Cooling air outlet?

[Basketcase]

Assuming there is plenty of air intake. (dangerous, I know :p ) What is the best way to get the air out of the plane?

I have a Switchback and the front of the cowl is open but there is no real outlet for the air. I am thinking of putting a hole in the bottom behind the wing. Then it could cool the motor, esc and batteries.

Would it be effective to use a NACA duct backwards or will it still pull air in? Would a scoop (like a plastic spoon) facing back on the outside help? Can just a big gaping hole be the best, if most unsightly, cooling possibility?

Any advice appreciated.

Thanks in advance.

BC

[2NG]

hello BC,

I have found that by making a hole in the bottom of the airplane, keeps the systems and the power from lowering the excessive heat that it generates during flight.

[2NG]

Ohh!! the bigger cut on the bottom of the fuse, is a door to the battery hatch, that I made to modify the Piper Cub 400EP.

-genovia:D

[Dave Robelen]

Hi Basketcase,
I am fond of a spoon like scoop on the front bottom of the nose for an inlet. An opening toward the rear of the cabin is a very good deal to insure flow. The most effective location is just behind the wing TE, with the second option the bottom of the cabin. The above would be dealing with a high wing plane, with the Switchback I would open up a cooling hole in the tail cone bottom that is not blocked by an internal bulkhead. Getting the expanding hot air out does require a fairly decent flow and opening size.
Regards, Dave