are supossed to maintain at landing? Do some pilots recieve complaints from passengers for making too many rough landings?

  • Jeramy Brian (not verified) — 03-07-2007 at 01:11 PM

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