Long-Range Flight Planning

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decaff_42
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Long-Range Flight Planning

Post by decaff_42 » Tue Feb 03, 2015 12:03 am

I am looking for some help in gathering fuel consumption data for YSFlight, with the eventual goal of determining optimum cruise speed for long-range flights. The idea here is to take a scientific approach in order to to determine how fuel is burned.

Procedure:
Use a stock aircraft (ex F-22) on a stock map with 5% fuel load.
Start from a runway position with initial speed 0 knots.
Set brake.
Quickly advance throttles to particular test value and start a timer.
When all the fuel is burned up, stop the timer and record the data.

Information to Report:
• Aircraft used
• Military and Afterburner Fuel consumption numbers (From DAT File)
• Throttle Setting (%)
• Time to empty tanks.
• Fuel Capacity of aircraft (From DAT File)
• Afterburner used (Y/N)


Submit Data Here!

Goals:
• Obtain an equation to relate throttle setting and military/afterburner fuel consumption to time-to-empty-tanks.
• Create Spreadsheet to calculate maximum range for a given aircraft.

Notes
1) The default throttle advancement is 5%, but can be changed to 2.5%
2) The afterburner is only available from approximately 60% throttle and up. When recording this data, simply indicate over-all throttle setting and if you used an afterburner.
3) I would like to test a variety of stock aircraft to help gain statistical confidence.
4) Multiple tests of the same aircraft at the same throttle setting helps build statistical model and is helpful to the cause.

I appreciate all of your help in exploring this aspect of YSFlight! Hopefully with this information we can explore precision, long-range flights!


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Long-Range Flight Planning

Post by Gunny » Tue Feb 03, 2015 12:51 am

I like the way you think decaff.I have been doing this on and off for a while now.editing .dat specs for aircraft I often fly.Translating metric to imperial for ease of calculations for me anyway.Vary often there is fuel consumption data available on line for specific airplanes and I believe airline manufacturers have those stats published.But a standardization chart would be a great help to modders attempting to add a little more authenticity to flight planning for there airplanes with accurate weight & balance planning possible as well.I am sure combat pilots would love the added challenge of planning there missions around there realistic fuel capacity's[Tongue firmly in cheek he said.]and weight & balance for ordnance load outs. ;)
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Long-Range Flight Planning

Post by Mobiyus » Tue Feb 03, 2015 1:11 am

This I can do. Will help ya gather info :)
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Long-Range Flight Planning

Post by Mobiyus » Tue Feb 03, 2015 3:52 am

Just sent a first report about the B747, but the google form forces us to select a AB unit value and AB thrust value above 1, when in this case it doesnt have any AB, so I entered 1. Other tests coming in for the F-18E_SUPERHORNET.
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Long-Range Flight Planning

Post by decaff_42 » Tue Feb 03, 2015 3:54 am

Okay good point about that. I think if you just enter 0 then it should be okay. As long as you indicate that there was not an AB used during the test it should not matter in any event.

Also if you could stick to one aircraft for several tests that would be most helpful. What would be idea is 2-3 tests for each aircraft for each throttle setting. This nets 30 data points for 3 aircraft.

I just did a 50% throttle dry thrust test on the F-22 which took 30 minutes. My next would be 55, 60, 65, etc. Then when I had more time I would work my way down to 5% throttle. That test might take hours to do thou.
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Post by Mobiyus » Tue Feb 03, 2015 4:19 am

Ok will see if entering 0 works next time.

You will be happy to see I just submitted 8 or 10 F-18E_SUPERHORNET's tests. 90% and 100% throttle with and without AB.

Cheers! I'll do some more later
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Long-Range Flight Planning

Post by decaff_42 » Tue Feb 03, 2015 6:15 am

I will accept any and all data! :D That being said...

It may be that all the aircraft are governed by the same equations. Switching between aircraft might only vary the fuel volume and other engine-specific data. The more data on one particular aircraft, the better picture we will get as it will reduce the number of variables that have to be verified.

There is a well-repeated mantra in math and engineering. You need as many equations as you have unknown variables to solve a system of equations. The fewer variables overall, the fewer equations and easier it will be to tease the governing equations from the data.

I humbly request that you stick to one aircraft, preferably with a low internal fuel load to start off with in order to decrease the time it takes to run thru a test. It may end up that with the lower throttle settings that we only need to time 1% fuel burn. Even that could take several hours. :?
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