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What Is A "rolling" Take Off?  
User currently offlineSTEINWAY From , joined Dec 1969, posts, RR:
Posted (13 years 11 months 1 day 15 hours ago) and read 17497 times:

I have this question : What is a "rolling" take off ?
Is it the regular take off procedure or something special? what are the alternatives to a "rolling" TO?

Thanks
Steinway

10 replies: All unread, jump to last
 
User currently offlineOPNLguy From , joined Dec 1969, posts, RR:
Reply 1, posted (13 years 11 months 1 day 15 hours ago) and read 17435 times:

Basically, it's just the taxiing to, and turning onto the end of the takeoff runway, and commencing the the takeoff roll, all in one continuous movement, without stopping. Not an everyday occurence, especially at busier airports, but not a rare event either...

User currently offlineVetteman From , joined Dec 1969, posts, RR:
Reply 2, posted (13 years 11 months 1 day 5 hours ago) and read 17368 times:

That's what I was going to say. All my takeoffs are like that, but then again, I fly a 172... Oh well...

Jeff


User currently offlineMikeybien From , joined Dec 1969, posts, RR:
Reply 3, posted (13 years 11 months 1 day 5 hours ago) and read 17354 times:

as you probably imagined, the alternatives to a "rolling" takeoff involve stopping at the threshold. At that point the aircraft is either throttling up and making a short field takeoff because it does not have the performance to do a rolling takeoff, or it was told by tower to "taxi into postion and hold" and is waiting for traffic to either get off the runway, or waiting for proper takeoff spacing.

User currently offlineAAR90 From United States of America, joined Jan 2000, 3494 posts, RR: 46
Reply 4, posted (13 years 11 months 1 day 4 hours ago) and read 17340 times:

Standard and preferred operation at AA unless airport or conditions warrant otherwise (i.e. SNA).


*NO CARRIER* -- A Naval Aviator's worst nightmare!
User currently offlineL-188 From United States of America, joined Jul 1999, 29832 posts, RR: 58
Reply 5, posted (13 years 11 months 19 hours ago) and read 17316 times:

Preferred option if you are taking off out of a soft field where there is a danger of you sinking into sand, grass, dirt or other surface topping.


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User currently offline767ALLTHEWAY From United States of America, joined Nov 1999, 659 posts, RR: 0
Reply 6, posted (13 years 11 months 17 hours ago) and read 17309 times:

Is it standard op at DL too? Because once at BOS and once at SFO on 757's we did "Rolling Takeoffs"
-767ALLTHEWAY



"Courage is not the absence of fear, but rather the judgement that something else is more important than fear"
User currently offlineSTEINWAY From , joined Dec 1969, posts, RR:
Reply 7, posted (13 years 11 months 13 hours ago) and read 17285 times:


Thanks for your answers, however I still don't understand the sentence where I heard about the rolling take off procedure :

"767 CROSSWIND TAKEOFF TECHNIQUE
For information Boeing recommends a rolling takeoff procedure when crosswind is > 20 kt. Engine surge can occur with a strong crosswind component if takeoff thrust is set prior to brake release." (from smartcockpit web site)

I understand a rolling take off would allow to avoid setting brakes before take off run, thus avoiding possible engine surge setting take off thrust, but could you explain why "Engine surge can occur with a strong crosswind component if takeoff thrust is set prior to brake release"?

Also why isn't it possible, on a crosswind non-rolling TO, to set the brakes at the beginning of the runway, release them and apply takeoff thrust only after.
Do you need to have the brakes set when you first apply takeoff thrust?

Thanks again for your help
Steinway.


User currently offlineMikeybien From , joined Dec 1969, posts, RR:
Reply 8, posted (13 years 11 months 11 hours ago) and read 17268 times:

Ahhh... so that's what you wanted to know.
If an jet is running at full thrust with no forward velocity, it causes a vacuum at the inlet, sucking air into the engine. At a certain speed on the takeoff roll, the ram air becomes great enought that there is no longer a vacuum there. What does this have to do with crosswinds?
With no forward velocity and a heavy crosswind, the air is flowing across the inlet instead of toward it. The vacuum at the inlet changes the direction of the air as it passes by the inlet, and at a high enough crosswind it can cause the air to separate from the inlet and create turbulent flow (i.e. like behind a stalled wing). The turbulent flow is what leads to compressor stalls and surges in the engine.
So if the 767 does a rolling takeoff, by the time the engines are at full thrust the aircraft is already at a high enough speed to "feed" the engine with ram air.
The only other aircraft i know of with this problem is the C-5. Does anybody else know of any?


User currently offlineEg777er From United Kingdom, joined Feb 2000, 1837 posts, RR: 14
Reply 9, posted (13 years 10 months 4 weeks 1 day 18 hours ago) and read 17226 times:

Actually, most of the time at airports such as LHR and BAH they tell aircraft to wait before lining up at the runway threshold and then bring them on for a rolling take-off.

User currently offlineKohflot From , joined Dec 1969, posts, RR:
Reply 10, posted (13 years 10 months 4 weeks 1 day 7 hours ago) and read 17191 times:

AAR -

Rolling TOs are SOP at AA? I guess it makes sense in some ways... but it seems like it'd be too vague. Can you do a rolling TO on a contaminated runway? If not, doesn't it open a gray area for a crew as to whether or not a runway is really contaminated, etc. etc.? Seems like it would just throw something else to think about in the already busy mix right before TO....


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