wing tip shape (now Knife Edge Trimming!)

[Ted Sander]

Geez, this subject just keeps morphing!  Matt caused it! <grin>

 I swept away the wreckage of my Funtana 90 to work on my new wing today.
The story was:

2 ½ flights on this new ARF this past summer.  Generally very nice flyer,
except there was modest roll and a tremendous amount of down (wheels) pitch
with rudder.  Flutter got me coming out of a stall turn (horns were a tad
too short as compared to servo arms), stripped both aileron servos.  Cut the
throttle, and tried to make a flat left turn back to the field.  Plane
pitched down radically, I pulled up in reaction, you can guess the rest



 

I knew I should have mixed in a lot of up to rudder.  But what would have
been valid mechanical changes to trim out the pitching?  Lower the stab?
Play with incidence (verticals were pretty straight)?  I might even buy
another, and be more conservative in setup – but only if there are some ways
to tackle the pitching problem beyond mixing.  Any advice?

 

Ted

 

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On
Behalf Of Rcmaster199 at aol.com
Sent: Friday, November 26, 2004 12:28 PM
To: discussion at nsrca.org
Subject: Re: wing tip shape (now surface hinging)

 

NO!!! REALLY???? GEEZ I DIDN'T KNOW THAT (jus' kiddin' Keith, and pokin' a
little fun)

 

With the kind of geewhiz programmability available nowadays, too many of us
have become a little complacent and use the electronic fixes as cure alls. I
am old school and prefer to make the mechanical set-up as sound as possible
first, then use the radio to trim the mechanical set-up if needed. If it
needs more than a few percent electronic fixing, I usually re-do the
mechanical set-up in my pattern models. I do not subscribe to electronic
fixes for everything! (Sport planes are another matter)

 

Having to electronically fix knife edge flight for example, just frosts me,
particularly when a kit costs over $1000 in some cases. 

 

MattK

 

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