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Contrails (or lack of them)

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Are contrails specific to certain aircrafts/altitudes/speeds? I was just surprised to see none behind my CJ4 last night:

AMD Ryzen 7 5800X on ROG CROSSHAIR VIIl DARK HERO (AM4), Asus ROG Strix GeForce RTX 3080 V2 OC and 32 GB Vengeance Pro Ram 3600MHz. DELL Alienware AW3420DW 3440x1440 and DELL U2414H

39 minutes ago, Espana Pete said:

Are contrails specific to certain aircrafts/altitudes/speeds? I was just surprised to see none behind my CJ4 last night:

Altitude and/or temperature. Check them by lowering the temperature to about -50 C

Edited by kt069

Intel i7-9700K - AMD 7900 XT (VRAM 20GB) - 32 Gb Ram - SSD Drive - Win10 x64 - Samsung 43" 4K TV - Quest 3 VR

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