I'm trying to finish up the engine/cowl work on my 1/4 scale (73 inch) H9 Cap 232. However, nowhere in the manual can I find any info on engine position, IE, what should the firewall to prop-hub face distance be? Since the mount is slotted and adjustable, it's easy enough to set. Anybody got any data or just know what works well? Puttin' a Moki 1.8 on it.