roll coupling (correction...)

[Lewis, Richard]

Can't type...the first link below should be...
 
http://users.ev1.net/~rwlewis/rcpictures/express/express with nat.jpg
<http://users.ev1.net/~rwlewis/rcpictures/express/express with nat.jpg> 
 

________________________________

From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Lewis, Richard
Sent: Friday, September 16, 2005 3:00 PM
To: discussion at nsrca.org
Subject: RE: roll coupling 


It's not ALL about the dihedral.  Many other variables like wing sweep,
rudder area distribution, vertical CG, fore-aft CG, fuselage side area
distribution, etc...effect roll coupling with rudder.  Most of these are
inhernet to the design and construction of the airframe, thus are
difficult to change.  Although form tends to follow function (hence many
similar looking pattern designs) most designers and pilots still want an
airplane that bears some resemblance to a "real" airplane (canopy, stab
locations/shape, wing planform, etc...) and thus most designs are less
than ideal from a neutrality and coupling standpoint.  Not to say you
can't tweak an conventionally shaped airframe to be totally neutral and
have no coupling, it just requires some trial and error and luck to get
the magic formula.
 
Richard
(Oh MY...I'm starting to sound like Nat)  see links below....
 
http://users.ev1.net/~rwlewis/rcpictures/epxress/express with nat.jpg
<http://users.ev1.net/~rwlewis/rcpictures/epxress/express with nat.jpg> 
 
http://users.ev1.net/~rwlewis/rcpictures/express/express maiden 03.jpg
<http://users.ev1.net/~rwlewis/rcpictures/express/express maiden 03.jpg>

 
________________________________

From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Atwood, Mark
Sent: Friday, September 16, 2005 12:54 PM
To: patternrules at earthlink.net; discussion
Subject: RE: roll coupling 



Dihedral.  It's ALL about the dihedral...  To much and you get pro-verse
coupling, too little and you'll get adverse coupling.  

 

Ever flown the old "Contender" kit??  Zero dihedral in the wing...push
hard right rudder and make a nicely banked left turn....lol

 

-Mark

 

________________________________

From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Steven Maxwell
Sent: Friday, September 16, 2005 12:53 PM
To: discussion
Subject: roll coupling 

 

 I was doing some changes to my plane the other day moved CG back a
little tested with a little more incedence, and no matter what I done it
requires aileron mix with rudder. I haven't found anything that explains
what needs to be changed to fix this, the mix is 12% and 15%.

 Any thoughts out there?

 

 

Steven Maxwell

 

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