outbaxx Posted February 18, 2018 Share Posted February 18, 2018 I can’t take off without getting a high alpha warning. Even with a clean ac @70%fuel I will trigger the warning. The ac won’t react to stick input below 280-ish kmph and even if I have a very small stick input when I hit this speed I will get a warning as soon as I get close to airborne. So my questions are: -How do I take off without triggering a high alpha warning? -Why doesn’t the aircraft react to stick input before 280-ish kmph? When I read the take off diagrams I see no reason for this. Regards F Link to comment Share on other sites More sharing options...
Holton181 Posted February 18, 2018 Share Posted February 18, 2018 I also used to get the warning every time (nose like just popped up) untill I tried another joystick. It turned out to be too low resolution on my first one (no problems flying helicopters with it though). Or that's my explanation to it anyhow. Helicopters and Viggen DCS 1.5.7 and OpenBeta Win7 Pro 64bit i7-3820 3.60GHz P9X79 Pro 32GB GTX 670 2GB VG278H + a Dell PFT Lynx TrackIR 5 Link to comment Share on other sites More sharing options...
outbaxx Posted February 18, 2018 Author Share Posted February 18, 2018 Hmm, I’ve seen a sort of hud that show your stick inputs, how do I activate that? Link to comment Share on other sites More sharing options...
Holton181 Posted February 18, 2018 Share Posted February 18, 2018 RCtrl + Enter Helicopters and Viggen DCS 1.5.7 and OpenBeta Win7 Pro 64bit i7-3820 3.60GHz P9X79 Pro 32GB GTX 670 2GB VG278H + a Dell PFT Lynx TrackIR 5 Link to comment Share on other sites More sharing options...
outbaxx Posted February 18, 2018 Author Share Posted February 18, 2018 Awesome, thank you!! Link to comment Share on other sites More sharing options...
Nealius Posted February 18, 2018 Share Posted February 18, 2018 I've been having this issue as well. Sudden and abrupt nose up attitude, nearly tail-striking, and high-alpha warning plus buffeting from very little aft stick. Link to comment Share on other sites More sharing options...
Zabuzard Posted February 18, 2018 Share Posted February 18, 2018 (edited) Tbh, never had that problem. What joystick do you use? I have the TM Warthog which is expensive but therefore allows very fine adjustments. You need to be careful on your input. Is your procedure right? Try to not use afterburner if the runway is not super short. Begin to slowly pull at around 280, youll lift at around 300 then. Did you set nose trim correctly? 3 deg with weapons. Follow the indications on the HUD. It shows when to pull (time line) and where to place the FPM (pole tracks) with or without afterburner. But I think youre just to hard on the input. Maybe not your fault if the stick doesnt allow that resolution. Axis settings could help then. Edited February 18, 2018 by Zabuza Link to comment Share on other sites More sharing options...
Weegie Posted February 18, 2018 Share Posted February 18, 2018 I think it's a pretty common problem, even John in the Nav Video tail struck it's VERY easy to do Bit of practice and being slow and gentle with the stick help but you need a good stick with good resolution to really prevent it. As said already might not be you might be your stick. Trimming and axis curves can help a lot Oh and don't get too despondent, I saw a YouTube video somewhere of a cockpit view in the real thing and the pilot got a High Alpha warning as he lifted.........just saying!! Link to comment Share on other sites More sharing options...
RockinEmu Posted February 18, 2018 Share Posted February 18, 2018 Trim and speed. I haven't had problems since I started to trim at least +3 on the pitch trim and pay attention to the HUD on the take-off roll, it practically flies itself off the runway. 6800k @ 3.9 Ghz, 32GB RAM, 1080Ti, 1TB 960 Evo Link to comment Share on other sites More sharing options...
Nealius Posted February 18, 2018 Share Posted February 18, 2018 Trim +3? I recall the guides saying -3. I usually have trim set -3, full burner, aft stick when the rotation cue in the HUD comes up. Link to comment Share on other sites More sharing options...
2-niner Posted February 18, 2018 Share Posted February 18, 2018 What works for me is to pull back very hard and then immediatly releasing to almost neutral. This makes the nose wheel "unstick" from the tarmac and rotates the aircraft just enough to get you a little bit of alpha but not enough to trigger the warning and then you just have to very gently adjust the alpha from there to get it to be just enough to take off and just shy of triggering the warning. Takes some practice to get it right and this is probably not how they do it in real life :) Link to comment Share on other sites More sharing options...
Hoffster Posted February 18, 2018 Share Posted February 18, 2018 One or 2 beeps is not a problem in real life either, it gives you an indication that it is working. For me it does that when rotating properly to the upper SI poles. Just as stall warnings is common on touchdown in real life aviation. Link to comment Share on other sites More sharing options...
BadHabit Posted February 18, 2018 Share Posted February 18, 2018 I can’t take off without getting a high alpha warning. Even with a clean ac @70%fuel I will trigger the warning. The ac won’t react to stick input below 280-ish kmph and even if I have a very small stick input when I hit this speed I will get a warning as soon as I get close to airborne. So my questions are: -How do I take off without triggering a high alpha warning? -Why doesn’t the aircraft react to stick input before 280-ish kmph? When I read the take off diagrams I see no reason for this. Regards F I always use the trim for T/O and I almost never touch the stick in the roll. Fuel tank,2 x 24's, 2 x rb's for ex. ac trimmed to 5 degrees, 2 stage AB and ac lifts it self. "These are not the bugs you are looking for..":pilotfly: [sIGPIC][/sIGPIC] My YouTube channel SPECS -AMD FX8370 8 Core Processor 4.2 ghz -GIGABYTE 970A-UD3P -GTX 1050 TI Windforce 4g -16 GB RAM -Saitek X 52 -FaceNOIRtrack - 3 point clip Red Led Link to comment Share on other sites More sharing options...
Zabuzard Posted February 18, 2018 Share Posted February 18, 2018 For normal takeoff no AB is used. If the runway is shorter than usual stage 2 AB is used. Use stage 3 for very short takeoffs but be aware of the fact that you only have a small time window then to takeoff before you are faster than the allowed speed for the tires. The manual describes this well and also warns about that risk. The HUD has references for both, with and without AB takeoff. Link to comment Share on other sites More sharing options...
RockinEmu Posted February 18, 2018 Share Posted February 18, 2018 Trim +3? I recall the guides saying -3. I usually have trim set -3, full burner, aft stick when the rotation cue in the HUD comes up. Indeed the documentation does say -3, but it's 3° nose up trim. Which I would call +3 trim, as it incurs positive pitch. But we can talk force vectors and shit all day. As long as you trim nose up, you're good. 6800k @ 3.9 Ghz, 32GB RAM, 1080Ti, 1TB 960 Evo Link to comment Share on other sites More sharing options...
Nealius Posted February 19, 2018 Share Posted February 19, 2018 I need to double check the trim gauge and my controls setup. Pressing aft trim makes the trim gauge needle go below zero, making me think that it's indicating -3. Not sure if that's accurate, or if the positive/negative pitch vs. positive/negative trim semantics are confusing me. Link to comment Share on other sites More sharing options...
Nealius Posted February 19, 2018 Share Posted February 19, 2018 Tried again, something doesn't feel right: Center-line tank, half-load of bombs, trim 3° nose up, 2nd stage burner, rotate at 250kmph, which seems to be after the timeline marker in the HUD. Between 250-300kmph I have to maintain 15 units of AoA just to keep from smacking down onto the runway, with the alpha warning blaring at me. It isn't until I get through 300kmph that I can actually climb out. Link to comment Share on other sites More sharing options...
outbaxx Posted February 19, 2018 Author Share Posted February 19, 2018 Tried again, something doesn't feel right: Center-line tank, half-load of bombs, trim 3° nose up, 2nd stage burner, rotate at 250kmph, which seems to be after the timeline marker in the HUD. Between 250-300kmph I have to maintain 15 units of AoA just to keep from smacking down onto the runway, with the alpha warning blaring at me. It isn't until I get through 300kmph that I can actually climb out. It doesn’t sound too far off actually, with that load and stage 2 your speed of rotation would be above 260km/h at +30C But I’m not sure about the high AoA. What if you use a clean AC ? A clean AC with 100% fuel weighs about 15000kg. At +30C your speed for rotation is 195km/h with max AB stage3. 180km/h at +15C. A really cold day -15C the chart show 165km/h but the minimum allowed speed for rotation is 180km/h. But I can’t rotate with an AC with 70% fuel below 250, it’s just not possible for me. If we look at max AB stage 2 the speed of rotation for clean AC 100% fuel is 240km/h at +30C and about 225km/h at +15C. Link to comment Share on other sites More sharing options...
Nealius Posted February 20, 2018 Share Posted February 20, 2018 (edited) This was at -1C in the ME, taking of from Vaziani so probably closer to -2 or -3C on the runway. I tried again on a Spring day, +18C, center-line tank only, AB Stage 2. The timeline marker on the HUD became obscured by the time I hit 200kmph, rotated at 250kmph, FPM slightly above the outer altitude poles on the HUD, maintaining 12 units AoA with a lot of buffeting, but no alpha warning, until 300kmph. From 300 to 400kmph I had to maintain 10 units AoA to keep the FPM around the outer altitude poles on the HUD. It didn't feel like the main gear left the runway until about 280kmph or so. Edited February 20, 2018 by Nealius Link to comment Share on other sites More sharing options...
Nealius Posted February 20, 2018 Share Posted February 20, 2018 What's weird with the Viggen (and Mirage) is that after rotation and waiting for the main gear to leave the ground, the aircraft wobbles so much it's almost scary. Link to comment Share on other sites More sharing options...
Eldur Posted April 4, 2018 Share Posted April 4, 2018 I know the α warning as well, but I just have to get more gentle on the rotation. But I constantly get it when approaching with AFK and that 15.5° setting as the AFK is very slow in setting the throttle. I tried to just ignore it hard by pulling out the CB knob for the α warning on the right hoof side of the cockpit - and it still goes off. So the CB and probably all the others which I didn't try are not functional as of yet. Interesting to see the Viggen is usually taken off without AB which is almost impossbile at the moment in DCS. Somehow the dry performance could be a bit higher... and I remember the devs saying that they're gonna work on it, but that's been a year ago already Link to comment Share on other sites More sharing options...
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