airbus v speed determination
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airbus v speed determination
I found a very nice PDF file; Getting to grips with aircraft performance.
Please, go to
Getting to Grips With Aircraft Performance
to get the file.
If you go to page 199, looking at the first paragraph, line #3
says
"since v2 is assumed to be fixed,.....".
However, I do not see why the author suddenly assumes v2 as fixed.
any idea?
thanks in advance.
Please, go to
Getting to Grips With Aircraft Performance
to get the file.
If you go to page 199, looking at the first paragraph, line #3
says
"since v2 is assumed to be fixed,.....".
However, I do not see why the author suddenly assumes v2 as fixed.
any idea?
thanks in advance.
Last edited by simyoke; 28th Oct 2016 at 07:46.
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This document was published in Jan 2002. You took quite sometime to find it. Anyway now that you have it will give you good insight into what's it all about.
He is talking about increasing V2/Vs ratio. Since V2 is limited to a maximum value so cannot be increased so in a way fixed at max value and the increase in the ratio can only be affected by reducing Vs.
The lift-off speed, VLOF, is limited by the tire speed (Vtire). As a result, V2 is
limited to a maximum value. Any V2/VS increase is then equivalent to a VS reduction,
since V2 is assumed to be fixed, and thus the tire speed limited takeoff weight is
reduced.
limited to a maximum value. Any V2/VS increase is then equivalent to a VS reduction,
since V2 is assumed to be fixed, and thus the tire speed limited takeoff weight is
reduced.
Last edited by vilas; 28th Oct 2016 at 09:27.
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This document was published in Jan 2002. You took quite sometime to find it. Anyway now that you have it will give you good insight into what's it all about.
He is talking about increasing V2/Vs ratio. Since V2 is limited to a maximum value so cannot be increased so in a way fixed at max value and the increase in the ratio can only be affected by reducing Vs.
He is talking about increasing V2/Vs ratio. Since V2 is limited to a maximum value so cannot be increased so in a way fixed at max value and the increase in the ratio can only be affected by reducing Vs.
He is talking about increasing V2/Vs ratio. Since V2 is limited to a maximum value so cannot be increased so in a way fixed at max value and the increase in the ratio can only be affected by reducing Vs.
I guess I was not desperate enough to read it early enough.
I thought V2 is still variable and the max value(becauese of V tire) is only the upper limit.
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if the pdf file is still at hand....
please go to page 132
the author wrote:
"When CT is fixed and CF increases, it becomes interesting to decrease fuel consumption. Therefore, when CI decreases, Econ Mach decreases."
The above sentence sounds a bit awkward. I even looked up a dictionary for "interesting".
the author wrote:
"When CT is fixed and CF increases, it becomes interesting to decrease fuel consumption. Therefore, when CI decreases, Econ Mach decreases."
The above sentence sounds a bit awkward. I even looked up a dictionary for "interesting".
