Well I scaled up and printed a 24"span 135 inch area a-7 but if the hollow duct is still gonna be a lot of resistance I can tell that it would be better procrastinated into the 28"incher i printed and grow to a Hot .15 later. Maybe I should build the wing(seems to fit a lot of these era jets) and build my own fuse design or try something more p-80 like with a straighter wing and slimmer fuse. I thought the hollow tube would be mostly ineffective as far as drag...Todd