I tried those ‘gun ports’ hoping they would work - I guess your eyeball engineering is better than mine! I had to close those off and go with some small bluff body scoops, as seen on some WW2 big iron. These scoops seemed to attract our local mud dauber wasps, so I had to cover them with 1/8” hardware cloth. I ended up doing all the scoops as those wasps are very observant.
But one thing caught my eye: insulation on the inside of the firewall. Before Dan Horton pops in, did you do a burn test on the inner layer?
Also: don’t forget to let the air out. I added a reverse bluff body outlet on the aft inspection plate to help let the air out - I’m thinking of adding another. The aft PAX gets good air from the bluff body inlet in the inboard wing inspection panel (Evo wings on this one).
My plane is very warm no matter what - it is socks and shorts at 17500’ @ 5F. So, you can see what I am fighting at the lower altitudes. I added 2 ea bluff body scoops just behind the firewall, just above the upper longerons. One runs to the left eyeball; the other simply blows into the fwd area to keep the electronics happy. This ALMOST does the job.
Otherwise, I fly as high as practical here in Texas - trying to get some of that cooler air at altitude: generally 8500MSL at minimum. With the TCM 550 up front, I can get there rather quickly...
Formation work requires a bottle of water immediately after landing...maybe two... I do recall seeing the Dynon “greying out” during the first few flights when the ship was new - I had to fix that pronto as the pilot was also greying out..
Originally Posted by I-TERA
Standard rear seat : an eyeball ahead of the stick fed by an under wing NACA vent.
Front: two holes on the leading edges of the wing fairings, the right one fed an eyeball just under the corner of the panel, the left one fed a box, valve operated, putting air on pedals and electronic. The system do not suffer from the hot boundary layer around the cowling. A 30mm hole is enough.
A couple of knots before stall the two holes begins to bellow, an unexpected positive side effect!
To avoid excessive heat transfer from the motor side to the cabin, I installed a double insulation, internal and external on the FW.