Check this out. http://forum.avsim.n...opic/340367-hi/

SWA737 (As you haven't signed your real name I'll have to call you by your nickname)Why are you posting this link to a non-working page, in multiple threads?

Flamin_Squirrel: Let's not split hairs - the yaw damper measures lateral accelerations.

NO IT DOESN'T. You obviously can't tell the difference between linear and rotational motion.I'm a qualified pilot and I've a degree in engineering. If you want to continue to believe the rubbish you're spouting fine, just keept it to yourself instead of confusing other people with inaccurate information.

Check this out. http://forum.avsim.net/topic/340367-hi/

Good grief man child, give it a rest... please.

Regarding speedbrakes and slowing down in the descent, this is going to be a VERY noticeable difference with the NGX vs. other addons you may have.The speedbrakes are going to seem far less effective than what you're probably used to. You will not be able to extend the speedbrakes and slow down in a 2000 FPM descent with this rendition of the 737. This is entirely realistic and matches up with the actual Boeing performance numbers as well.The 737-800 in particular out of all the variants is an exceedingly slippery airplane even with the speedbrakes out - one of the hardest to slow down in the entire Boeing fleet in fact. One of our tech team pilots flies the 800 exclusively at his airline and he commented multiple times that in the real thing it's almost impossible to descend and slow down at the same time until you're around Flaps 10-15 with the gear out and already on the approach. Vangelis worked extremely hard with the flight model to get this aspect of it right.What all of this means is that you're going to have to learn about energy management and plan ahead. Make good use of the shallow VNAV DECEL segments (assuming ATC allows you to stay on path) to slow down and stuff like that. If you let the airplane get too far ahead of you, the speedbrakes are not going to save you - you'll be high and fast and you'll be doing a go-around.

Ryan, any chance we could see a snippet of code - just one randomly copied and pasted line (without explanation from PMDG as to what it refers to) so that we customers can see what the code behind the aircraft looks like? I've always been curious about it, even if I don't understand any of it whatsoever!

Ryan, any chance we could see a snippet of code - just one randomly copied and pasted line (without explanation from PMDG as to what it refers to) so that we customers can see what the code behind the aircraft looks like? I've always been curious about it, even if I don't understand any of it whatsoever!

  return false;}

:PJust a rough guess this line might or might not appear anywhere in the code... (sorry I'm j/k :()

@Flamin_Squirrel: What has linear vs. rotational got to do with it? It is not sensing it's position in space, it is sensing MOTION about the vertical axis. In order to achieve this it senses the ACCELERATION of this motion.If we were interested in whether the motion was linear vs. rotational, we would have to establish position and angular motion, but it is not capable of determining this.Do you by chance have a schematic of the yaw damper system among your course notes? They would be interesting to look at.Best regards,Robin.

...we would have to establish position and angular motion, but it is not capable of determining this.

That's EXACTLY what it does. Yaw rate sensors sense rotation about the vertical axis. These sensors provide raw data to a signal processor that's looking for occilations of specific freqencies about said axis. If it detects them, it commands the yaw damper to move the rudder in order to dampen them out.

Do you by chance have a schematic of the yaw damper system among your course notes? They would be interesting to look at.

Don't think so. Unfortunately I don't have them handy to check either.

http://www.mathworks.com/products/control/demos.html?file=/products/demos/shipping/control/jetdemo.htmlBest regards,Robin.

http://www.pprune.org/tech-log/152139-yaw-dampers.html#post1616724Just for clarity, to measure acceleration is to measure the RATE of change of velocity.Best regards,Robin.

Or the dervitive, the slope the blah blah blah blah blah. Why couldn't you guys have taken this to PMs and not trashed this whole thread?