The plane is actually very light (10lb, 2oz), propped down 15x11x4, and the CG is on the aft limit ( nearly hands off inverted)<BR><BR><B><I>"Koenig, Tom" <Tom.Koenig@actewagl.com.au></I></B> wrote: <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"> <META content="MSHTML 6.00.2800.1106" name=GENERATOR> <DIV><SPAN class=573513321-11092006><FONT face="Comic Sans MS" color=#0000ff>All-Dean,</FONT></SPAN></DIV> <DIV><SPAN class=573513321-11092006><FONT face="Comic Sans MS" color=#0000ff></FONT></SPAN> </DIV> <DIV><SPAN class=573513321-11092006><FONT face="Comic Sans MS" color=#0000ff>I think you could be onto something there. I like to fly on the edge of nose heavy, and I could sympathize with Colin. My Synergy exhibits almost the same tendencies. It is not a heavy plane at 4.7 kg, but the CG is forward. Hmmmmmmm-you boys have me thinking again. I notice it biggest when travelling as every field I go to is
at lower altitude. The biggest and costliest time was during the Trans Tasman comp in New Zealand-it was like flying through soup!</FONT></SPAN></DIV> <DIV><SPAN class=573513321-11092006><FONT face="Comic Sans MS" color=#0000ff></FONT></SPAN> </DIV> <DIV><SPAN class=573513321-11092006><FONT face="Comic Sans MS" color=#0000ff>I have always assumed it was an air density thing. I have experienced exactly what Colin describes.</FONT></SPAN></DIV> <DIV><SPAN class=573513321-11092006><FONT face="Comic Sans MS" color=#0000ff></FONT></SPAN> </DIV> <DIV><SPAN class=573513321-11092006><FONT face="Comic Sans MS" color=#0000ff>Tom</FONT></SPAN></DIV> <DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma size=2>-----Original Message-----<BR><B>From:</B> nsrca-discussion-bounces@lists.nsrca.org [mailto:nsrca-discussion-bounces@lists.nsrca.org]<B>On Behalf Of </B>Dean Pappas<BR><B>Sent:</B> Tuesday, 12 September 2006 3:36 AM<BR><B>To:</B> NSRCA Mailing
List<BR><B>Subject:</B> Re: [NSRCA-discussion] Trimming question.<BR><BR></FONT></DIV> <DIV><SPAN class=571581117-11092006><FONT face=Arial size=2>Hi Colin,</FONT></SPAN></DIV> <DIV><SPAN class=571581117-11092006><FONT face=Arial size=2>By any chance, is your plane relatively heavy, have a particularly high wing loading, propped to fly very slowly, or set up relatively nose-heavy?</FONT></SPAN></DIV> <DIV><SPAN class=571581117-11092006><FONT face=Arial size=2>The reason I ask is that back in the late eighties, I clipped the wings of one of my early Turnaround designs </FONT></SPAN><SPAN class=571581117-11092006><FONT face=Arial size=2>in order to fly faster.</FONT></SPAN></DIV> <DIV><SPAN class=571581117-11092006><SPAN class=571581117-11092006><FONT face=Arial size=2>This was back when we were in the middle of a wild overcorrection from flying slow and small in this country to flying fast, fast, fast! Then things started to settle
down.</FONT></SPAN></SPAN></DIV> <DIV><SPAN class=571581117-11092006><FONT face=Arial size=2>Actually, I clipped it twice, once from 68" span to 64" and then to 60. I should have left the plane at 64" span. When I made the second clip, the plane developed </FONT></SPAN></DIV> <DIV><SPAN class=571581117-11092006><FONT face=Arial size=2>almost the same </FONT></SPAN><SPAN class=571581117-11092006><FONT face=Arial size=2>symptom you described. It pulled to the canopy in the vertical down line when the elevator was trimmed for a hot day.</FONT></SPAN></DIV> <DIV><SPAN class=571581117-11092006><FONT face=Arial size=2>It also looked like it flew droopy-drawered (tail low) on hot days. I moved the CG back until the elevators looked like they were in exactly the same spot, and lived with what little was left.</FONT></SPAN></DIV> <DIV><SPAN class=571581117-11092006><FONT face=Arial size=2>There was no suitable electronic fix back then, with either a Futaba PCM
512 or a JR PCM9.</FONT></SPAN></DIV> <DIV><SPAN class=571581117-11092006><FONT face=Arial size=2>My hypothesis is that the sensitivity to air density happens when the plane requires lots of "up" trim to fly. What do the elevators look like when trimmed on a hot day?</FONT></SPAN></DIV> <DIV><SPAN class=571581117-11092006><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=571581117-11092006><FONT face=Arial size=2>later,</FONT></SPAN></DIV> <div><FONT face="Times New Roman">Dean Pappas</FONT> <BR><FONT face="Times New Roman">Sr. Design Engineer</FONT> <BR><FONT face="Times New Roman">Kodeos Communications</FONT> <BR><FONT face="Times New Roman">111 Corporate Blvd.</FONT> <BR><FONT face="Times New Roman">South Plainfield, N.J. 07080</FONT> <BR><FONT face="Times New Roman">(908) 222-7817 phone</FONT> <BR><FONT face="Times New Roman">(908) 222-2392 fax</FONT> <BR><FONT face="Times New Roman">d.pappas@kodeos.com</FONT> </div> <BLOCKQUOTE> <DIV
class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma size=2>-----Original Message-----<BR><B>From:</B> nsrca-discussion-bounces@lists.nsrca.org [mailto:nsrca-discussion-bounces@lists.nsrca.org]<B>On Behalf Of </B>colin chariandy<BR><B>Sent:</B> Monday, September 11, 2006 9:53 AM<BR><B>To:</B> NSRCA Mailing List<BR><B>Subject:</B> Re: [NSRCA-discussion] Trimming question.<BR><BR></FONT></DIV> <DIV>No, I'm using the MK bellcrank.</DIV> <DIV> </DIV> <DIV>If the problem was only related to the length of the pushrods, then when I re-trim the knife edge performance should return to normal. Thats not the case. The plane pushes to the bottom in the cold and is dead straight on hot days.</DIV> <DIV> </DIV> <DIV>Colin.<BR><BR><B><I>Lance Van Nostrand <patterndude@comcast.net></I></B> wrote:</DIV> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"> <META content="MSHTML 6.00.2900.2963" name=GENERATOR>
<STYLE></STYLE> <DIV><FONT face=Arial size=2>My guess is you have the deps system. carbon fiber does not have as much shrinkage as the rest of your plane.</FONT></DIV> <DIV><FONT face=Arial size=2>--Lance</FONT></DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=cchariandy@yahoo.ca href="mailto:cchariandy@yahoo.ca">colin chariandy</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A title=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> Sunday, September 10, 2006 11:09 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> [NSRCA-discussion] Trimming question.</DIV> <DIV><BR></DIV> <DIV>I noticed recently that I
need to add a bit of down trim as the air temperature drops....maybe as much as 4 beebs going from 30+ days to 15C. That upsets the knife edge trim on the aircraft. </DIV> <DIV> </DIV> <DIV>Is that normal, or do I have something set a bit marginally, like CG or wing incidence?</DIV> <DIV> </DIV> <DIV>Do you guys typically have a "cold weather set-up" ?</DIV> <DIV> </DIV> <DIV>Colin.</DIV> <DIV> <HR SIZE=1> <A href="http://us.rd.yahoo.com/evt=40705/*http://mrd.mail.yahoo.com/try_beta?.intl=ca"><B>All new Yahoo! Mail - </B></A> <HR SIZE=1> Get a sneak peak at messages with a handy reading pane. <DIV> <HR> <DIV></DIV>_______________________________________________<BR>NSRCA-discussion mailing list<BR>NSRCA-discussion@lists.nsrca.org<BR>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</DIV></DIV></BLOCKQUOTE>_______________________________________________<BR>NSRCA-discussion mailing
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