Just to copy my post off the LPG’s forum, this is what i got for the fuel consumption of the aircraft.
The rolls royce avon 301r engine of the lightning produces 16360lb of thrust at full reheat and has a specific feul consumption (SFC) of 1.853 lb/lbf (pounds per hour pound). To allow that to make more sense here is a suitable analagy. An engine that produces 1lb of thrust and burns 1lb of feul per hour has an SFC of 1 lb/lbf.
So, back to the most basic of basics. The lightning has 2 engines, totalling 32720lb of thrust.
32720 x 1.853 = 60630.16
Meaning that the lightning is capable of consuming 60630.16lbs of feul in an hour. Now, to break that down.
60630 divided by 60 = 1010.502 to 3 d.p. (decimal places)
1010.502 divided by 60 = 16.842 to 3 d.p.
So, at full reheat on both engines the lightning burns 16.842lbs of feul per second.
Jet feul weighs 6.84lbs per gallon, so finally 16.842 divided by 6.84 and we can now conclude that the true feul consumption of the lightning is approximately 2.464 gallons of feul per second.
Jet A1 costs something in the order 64p a litre at the moment, roughly £2.40 a gallon. Excluding the startup and fuel consumed while the engines are at idle and taxiing power, you’d burn about £75 of fuel in the 12 seconds or so that the aircraft is at full power. For the rest of the run including a static reheat it would total to about £450 worth of fuel being consumed. The only thing left to add into the equation now is the Avpin starter fuel, which is currently around £80 a gallon. If a fast taxi run in the aircraft costs around £600, it makes sense that £100 of that goes back into the aircraft to fund maintenance.
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