How do you do it and do you baffle all of them? I fly a number of gassers, mostly single cylinders with the engine protruding from the bottom of the cowl and have never felt the need to baffle them. Recently I was talking with a fellow club member and he said he baffles all of his gassers whether the head is exposed to free air or not. Since I am fixing to build a 35% plane with a 100cc twin (yet to be purchased) I am interested in the proper way to ensure it doesn't overheat. I'm also curious if I have been treating my single cylinder engines wrong all this time. Engine manufacturers never include any information regarding this important matter with their engines, and when you contact them, they tend to be a little evasive in their answers.

All input is appreciated, but experienced input is preferred. Picture examples would be great.