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Yet another case of rocking... (Read 4600 times)

boeing247 Senior Member Offline Pilots: Looking down on people since 1903 Posts: 1506 Location: Southern CA Joined: Feb 23^rd, 2011 Gender:	Yet another case of rocking... Feb 27^th, 2011 at 9:10pm	Print Post
	My 707 was working perfectly (I thought I finally have all the kinks worked out) until all of a sudden the plane started rocking side to side. It's not violent, but it is noticeable, and if you were flying in it, it might churn your stomach. I searched "rocking" on the forums and tons of posts came up on the 757 and 767, but I didn't notice any for the 707. Oh, I had autopilot on. Any ideas on what might be going on?

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MustanGrande Full Member Offline Posts: 25 Joined: Jan 24^th, 2011	Re: Yet another case of rocking... Reply #1 - Feb 27^th, 2011 at 10:37pm	Print Post
	What autopilot mode were you running in? If you were tracking a course, the plane might have developed "Autopilot Induced Oscillations," weaving back and forth across the "beam," trying to zero in, but overshooting. That's about the only logical reason I can think of.


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boeing247 Senior Member Offline Pilots: Looking down on people since 1903 Posts: 1506 Location: Southern CA Joined: Feb 23^rd, 2011 Gender:	Re: Yet another case of rocking... Reply #2 - Feb 28^th, 2011 at 1:51am	Print Post
	I had autopilot on "NAV". I think that it was weaving... is there a solution for that?

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701151 Senior Member Offline Delta 737-200 Posts: 1009 Location: UNITED STATES Joined: Jan 29^th, 2011 Gender:	Re: Yet another case of rocking... Reply #3 - Feb 28^th, 2011 at 2:43am	Print Post
	Well, with primitive autopilots, and heading indicator that weren't always slaved, the aircraft was constantly trimming, and tunign itself to maintain a heading, depending on wind, temperature, altitude etc.


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boeing247 Senior Member Offline Pilots: Looking down on people since 1903 Posts: 1506 Location: Southern CA Joined: Feb 23^rd, 2011 Gender:	Re: Yet another case of rocking... Reply #4 - Feb 28^th, 2011 at 5:25am	Print Post
	So the rocking is realistic? That actually happened to old jetliners?

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Markoz CS Team Offline Posts: 12373 Location: Victoria, Australia Joined: Apr 24^th, 2009 Gender:	Re: Yet another case of rocking... Reply #5 - Feb 28^th, 2011 at 12:29pm	Print Post
	You are probably too heavy for the altitude you are flying at (Dutch roll). Descend 1000-2000 feet and see if it stops. If not, continue trying lower altitudes (1000 foot increments) until it stops. Mark

	Mark Fletcher PC: i7 10700K @3.8/5.1GHz \| 64GB DDR4 3200 \| 12GB RTX 4070 Super \| 32" LCD Monitor \| 1TB SSD & 2x2TB SSD \| Win 11 Pro - FSX/FSX-SE/P3D3/P3D4/P3D5/P3D6/MSFS2020 15.6" Gaming Laptop: i7 7700HQ \| 32GB DDR4 \| 6GB GTX 1060 \| 256GB SSD & 1TB HDD \| Win 10 Pro 64bit - FSX-SE/P3D4
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701151 Senior Member Offline Delta 737-200 Posts: 1009 Location: UNITED STATES Joined: Jan 29^th, 2011 Gender:	Re: Yet another case of rocking... Reply #6 - Feb 28^th, 2011 at 2:14pm	Print Post
	Well, it would happen. Even the SR-71 had rocking at Mach 3.5!!! It also had some wierd yaw too! But yes, they could rock back ande forth. Like with the Cessna 195, it used to ungulate in altitude when you had it al trimmed up, it wasn't until the 3-axis autopilt that the Cessna 195 could maintain alititfue perfectly.


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boeing247 Senior Member Offline Pilots: Looking down on people since 1903 Posts: 1506 Location: Southern CA Joined: Feb 23^rd, 2011 Gender:	Re: Yet another case of rocking... Reply #7 - Mar 1^st, 2011 at 2:24am	Print Post
	The SR-71 rocked at high altitude? Huh. Any jerky movements at high speeds can potentially disintegrate the plane without warning (you can use manual inputs on the Blackbird once you get much above Mach 2, or you'll rip the plane to shreds--you have to use autopilot controls). That must have been pretty scary for the pilot...

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701151 Senior Member Offline Delta 737-200 Posts: 1009 Location: UNITED STATES Joined: Jan 29^th, 2011 Gender:	Re: Yet another case of rocking... Reply #8 - Mar 1^st, 2011 at 2:37am	Print Post
	No, it would wobble a bit and it would yaw sideways due to ultra-high speeds.


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boeing247 Senior Member Offline Pilots: Looking down on people since 1903 Posts: 1506 Location: Southern CA Joined: Feb 23^rd, 2011 Gender:	Re: Yet another case of rocking... Reply #9 - Mar 1^st, 2011 at 4:46am	Print Post
	Well, I'm no expert, so you could be right. I just was reading a book called Mission to Chara, a novel in which a pilot has to extract an agent from Russia with a SR-71. While he was flying back at high speeds, he couldn't use the stick because he risked severely damaging the plane. By the way, the SR-71 is a plane that CS might want to look into. There's one for FS9, but not for FSX...

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701151 Senior Member Offline Delta 737-200 Posts: 1009 Location: UNITED STATES Joined: Jan 29^th, 2011 Gender:	Re: Yet another case of rocking... Reply #10 - Mar 1^st, 2011 at 2:15pm	Print Post
	Yeah, I enjoyed my SR-71, but no longer use FS2004 (currently converting the Wright Flyer to FSX). But I think Captain Sim should make a Douglas DC-8 next, the the new Cessna Citation TEN. (its different cuz it has a G5000 avionics suite, and its called TEN instead of X).

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boeing247 Senior Member Offline Pilots: Looking down on people since 1903 Posts: 1506 Location: Southern CA Joined: Feb 23^rd, 2011 Gender:	Re: Yet another case of rocking... Reply #11 - Mar 2^nd, 2011 at 2:16am	Print Post
	I have a freeware citationX, and I agree, CS could do sooooo much better.

	-Bram Osterhout&&&&&&&&Dell XPS 8300 \| Windows 7 64 Bit \| AMD Radeon HD 6770 \| Intel i7-2600 @ 3.40GHz \| 1000GB Hard Drive
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