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<DIV>Claude, adding dihedral to a plug in wing shouldn't be that tough unless you are using a carbon tube. If ally, just bend it a bit, say maybe 2 degrees in the middle of the tube and lock it in place in the fuse do its doen't rotate.</DIV>
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<DIV>In one of Flying Models issues, Dean talked about that kind of situation where model pitched differently with either rudder. It's a tricky thing to fix but not that bad. Adding about 1/2" ventral below the stab would help.</DIV>
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<DIV>MattK</DIV>
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<DIV>In a message dated 10/19/2006 8:00:57 PM Eastern Standard Time, geobet@gis.net writes:</DIV>
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<DIV><FONT face=Arial size=2>Claude,</FONT></DIV>
<DIV><FONT face=Arial size=2>I have to confess that most of my opinions are based solely on the empiricle results of building my own designs and finding out through experience what works. I'm sure you're aware that "what works" for one individual is not always going to be "what works" for someone else. To demonstrate, in my opinion, the Eclipse you had with the stab at the 3/8" lowered point was as close to neutral as is possible with the design. If you have a plane that pulls with one rudder and pushes with the other that should be equalibrium and the mixes to trim this out should be in the 2% bracket. You can't see 2% ! When you raised the stab back up, the rudder that was pushing should have seen an amplification of that problem, so I would have to conclude that your "little adjustment" altered something additional to affect the aerodynamic effects involved.</FONT></DIV>
<DIV><FONT face=Arial size=2>I also like to see a design that requires as close to zero mix as possible, but as you are aware there are many many variables to overcome and aesthetics can often</FONT></DIV>
<DIV><FONT face=Arial size=2>complicate desirable characteristics to the point of compromise. </FONT></DIV>
<DIV><FONT face=Arial size=2>The numbers I quoted are nothing more than good sounding measurements based on the limited info available. It really gets a lot more detailed than can be resolved without actually seeing the airplane and doing some actual measuring, however, the dihedral thing is probably a real close guess.....and yes it's as tough to change as you think especially with plug in wings. Maybe a new set of cores with the proper tube angles would be the easiest......and yeah, I too like bantering the aerodynamic techie stuff (not that I'm all that qualified).</FONT></DIV>
<DIV><FONT face=Arial size=2>Regards,</FONT></DIV>
<DIV><FONT face=Arial size=2>Georgie</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=mailto:cweimer@tconl.com href="mailto:cweimer@tconl.com">Claude Weimer</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=mailto:nsrca-discussion@lists.nsrca.org href="mailto:nsrca-discussion@lists.nsrca.org">'NSRCA Mailing List'</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, October 18, 2006 10:22 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Partner set-up question</DIV>
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<P class=MsoNormal><FONT color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Hey George,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Are the dimensions you gave me what it takes to fix a Partner? Does a Partner roll in knife edge? I thought the Partners were pretty good. I can tell you I lowered the stab 3/8” on an Eclipse and it pushed to the gear with left rudder and to the canopy with right rudder. Dave Guerin just looked at the plane and said “the stab is too low” so I raised it the diameter of the stab tube (about 7/16”) and with a little adjustment it fixed it. I don’t have any mix in the airplane and it flies great. I am not a fan of mixing problems out if you can fix it with out mixing. Any way this experience really got me interested in these measurements. By the way how do you go about adding dihedral to plug-in wings? Is it as difficult as I think it is? Any way I find this kind of stuff more interesting than interrupting the judging criteria of a figure M.<o:p></o:p></SPAN></FONT></P>
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