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7071.1 Fuel_flow_scalar settings (Read 6339 times)

asanal Senior Member Offline Posts: 522 Location: Flemington,NJ USA Joined: Jul 9^th, 2009 Gender:	7071.1 Fuel_flow_scalar settings Oct 12^th, 2010 at 6:11pm	Print Post
	707 1. 1 aircraft cfg. fuel_flow scalar=1.45 by CS 464 NM my totat fuel used: 38000 Lbs (???) Average four flights Cruise Fuel/hour used: 20,000Lbs (Fl300) Average IA speed/hour : 300 knots 727-100 aircraft cfg. fuel_flow_ scalar=0.361 (?) setting by CS Is there some thing wrong with 707 1.1 "Fuel_flow scalar" settings


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CoolP Senior Member Offline Posts: 2568 Joined: Jan 17^th, 2010 Gender:	Re: 7071.1 Fuel_flow_scalar settings Reply #1 - Oct 12^th, 2010 at 6:46pm	Print Post
	The worst case scenario at FL290 would be (according to this table) GW 315.000, cruising Alt 29.000, OAT +20 ISA 494 kts : (31,3 : 1000) = 15.783 lbs/hour So the short answer to your question would be "yes" and the longer one "at least unrealistic" if your fuel consumption was observed right. I haven't checked myself so far I must admit. But I doubt that you were flying that heavy and I suggest to measure the average speed in a GS value or to go with mach numbers then. See those shaded numbers there? These are the altitudes to aim for according to your GW. So FL300 is too low for her at every given flyable GW. FL330 to 410 is the range to be recommended. Lets see if this makes a big difference then.


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asanal Senior Member Offline Posts: 522 Location: Flemington,NJ USA Joined: Jul 9^th, 2009 Gender:	Re: 7071.1 Fuel_flow_scalar settings Reply #2 - Oct 12^th, 2010 at 7:13pm	Print Post
	Thanks for your reply. I will make 7 hours test fly and will capture the fuel figures. If my previous figures were right I will not make my destination Frankfurt. Maybe, if I am lucky Keflavik shores.. BTW why much difference between 727 and 707 engine_flow_scalar?


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asanal Senior Member Offline Posts: 522 Location: Flemington,NJ USA Joined: Jul 9^th, 2009 Gender:	Re: 7071.1 Fuel_flow_scalar settings Reply #3 - Oct 12^th, 2010 at 7:15pm	Print Post
	I forgot to say. I will use your chart for this fly.


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TheFinn Full Member Offline Posts: 143 Joined: Aug 7^th, 2007 Gender:	Re: 7071.1 Fuel_flow_scalar settings Reply #4 - Oct 12^th, 2010 at 8:31pm	Print Post
	asanal wrote on Oct 12^th, 2010 at 7:13pm: Thanks for your reply. I will make 7 hours test fly and will capture the fuel figures. If my previous figures were right I will not make �my destination Frankfurt. Maybe, if I am lucky Keflavik �shores.. BTW why �much difference between 727 and 707 engine_flow_scalar? You should be fine for a 7 hour flight. My last one was a 8 hour flight with about 95% fuel, and I had about 20'000lbs left after landing. Fly high and keep the fuel-flow down.


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CoolP Senior Member Offline Posts: 2568 Joined: Jan 17^th, 2010 Gender:	Re: 7071.1 Fuel_flow_scalar settings Reply #5 - Oct 13^th, 2010 at 4:15am	Print Post
	asanal wrote on Oct 12^th, 2010 at 7:15pm: I forgot to say. I will use your chart for this fly. Oh it's not my chart, asanal. Just search for "707perf.zip" at Avsim and find more useful stuff there.


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Markoz CS Team Offline Posts: 12445 Location: Victoria, Australia Joined: Apr 24^th, 2009 Gender:	Re: 7071.1 Fuel_flow_scalar settings Reply #6 - Oct 13^th, 2010 at 6:32am	Print Post
	I did a flight at FL320-FL340 (I didn't have the charts that CoolP mentions) in the 707 from YMML (Melbourne, Australia) - NFFN (Nadi, Fiji). A distance of 2092 nm. It took 5 hours and 50 minutes. I took off with 60% (95906.2 lbs) fuel and landed with 28% (45013.4 lbs) fuel. My speed was ~M0.84. I thought that was pretty good going. Using 32% of fuel to travel 2100 nm gives the 707 a range of more than 6000nm. But... I actually had a pretty strong tail wind that helped a lot and so after taking that into account, I'd say a range of 5500nm should be reasonably close. Mark

	Mark Fletcher PC: i7 10700K @3.8/5.1GHz \| 64GB DDR4 3200 \| 12GB RTX 4070 Super \| 32" LCD Monitor \| 1TB SSD + 2TB SSD + 2TB HDD \| Win 11 Pro
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TheFinn Full Member Offline Posts: 143 Joined: Aug 7^th, 2007 Gender:	Re: 7071.1 Fuel_flow_scalar settings Reply #7 - Oct 13^th, 2010 at 7:34am	Print Post
	Yep, depends on the wind. I had up to 100knots headwind for about 2 hours in my 8 hour flight. Distance was 3800Nm. My speed was also arund 0.84. Maybe with a little less thrust and a speed of 0.80-0.82 you can easily do 4500Nm with full fuel tanks.


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