" Seems to me that noone really knows how to make an engine..."

Hmmmmm.... thems there are fightin' words son.

It's not surprising that responses to your post have been luke warm to say the least. FWIW, [link=http://modelenginenews.org/index.html]Ron's Site[/link], (the edu site you refer to above) is probably one of the most complete resources of model aircraft engine building that you can find on the web. Take the time to browse Ron's site and I think you'll have a different opinion.

Jeesh... if what you say is true, then I must have been dreaming when I thought I built these.

-Joe

http://www.geocities.com/joby1967200...-1/NGEZ-1.html