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Thrust Needed to Taxi (Read 4786 times)

EdwardS Full Member Offline Posts: 63 Joined: Jul 5^th, 2010	Thrust Needed to Taxi Feb 23^rd, 2012 at 4:02am	Print Post
	I removed then installed my FSX onto a SSD to explore the capabilities of it verses a VelociRaptor. When I went to make the first, and subsequent flight, I noticed that it required around 40% to 50% thrust to taxi at a weight of around 194,000. With the prior instillation it only need to apply about 25% to 30% thrust to taxi. Does it sound like the CS 727 installed incorrectly? I should also mention this is the only plane that is demonstrating this and I did update the static thrust to 17,400.


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windplayer Senior Member Offline Posts: 568 Location: Izhevsk, Udmurtia, Russia Joined: Aug 5^th, 2011 Gender:	Re: Thrust Needed to Taxi Reply #1 - Feb 23^rd, 2012 at 8:50am	Print Post
	you talking about 727-200 i guess. break-away thrust can be up to 40%N1 i think. but taxi thrust should be less. But it depends on paving. you will require more power to taxi on gravel taxiway then for concrete. but i really think you can try to reinstall 727. P.S. check emergency brake lever and pressure. maybe you applied some accidentally. Also brake press indicator show only left main gear press. it doesnt show right main gear brake. if your right pedal pressed a little - you wont see it.


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NNewcomb Senior Member Offline 757-200, 767-300, 727-100, 727-200, 727F, 737-200 Posts: 604 Location: United States Joined: Jun 29^th, 2010 Gender:	Re: Thrust Needed to Taxi Reply #2 - Feb 23^rd, 2012 at 1:02pm	Print Post
	EdwardS wrote on Feb 23^rd, 2012 at 4:02am: I removed then installed my FSX onto a SSD to explore the capabilities of it verses a VelociRaptor. When I went to make the first, and subsequent flight, I noticed that it required around 40% to 50% thrust to taxi at a weight of around 194,000. With the prior instillation it only need to apply about 25% to 30% thrust to taxi. Does it sound like the CS 727 installed incorrectly? I should also mention this is the only plane that is demonstrating this and I did update the static thrust to 17,400. The CS 727 has weak thrust. You can change it is the aircraft.cfg folder from 15500 over 17400. [TurbineEngineData] fuel_flow_gain= 0.003 inlet_area= 18.000 rated_N2_rpm= 29920.000 static_thrust=17400 //15500 afterburner_available= 0 reverser_available= 1 ThrustSpecificFuelConsumption = 1 AfterBurnThrustSpecificFuelConsumption = 0 I did this for all the 727 models.

	�Nick&&&&Dell Inspirion 15R \| Intel Core i5 @ 2.5 Ghz (Up to 3.1Ghz) \| 6GB DDR3 @ 1333Mhz \| Intel Graphics HD 3000 \| 750GB HDD \| Windows 7 Home Premium
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EdwardS Full Member Offline Posts: 63 Joined: Jul 5^th, 2010	Re: Thrust Needed to Taxi Reply #3 - Feb 23^rd, 2012 at 1:34pm	Print Post
	NNewcomb wrote on Feb 23^rd, 2012 at 1:02pm: EdwardS wrote on Feb 23^rd, 2012 at 4:02am: ...and I did update the static thrust to 17,400. The CS 727 has weak thrust. You can change it is the aircraft.cfg folder from 15500 over 17400. ROFLOL � Apologies NNewcomb; however, you quoted where I said I changed the thrust to 17,400 then advised that I change the thrust to 17,400. I found that extremely funny. @ windplayer: The surface type is a factor, yes. I think I will remove then install it again and see what happens. It is not just taking 40% to start the roll it takes that much to continue the roll. I did check the brakes and even restarted a new flight on the off chance it was a glitch. I suspect the first install was working correctly and this one is corrupted for whatever reason. I simply wanted to ensure my suspicion was correct. This bird has surprised me before by behaving normally when I thought something it was doing was abnormal.


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NNewcomb Senior Member Offline 757-200, 767-300, 727-100, 727-200, 727F, 737-200 Posts: 604 Location: United States Joined: Jun 29^th, 2010 Gender:	Re: Thrust Needed to Taxi Reply #4 - Feb 23^rd, 2012 at 6:07pm	Print Post
	EdwardS wrote on Feb 23^rd, 2012 at 1:34pm: NNewcomb wrote on Feb 23^rd, 2012 at 1:02pm: EdwardS wrote on Feb 23^rd, 2012 at 4:02am: ...and I did update the static thrust to 17,400. The CS 727 has weak thrust. You can change it is the aircraft.cfg folder from 15500 over 17400. ROFLOL � Apologies NNewcomb; however, you quoted where I said I changed the thrust to 17,400 then advised that I change the thrust to 17,400. I found that extremely funny. @ windplayer: The surface type is a factor, yes. I think I will remove then install it again and see what happens. It is not just taking 40% to start the roll it takes that much to continue the roll. I did check the brakes and even restarted a new flight on the off chance it was a glitch. I suspect the first install was working correctly and this one is corrupted for whatever reason. I simply wanted to ensure my suspicion was correct. This bird has surprised me before by behaving normally when I thought something it was doing was abnormal. Haha My bad!

	�Nick&&&&Dell Inspirion 15R \| Intel Core i5 @ 2.5 Ghz (Up to 3.1Ghz) \| 6GB DDR3 @ 1333Mhz \| Intel Graphics HD 3000 \| 750GB HDD \| Windows 7 Home Premium
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EdwardS Full Member Offline Posts: 63 Joined: Jul 5^th, 2010	Re: Thrust Needed to Taxi Reply #5 - Feb 25^th, 2012 at 5:04am	Print Post
	Looks like I'm going to need to remove and install FSX again. I have been working on this problem and cannot get it resolved. I even tried it with my Saitek unplugged, in an airtrik, 170 pounds pax, and 9 pounds of fuel. Even with 50% thrust the airtrik would not move an inch.


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CoolP Senior Member Offline Posts: 2568 Joined: Jan 17^th, 2010 Gender:	Re: Thrust Needed to Taxi Reply #6 - Feb 25^th, 2012 at 10:16am	Print Post
	It's an inherent flaw of FSX to give way too much ground friction. This value may also differ on the actual surface you are on. Not speaking about some grass strips, but the variants of the hard surface in FSX. So you will always see too high N1 values for taxi and the 'wrongness' differs a bit with the location and its surface. Some other devs tried to cheat that behaviour with custom engine models and things, but the success isn't that clear in my eyes. I really doubt that reinstalling FSX helps or that a wrong installation of the CS plane triggers the wrong behaviour. The ground friction stuff is fixed and the same goes for the values in the air file and the aircraft.cfg of the plane. Can you try slewing her to another parking spot or even airport to check if the 50+ values are needed at all spots? I sometimes see the difference when I want to powerback with my prop planes. On the one spot it works, on the other it doesn't. Fuzzy logics. �


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EdwardS Full Member Offline Posts: 63 Joined: Jul 5^th, 2010	Re: Thrust Needed to Taxi Reply #7 - Feb 25^th, 2012 at 10:20am	Print Post
	I tested on the active at KMEM. Besides at 50% thrust with an Air Creation Trik it should at least crawl forward. I removed FSX and installed it back now things are working perfectly again. It wasn't friction it was the brake. When I did get the Trik, or anything for that matter, rolling and backed off the power you could see the nose jerk from the braking action.


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CoolP Senior Member Offline Posts: 2568 Joined: Jan 17^th, 2010 Gender:	Re: Thrust Needed to Taxi Reply #8 - Feb 25^th, 2012 at 10:38am	Print Post
	So your brake was on? Do you run some pedals? I have a deadzone there for exactly that reason. But good news to read about success now.


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EdwardS Full Member Offline Posts: 63 Joined: Jul 5^th, 2010	Re: Thrust Needed to Taxi Reply #9 - Feb 25^th, 2012 at 4:40pm	Print Post
	EdwardS wrote on Feb 25^th, 2012 at 5:04am: I even tried it with my Saitek unplugged Yes, I use Saitek pedals and with a restart of the computer and never plugging them in the problem was still present. It was happening with all planes I tried it on.


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