In this interview on Autosport.com
http://www.autosport.com/news/report.php/id/89968
Ross Brawn says that preformance -wise exhausts' impact will be comparable to duoble decker's impact. I don't know if it is the usual pr stuff for the press or something he 100% believes; still it is interesting to note is position.
@ringo: the situation described on
marekk post is not that different, because you are mainly interested with the difference in speed between exhaust and outside flow.
We have already discussed a bit about speed, but we still need now to get a more precise esteem of the order of magnitude of the energy contained in the exhaust. Every body in the interviews, including Brawn, talks about this "energy": we agree that it is there, but how much is it? What part of it is exploitable? How will the ejection effect work? Is merc trying to use a blown flap/Coanda effect?
Agree with
ringo that is not that important to baptise exhaust as a jet, but as
raptor22 wrote that it is not a jet, and that he knows well how such things behave, I wanted (and still wanting) him to share something with us, so that we can build some fixed points in the discussion by giving some reasonable answers to the first questions, and then move on to the next.