There is an interesting link on Welcome to Alan's Hobby, Model & RC FAQ Web Links which I found from Airfieldmodles web site (
http://www.airfieldmodels.com ).
http://homepages.ihug.co.nz/~atong/
Look under Aircraft Design. Airfoils, Pull-Pull Systems, Flight Trim & Static Thrust Calculator.
Boost tabs.
it is an archived page but worth the wait for it to load.
http://web.archive.org/web/200502121...oost-tabs.html