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pilot roster db http://159thgar.com/forums/viewtopic.php?f=6&t=19 |
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Author: | 159th_Jester_CO [ Fri Jul 11, 2008 11:40 am ] |
Post subject: | Fuel Economy |
As prescribed by 159th_Archer on the old www.the159th.com: In the interests of actually getting all SW AC recovered without running out of fuel, I conducted a quick test. A 25t was set-up on AP at different alts and speeds, and over a 200km straight course. No load, and fuel load 1510kg. Altitude - Airspeed - Throttle setting - Fuel remaining T1. 300m - 500 - 75% - 650kg T2. 300m - 890 - 90% - 500kg T3. 2000m - 500 - 76% - 740kg T4. 2000m - 790 - 90% - 630kg T5. 4000m - 400 - 82% - 810kg T6. 4000m - 500 - 84% - 890kg T7. 4000m - 660 - 90% - 800kg LOADED (16650kg AUW) T8. 4000m - 400 - 92% - 580kg T9. 4000m - 470 - 95% - 620kg LOADED (19500kg AUW) T10. 1000m - 540 - 90% - 390kg Sorry if the table is not as clear as it might be (and I might have made the odd entry error), but the lesson is pretty clear -and obvious...- height saves fuel as does lower (though NOT slowest) speed. Not dragging an over-loaded AC around is also good. Seems the developers did pretty well, here. T6 is interesting, as at the mid throttle setting it was found fuel ecnomy was better than both the lower/higher settings. |
Author: | 159th_Jester_CO [ Fri Jul 11, 2008 11:43 am ] |
Post subject: | Re: Fuel Economy |
As prescribed by 159th_Invicta on the old www.the159th.com: Here are my findings. All flown with an empty su33 with a full tank of fuel. This first series was flown by setting the throttle to a certain amount. The 33 won't stay airbourne at 75% so I changed that to 85%. At 6000m Alt 85% wasn't enough either, so had to change that to 90%. When flying without the auto-speed hold, the aircraft tends to accelerate or decelarate as the AoA changes. Code: ALT IAS THROTTLE FUEL Remaining 1. 300 810 85% 8400 2. 300 1180 100% 6950 3. 2000 750 85% 8550 4. 2000 1180 85% 8250 5. 6000 700 90% 8650 6. 6000 850 100% 7900 This second batch I used speed hold to fly at a set speed instead of a set throttle setting. Code: ALT IAS THROTTLE FUEL Remaining 7. 6000 360 87% 8450 8. 6000 600 86% 8750 <-- 9. 8000 670 93% 8600 10. 8000 600 90% 8750 <-- To conclude, if you want to save fuel, fly high and fly fast enough to keep your AoA low (<5). I'd recommend option 8. Set altitude hold to 6000 and speedhold at 600. |
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