We were just playing around with our springer angle, and this seems to be pretty close to what we are looking for.. This is exactly 50 degrees of angle. The bottom of the neck is exactly 28 inches to the floor, which should be an appropriate height. I realize there is NO load on it now and all preliminary calculations are approximate..
Bill in SC
It should handle fine at any speed over 5 or10 mph.. It might be a tad floppy at crawling speeds just as many high degree raked bikes are. I don't anticipate any problems whatsoever with the handling. I will make sure of a relative positive trail during the actual construction..
BB in SC