Balanced Field Length explained [Accelerated Stop vs Accelerated Go distance, all you need to know]
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- Опубликовано: 30 июн 2024
- The balanced field length is obtained when the Takeoff Distance Required (TODR) and the Accelerated Stop Distance Required are equal.
In order to understand this concept clearly, we need to talk about the Accelerated Stop and the Accelerated Go distance.
The Accelerated Stop Distance is the runway length required by an aircraft to accelerate to a specific speed, usually Vr, and, in case of engine failure at the critical point, to stop within the runway ASDA (Accelerated Stop Distance Available).
The Accelerated Go Distance is the runway length required by an aircraft to accelerate to a specific speed, usually Vr, and, in case of an engine failure at the critical point, also called Vef, to continue the takeoff and reach the end of the runway with a screen height of 35ft for a CAT A aeroplanes on a dry runway. (This screen height is reduced to 15ft on a wet runway).
When the Accelerated Stop and the Accelerated Go distance are equals you have a balanced speed, usually called Balanced V1.
If an engine failure occurs at low speed and you reject the takeoff you will stop the aircraft in a short distance, however, if the same failure occurs and you decide to continue your Accelerated Go distance will be very big since your acceleration is very slow due to the engine failure.
If an engine failure occurs at high speed, however, your Accelerated stop distance will increase substantially and your Accelerated Go distance will be reduced.
There is a point at which these two distances will be equal and this is the balanced V1.
If you want to more about the V1 takeoff speed watch the below video:
• V1 Takeoff Speed - [de...
If you want to know more about the Accelerated Stop Distance Available and the Takeoff Distance Available watch the following RUclips video:
• TORA TODA ASDA LDA Exp...
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Disclaimer:
THIS VIDEO IS FOR ENTERTAINMENT PURPOSES ONLY.
NOT FOR REAL-LIFE OPERATIONS.
PLEASE REFER TO THE OFFICIAL MANUAL AND DOCUMENTATION.
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If you have any question leave a comment below and I will help you!! Happy Landings!!
Really clear and interesting but I still don't understand what is the benefit of a BFL. Thank you for you videos.
Your videos are great! Your explanations are very good, thorough and easy to understand. I like any technical topics you can come up with, personal experiences, the reasons for choosing different procedures. Anything aviation related is interesting! Great work!! Take care and I wish you the best!
You are more than welcome! Many thanks for supporting me with such a great comments!!
Thank you so much for all explainations Gabriel, making ATPL easier. Thank you for sharing your precious knowledges.
You are very welcome!
Awesome and simple explanation. I am getting ready for an interview with an airline and have to brush up on basic concepts etc. This video was very helpful. Thank you for sharing!
That's great!! You are very welcome
Hello Captain! Very well explained! Thankyou very much!!
You are welcome! Have a great day
Thank you very much for the video and for share your experiences and tips!!
I have understood perfectly the concept,and is hepful for studying performance.
You are very welcome! I'm glad to read that you like the video!!
Great video! Thank you
You are very welcome
Excellent. Very professional. Subscribed
Welcome on-board! More content coming.. Don't hesitate to ask me any questions when watching the rest of the videos👍
Nice explanation, thank you captain!
You are very welcome!!
Very helpful video! 👍💯
Glad it helped you!! Thanks for watching
Great explanation. Im having my sittings this period and you really make it clear to me about the Balanced Field Length! Thank you Cpt:)
Hey, I hope you are doing great!!
Many thanks for watching the video, I'm glad to see it helped you out!
Do not hesitate to ask me any question you might have when watching my Videos!
I wish you a great day!
Gabriele
#PILOTCLIMB
@@PILOTCLIMB Can you in one of your videos talk about the limited masses? ( Climb limited- obstacle limited etc) and from what they are affected? Thank you in advance Captain!
@@user-sf4ke8lv2v Hey, many thanks for your comment,
I will make a video about that in the near future, so consider subscribing to the channel, if you haven't already, so you will not miss it when it will be ready.
I wish you a great day
Gabriele
#PILOTCLIMB
Very good. Thank you!
You are very welcome!
Great job describing the portion of take off man!. But try to slow down a bit on the explanation.
Again! Great job! All
Your info is amazing
Hey, I'm glad the content helped you! Many thanks for watching and the feedback
Thanks a lot for your videos, they are great! Nice work, I really appreciate. Do you have any video regarding IRS and INS? best regards from Poland!!
You are very welcome! No I haven't done videos about that topic.. maybe in the future I will.
Thank you so much for your efforts
You are very welcome!!
Your accent is a bit frustrating man but it’s nice to have learned the topic thx 😅
Excellent explanation
Thanks for watching!!
U r the best really 👍
Many thanks for your support
I'm not a pilot, I want to start training for a ppl. I'm 52 years old so I won't be flying the big planes! I'm interested in a 2 seater LSA amphibious. I love aviation so much, I really wish I realized this years ago, I'd be so damn happy doing what you are doing! I really like your videos, I'm glad I found your channel! Best wishes to you, your family and your channel!
That's great! If that is what you want to do go for it! And I hope I can help you to get closer to your dream!! Many thanks for your support!
Thank you very much
Continuing TO at 50 kts is almost impossible unless you had a super long and wide runway. Vmcg would play a role
Hey, Many thanks for watching the video, I hope you are doing great!
You are absolutely correct!!
I made that example in the video because my goal is to make sure that the concept of accelerated stop and go distance is clear!!
As I pointed out in the video You should reject the takeoff if you have an engine failure before V1!
Don't hesitate to comment the rest of the videos with your thoughts!
Take care
Gabriele
Pilotclimb
Great video! Perfectly explained! Thx!
Does the concept for BFL only applies for commercial aircrafts with at least 2 engines?
What about airplanes, like cessna 172 for example, with only 1-engine/prop... in case of an engine failure, there would be no thrust left... therefore continued start wouldn't be possible... but one can still find references for BFL, how is BFL defined in that case(s)?
Hey thanks for the kind comment! BFL is applicable to multiengine aircraft... the single engine planes have not decision speed. The single engine plane normally have an altitude shortly after take off at which if the engine fails the pilot take a specific action, for example 180 degrees turn rather then continue straight. Let me know if you have more questions👍
@@PILOTCLIMB Thx for ur answer! Very appreciated! I indeed have 1 more question. In case of a "normal" start (AEO) does a pilot lift of directly with vLOF or do u wait until u reach v2, even if there is no engine failure?
@@enisfarje9164 You are welcome!! You always rotate at the calculated Vr (rotation speed).
Hi captain, very good explanation. Please, for a more engineering oriented guy, where can i find an explanation of how i can create the asd/tod curves?
You are very welcome! I'm not sure, Check the AFM
Hello, Thanks for making this wonderful explanation Video. I'm also a pilot, but I always have long enough runway for TO and LD, so never concerns about distances. But I really enjoyed learning from your knowledge and experience.
If i may, How different between TODR and AGDR ? I mean, in the real world, what's in use AGDR? Vef is impossible to be set. How can we get the length AGD?
And one more.
How about this, "Balanced Field Length ASD=AGD" I've seen it somewhere else.
Hey, many thanks for watching!! So, in the past, we used tables to calculate the TODR. Normally we use the TODR and not the AGD, these two distances can be identical however sometimes the TODR is more limiting (due to 115% of the distance required from the start of the ground roll to 35feet with all engines operative).
I have seen ASD=AGD as balanced as well, but I recommend using ASDR=TODR for the reason mentioned before.
Let me know if you still have questions👍
thank you for your instructive videos Sir, but my question is WHY? why do we need balanced field or V1 for balanced field? what is that balancing is about?
Hey, many thanks for watching and the comment, the balance V1 is optimal because it gives the balanced field lenght which is the you shortest runway lenght that complies with the safety regulations for take-off. For example, If don't use the balanced V1 your ASDR might be very short however your TORD might go beyond the safety limitation for that particular runway and conditions... VIceversa is also true.
Let me know if you still have any questions.
Good day Sir, Thanks for Your videos
What about clearway? It also can be included in Accelerate Go distance? In that way we will have imbalanced field and V1, because it will be different distances for ASDA and AGDA?!
You are very welcome! You should not take the Clearway into account for your ASDR..
meanwhile the auto generated subtitles: "Accelerated goat distance"
Hey many thanks for watching!! That's funny 🤣... Have a great day!
I will never understand why you only have 14k subscribers and pilot mentour more than 1M 🙄🙄🙄
Many thanks for your great support!!
When we take off after having an engine failure near v1 , we will have Full fuel , Since there is MLW for every aircraft we will have to dump the fuel , for that we may have climb higher and need more time , since we only have one engine power , how it is done Captain ?
Hey, that's a great question !! You have to analyze each situation separately because the situations are different all the times. However, there are some non normal situation that allows you to land with a weight above the MLW...
Captain can u make a video about the relation between flight route ( cruise/ app ) of standard instrument departure route and the traffic controller anther way could air traffic controller change departure route 🤔
It's so confusing to me 😅😅
Hey, Many thanks for your comment!! I will take your suggestion into consideration for a future video!! 👍
Add contaminated runway screen height is 15ft
Thanks for watching!!
Good day Capt when is climb power set
Hey, thanks for watching!! Normally is set at 1500'AGL.
@@PILOTCLIMB love it thanks a lot Capt
Hi there! Since you have practical experience u might help me out?! :)
I'm just doing a numerical simulation for BFL-calculation @ my university for different A/Cs types...For an A320
I got about 2300 m (conf 1+F),
about 2150 m (conf 2)
what confuses me is, with conf 3, BFL becomes slightly more than 2150 m with conf 2,
Is that realistic? I expected BFL to decrease from conf 2 to conf 3 a bit...
Hey, many thanks for watching, the Balanced field length should be the shortest. Is the TORA a limit for the take-off?
@@PILOTCLIMB I've to do the calculations based on the stall speeds/ vR & v2 for given weigjts from the FCOM... with ISA conditions (H=0, density=1.225, etc. ) with different flap configurations... the result should be the min required takeoff length (TOD (AEO) + 15 % or BFL). I was confused, that the result for flaps in conf 3 is slightly higher (due to increased drag...) than for conf 2... have. o recerences to estimate, if thats plausible...
found my error... used vR / v2 for 1000 ft (conf 3) ... thanks for ur time (to answer) and ur great explanation in the vid!
@@enisfarje9164 that's great!! You are welcome!! Don't hesitate to ask me any questions when watching the rest of the videos👍
Hi, I want to ask you why V1 increase leads to TODN-1 and TORN-1 decrease?
Hey, great question, you have to think about what happens to the TOD and TOR with an higher V1 if an engine fails at V1. You will spend most of the TOD and TOR with two engines..
@@PILOTCLIMB thank youuuu
So if we have a balanced V1 it means for sure we have a balanced V1? Also can u speak slower? It’s really fast 😕and hard with the accent
I mean : So if we have a balanced V1 it means for sure we have a balanced field?
Many thanks for watching.. yes, thanks for your feedback
So basically if there is a clearway TODA = TODR??
Thanks for watching, so, TODA is an available distance that is physical and is fixed, the TODR is what you need from brake released to the screen height the TODR might change depending on your performance and the weather. So TODA is the distance you have AVAILABLE for your TODR.
Let me know if I answered your question
Goodness I am sorry but your English is not up to broadcasting.
Many thanks for sharing your opinion. Have a great day!
I am sorry but I don't agree with you Karen.
Captain is doing his best and his English is 100% clear. Good jog Captain. Keep doing your job with love and dedication.
Would You like to speak to the manager,👁👁 Karen?
Very interesting and helpful video to understand Performance subject of ATPL which is driving me mad
That's great! Thanks for watching