Trimming Question

[Peter Pennisi]

Bob,
 
Model currently fly's with little to no mix rudder/elevator coupling.
Will changing wing incidence affect this much?
 

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Bob Pastorello
Sent: Monday, 18 August 2003 08:44 AM
To: discussion at nsrca.org
Subject: Re: Trimming Question


Decrease wing incidence, which will eliminate your need for "holding"
slight down elevator.  You may ultimately have to trim it to REQUIRE
just a small amount of down elevator, particularly if the CG is where
you want it.
    Power off dive pitch moment is usually mainly influenced by wing
incidence.

Bob Pastorello, Oklahoma
NSRCA 199, AMA 46373
rcaerobob at cox.net
www.rcaerobats.net
 
 

----- Original Message ----- 
From: Peter Pennisi <mailto:pentagon.systems at bigpond.com>  
To: discussion at nsrca.org 
Sent: Sunday, August 17, 2003 5:33 PM
Subject: Trimming Question

I would like some suggestions to overcome a trimming problem I have with
my current F3A model.
 
Problem:
 
The model pulls to canopy on vertical dives as well as vertical climbs
 
Currently I have an electronic mix to overcome this problem but this is
starting to get in the way on some manoeuvres.
 
Setup:
 
Model trimmed for hands off level flight.
 

*	CG is about correct. Any more further back model becomes nervous
in wind and harder to snap - difficult to control exit. 

*	Model fly's with "NO" elevator trim. 

*	Model feel's about right inverted. A small amount of down
elevator required to maintain level. 

*	1-2 degrees of down thrust.

Can this be overcome by changing wing incidence or will screw up
something else.
 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.f3a.us/pipermail/nsrca-discussion/attachments/20030818/6320d874/attachment.html