[NSRCA-discussion] Fw: Trim
Rcmaster199 at aol.com
Rcmaster199 at aol.com
Thu Dec 22 14:35:42 AKST 2005
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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