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Old 06-13-2019, 08:47 AM   #11
sLYFa
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There is also a best roc schedule furhter down and an AB climb schedule in the mission planning section.
Edit: Apparently, the best roc section is only present in the -B manual. But from an aerodynamic point of view, there is always best roc climb and best fuel economy climb, no matter if its a cessna or a B747.
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Old 06-13-2019, 09:06 AM   #12
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Originally Posted by sLYFa View Post
.. there is always best roc climb and best fuel economy climb, no matter if its a cessna or a B747.
That's new to me. Especially on a jet which uses a lot more fuel at lower altitudes. So the max ROC results in the best fuel economy as well or am I wrong?
Not aware that there are different climb tables e.g. in a C152.
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Old 06-13-2019, 09:52 AM   #13
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So the max ROC results in the best fuel economy as well or am I wrong?
Not aware that there are different climb tables e.g. in a C152.
Probably yes but not neccessarily. It depends on the indivdual aircraft. For the F-14, there appears to be some difference. I remember the Tu-154 also had two climb schedules, one for economy and one for fastest climb.

In GA aircraft, the tables often boil down to a single value.
There is also a max climb angle speed, but its probably not that relevant for fighters.
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Old 06-13-2019, 10:12 AM   #14
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There is also a max climb angle speed, but its probably not that relevant for fighters.
On many airliners, e.g. the DC-9 Vx and Vy are basically identical and hence Vx is not used. That's why there's on jets usually only a single optimum climb speed.
Again, for the F-14A, the F-15 etc. there's apparently also only one single optimum climb speed.

Since the Tu-154 isn't exactly a fuel efficient airplane I can imagine that there's a separate 'econ' climb

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Old 06-13-2019, 10:18 AM   #15
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in mil jets manuals... military power climb is tabulated for fuel efficiency, while max AB climb is minimum time.
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Old 06-13-2019, 10:44 AM   #16
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in mil jets manuals... military power climb is tabulated for fuel efficiency, while max AB climb is minimum time.
Well that's obvious The original discussion was, why the F-15 uses the same, rather low IAS for mil and AB climb, while there's usually a big difference for most other planes.
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Old 06-13-2019, 01:04 PM   #17
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What you mean is that there are no other schedules that you have seen.

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Hm, I don't think so. The F-15 and the F-5E both have a single fixed climb speed schedule for MAX power, there are no other speeds/climb schedules available for different circumstances.
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Old 06-13-2019, 01:31 PM   #18
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What you mean is that there are no other schedules that you have seen.
I doubt that any pilot would use speed schedules that aren't written in the -1 / flight manuals.
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Old 06-13-2019, 01:39 PM   #19
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You mean you don't believe there are schedules that you haven't seen

The -1 gives you pretty much most of the basics. They're basics.
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Old 06-13-2019, 01:50 PM   #20
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You mean you don't believe there are schedules that you haven't seen
The -1 gives you pretty much most of the basics. They're basics.
This has nothing to do with what I believe. Most likely test pilots have done quite a few other climb tests, but I'm not aware of other 'secret' performance manuals e.g. F-15 pilots get?
Why would MCD and/or the USAF hide optimum performance data from their manuals, or not include them in the -1?

Thinking of it, since it's (now) Boeing in case of the F-15, it might be the same case as with MCAS. It's there but they are not going to tell you or mention it in the -1

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