Cowling, what i mean is that theres a tight figtting metal covering and allows the air to flow over more efficiently. So, mark burket of the spanish Swiss Company has designed a very important series of automobile engines in the prewar era. He adapts this to the aeronautical application by taking two of his inline four engines, makes it into a v8, and what he does thats very unique is instead of having separate cylinders attached to the crank case, he casts a row of cylinders out of a solid piece of aluminum. And he has cooling packagssages those aluminum blocks that allows improved cooling and more power. So instead of a rotary engine, you know, doing 110, 120 horsepower, youre looking at 200 or 220 horsepower with these engines by the time theyre introduced in the spad xii. Theres always a technological pushpull over the western front in world war i, in which the germans have an advantage with their thick air foiled tubular steel fuselaged aircraft like the folker d 7 that you can se