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+--- Thread: Saving fuel and range flying slower? (/showthread.php?tid=8981)
Saving fuel and range flying slower? - Captain_Ricadro - 20-07-2012
Hello anyone, I was flying from Tegel to Sheremetyevo in russia, and was thinking a long time ago in long flights if we could save fuel and
range if we slow down the cursing speed like in A321 flying on M.70-.75 may save anything?
Or it is like the logical way, yet faster you go, so less time you need and more fuel you use. Is it true? or can it yet slower you go, so more time
you need and less fuel you use.
In this case is it possible? I'm now flying in the standard IAE Lufthansa engine, not the puresky engine with bio-fuel, but if I fly make it any
difference?
Regards
Re: Saving fuel and range flying slower? - gbapache - 20-07-2012
In real world flying the number you are looking for is called "Max range airspeed". It is different for different planes
Re: Saving fuel and range flying slower? - timtomairways - 21-07-2012
Its a Trade off. Slowing down is better on gas, but takes longerto get there. SO you will probly burn thesame amount. The good thing about FS is you
can experiment. Try flying the same route twice at diffrent MACHS.
say for example i fly the KATL-KJAX route useing the 757. I use the same route and same weather and same procedurs the entier time. but the first
time i Cruise at Mach .29, next time i cruise at MACH .80 theres probly not much of a diffrence there thoue.
Re: Saving fuel and range flying slower? - Captain_Ricadro - 23-07-2012
Hi Thomas,
Well I can try that but how can I try from New York to Frankfurt? That difference is a lot, I can try to fly on biofuel, like Lufthansa is now updating
they fleet to consume biofuel I can update it to. Well them flying in different speeds isn't so big problem, because the plane consume the
same. But can I save fuel in altitude? likely the 757 in my P.Book fly's in FL350 to 410 in M.80-.86, if I or you fly in FL410 do we save more fuel
then in FL350 at the same speed (M.82 example)?
Thanks for post both of you
Re: Saving fuel and range flying slower? - gbapache - 23-07-2012
If you are useing a weather engine then the best thing to do is find an altitude with the most favorable winds for the direction your flying.
Re: Saving fuel and range flying slower? - timtomairways - 24-07-2012
i would try smaller Flight to get base numbers.
You would burn a bit more gas getting upthere. but Jet engines get better preformance at Higher altitudes. However the also have optimum altitude
Re: Saving fuel and range flying slower? - poden - 26-07-2012
Most planes are more economical when flown at slower speeds. Its just like in a car. Going faster increases air resistance as the square of speed,
but time of flight is reduced only linearly with increased speed. There is quite a bit of variation introduced due to engine designs, airframes, etc,
but most of the time, you'll save fuel by flying slower. Flying at a higher altitude also saves fuel, but again it depends some on the individual
aircraft, and engines.
Re: Saving fuel and range flying slower? - Shaun Patterson - 01-08-2012
Altitude is a major factor here; for instance a CRJ700 travelling at Mach 0.78 (economic cruise speed) at 27,000ft uses around 5-10% more fuel than at Mach 0.78 at 33,000ft. While the indicated
airspeed at a higher height is lower, the ground speed tends to be higher.