In article , Corky Scott says...

In the supplements section of the online version of Air&Space Magazine
is an article entitled "The Meredith Effect". There are two parts to
the article, the first is a synopsis by F.W. Meredith, B.A. of his so
named cooling system design which came from his "Note on the cooling
of aircraft engines with special reference to ethylene glycol
radiators enclosed in ducts." The second is a commentary written by
Lee Atwood who was lead engineer for North American when they designed
the P-51 Mustang.
MAJOR SNIP

Sounds very interesting be sure to keep us informed. I seem to remember that in
Hoeners book Fluid Dynamic Drag they did a study of the Me 109G and the thrust
from the exhaust added 140 lbs thrust .So I would think your on the right track.
I would think that somewhere there is probably some paper on the
prediction of exhaust thrust as a function of hp .Don't know for sure but it
wouldn't surprise me. Good luck.

See ya

Chuck S