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Conversion between Lb/Lbf.hr vs Kg/Kgf.hr

stealthflanker

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Greetings.

So yeah, Whenever one look at Jet engine specification, one may usually found SFC or Specific Fuel Consumption in a unit of either Lb/Lbf.hr Or in Russian engine Kg/Kgf.hr. I am curious if these two units actually comparable to each other or one should convert into a more "standard" unit.

E.g Russian AL-31F engine have an SFC of 0.67 Kg/Kgf.hr If i'm using that value in an equation like Breguet range equation, or just want to compare it with US engine with SFC in same condition (flight etc) given in imperial unit e.g 0.7 Lb/Lbf.hr. Can i directly compare the value ? Or if i need to convert, what conversion factor i should use ?

Thank you very much for any response.
 

Dragon029

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Both lb and kg are base 10, and being divided by themselves, so (eg) 0.67kg/(kgf*hr) = 0.67lb/(lbf*hr).
Don't forget too that you can always check conversion factors, etc through things like Wolfram Alpha or Google's built-in calculator and conversion tools.
 
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