Tucano_uy Posted December 23, 2011 Posted December 23, 2011 (edited) If I'm not wrong, in the sim when autopilot gets disconnected the warthog reverts to whatever trim setting was applied before engaging the AP. No idea how does it work IRL but when you disconnect AP, shouldn't the aircraft remain trimmed as the autopilot left it? Of course, before engaging the AP the acft should be properly trimmed but as an example, if you trim for take off, take off, level off, engage AP without trimming, speed up, and then disengage AP, the aircraft will take a severe nose up attitude. Shouldn't it keep the trim from the AP and maintain it's level? (It works this way in LOMAC and FC2). Edited December 23, 2011 by Tucano_uy
kylania Posted December 23, 2011 Posted December 23, 2011 Trim changes constantly. Any time you change speed you'll need to change it. Don't think of the autopilot as a trim replacement, it's not. [sIGPIC][/sIGPIC] Christmas Cheer - A Landing Practice Mission : Beta Paint Schemes : HOTAS Keyboard Map : Bingo Fuel - A DCS A-10C Movie
cichlidfan Posted December 23, 2011 Posted December 23, 2011 Shouldn't it keep the trim from the AP and maintain it's level? (It works this way in LOMAC and FC2). No, and it shouldn't!:D ASUS ROG Maximus VIII Hero, i7-6700K, Noctua NH-D14 Cooler, Crucial 32GB DDR4 2133, Samsung 950 Pro NVMe 256GB, Samsung EVO 250GB & 500GB SSD, 2TB Caviar Black, Zotac GTX 1080 AMP! Extreme 8GB, Corsair HX1000i, Phillips BDM4065UC 40" 4k monitor, VX2258 TouchScreen, TIR 5 w/ProClip, TM Warthog, VKB Gladiator Pro, Saitek X56, et. al., MFG Crosswind Pedals #1199, VolairSim Pit, Rift CV1 :thumbup:
Depth Posted December 23, 2011 Posted December 23, 2011 (edited) Of course, before engaging the AP the acft should be properly trimmed but as an example, if you trim for take off, take off, level off, engage AP without trimming, speed up, and then disengage AP, the aircraft will take a severe nose up attitude. Shouldn't it keep the trim from the AP and maintain it's level? (It works this way in LOMAC and FC2). If you set trim to fly perfectly straight at 200 KIAS and increase throttle, the plane will naturally pitch up to maintain 200 KIAS. Likewise if you decrease throttle the plane will drop to maintain 200. The AP doesn't touch the trim, and all the while it's flying it's keeping a very high stick input to correct for the trim. If it gets too high it'll disconnect. Edited December 23, 2011 by Depth [sIGPIC][/sIGPIC]
Tucano_uy Posted December 23, 2011 Author Posted December 23, 2011 OK, maybe my wording was wrong. My doubt is not about trim use and effects of increasing or decreasing power. I thought that AP would trim in addition to command the main control surfaces. It doesn't seem reasonable (but maybe that's just the way it is) that the AP would command and steer without trimming. If the case was that the AP does trim, the question was if the trim was reset upon disconnection. thx
BlueRidgeDx Posted December 23, 2011 Posted December 23, 2011 The LAAP does not trim; it uses the SAS channels to drive the control surfaces directly through the hydraulic actuators. The LAAP (through the SAS) only has authority to move the elevators 2° nose down, and 5° nose up. There is no roll control available through the LAAP, so heading is controlled with the rudders, which have 10° authority. Trim the airplane for the desired conditions before engaging the LAAP, otherwise you're unnecessarily using up the available control authority. If the LAAP (SAS) reaches the defined control surface limits, it will disengage and you'll have a handfull of airplane. "They've got us surrounded again - those poor bastards!" - Lt. Col. Creighton Abrams
Nu-NRG Posted December 24, 2011 Posted December 24, 2011 LAAP (SAS) reaches the defined control surface limits, it will disengage and you'll have a handfull of airplane. Or in other words, lets say someone is doing the steering for you and when that person lets go of the steering wheel, what happens? You immediately take control/charge over steering wheel. And when cam/toe/steering is out of alignment (trim if you will) it is so much more apparent. Aviate - Navigate - Communicate
Tucano_uy Posted December 24, 2011 Author Posted December 24, 2011 Thank you all for the answers. Nice one BlueRidge. Good example Nu-NRG.
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