Jronz Posted May 31, 2018 Posted May 31, 2018 Is there a quick way to reset Takeoff Trim after take off? I keep having to slowly trim it out while circling the carrier before i can do anything.
VFA41_Lion Posted May 31, 2018 Posted May 31, 2018 If you use the take-off trim button it will reset after a catapult launch (don't know about airfield, you have to check the FCS or CHKLST page) If you manually add more trim you will have to reset it yourself.
Doum76 Posted June 1, 2018 Posted June 1, 2018 Speaking of T/O Trim, dunno if i am doing something wrong, or was an old sim i was into ages ago and in there, they were wrong, or maybe not yet implemented, but i thought T/O Trim angle was different when launch bar was retracted or extended, as when launching from carrier T/O Trim was higher, something like 10 versus 12+ or so (can't remember exactly). Or maybe was it just a SuperHornet difference, i'm just being curious here.
REDEYE_CVW-66 Posted June 1, 2018 Posted June 1, 2018 Just to chime in here: When setting take off trim, and taking off from an airfield, with flaps in AUTO- the aircraft maintains and VERY significant positive trim, even after gear is retracted- to the point where I need to hold the stick far forward to trim back. I assume this is what the OP refers to. Obviously we are missing something. The issue does not happen with cat shots.
ruprecht Posted June 1, 2018 Posted June 1, 2018 So while connected to the shuttle in takeoff configuration, I hold the T/O Trim button until the trim stabilises on the FCS page. I still get a Master Caution when throttling up, and need to add more nose-up trim to clear it. Is this normal? DCS Wishlist: | Navy F-14 | Navy F/A-18 | AH-6 | Navy A-6 | Official Navy A-4 | Carrier Ops | Dynamic Campaign | Marine AH-1 | Streaming DCS sometimes:
VFA41_Lion Posted June 1, 2018 Posted June 1, 2018 you need additional trim for catapult launches depending on your aircraft weight.
Vantskruv Posted June 1, 2018 Posted June 1, 2018 Another question about trim. After landing on the carrier, and then lining up for another takeoff, pressing the takeoff trim button, I get a ’CHECK TRIM’ message. I guess the takeoff trim button is only affecting the stabilisator. Rest of the wings I guess you need to recenter to a neutral position to get rid of this message? Can I reference somewhere how much trim I have?
ED Team cofcorpse Posted June 1, 2018 ED Team Posted June 1, 2018 Takeoff should be performed with flaps in HALF. In that case everything will work as it should.
Nosferatuwhisky 1-1 Posted June 1, 2018 Posted June 1, 2018 I’ve not checked, but wouldnt the flaps either end up in full as you’re sitting on the ramp, or drop to full as you head down the runway? If you had them set to auto. That’s what the F-5 does, but it works well in the Tiger, seems not so much in the horny Hornet "Chops"
ruprecht Posted June 2, 2018 Posted June 2, 2018 I’ve not checked, but wouldnt the flaps either end up in full as you’re sitting on the ramp, or drop to full as you head down the runway? If you had them set to auto. With WoW and Flap AUTO, the flaps are set to 0. Once you were shot off the cat, they act as a function of AoA. DCS Wishlist: | Navy F-14 | Navy F/A-18 | AH-6 | Navy A-6 | Official Navy A-4 | Carrier Ops | Dynamic Campaign | Marine AH-1 | Streaming DCS sometimes:
Layzie Posted September 10, 2018 Posted September 10, 2018 So while connected to the shuttle in takeoff configuration, I hold the T/O Trim button until the trim stabilises on the FCS page. I still get a Master Caution when throttling up, and need to add more nose-up trim to clear it. Is this normal? This indicator is due to the lack of proper trim on the a/c prior to take off. Hitting the T/O trim button is not enough as that only sets your trim to 12° nose up. Takeoff trim settings are based off of the current weight of the a/c prior to takeoff. You can find your current a/c weight by selecting the cheklist (CKHKLST) page on any one of your DDI's. I have included a trim chart for reference.
Layzie Posted September 10, 2018 Posted September 10, 2018 [ATTACH]193760[/ATTACH]Another question about trim. After landing on the carrier, and then lining up for another takeoff, pressing the takeoff trim button, I get a ’CHECK TRIM’ message. I guess the takeoff trim button is only affecting the stabilisator. Rest of the wings I guess you need to recenter to a neutral position to get rid of this message? Can I reference somewhere how much trim I have? Your FCS page will tell you what your current trim settings are. I've included an image that shows all of your control surface values. Everything inside the red circle shows what your control surfaces are trimmed to. For takeoff you just need to focus on the STAB trim located inside of the yellow circle. Remember, takeoff trim is based off of weight. I've responded to someone else on this thread and have included a T/O trim chart.
Layzie Posted September 10, 2018 Posted September 10, 2018 Is there a quick way to reset Takeoff Trim after take off? I keep having to slowly trim it out while circling the carrier before i can do anything. The simple answer to this is, no. The jet's FCS will constantly be adjusting control surfaces to maintain stable (safe) flight. If you have a weight imbalance you will have to manually trim it. A sort of shortcut to this is by engaging the autopilot in alt hold and that should get you close to centered trim after takeoff, but it won't be perfect. Either way, it's still a lot less work than the A-10 which seemed like you would never remove your finger from the trim hat.
Jetguy06 Posted November 2, 2020 Posted November 2, 2020 Sorry for the necro, but I have a question about takeoff trim. The chart shows 16 degrees for 44,000lbs and below, and 17 degrees for 45,000lbs and above. But there's a "dead" space between 44,000 and 45,000. Say, a weight of 44,500 for example. That's above 44,000 so it can't be 16 degrees, but it's also less than 45,000 so it can't be 17 degrees. What setting should weights in that "dead" space be set to? Thanks.
Ziptie Posted November 2, 2020 Posted November 2, 2020 Sorry for the necro, but I have a question about takeoff trim. The chart shows 16 degrees for 44,000lbs and below, and 17 degrees for 45,000lbs and above. But there's a "dead" space between 44,000 and 45,000. Say, a weight of 44,500 for example. That's above 44,000 so it can't be 16 degrees, but it's also less than 45,000 so it can't be 17 degrees. What setting should weights in that "dead" space be set to? Thanks. I've never needed to adjust the STABs to more than 16 for takeoff (carrier or airfield). You should be more than fine with 16. Also, it should actually take 3 aft inputs on the trim switch to go from 15 to 16 (or 12 to 13), so you could make the decision to get the STABs to 16, then aft on the trim switch once more - which one could say is probably 16.5 Cheers, Ziptie i7 6700 @4ghz, 32GB HyperX Fury ddr4-2133 ram, GTX980, Oculus Rift CV1, 2x1TB SSD drives (one solely for DCS OpenBeta standalone) Thrustmaster Warthog HOTAS, Thrustmaster Cougar MFDs Airframes: A10C, A10CII, F/A-18C, F-14B, F-16C, UH=1H, FC3. Modules: Combined Arms, Supercarrier. Terrains: Persian Gulf, Nevada NTTR, Syria
randomTOTEN Posted November 2, 2020 Posted November 2, 2020 Sorry for the necro, but I have a question about takeoff trim. The chart shows 16 degrees for 44,000lbs and below, and 17 degrees for 45,000lbs and above. But there's a "dead" space between 44,000 and 45,000. Say, a weight of 44,500 for example. That's above 44,000 so it can't be 16 degrees, but it's also less than 45,000 so it can't be 17 degrees. What setting should weights in that "dead" space be set to? Thanks. Round up to the nearest 1,000lbs is how I would read that (pilots like to keep it simple... assuming heavier weight is more safe than assuming lighter weight than actual). So I round up 44,500 to 45,000 and set 17 ANU.
Curly Posted November 3, 2020 Posted November 3, 2020 Sorry for the necro, but I have a question about takeoff trim. The chart shows 16 degrees for 44,000lbs and below, and 17 degrees for 45,000lbs and above. But there's a "dead" space between 44,000 and 45,000. Say, a weight of 44,500 for example. That's above 44,000 so it can't be 16 degrees, but it's also less than 45,000 so it can't be 17 degrees. What setting should weights in that "dead" space be set to? Thanks. The Take off trim system on the Hornet is unique. The trim system bias the feed forward integrator to capture a specific AOA, once the system detects weight off wheels. Pressing the takeoff trim button sets the bias to 4 degrees of Angle of Attack. The carrier takeoff trim settings of 16 to 19 degrees, sets the system to capture 12 degrees of AOA. The system is designed to pitch the aircraft at a rate of 12 degrees per second, a form of auto rotation, once the weight is off the wheels. With increased gross weight, additional trim is required to get the aircraft to rotate. The system is limited to 12 degree AOA capture. Trim above the recommend settings for a given weight, will just increase the rate of rotation once weight is off wheels. This could cause AOA overshoots and pitch rates that are uncomfortable. Setting the trim below the recommended setting will cause excessive sink rates off the bow and slow AOA capture. Full flaps carrier takeoff with half flap trim setting present a different problem. Increased pitching moments, resulting in rapid over rotation and AOA overshoot. Half flap was chosen as the recommend setting because the benefit of full flaps catapult take off ( lower catapult end speeds) did not weigh concerns about sink off bow or auto rotation issues. Just as an FYI the field trim setting will always require you to pull back to rotate the aircraft. The trim capture is mentioned in the NATOPS sections 14.1 emergency carrier takeoff.
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