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<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>>
<BR>> <BR>>
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