I was running the new engine on my Yellow F-18 DF and noticed something for the first time. There is quite a bit of air volume that comes out of the glow plug hole on top of the fiberglass thrust tube. I've never really paid attention to this but is seemed like it could be something that would cause a slight decrease in thrust...

Has anyone ever done any modifcations to see what would happen if that hole was covered, ie a sliding cover or something..

Just wondering..

Cowdog