Mike Arnold wrote: >Is there a specific thrust line in reference to the top longeron?
My Corvair engine sits about 2-3/8" below the longerons. This worked nicely to keep the intake manifolds and distributor just below the contour of the cowling, and smoothly integrated into the propeller's spinner. See the two photos at the bottom of http://www.n56ml.com/ for how it turned out, and http://www.n56ml.com/corvair/mount_fit.html for details of the mount and cowling relationship. This still gave me about 8.5" of clearance below the prop with a 54" diameter prop, using small 5x11.4" tires. Also, handling properties with throttle changes worked "as expected". Short of anything ridiculous, put it where it needs to go to optimize your engine's shape, while keeping over-the-nose visibility in mind, especially if you're building a tailwheel plane. And of course, weight and balance as far as the distance from the firewall. There's a new sunset photo at the top http://www.n56ml.com/sunsets/ , taken late yesterday after another great 1.5 hours in the KR2... Mark Langford ML at N56ML.com http://www.n56ml.com
