I guess I scanned Martin's email too quickly before, and missed that he was talking about the horizontal plane, rather than the vertical. I built my rudder with no offset because I wasn't positive that I was going to use a VW or Corvair. But the cure for that big Corvair engine was as simple as a 1" x 4" aluminum tab on the rudder with about a 25 degree bend on it. I'd guess that a 2-3 degree offset would be plenty to correct for it. As for yaw variations are various throttle settings, I never notice mine except at wide open on takeoff. The rest of the time I don't mess around with the rudder pedals unless on takeoff or landing, unless I do it subconsciously and don't notice, which is possible...
Mark Langford m...@n56ml.com see experimental N56ML at www.N56ML.com -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of Martin Pearce Sent: Monday, April 09, 2012 4:59 PM To: kr...@mylist.net Subject: KR> Thrust line offsets .... Does anyone have thoughts / experience with the best thrust line offset to use for the KR2? I have a suby motor with Redrive so the prop turns clockwise viewed from the cockpit. My engine mount appears to have close to 1 deg offset to the right built into it, but I have heard that 3 deg is likely to be closer to what is best. The a'c has a fixed rudder trim tab with quite a lot of right rudder bias (tab bent to the left) and, as I recall, there was a fair bit of yaw variation with throttle. Pitch changes with throttle seemed to be fairly minimal .... Would appreciate some guidance as I will soon be remounting the engine to the airframe .... Cheers Martin Pearce KR2 19 - 7814 rocketdri...@optusnet.com.au
