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I have to disagree.
A low or medium bypass turbofan required a much narrower window to leave contrails and have them be persistent.
No. If the humidity is that high, both will produce contrails. Those are not marginal conditions.
And there are times when a high bypass turbofan is leaving a contrail where the atmosphere is close to saturation, where an older engine wouldn't leave a contrail at all.
Contrails can form and develop into cirrus clouds when T < −39°C and Rhi > 100% because, in many instances, aircraft exhaust temporarily raises the local Rh above 100% as it mixes with the ambient air causing nucleation of liquid droplets that freeze instantly. Therefore, contrails can add to the natural cirrus coverage when T < −39°C and Rhi > 100% and no natural cirrus cloud is already present (Fig. 1). If Rhi < 100%, contrails can form but will not persist.
originally posted by: Zaphod58
a reply to: Phage
Ok, you know, you're right. Again. High bypass turbofans don't leave more persistent contrails than older engines.
originally posted by: RainbowPhoenix
a reply to: ignorant_ape
Well when you respond to me in a arrogant and condescending tone I'm not apt to take anything you say seriously. So try again in a polite manner while making a clear and consise argument and perhaps I will entertain your opinion. Have a great day