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Performance data (Read 2425 times)
Ulic
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Performance data
Jan 9th, 2010 at 1:51pm
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Good day,

After buying the FS9 version of the B757 recently I have been reading the manuals and got some questions about manual 4 with performance data.

- Manual 3 lists a maximum takeoff weight of 220000 lbs. Why do the performance tables include values up to 260000 lbs?
- the long range cruise control table lists FF/ENG. I suppose this is fuel flow per engine per hour?
- why are some tables duplicated? e.g. Long range cruise control on pages 16 and 27, holding on pages 18 and 29 and a few more. What's the difference between those tables?
- a slight error in the descent table on page 17, up from pressure alt 31 the values for distance seem to be missing the last digit.
- can anyone explain me what the terms stopway and clearway mean?
- a table is present to calculate the necessary landing distance, is there a way to determine the necessary takeoff distance?

Thanks in advance
  
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lateplaner
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Re: Performance data
Reply #1 - Jan 14th, 2010 at 12:03am
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Ulic,

As a dispatcher who has flight planned 757s, I can tell you that the MTOW diff you refer to is probably because of on engine type. Generally, the P&W engines were higher thrust rating than RR, therefore allowing a higher takeoff weight, although I haven't looked at the tables you have asked about. You may referring to maximum "calculated" takeoff versus maximum "structural". You are right about the FF/Eng per hour.

I have actual 757 takeoff perf charts I could email you.
  
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Ulic
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Re: Performance data
Reply #2 - Jan 16th, 2010 at 6:13pm
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Thanks for the response Lateplaner. I'll send you a message with my email address
  
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