---------------------------------------------------------- Pietenpol-List Digest Archive --- Total Messages Posted Wed 01/18/17: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:15 AM - Re: Re: Vertical Offset w/Corvair (Charles N. Campbell) 2. 04:31 AM - Re: Re: Vertical Offset w/Corvair (Charles N. Campbell) 3. 07:48 AM - Re: Vertical Offset w/Corvair (jarheadpilot82) ________________________________ Message 1 _____________________________________ Time: 04:15:56 AM PST US From: "Charles N. Campbell" Subject: Re: Pietenpol-List: Re: Vertical Offset w/Corvair Oscar, why not make you some new L-shaped brackets to go on the top rear of the vertical stabilizer and twist them the correct number of degrees. That way the vertical piece in the stabilizer would not be twisted at all. Chuck On Tue, Jan 17, 2017 at 10:58 PM, taildrags wrote: > > So let's think about this. We're above Rick's airplane looking down on it > as he's flying. The nose wants to pull to the right, so Rick is applying > left rudder to keep the airplane going straight. As he presses left > rudder, the cable on that side pulls the port side rudder horn and the > rudder deflects to port, which causes the tail to swing to starboard and > bring the nose straight. Looking down on the airplane, it rotates > counter-clockwise to bring the nose straight. > > So what do we have to do to the leading edge of the vertical stabilizer to > get that same counter-clockwise rotation? We offset it to starboard so > that more of the port side is presented to the relative wind, 'pressing' > the tail to starboard. The LE of the vertical stabilizer on my airplane, > which has a Continental engine that rotates in the opposite direction from > the Corvair, is offset 1/2" to the port side but still needs a small rudder > trim tab. I think 3/4" offset would have been better, but I worried about > twisting the vertical stabilizer beam too much by doing that. > > There is a picture of the offset on my LE here: > http://forums.matronics.com//files/img_1848_571.jpg > > -------- > Oscar Zuniga > Medford, OR > Air Camper NX41CC "Scout" > A75 power, 72x36 Culver prop > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=465177#465177 > > ________________________________ Message 2 _____________________________________ Time: 04:31:57 AM PST US From: "Charles N. Campbell" Subject: Re: Pietenpol-List: Re: Vertical Offset w/Corvair Oscar, I just drew a diagram and did a bit of trig. The angle yopu would have to twist the vertical brackets would be 1.4 degrees. Chuck On Tue, Jan 17, 2017 at 10:58 PM, taildrags wrote: > > So let's think about this. We're above Rick's airplane looking down on it > as he's flying. The nose wants to pull to the right, so Rick is applying > left rudder to keep the airplane going straight. As he presses left > rudder, the cable on that side pulls the port side rudder horn and the > rudder deflects to port, which causes the tail to swing to starboard and > bring the nose straight. Looking down on the airplane, it rotates > counter-clockwise to bring the nose straight. > > So what do we have to do to the leading edge of the vertical stabilizer to > get that same counter-clockwise rotation? We offset it to starboard so > that more of the port side is presented to the relative wind, 'pressing' > the tail to starboard. The LE of the vertical stabilizer on my airplane, > which has a Continental engine that rotates in the opposite direction from > the Corvair, is offset 1/2" to the port side but still needs a small rudder > trim tab. I think 3/4" offset would have been better, but I worried about > twisting the vertical stabilizer beam too much by doing that. > > There is a picture of the offset on my LE here: > http://forums.matronics.com//files/img_1848_571.jpg > > -------- > Oscar Zuniga > Medford, OR > Air Camper NX41CC "Scout" > A75 power, 72x36 Culver prop > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=465177#465177 > > ________________________________ Message 3 _____________________________________ Time: 07:48:47 AM PST US Subject: Pietenpol-List: Re: Vertical Offset w/Corvair From: "jarheadpilot82" Oscar, Excellent explanation. Very clear, logical, and concise. Nicely done. Chuck, Again, how old are you? I am 59 and I have forgotten how to spell Trig, much less do it. You are my hero, and I want to be like you when I grow up. But being a professional air line pilot, I may never accomplish that (grow up, that is.) [Wink] [Laughing] -------- Semper Fi, Terry Hand Athens, GA Read this topic online here: http://forums.matronics.com/viewtopic.php?p=465187#465187 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message pietenpol-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Pietenpol-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/pietenpol-list Browse Digests http://www.matronics.com/digest/pietenpol-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.