PPRuNe Forums - View Single Post - What do you think about this inflight fuel saving technique
Old 21st Aug 2013, 11:30
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enicalyth
 
Join Date: Jul 2004
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for hawk37

Write for the FPPM and FCOM. There are bootleg versions, some brazenly offered on the web. The labourer is worthy of his hire, don’t feed the pirate.

One popular US distributor sells works with an “impressum” endorsed by Boeing itself but with the caveat that the “design” is frozen around 2008 with an engine model that is showing its age. At about $300 honestly acquired I think that’s Okay.

Maximum range occurs when zero-lift drag and induced drag are coincident. Broadly speaking that occurs at 473kts, FL360 ISA and 300 tonnes mass with residual climb >600fpm.

Remembering that force is measured in newtons I have estimated L/D as 2942000/159000 or 18.5 in which case if the instantaneous value of sfc is 0.65 it follows that SAR is 45-44nm/tonne over the range M0.825-0.860
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