[NSRCA-discussion] Fw: Trim

[Rcmaster199 at aol.com]

I've done that after talking with Nat and it helps. 
 
I then added some more rudder span by adding a counterbalance on rudder,  and 
it helped some more. In essence, the vertical tail CP should be raised by  
adding vertical area (and span if possible) above the stab line. 
 
I was concerned that addition of the extra span on rudder would have  
adversely affected roll coupling with rudder, but didn't affect roll couple at  all.
 
Matt
 
In a message dated 12/22/2005 5:36:40 PM Eastern Standard Time,  
natpenton at centurytel.net writes:

Jim 
If the airplane goe to the gear in KE increase  the wing incidence and/or add 
a dorsal  fin.         Nat

----- Original Message ----- 
From:  _J.Oddino_ (mailto:joddino at socal.rr.com)  
To: _NSRCA Mailing List_ (mailto:nsrca-discussion at lists.nsrca.org)  
Sent: Tuesday, December 20, 2005 11:08  PM
Subject: Re: [NSRCA-discussion] Fw:  Trim


Aren't you going to tell us which direction  does what? 
 
wing higher = ? pitching moment with  yaw
more dorsal = ditto
more sub dorsal =ditto
 
Jim O
 
 

----- Original Message ----- 
From:  _Nat Penton_ (mailto:natpenton at centurytel.net)  
To: _NSRCA Mailing List_ (mailto:nsrca-discussion at lists.nsrca.org)   
Sent: Tuesday, December 20, 2005 5:06  PM
Subject: [NSRCA-discussion] Fw:  Trim


Things are getting a little slow so I decided  to forward this to the list.
 
----- Original Message -----  
From: _Nat Penton_ (mailto:natpenton at centurytel.net)  
To: _David Lockhart_ (mailto:DaveL322 at comcast.net)  ; _Dean Pappas_ 
(mailto:pappasfamily at pappasfamily.net)  
Sent: Thursday, November 24, 2005 12:22 AM
Subject: Trim



No one seems to understand the following. It  is not taught in Aero school 
and I have never seen it in print. Some of  our trim charts even have wing 
incidence re KE backwards.
 
The simple key to understanding the aerobatic  airplane is recognizing the 
fuselage has a nose down pitching moment when  yawed. This is why all pattern 
planes evolved to look  alike.
 
This is the force that balances, in KE, the  up elevator trim needed to fly 
straight and level. The force is present  though  in all attitudes when yawed.
 
The magnitude of the moment is determined by  the wing relationship to the 
fuselage. The moment can also be changed  by changing the fuselage shape i.e. 
adding a dorsal or  sub-dorsal.
                                                          Nat





 
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