HawkDCS Posted June 29, 2018 Posted June 29, 2018 (edited) When I take off sometimes with plane that is loaded ready to go on ramp, the T/O trim I set jumps at about 120KIAS. On the takeoff run if I watch the FCS page I will have it set to 15+ for weight etc. At about 120+ Kias the Stab Trim will jump to like 20 or 22 and you can see the stab jump up. I am not pulling to rotate I am neutral on stick and it jumps. This happens sometimes on cold A/C I start aswell. Here's a track of it.Trim Jump 2.trk Edited June 30, 2018 by HawkDCS Rig: 5960X @ 4.5GHZ 32GB 3000Mhz DDR4 Titan XP Dell 3415W 21:9 Thrustmaster Warthog
LURKINGBADGER Posted June 30, 2018 Posted June 30, 2018 Carrier ore field? Its normal on the Carrier [sIGPIC][/sIGPIC]
HawkDCS Posted June 30, 2018 Author Posted June 30, 2018 Field. Rig: 5960X @ 4.5GHZ 32GB 3000Mhz DDR4 Titan XP Dell 3415W 21:9 Thrustmaster Warthog
erautour Posted June 30, 2018 Posted June 30, 2018 Think you're only supposed to be using 12° NU trim on land. The plane probably thinks you're on the catapult and is doing it's thing for the end of the cat stroke.
HawkDCS Posted June 30, 2018 Author Posted June 30, 2018 I was under the impression that you needed to set Stab Trim to A/C weight per manual. Can you confirm you just set 12 Trim on ground? Rig: 5960X @ 4.5GHZ 32GB 3000Mhz DDR4 Titan XP Dell 3415W 21:9 Thrustmaster Warthog
mhe Posted June 30, 2018 Posted June 30, 2018 I was under the impression that you needed to set Stab Trim to A/C weight per manual. Can you confirm you just set 12 Trim on ground? That is what the T/O trim button on top of the rudder trim knob does and it is correct and realistic for land takeoffs. | i9 12900K | 64GB DDR5-6000 | STRIX RTX 4090 OC | LG 38GN950 38" | | Hanns-G HT225HPB | TIR 5 & Varjo Aero | Virpil Throttle & Stick | TM TPRs | You don't stop playing because you grow old, you grow old because you stop playing.
erautour Posted June 30, 2018 Posted June 30, 2018 I was under the impression that you needed to set Stab Trim to A/C weight per manual. Can you confirm you just set 12 Trim on ground? Yes. On land you press the t/o trim button and confirm you have 12 NU. Done. On the boat you hold t/o trim until you get the advisory and then add extra trim depending on weight.
HawkDCS Posted July 1, 2018 Author Posted July 1, 2018 Even if I just set it to 12 with T/O Trim it will jump on T/O roll to 16 something is up... Rig: 5960X @ 4.5GHZ 32GB 3000Mhz DDR4 Titan XP Dell 3415W 21:9 Thrustmaster Warthog
Flamin_Squirrel Posted July 1, 2018 Posted July 1, 2018 Post another track? Make sure you have the FCS page up.
HawkDCS Posted July 1, 2018 Author Posted July 1, 2018 Here is another track of it. Set to 12 with T/O Trim and on roll it jumps to 16 degrees...Trim Jump 3.trk Rig: 5960X @ 4.5GHZ 32GB 3000Mhz DDR4 Titan XP Dell 3415W 21:9 Thrustmaster Warthog
Flamin_Squirrel Posted July 1, 2018 Posted July 1, 2018 Don't see anything unusual, you're pulling back on the stick a fair amount.
HawkDCS Posted July 1, 2018 Author Posted July 1, 2018 (edited) Don't see anything unusual, you're pulling back on the stick a fair amount. Squirrel the stick is neutral when the jump occurs. :music_whistling: I am pulling hard to rotate because the plane is 45,500LBS with 12 Stab Trim. Here's another track of the issue and you can see the stick position. I am not even touching my stick and it goes from 12 to 16 degrees on T/O Roll.Trim Jump 4.trk Edited July 1, 2018 by HawkDCS Rig: 5960X @ 4.5GHZ 32GB 3000Mhz DDR4 Titan XP Dell 3415W 21:9 Thrustmaster Warthog
Flamin_Squirrel Posted July 1, 2018 Posted July 1, 2018 Ah sorry I was being stupid; I see what you mean now. Good spot. Perhaps the FCS thinks it's being shot off the cat? It doesn't seem right for a field launch.
BSS_Sniper Posted July 1, 2018 Posted July 1, 2018 I know the NATOPS says use 12 NU for land take offs, but I find following the carrier take off trim procedures/weight seems to work better. I hope it's just an early release thing that is causing this, meaning that 12 NU doesn't work well for a loaded down F18 taking off from a runway. I9 9900k @ 5ghz water cooled, 32gb ram, GTX 2080ti, 1tb M.2, 2tb hdd, 1000 watt psu TrackIR 5, TM Warthog Stick and Throttle, CH Pedals
Flamin_Squirrel Posted July 1, 2018 Posted July 1, 2018 The FCS is going from a ground state to a flight state and adjusting accordingly. On your takeoff roll let the aircraft rotate and come off the ground without applying any stick. The aircraft will fly away on its own, you don't want to yank it off the ground. No. This is happening prior to getting airborne. There's nothing in NATOPS that describes automatic pitchup for a field takeoff; indeed it says early back pressure doesn't work, so it makes no sense for the aircraft to automatically command nose up. The only time it does this is for a carrier takeoff, so IMO the most logical explanation is a bug. I think it's got confused and thinks it's taking off from the carrier.
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