Ailerons size

Fri Dec 20 09:33:43 AKST 2002

Hi Claude,

I think that cutting off 3" each tip may be excessive.  For instance, I have
an Advantage that weighs (give or take), 10.5 lbs.  I had the wing cut down
from 78.5" to 75" or so - I think we took off 1.75" from each tip.  My
Advantage snaps great, and is not a "floater", like one I've seen fly with
the 78.5" wing.  When I looked at 1.75" on a measring stick, it does not
look like much.  But, a 75" versus a 78.5" wing is a huge difference, and
you can tell.  My Phase One, which stats of such can be seen at
http://www.pub.nxs.net/dehunt/phase1.htm, basically has a 74" wing, and
weights less than 10 lbs.  This plane as well as my Advantage, have ailerons
that extend to the tips.  

What do you mean when you say, "you want it to snap better?"  What is it
doing?  On each of my planes planes, I flip 1 dual rate switch that combines
rates of rudder, elevator, aileron, and then perform the snap with the
sticks.  This is a poor-mans flight conditions, which sets up a state which
reduces the total rudder throw to 60% of what I use for a stall turn, about
70% of the elevator I normally fly with, and about 30% more aileron - Its
still a nice snap, but does not have so much rudder and elevator to "bury"
the plane.  With this, the planes does a nice 1.5 snaps and keeps on flying
afterward.  If I snap with the full rudder and elevator I fly with, the
plane does a viloent snap, "stops" forward momentum, and has a bigger
heading change. 

I'm not an expert - just my opinion.  Maybe an FAI flyer can chime in.  If
you decrease that much wing area, you might have to fly at a faster pace for
other manuevers, and the Omen is not a large fuse type of plane.  I think
that cutting off 6" is extreme - you might not be happy with the result.  
Jim W.

-----Original Message-----
From: george kennie [mailto:geobet at gis.net]
Sent: Friday, December 20, 2002 10:22 AM
To: discussion at nsrca.org
Subject: Re: Ailerons size

Claude,
Think about a fun-fly. Does a fun-fly snap? Like crazy, huh? Does a fun-fly
have big ailerons(surfaces)? I think you're probably getting the picture. If
you reduce the size of the ailerons, you'll defeat the reason you shortened
the wing. My recommendation would be to clip the wing(shoot for, right
around 1000 sq.inches. If it's a tad under it's still O.K.) and stick with
the original size ailerons.Stab area can also enter into the equation.
Remember all the guys, a few years back, enlarging  the stab of the Typhoon
and then discovering that the thing wouldn't snap or spin worth a darn.
There's more, but I don't want to come across as a know-it-all(even though
everybody allready knows that).Best of luck.
Georgie

"Weimer, Claude" wrote:

> -----Original Message-----
> From: Weimer, Claude
> Sent: Wednesday, December 18, 2002 11:02 AM
> To: discussion at nsrca.org
> Subject: Ailerons size
>
> I am in the process of building a second Omen and I am cutting three
inches off each win tip.  I am reducing the wing area thinking the airplane
will snap a little better.  I am asking for opinions on the ailerons. Should
I use the same aileron dimensions and just move the aileron inward? Or
should I cut three inches of the tip of the aileron and place it the same
distance out from the fuselage? Your thoughts on this will be appreciated.
>
> Claude Weimer
> NSRCA 946
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