posted on Jan, 23 2018 @ 06:47 PM
a reply to: F4guy
I disagree. Or maybe we are just saying but the same thing but from different sides.
The contrail factor is directly proportional to the propulsion efficiency. And greater propulsion efficiency will necessarily result in more of the
chemical energy in the fuel being converted into useful kinetic energy, and less being exhausted as waste heat.
The upshot is that the exhaust of a more efficient engine is cooler, and so it will be more prone to condensing before it gets mixed out into the
surrounding air. The observed contrail factors of engines with different bypass ratios (and hence different efficiencies) back this up.
on 23-1-2018 by Rob48 because: (no reason given)