Message-ID: <20000627233258.5437.qmail@web116.yahoomail.com>
Date: Tue, 27 Jun 2000 16:32:58 -0700 (PDT)
From: BILL HANNAHAN <wfhannahan@yahoo.com>
Subject: flap trim
To: MAIL LANCAIR <lancair.list@olsusa.com>
Reply-To: lancair.list@olsusa.com
Mime-Version: 1.0

          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
          <<  Lancair Builders' Mail List  >>
          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> 
>>
Angier writes
So, I'm wondering how sensitive are these flaps 
to small rigging adjustments of
perhaps a 1/2 turn on a rod end bearing?

Test flying reveled a left wing heavy condition
which required about 3/8" flap differential.
Subsequently I discovered that  the problem could
be relieved simply by keeping a few more gallons
in the right wing, however frequent selector
valve changes were still required to keep the
plane in roll trim during cross country flights. 

I built an electric roll trim system using a
small gear motor, cable and two springs (no trim
tab)mounted under the seat. A tiny voltage
regulator adjusts the speed.
I am completely satisfied with this system, all
surfaces are normally in trim, I switch tanks
when the ailerons become noticeably out of trim,
about every 40-60 min.

The most important feature of the trim system is
that the cable is not pinned to the gear motor,
but simply wraps about the pulley. Should the
motor run-away it cannot overpower the pilot as
the cable slips above 3lbf. stick pressure.


=====
BILL HANNAHAN
WFHANNAHAN@YAHOO.COM


__________________________________________________
Do You Yahoo!?
Get Yahoo! Mail - Free email you can access from anywhere!
http://mail.yahoo.com/
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>