January 17, 20233 yr Today I had a flight on DA01(Dassault Mercure) from HJG by Mario NORIEGA, in P3Dv4.5hf3, with ASP3D, RealTrub(no CAT) and A2A accu-feel. The flight starts normal, all the way into Yunnan province in southwest China, as the terrain rise, the turbulence start to getting harsh, the Mercure start swing hard and sometimes over 30degree bank, AP is fighting for control. The DA01 seems much more effected by turbulence, "Normal" aircraft add-on like PMDG737 or FSL319 with similar weight would not do that, but somehow feelthere EJet also suffer such great swing when hit by "moderate" turb by ASP3D, it's not the AP as it also affect manual flying. Anyway, as the turbulence getting larger, I disconnected AP and manually fight it, I noticed as I swinging, IAS drop from about 280 down to ~240, I throttle up to MCT, but not able to gain back to 280. The turb once got me over 100degree bank, but I still managed to bring it back, then suddenly, even with speed well above 220 (speed have been dropped to 200 but not stall yet). I suddenly entered a spin: As recorded with Tacview: As I enter the spin, I thought with 20000 feel AGL it's enough to get out of it, but hell no, as you can see... As my own feeling from cockpit view, even if I somehow managed to point my nose down, the yaw will kicks in and veer me off up to 180degree so I can't gain any speed to recover, full rudder doesn't stop that, and I even tried differential thrust with no luck, very different from what I know about a spin.... Having doubt if I'm not capable to recover a spin, after the crash, I restart in same condition but with both PMDG737NGXu and iFly737, PMDG737, like what I have experienced in UPRT certified LvD 737 simulator, is almost unable to get into spin, just stall on straight, and Ifly737 can only get into a spin with heavy rudder kick and then it's very easy to recover by pointing nose down naturally. I also tried FJS732 in XP11, also very hard to get into spin and very easy to get out. I tried Mercure again w/ and w/o Accu-feel, it's almost same as the record, although it seems a little easier to recover w/o one, only marginally. I would say both are "nearly-unrecoverable". Also It's not the ice as it's not shown on FSCaptain. I had a Tu154 crash last winter in XP11 due to ice, these are the only 2 crash I had in civil flight sim with intention of just fly A->B (ofc we do all kings of "test flights" ended up badly, don't we?) in recent years. I'm not post this for "help", the mecure is a very old FSX port and still fly nicely in normal envelope, it's just a "diary" and share some novelty finding. Of course if someone know how to make it (and Feelthere EJets, in turbulence case) behave normaller, it would be nice.
January 17, 20233 yr That video feels kind of nostalgic, I have to say. That strange behavior is just a limitation of the FSX/P3D flight model. Your aircraft got out of the standard flight enveloppe (stall, aerobatic or such) and unfortunately that area of the flight domain was not supported by the AIR file of your aircraft, leading to inconsistent, out of physics behavior.
June 17, 20232 yr Author Maybe no one asking... but I find bu change the aircraft.cfg's hi_alpha_on_roll = 2 and hi_alpha_on_yaw = 2 under [flight_tuning] makes it at least recoverable after enter spin with like 5000' altitude loss.... and less like to start spin then, although the spin behavior is still as weird as before... BTW the Mercure fly beautifully in P3Dv5, I only have migrate it to my new v5 install today.
October 28, 20232 yr The HJG offered MERCURE 100 by Mario NORIEGA "is not" intended for use with (and by implication is not compatible with) P3D HJG offered products are FS9 and FSX compatible only
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