For the cooling, you see my openning into the firewall. I make an big bore into the below of the fuselage, where the belly scoop is situated. The hot air can exit into the fuselage, and through the side exhaust openning, and around the opening for the Keleos exhaust.
Take care that the up hot air can escape. In your case, the up hot air cannot escape, it forms an hot poached in the up part of the cowling. Do not forget that radials motor give of hot air around the complet cowling... This is my opinion, and experience about radials and cooling
But you make an good job, be continued...
Last edited by warbird04; 08-04-2017 at 11:46 AM.
Reason: ad last sentence