John,

I'm not sure I follow what your concern is but maybe the photo below might clarify the cooling.

The engine installation is typical of inverted pattern engines except the pipe runs atop instead of under the wing as with other designs (e.g., Aurora). As you can see the frontal opening extends below the spinner to allow air into the carb as well as over the cylinder. The cowl is also open underneath where the cylinder exits exhausting the air. Depending on whether the fuse is glass or wood, the configuration changes slightly but the concept is the same.

David.