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Yaw induced roll. On some planes but not all?

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Wondering why it is that some planes react to yaw induced roll and some do not. If I step on a rudder pedal I should start rolling that direction. Also in a crosswind landing, say a right crosswind, left rudder would require right aileron. Can't see anything in the aircraft cfg that would seem to be applied to this affect. Anyone know about this?

Yaw induced roll, and the amount of roll, depends upon a number of things, Grant, the major reason being the amount of dihedral built into the mainplanes (the wings). Other reasons include the masking effect of the fuselage on the inside-turning wing; the area and depth (below the datum line) of the rudder; the wing planform, even the center of gravity will have an impact.The effect is included in the airfile, but not in the aircraft.cfg.

Edited by Paul J


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  • Author

Thanks for that detail. Sounds like this is something I can not change. Used notepad to open that air file and it looks something I can't mess around with. Or can I? Going to Google for an airfile editor and see what I can find. I'm wanting to use a "Bird dog" that flies very realistic exept for that, uh, what you said. Thanks Paul. Grant06/Paul (also).

Yes you can....but you need one of these 2 air file editors: AAM and/or AirEDhttp://www.aero.sors.fr/fsairfile.htmlFor yaw/roll go to section 1101 primary aerodynamics

Edited by bstolle

  • Author
Yes you can....but you need one of these 2 air file editors: AAM and/or AirEDhttp://www.aero.sors.fr/fsairfile.htmlFor yaw/roll go to section 1101 primary aerodynamics
Thanks for that. Under 1101/ ---Yaw--+=Nose Left-- I'm a bit confused as to which peramiter to select here. Looks like those selections offer comparisons to other aircraft which is handy. Just cant figure which one. Thank you very much.Grant06/Paul
Yes you can....but you need one of these 2 air file editors: AAM and/or AirEDhttp://www.aero.sors.fr/fsairfile.htmlFor yaw/roll go to section 1101 primary aerodynamics
Hi Bstolle, I have managed to make a few modifications using the a/c CFG file and also using AirED. However, of 8 addons there are 2 of which I have not been able to increase its "speed limit" Once it gets to say Mach .85, I get the audible "over-speed" "over-speed" I modify this from the a/c CFG File under [Reference Speed] I'm sure different developers code their a/c differently in some areas. Is there a way to edit the reference speeds successfully on these 2 a/c that are not responding to my modifications? I want my a/c to go a bit faster that factory settings. See Example:cruise_speed=672 // KTAS @M0.99max_indicated_speed=772.000000 // 90% wing tip fuel, fudged for KCASmax_mach=0.991--- I have modified all except 2 of them...e.g my Jet Fighter goes at Mach 4.60 :(

Edited by Johnny767

@Grant06>Under 1101/ ---Yaw--+=Nose Left-- I'm a bit confused as to which peramiter to select hereIf you want to add a roll moment due to yaw, you need to go to the ----Roll---sectionExperiment with Cl_dr and Cl_r. There are many different ways to design the flight model in FSX and it's a lot of trial and error without a common recipe.@Johnny767The audible 'overspeed' warning is most probably being triggered by a gauge from your add-on.You need to open and change the associated gauge file....and that's an area I don't have the slightest clue....But with the changes you made in the cfg file, at least the 'overspeed' text on the screen should be gone.

  • Author

Thank you. That did the trick. Increased the Cl_drI and a few others. Now have to hold down the windward wing in a crosswind landing. Windward main as well. Also in flight rudder will induce a roll. Thank you very much. So then I do have a tweeked L-19 Birdog air and cfg if anyone wants.

Wondering why it is that some planes react to yaw induced roll and some do not. If I step on a rudder pedal I should start rolling that direction. Also in a crosswind landing, say a right crosswind, left rudder would require right aileron. Can't see anything in the aircraft cfg that would seem to be applied to this affect. Anyone know about this?
All swept wing a/c suffer from "Dutch Roll" either convergent or divergent. Yaw dampers and roll dampers keep this under control. When making a crosswind landing in a jet transport do not ever cross your controls as you will come down like a brick. To land in a cross wind crab the a/c nose into wind. Just before or just after touchdown depending on the strength of the cross wind kick the a/c straight with the rudder and hold the into wind wing down with your control column.vololiberista

3VlzBGn.jpg?1

Super VC10 into LOWI with PF3 at a cinema near you

https://www.youtube.com/watch?v=298UDyNmgUA

 

When making a crosswind landing in a jet transport do not ever cross your controls as you will come down like a brick. To land in a cross wind crab the a/c nose into wind.Just before or just after touchdown depending on the strength of the cross wind kick the a/c straight with the rudder and hold the into wind wing down with your control column.
Don't know for which jet your do not ever cross your controls applies. On all jets I've flown so far you can of course fly the approach cross controlled as well.Most autopilots start the align mode at 150ft during an autoland, which isn't exactly just before or after touchdown.Try to land a 767 crabbed, I don't think that you would do that twice after experiencing the result.

I think the actual technique and the preferences differ even among the pilots flying the same type. The FCTM offers three different crosswind approaches to allow for exactly that. But you may be surprised to read what Mr. Stolle is actually flying. At least from what I've read so far.

Edited by CoolP

Clearly you haven't experienced flying a big jet in reality!! Crabbing "is" the accepted technique.
Boeing says it's up to the pilot which technique he uses. But maybe you are right as the 767 isn't a big airplane :(
Clearly you haven't experienced flying a big jet in reality!! Crabbing "is" the accepted technique.vololiberista
vololiberista - I take it that you are not aware of bstolle being an active 767 Captain for a major airline. duh.What big jets do you fly in 'reality'?Ray

Edited by raymar

When Pigs Fly . Ray Marshall .

Crabbing is the standard technique for approach with a jet transport of any size. It is a perfectly safe manoeuvre even for a/c as small as a Socata Rallye. Go to a major airport you will never see any jet side slipping in a crosswind.vololiberista

3VlzBGn.jpg?1

Super VC10 into LOWI with PF3 at a cinema near you

https://www.youtube.com/watch?v=298UDyNmgUA

 

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