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Showing results for tags 'pitch'.
Found 3 results
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When flying at lower speeds (e.g., during approach phase) with autopilot on I'm seeing the pitch trim go to an extreme high value (nose up). The aircraft noses up and cannot be persuaded to descend. I have to turn off the autopilot and set the pitch to something more reasonable, but doing that while struggling with an out of control aircraft can be quite difficult. When adjusting the pitch trim, one cannot see where the aircraft is going. I do have a couple joystick buttons assigned to pitch trim, so I can use those more conveniently. However, my real question is what can cause the pitch trim to go extreme position like this while flying? Center of gravity? Just flying too slow? I don't have this issue with other aircraft. Also, I don't remember having this issue with an earlier version of the Saab 340A. I have flown the Saab 340 v1.4.1 only twice so far, so I'll keep an eye out as to whether or not this is a consistent problem or intermittent.
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Hi there, Absolutely amazed by this simulation. By far the most accurate airliner I've seen on any platform, fantastic job! I am aware of others experiencing this issue and after trying the suggestions wanted to describe the conditions which I seem to experience it. Hopefully someone else may have seen/fixed this issue. During startup, the first engine sounds detectable in the flight deck appear as a low frequency humm of increasing pitch (proportional to N2/N1 speed) at around 15% N2. This sound is normally present throughout all engine speed ranges and the frequency (pitch) of the sound is always proportional to engine speed (fairly high pitch but quiet at idle). The issue is that I do not always get this sound (it's not clear what conditions stop this sound). I will always get the transient low frequency humm at light off (just as fuel is introduced to combustion chamber) but the higher pitch "permanent" sound is a little more hit or miss. i have found a few ways to get the missing sound back: 1. Firewall the throttles with the engines at idle (the sound will reappear as the engines accelerate past approx 70% N1) and then slowly retard the throttles back to idle. Pull the throttles back too quickly and the sound disappears again. 2. During start (just after light-off), set fuel cutoff switches to cutoff then back to run. 3. If the sound doesn't appear at start, click on save changes on the preflight menu to reset the aircraft to a "turnaround" configuration. I have tried uninstalling the gnd handling plugin but again this sound issue remains. Note that the issue is intermittent and possible to get around but with such an immersive simulation it seems a shame to have to resort to revving engines just after start! Anyone else with experience this problem? Any other solutions to try? FYI using XP10. Thanks!
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Dear my fellow aircraft builders! I am in the early stages of a Learjet 45 (XR) project, currently working on the flight model and basic 2D cockpit. The fuselage, wing sizes, positions, stabilizers are all build from a 3-view-image that I imported and measured within a CAD software. So all positions and sizes set in Plane Maker should be "quite good". Area of interest is the horizontal stabilizer that is a moving surface to control the pitch trim and of course the magic center of gravity (cg). Facts: The Learjet 45 (LJ45) has a moving horizontal stabiizer to control the pitch trimI modeled that through the use of the appropriate settings in the control surfaces and made the hor. stab. a moving surfaceAccording to the FAA certificate the LJ45 has some "strange" hor. stab. max. deflections http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/880d41da2731227386257d5d006b9505/$FILE/T00008WI_Rev20.pdfi.e.: leading edge up trim = -0.3° and leading edge down trim = -9.5° -> that means NO positive incidence of the hor. stab. at all? I modeled that in Plane Maker the following way:set the incidence of the hor. stab. to -4.9° (middle position between -9.5° and -0.3°)set the control surface defllection up and down to 4.6° (so i can reach -0.3° and -9.5° with max. trim in both directions)set airfoil to symetric NACA009 (I have NO information about the hor. stab. airfoil of that bird)cg of gravity is set in the middle according the FAA cert. and AFM (middle of 1% MAC and 28% MAC)Problem (or maybe this is not a problem, but just "normal"?):: when I go the a very fast speed (within the envelope!) e.g. 330 KIAS at 3.000 feet (.. and loose my licence ;-) the max pitch trim brings the hor. stab to -0.3% (nearly straight level, but no pos. incidence allowed) the hor. stab still produces too much DOWNFORCE that the nose of the aircraft goes UP and I can not trim the plane and must use elevator to hold it straight leveled.I can test more situation and bring the aircraft to exxtreme weight/balance situations WITHIN the flight envelope and weight / balance specs. that I can not trim the aircraft Ideas / Questions: Is this a problem? Or is it "normal" that a aircarft is NOT trimmable within the flight envelope and weight / balance specs?Did I read the FAA spec. correctly? i.e. the incidence is always negative betwenn -0.3° and -9.5°I am really questioning the -0.3° max. UPTRIM... when I could set that to 0° or +1° all problems would be solved? But the cert. says -> NO only negative? ;-) If anyone even has the time to take a testflight, I can send you a link to the current acf. Your help and ideas are very welcome!
