wildcolonialboy Posted April 1, 2015 Posted April 1, 2015 I'm in the second mission of the Su-27 campaign, and I go up to about 30k feet, and for some reason my aircraft seems unable to hold onto speed at that altitude. My nose is slightly up over the horizon to get some altitude, I'm just below afterburner engine power level and my speed keeps creeping down. I have to periodically push on the afterburner. What is going on? :(
Ktulu2 Posted April 1, 2015 Posted April 1, 2015 IAS (indicated airspeed) is a mesure of the ''effeciency'' or of how efficient your airframe is at a X speed. As air is less dense higher, your IAS will be lower for the same speed, as you need more speed to get the same lift as you had lower. Make sure you chek the true air speed if you want to compare with higher altitudes, but your speed is most likely higher than what you had before climbing. I only fly the F15, so I cannot help you as to where see the TAS in the '27 cockpit. I do DCS videos on youtube : https://www.youtube.com/channel/UCAs8VxtXRJHZLnKS4mKunnQ?view_as=public
mvsgas Posted April 1, 2015 Posted April 1, 2015 I'm in the second mission of the Su-27 campaign, and I go up to about 30k feet, and for some reason my aircraft seems unable to hold onto speed at that altitude. My nose is slightly up over the horizon to get some altitude, I'm just below afterburner engine power level and my speed keeps creeping down. I have to periodically push on the afterburner. What is going on? :( What speed are you trying to sustain or achieve? Can you maintain altitude without using AB? What is your weight? What weapons load out and fuel weight? To whom it may concern, I am an idiot, unfortunately for the world, I have a internet connection and a fondness for beer....apologies for that. Thank you for you patience. Many people don't want the truth, they want constant reassurance that whatever misconception/fallacies they believe in are true..
wildcolonialboy Posted April 1, 2015 Author Posted April 1, 2015 What speed are you trying to sustain or achieve? Ideally I'd like to be at about 400 knots. I'm about 80 kilometres out from enemy aircraft and I would like to have altitude and decent speed so that I have maximum energy for manoeuvring to avoid AMRAAMs, and can throttle up to supersonic to flee once I've sent a few long-range IR shots in their direction Can you maintain altitude without using AB? No, my speed just dribbles down to about 250 knots and then I switch on the AB to avoid it going even lower. At this point my nose is high just to try to maintain altitude What is your weight? What weapons load out and fuel weight? I'm not sure. I'm on full Su-27 loadout of 2 ECM pods, 2 x r-73, 2 x r-27et and 4xr-27er. I have unlimited fuel on atm (sorry, I know that's not good but I am fairly new and I'm trying to practice my air-to-air BVR tactics). Might the fact that the aircraft has not offloaded any weight by way of fuel consumption be what is holding me back from ordinary performance? I mean, I still would have thought it would be okay. My performance is inferior to a passenger airliner
wildcolonialboy Posted April 1, 2015 Author Posted April 1, 2015 What speed are you trying to sustain or achieve? Can you maintain altitude without using AB? What is your weight? What weapons load out and fuel weight? Just a quick update. I've found a sweet spot, I'm cruising at 26k feet and I seem to be able to maintain reasonable speed in the 450+ zone. My speed does gradually bleed off and I do need to regularly do a quick AB sprint to get it back up, but it is much more manageable now. I'm wondering if I messed something up before? Did I have the flaps on or something? I know that must sound ludicrously incompetent. I am getting better at this stuff though, I seem to be able to fly the aircraft from point A to point B, and occasionally even best an F-16
Exorcet Posted April 1, 2015 Posted April 1, 2015 The Su-27 displays speed in km/h, not knots. 400 km/h is about 200 knots, which would explain why the plane is struggling to fly. Cruise in the Su-27 should display a speed of 700, or perhaps more. IAS is shown in nav modes while TAS is shown in combat modes if I remember. Unlimited fuel can be problematic because the Su-27 holds 20,000 lbs internal. That's far more than you would do combat with. If you're using unlimited fuel, check that your fuel load is about 50%. Awaiting: DCS F-15C Win 10 i5-9600KF 4.6 GHz 64 GB RAM RTX2080Ti 11GB -- Win 7 64 i5-6600K 3.6 GHz 32 GB RAM GTX970 4GB -- A-10C, F-5E, Su-27, F-15C, F-14B, F-16C missions in User Files
wildcolonialboy Posted April 1, 2015 Author Posted April 1, 2015 The Su-27 displays speed in km/h, not knots. 400 km/h is about 200 knots, which would explain why the plane is struggling to fly. Cruise in the Su-27 should display a speed of 700, or perhaps more. IAS is shown in nav modes while TAS is shown in combat modes if I remember. Unlimited fuel can be problematic because the Su-27 holds 20,000 lbs internal. That's far more than you would do combat with. If you're using unlimited fuel, check that your fuel load is about 50%. When I was referring to knots, it was that I've been checking the external view (which has speed and alt at the bottom) to make sure I wasn't misinterpreting the aircraft instrumentation Thanks for the heads up about internal fuel, that does help though helpfully I won't need these training wheels for long. And thanks for the tip that combat modes show TAS as opposed to indicated
WildBillKelsoe Posted April 1, 2015 Posted April 1, 2015 perhaps you got your boards fanned out and forgot (I usually forget them) AWAITING ED NEW DAMAGE MODEL IMPLEMENTATION FOR WW2 BIRDS Fat T is above, thin T is below. Long T is faster, Short T is slower. Open triangle is AWACS, closed triangle is your own sensors. Double dash is friendly, Single dash is enemy. Circle is friendly. Strobe is jammer. Strobe to dash is under 35 km. HDD is 7 times range key. Radar to 160 km, IRST to 10 km. Stay low, but never slow.
Exorcet Posted April 1, 2015 Posted April 1, 2015 If this happens again, post a track. Even with full fuel, the Flanker should be able to fly at altitude. I double checked by loading the sim to be sure, and I could climb slightly at 380 knots with 80% RPM. WildBill might be right, with airbrake extended, I can't hold 400 knots at 30,000 ft. Awaiting: DCS F-15C Win 10 i5-9600KF 4.6 GHz 64 GB RAM RTX2080Ti 11GB -- Win 7 64 i5-6600K 3.6 GHz 32 GB RAM GTX970 4GB -- A-10C, F-5E, Su-27, F-15C, F-14B, F-16C missions in User Files
mvsgas Posted April 2, 2015 Posted April 2, 2015 Ideally I'd like to be at about 400 knots. I'm about 80 kilometres out from enemy aircraft and I would like to have altitude and decent speed so that I have maximum energy for manoeuvring to avoid AMRAAMs, and can throttle up to supersonic to flee once I've sent a few long-range IR shots in their direction No, my speed just dribbles down to about 250 knots and then I switch on the AB to avoid it going even lower. At this point my nose is high just to try to maintain altitude I'm not sure. I'm on full Su-27 loadout of 2 ECM pods, 2 x r-73, 2 x r-27et and 4xr-27er. I have unlimited fuel on atm (sorry, I know that's not good but I am fairly new and I'm trying to practice my air-to-air BVR tactics). Might the fact that the aircraft has not offloaded any weight by way of fuel consumption be what is holding me back from ordinary performance? I mean, I still would have thought it would be okay. My performance is inferior to a passenger airliner Tried last night. With jamming pods x2. R-73 x2, R27ET x 2, R-27ER x 4 at 9000 k of fuel. Did not used unlimited fuel. Took off, climb and I was able to maintain around 580 kph at 9280 meters with only 95% throttle and around 520 kph at 10100 meters. It might be the unlimited fuel. Or maybe weather conditions, not sure. To whom it may concern, I am an idiot, unfortunately for the world, I have a internet connection and a fondness for beer....apologies for that. Thank you for you patience. Many people don't want the truth, they want constant reassurance that whatever misconception/fallacies they believe in are true..
DarkFire Posted April 2, 2015 Posted April 2, 2015 Ideally I'd like to be at about 400 knots. I'm about 80 kilometres out from enemy aircraft and I would like to have altitude and decent speed so that I have maximum energy for manoeuvring to avoid AMRAAMs, and can throttle up to supersonic to flee once I've sent a few long-range IR shots in their direction No, my speed just dribbles down to about 250 knots and then I switch on the AB to avoid it going even lower. At this point my nose is high just to try to maintain altitude I'm not sure. I'm on full Su-27 loadout of 2 ECM pods, 2 x r-73, 2 x r-27et and 4xr-27er. I have unlimited fuel on atm (sorry, I know that's not good but I am fairly new and I'm trying to practice my air-to-air BVR tactics). Might the fact that the aircraft has not offloaded any weight by way of fuel consumption be what is holding me back from ordinary performance? I mean, I still would have thought it would be okay. My performance is inferior to a passenger airliner The Su-27 is probably the one aircraft in FC3 where unlimited fuel isn't that much of a concern. The internal fuel load of the Flanker is so huge that at efficient cruise conditions you could easily fly around for hours and not need to land. This also means that when fully loaded with fuel and weapons the thing handles very differently to how it does with say 33% fuel and fewer weapons mounted. Also, make sure that you don't have flaps lowered or airbrake extended. System Spec: Cooler Master Cosmos C700P Black Edition case. | AMD 5950X CPU | MSI RTX-3090 GPU | 32GB HyperX Predator PC4000 RAM | | TM Warthog stick & throttle | TrackIR 5 | Samsung 980 Pro NVMe 4 SSD 1TB (boot) | Samsung 870 QVO SSD 4TB (games) | Windows 10 Pro 64-bit. Personal wish list: DCS: Su-27SM & DCS: Avro Vulcan.
ShuRugal Posted April 3, 2015 Posted April 3, 2015 aside from what others have said about checking that flaps are retracted (the blue and orange buttons under the throttle on the left console. blue depressed indicates flaps are up), I always make sure that i begin all my climbs over 5km altitude with a minimum of 700kph IAS. If i want to go any higher than 8 km, I will level off around 7.5km, get supersonic, and climb up to my target altitude maintaining no greater than 100 m/s climb rate. Using this technique, I find that i am reliably able to get above 12kmwith full CAP loadout and 8-tons remaining fuel, and maintain supersonic speeds. best way to maintain speed at altitude is to ensure you get to altitude with excess speed. climb in AB, and only throttle back once you have leveled off. with a full payload, you can cruise at 8km on milthrust and maintain ~mach 0.9.
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