Hotelima From France, joined May 2009, 24 posts, RR: 0 Posted (5 years 7 months 3 weeks 6 days 23 hours ago) and read 1622 times:
Looking at twin jets contrails produced by wing-mounted engines, I am surprised to see how some types of aircraft have divergent contrails (such as B 737 or A 320), and some ones rather convergent contrails such as B 757 and maybe A 310, if I am not mistaken.
Could anybody explain me some reasons that can explain why the same aircraft designer can choose either one or other ways of positioning engines on twin jets ?
AustrianZRH From Austria, joined Aug 2007, 1408 posts, RR: 0
Reply 1, posted (5 years 7 months 3 weeks 6 days 5 hours ago) and read 1409 times:
Could be due to the trailing wake of an aircraft. Different sweeps and profiles of the wing as well as size of the aircraft may influence the wake. If where the contrail appears you have a diverging wake, the contrails will be blown apart, if there is a converging wake, the contrails will converge as well. Furthermore, the engines should always be positioned in a way, such that the force vector of thrust is optimized, which can result in slightly different positioning of the engine. These, however, are just educated guesses!
And now the real reason: there are no contrails, just chemtrails, used for communication between the Roswell aliens, the Mossad, and Elvis. Different chems ==> converging or diverging chemtrails, different meanings!
WARNING! The post above should be taken with a grain of salt! Furthermore, it may be slightly biased towards A.