Thanks WT! The problem I'm up against is that these babies are streamlined and the cowling has almost no exposed forward surface area. They just go from the spinner smoothly back to the fuse. With the point of all this being to keep from chopping obvious holes in the cowling, I'm having trouble figuring out the airflow issue. I've even used "flying" cowlings with holes cut in them on some of my planes for air shows and made a second "static" cowling with no holes for mall shows and the like. Here again, have you ever tried to get spare cowlings for these birds??? Thanks again for your input.

Dave