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<DIV><FONT face=Arial size=2>Gorge Nat is correct, think about it this way. The
down deflected control surface produces more lift. lift = Drag. Lift
is the force that's opposes to gravity"</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Ken</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=natpenton@centurytel.net href="mailto:natpenton@centurytel.net">Nat
Penton</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.f3a.us
href="mailto:nsrca-discussion@lists.f3a.us">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, March 06, 2008 6:08
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] YS
Questions+more - Rolls</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>George, I believe the down aileron produces the
most drag ( re adverse yaw ), but, over half of our rolls occur in
verticals.</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=drykert2@rochester.rr.com
href="mailto:drykert2@rochester.rr.com">Del Rykert</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.f3a.us
href="mailto:nsrca-discussion@lists.f3a.us">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, March 06, 2008 2:11
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] YS
Questions+more - Rolls</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial color=#0000ff size=2>The general consensus has
been that the faster moving molecules over the top surface don't require as
big as a deflection as the aileron that deflects towards the bottom of
the plane. What one tries to achieve is the plane tracks as purely
straight on a string as possible while one rolls both directions
without introducing any yaw. </FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2> Del
</FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2>----- Original Message -----
</FONT>
<DIV><FONT face=Arial color=#0000ff size=2>From: <</FONT><A
href="mailto:glmiller3@suddenlink.net"><FONT face=Arial
size=2>glmiller3@suddenlink.net</FONT></A><FONT face=Arial color=#0000ff
size=2>></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2>To: "NSRCA Mailing List"
<</FONT><A href="mailto:nsrca-discussion@lists.nsrca.org"><FONT
face=Arial size=2>nsrca-discussion@lists.nsrca.org</FONT></A><FONT
face=Arial color=#0000ff size=2>></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2>Sent: Thursday, March 06, 2008
2:49 PM</FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2>Subject: Re: [NSRCA-discussion]
YS Questions+more - Rolls</FONT></DIV></DIV>
<DIV><FONT face=Arial><BR><FONT color=#0000ff
size=2></FONT></FONT></DIV><FONT face=Arial color=#0000ff size=2>> Nat
and all you other aerodynamicists,<BR>> <BR>> I thought that the
rational for "aileron differential" was that upward deflection causes more
drag than downward deflection so to equalize drag and prevent yaw with
aileron deflection, aileron differential is needed. It seems that you
guys are now saying that ain't so. Please elaborate.<BR>> <BR>>
George<BR>> <BR>> ---- Nat Penton <</FONT><A
href="mailto:natpenton@centurytel.net"><FONT face=Arial
size=2>natpenton@centurytel.net</FONT></A><FONT face=Arial color=#0000ff
size=2>> wrote: <BR>> <BR>> =============<BR>> IMO center hinged
or top hinged is OK. With top hinge, to achieve equal vertical travel of the
trailing edge requires different angular travel, up vs down. The objective
is zero aerodynamic differential.<BR>> <BR>> Ron I don't think a
fairing would prevent separation but, how are you able to fair the gap using
the top hinge
?
Nat<BR>> ----- Original Message ----- <BR>> From:
</FONT><A href="mailto:ronlock@comcast.net"><FONT face=Arial
size=2>ronlock@comcast.net</FONT></A><FONT face=Arial color=#0000ff size=2>
<BR>> To: NSRCA Mailing List <BR>> Sent: Thursday, March
06, 2008 7:20 AM<BR>> Subject: Re: [NSRCA-discussion] YS
Questions+more - Rolls<BR>> <BR>> <BR>> And while your at it,
I'd appreciate some discussion of the impact of the top hinge system as seen
on Viavat, and Prestige birds - (top hinged, with
fairing that eliminates the gap at deflection)<BR>> <BR>>
Thanks, Ron Lockhart<BR>> <BR>> --------------
Original message -------------- <BR>> From: </FONT><A
href="mailto:vicenterc@comcast.net"><FONT face=Arial
size=2>vicenterc@comcast.net</FONT></A><FONT face=Arial color=#0000ff
size=2> <BR>> <BR>> Nat,<BR>>
<BR>> Could you explain why the differential should be
different for non-center hinged? I understand that the mechanical
configuration of non-center hinged requires differential to obtain same
travel in both directions. However, the travel up and down should be
close to equal. <BR>> <BR>> Thanks,<BR>>
<BR>> --<BR>> Vicente "Vince"
Bortone<BR>> <BR>> --------------
Original message -------------- <BR>> From:
"Nat Penton" <</FONT><A href="mailto:natpenton@centurytel.net"><FONT
face=Arial size=2>natpenton@centurytel.net</FONT></A><FONT face=Arial
color=#0000ff size=2>> <BR>> <BR>>
Tom<BR>> It's just something that is
peculiar to the Southern Hemisphere.<BR>>
<BR>> Changing wing incidence will not
help. Unless things are really screwed up <G>, at our roll rates,
centrifugal forces are too low to cause a problem. You want zero
differential, aero speaking ( same up/down if center hinged ).<BR>>
<BR>> I find the best check is the fast
half-roll in the vertical up.
Regards
Nat<BR>> ----- Original Message
----- <BR>> From: Koenig, Tom
<BR>> To: NSRCA Mailing List
<BR>> Sent: Wednesday, March
05, 2008 7:24 PM<BR>> Subject:
Re: [NSRCA-discussion] YS Questions+more<BR>> <BR>>
<BR>> Hi Troy!<BR>>
<BR>> Thanks for the info. I
thought you would be toiling away on the next developmental stage of these
engines!!<BR>> <BR>>
Hopefully soon, I can find the time to get flying again. I am looking
forward to running this little beast. I am still a little concerned in
keeping it quiet though.<BR>>
<BR>> Four blade props? I have
some of the 18.1 x 12 two bladers but I just cant see how I'll shut the
thing up with these paint stirrers??<BR>>
<BR>> Also-one more question to
any of you out there in pattern land.<BR>>
<BR>> I have struggled with
aileron differential for years. I am just not happy with the rolls. I have
tried various design fixes-but about the only one that seems to work is to
get the wing back to 0-0 ( which can be achieved by a few ways, design, mix
or thumbs) Differential itself does not seem to work if the wing is POA (
well...it works for half the roll
!)<BR>> Another black magic fix
appears to be to run parallel ailerons-but this only 'sorta' seems to fix
it. I like the feel of equal% chord ailerons however.<BR>>
<BR>> I am frustrated with it-I
like my planes to roll as if they had a string up its ...........well you
know!<BR>> <BR>> OK-any
'secrets' I need to know??? Very good elevator work fixes it ( hence my 0-0
comment)<BR>> <BR>>
Tom<BR>> <BR>> <BR>>
------------------------------------------------------------------------<BR>>
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