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 25 Yawing (Read 14296 times)
Mustang1977
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Re: Yawing
Reply #30 - Feb 1st, 2015 at 10:16pm
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Heyo, nice to hear that  Smiley

And what was the cause? FF now ok?
  

 
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ftwd
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Re: Yawing
Reply #31 - Feb 2nd, 2015 at 12:27am
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Pleased you got it sorted  Smiley
  

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Colvale
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Re: Yawing
Reply #32 - Feb 2nd, 2015 at 12:36am
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Hi Mustang1977

FF was ok. It has never been an issue with any other add-ons, so I ruled that out. That was not the issue.

I had stupidly, while following the Tutorial for the CS L-1011 which sets the fuel load in kgs, changed the Unit of Measure settings to metres, but did not twig that it also affected aircraft altimeters, hence when I was at 12000m, I mistakenly thought it was 12000ft, and wondering why it was climbing slowly and not getting to CL. Not surprising with a 50% fuel load.

Today's flight, even with full 100% tanks, I was at 31k CL at a point above the east coast of England as the AivlaSoft EFB predicted I'd be. Result.

Now to configure the CIVA  INS, next. Cheesy Cheesy
  
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Markoz
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Re: Yawing
Reply #33 - Feb 2nd, 2015 at 2:23am
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Mustang1977 wrote on Feb 1st, 2015 at 8:18am:
Markoz wrote on Feb 1st, 2015 at 1:52am:
His speed may be MACH 0.7, but the airspeed indicator shows about 190 knots and that is way too slow, even at 12,500 metres. Shocked


Attention, 12.500 metres are near 41.000 feet - 190 KIAS for that alt would be alright.

At 41,000 feet, with a gross weight of 189,764 pounds (payload 19,420 and 27,344 pounds of fuel (~18% fuel)) and flying at 190 knots (MACH speed was about 0.67/0.68), my 707-300 had a very pronounced rocking left & right. It really looked like it was on the verge of stalling. While 190 knots at 41,000 feet may not be a stall at that weight/altitude, it is certainly not very stable. In fact, it all started once the speed dropped to about 250 KIAS, and got worse as I slowed. When I throttled up, it took forever to gain much speed (after 5 minutes I was only doing 230 KIAS with full throttle) all the while rocking left and right.

Edit. Fuel flow was ~1000 PPH
  

Mark Fletcher



PC: i7 10700K @3.8/5.1GHz | 64GB DDR4 3200 | 8GB RTX 2070 | 32" LCD Monitor | 1TB SSD & 2x2TB SSD | Win 11 Pro - FSX/FSX-SE/P3D3/P3D4/P3D5/P3D6/MSFS2020
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Mustang1977
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Re: Yawing
Reply #34 - Feb 2nd, 2015 at 11:08am
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Greetings,

@Colvale: Alright, so it was from the beginning a "measure-setting" problem. You should never change this after a fresh install of FSX. Always use of US-Units (Feets/LBS) is recommended. If you need a unit in another value, recalculate it with the corresponding formula. There are many good sites in the INET that made that for you  Smiley

@Markoz: I recommend to use my tipp in my reply #1 and you have a stable 707 also in high altitudes  Wink I guess this depends more with the AP.
  

 
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Markoz
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Re: Yawing
Reply #35 - Feb 2nd, 2015 at 8:48pm
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@Markoz: I recommend to use my tipp in my reply #1 and you have a stable 707 also in high altitudes  Wink I guess this depends more with the AP.

So your saying that if I modify the roll_stability=1.0 to roll_stability=1.5, then my 707-300 will be more stable at FL410? Fair enough. Sorry, but that's not going to happen. The 707 flies fine on the default settings for me, and I always fly at between MACH 0.78 and 0.82 anyway, and I don't have any problems with it at FL410 if I fly there. Wink
  

Mark Fletcher



PC: i7 10700K @3.8/5.1GHz | 64GB DDR4 3200 | 8GB RTX 2070 | 32" LCD Monitor | 1TB SSD & 2x2TB SSD | Win 11 Pro - FSX/FSX-SE/P3D3/P3D4/P3D5/P3D6/MSFS2020
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Colvale
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Re: Yawing
Reply #36 - Feb 2nd, 2015 at 9:35pm
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Just made my 2nd flight today, the return leg EPKK-EGCC and I'm glad to say it went off flawlessly. No yawing, no struggling to get to first 35k then later in the flight to 37k all with 50% fuel load. The LOC/VOR for the landing worked a treat. In fact everything now is nirvana for me with this plane. I'm really beginning to enjoy it.

I only wish I could get an Air India repaint for it. I've hunted high and low, without any success. Smiley Smiley
  
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ftwd
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Re: Yawing
Reply #37 - Feb 3rd, 2015 at 10:24am
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That's great news, I thought from your picture that it must have been the metres/feet setting  Wink
  

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braudoux
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Re: Yawing
Reply #38 - Jan 25th, 2016 at 4:04pm
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Hi Guys,
Does anyone know:
- if there is a Yaw Damper switch in E-3A cockpit  Roll Eyes
- if yes, where darned is it?  Cheesy
I experienced some crazy "up and down tremors" during my last flight (same as B737 when Yaw Damper is disconnected), so I am wondering if it is not the same symptom Undecided
Thanks for help
Bruno
  
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Markoz
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Re: Yawing
Reply #39 - Jan 26th, 2016 at 1:44am
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braudoux wrote on Jan 25th, 2016 at 4:04pm:
Hi Guys,
Does anyone know:
- if there is a Yaw Damper switch in E-3A cockpit  Roll Eyes
- if yes, where darned is it?  Cheesy
I experienced some crazy "up and down tremors" during my last flight (same as B737 when Yaw Damper is disconnected), so I am wondering if it is not the same symptom Undecided
Thanks for help
Bruno

On page 43 of the ‘707 Captain’ FLIGHT MANUAL Part II – Aircraft and Systems (cs707_manual1.pdf), under the heading of O04. HYDRAULIC POWER SYSTEM, it lists the Rudder Switch instructions:

ON: Opens rudder boost shutoff valve.
OFF: Shuts off rudder boost pressure and series yaw damper.

So that's the switch you need to make sure is ON.

What you are describing sounds like a Dutch Roll, which happens when the 707 (or any aircraft) is too high for its current gross weight. I usually descend until it gets more stable. Wink
  

Mark Fletcher



PC: i7 10700K @3.8/5.1GHz | 64GB DDR4 3200 | 8GB RTX 2070 | 32" LCD Monitor | 1TB SSD & 2x2TB SSD | Win 11 Pro - FSX/FSX-SE/P3D3/P3D4/P3D5/P3D6/MSFS2020
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braudoux
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Re: Yawing
Reply #40 - Feb 2nd, 2016 at 2:29pm
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Merci Markoz,
I used to check that during my Before Start Check List but did not realize that this was the Yaw Damper switch... Shocked
Got it, but it was not clear to me.
I'll try that next time I experience the same issue.
Thanks Smiley
Bruno
  
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