November 30, 20241 yr During the only (3) flights I have made with FS2024 where I climbed to above FL360 I witnessed an unusual OAT change of -10°C in only 2,000 ft of climb to FL380. -49°C to -59°C. Normal OAT lapse rate is -2°C per 1,000 ft. so that rate of change is highly unusual. After FL380 I then see OAT stay the same or even gain back a degree on up to FL420. It should continue to go lower. In the Hjet I am also seeing a spike in fuel burn in that narrow altitude range. The aircraft model has not changed. Burn in that altitude band/range appears to be +8% over MS2020. Anyone seeing similar experience with OAT and burn rate with any aircraft in that altitude band? Edited November 30, 20241 yr by fppilot Frank Patton Corsair 5000D Airflow Case; MSI B650 Tomahawk MOB; Ryzen 7 7800 X3D CPU; ASUS RTX 4080 Super; NZXT 360mm liquid cooler; Corsair Vengeance 64GB DDR5 4800 MHz RAM; RMX850X Gold PSU;; ASUS VG289 4K 27" Display; Honeycomb Alpha & Bravo, Crosswind 3's w/dampener. Former USAF meteorologist & ground weather school instructor. AOPA Member #07379126 "I will never put my name on a product that does not have in it the best that is in me." - John Deere
November 30, 20241 yr Off topic, but FL420 doesn't exist. After 410 comes 430. i7-13700KF, 32gb DDR4 3200, RTX 4080, Win 11, MSFS 2024
November 30, 20241 yr Author 16 minutes ago, Dave_YVR said: Off topic, but FL420 doesn't exist. After 410 comes 430. Yep. But today I flew at 42,000 while testing to stay under "low fuel temp warning" in the Hjet. Frank Patton Corsair 5000D Airflow Case; MSI B650 Tomahawk MOB; Ryzen 7 7800 X3D CPU; ASUS RTX 4080 Super; NZXT 360mm liquid cooler; Corsair Vengeance 64GB DDR5 4800 MHz RAM; RMX850X Gold PSU;; ASUS VG289 4K 27" Display; Honeycomb Alpha & Bravo, Crosswind 3's w/dampener. Former USAF meteorologist & ground weather school instructor. AOPA Member #07379126 "I will never put my name on a product that does not have in it the best that is in me." - John Deere
November 30, 20241 yr Yes, it is quite possible. Looking at the upper air winds and temperature forecast over KIAH right now in Foreflight, it shows -52C at FL360 and -61C at FL390, which is ISA -4. Such rapid temperature drops at high altitude are actually more common in winter at more southerly locations than northerly. Right now the upper air temp at my location (Elmira, NY) is -48C at FL390, which is ISA +9. Jim BarrettLicensed Airframe & Powerplant Mechanic, Avionics, Electrical & Air Data Systems Specialist. Qualified on: Falcon 900, CRJ-200, Dornier 328-100, Hawker 850XP and 1000, Lear 35, 45, 55 and 60, Gulfstream IV and 550, Embraer 135, Beech Premiere and 400A, MD-80.
Create an account or sign in to comment