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Post by Tarasdad on Mar 27, 2008 6:08:20 GMT
I redownloaded and reinstalled all the files about a month ago for FS2004. All previous versions had been uninstalled/deleted because I was primarily flying FSX and needed more disk space. I have since reinstalled FS2004 and used the files found at Tom Gibson's California Classics website to backdate the install to late-50s/early-60s airports and AI. One thing I haven't done yet is check my FSUIPC version. I'll do that in the next day or two, just haven't had time yet.
There could be a ton of variables that are causing the issue. I just don't have the energy to go through a detailed testing process to see if I can determine what the ultimate cause is. For now I'm just going to use the VS wheel and fine control inputs to maintain altitude during course changes.
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Post by aerofoto - HJG Admin on Mar 27, 2008 7:02:19 GMT
OK .... try my FSUIPC suggestion please .... when you get time.
Also .... I must have the dates of those AIR.FILES for just the affected aircraft. I want to establish beyond all doubt that the files you have are indeed those uploaded during last August.
Thanks !
Mark
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Post by botamern on Mar 27, 2008 8:15:18 GMT
I've often found that porpoising is usually a result of bad Interia data in the aircraft.cfg. I took a look at the 707-320, and after some quick calculations, found that per the base pack that is available for download at present (I know, a shame I didn't already have it installed, but I am more of a 727 kinda guy), the 707-320 had Moments of Inertia more suited to a 777-200ER than a 707.
Try replacing the values currently in the aircraft.cfg with these and see if you don't get a smoother flight and fewer issues leveling off when using the A/P vertical hold at speeds >500fpm.
NOTE: Values only good for 707-320s.
empty_weight_pitch_MOI=3838677 empty_weight_roll_MOI=1444241 empty_weight_yaw_MOI=3768095 empty_weight_coupled_MOI =0
I am currently in the middle of TWA flight 403 EWR-STL-MCI-TUS-PHX and so far these new values seem to be helping. I flew EWR-STL with the aircraft as downloaded and nearly pulled my hair out trying to stay level. I tried a different fix for the STL-MCI flight and it didn't work that well. However, I am now just past Garden City, Kansas and except for a little bit of rocking caused by the 20 degree right cross wind, the plane is flying pretty smooth. I did a full autopilot climbout and the aircraft leveled off at FL320 from a 2000fpm climb with no more than a little nod as it intercepted the altitude.
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Post by Tarasdad on Mar 27, 2008 8:24:37 GMT
Mark, the 707-120 .air file is dated 10/15/2006 and the 707-320 airfile is 5/23/2006. All files as I said were recently redownloaded and reinstalled. The base pack file dates are 2/25/2008 for the -120 and 9/3/2007 for the -320. FSUIPC is version 3.7.8.3 dated 1/29/2008, unregistered. I'll download and install version 3.8 and see if it works.
Nick, I'll keep those changes in mind. Right now I'm just too tired to even think about messing with my .cfg files. Once I hang the load of laundry that's in the washer I'm hitting the sack!
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Post by aerofoto - HJG Admin on Mar 27, 2008 10:20:20 GMT
"TARASDAD" .... I'll check those dates against what they should be for that last August 2007 FDE upload .... and PM you later .... tomorrow sometime. I'm starting to get tired too now ! Mark C AKL/NZ
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Post by aerofoto - HJG Admin on Apr 2, 2008 5:52:00 GMT
"TARASDAD" .... I've just sent you a PM ! Mark C AKL/NZ
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Post by Tarasdad on Apr 2, 2008 19:43:33 GMT
Mark, received and replied. Thanks!
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Post by aerofoto - HJG Admin on Apr 26, 2008 17:54:32 GMT
Despite my previous insistence that ¨POPOISING¨should never ocurr .... today I experienced a little of this for the very first time ever. Until now .... all my flights with these aircraft models have been conducted at default gross weights .... as established per FS at the start of any flying session and without any fuel/payload adjustment whatsoever. I typically perform all my test flying this way .... because I figure it's what the majority of users are probably doing, and if so, it allows me to relate firsthand to whatewer problems might be experienced by some folk as a result. Flying up to FL310 in high gross weight conditions I've ¨NEVER¨experienced any porpoising whatsoever during AP controlled flight .... save for exrtremly rare occasions when I've made careless altitude captures .... as discussed in my previous postings (on another thread) and which I've long since learned how to avoid. Anyway .... today I was test flying some FDE adjustments being made to our C135-A. The first flight at high gross weight passed perfectly although climbing required extreme care and concentration .... constantly adjusting the ROC as necessary to maintain a good speed throughout the climb. Once established at altitude and in AP controlled flight cruise performance was perfectly stable and smooth .... just as always I've experienced previously with all of our aircraft. My 2nd flight with was performed with a reduced payload .... so as to remain inside the realworld MTOW limitations of these aircraft (and KC135-A) .... 316,000 LBS. Even so T/O performance was expectedly slow/long and the climb to altitude required similar precision and care per constant ROC adjustments. Upon acquiring FL310 the AP ALT HLD mode was engaged .... and for the first time ever I experienced very mild ¨PORPOISING¨. I managed to resolve this by disengaging ALT HLD (not the AP) .... then trimming to reacquire my desired altitude (31,000 FT) .... then re-engaging ALT HLD again. The selected altitudue was recaptured and no further ¨PORPOISING¨ocurred during the remainder of my 2 hour high altitude AP controlled flight test which passed with perfect stability. After this experience I began to wonder if any tendancy for these aircraft to ¨PORPOISE¨during AP controlled flight might be in some way related to reduced payloads .... or perhaps more appropriately .... encouraged by bad selected payload adjustments/configurations and maybe a little excessive speed. I started my C1335-A test flight with a fuel load reduction to promote a 316,000 LB MTOW (overload) .... then climbed to FL310 .... then maintained a cruising speed of MACH 0.835 / 320 KTS IAS.Just my 50 cents worth ! Mark C BOG/CO
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Post by aerofoto - HJG Admin on Nov 2, 2008 19:48:04 GMT
CONTINUING THIS CONVERSATION SINCE MY LAST POSTING DATED APRIL 26TH 2008For some inexplicable reason I'm now suddenly getting this same "porpoising" problem myself .... with all our Boeings and during high altitude AP controlled cruise and with ALT HLD selected "ON". All other flight performance is fine. I don't know what's suddenly brought this on in my case .... other than we recently installed SP3 for WINDOWS XP PRO some 3 weeks ago .... and only "AFTER" having last used our Boeing panels and gauges/core files with absolutely perfect peformance results. Prior to this .... and as I've maintained within each of my earlier reply postings on this particular thread (and in "BLUE STAR's" own similar posting on the FSX forum page) I've never experienced anything other than perfectly stable AP cotrolled flight within FS9/2004. SUDDENLY .... I've now got a problem Houston !!!! Despite all my trouble shooting attempts over the past few days (which also included updating, the gauges/core files, FDE, FSUIPC, checking controller device drivers etc, and also removing SP3 too) I can't seem to resolve this sudden problem !!!! I'm totally at a loss to explain this !!!! Mark C AKL/NZ
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Post by Tony Madge - HJG on Nov 2, 2008 19:53:44 GMT
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Post by aerofoto - HJG Admin on Nov 2, 2008 20:03:19 GMT
I know we are "DIRECT X9C" .... but .... I'm not certain what specific release date/version. I'll look at that later today Tony. THANKS !!!! Mark C AKL/NZ
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