Roll trim is a definate plus as the trim changes with passenger load. I
hear the MAC unit works well but a different method is to use a model
airplane servo and driver. (I'm always a bit different!)
I used a Hitec 605BB servo which is very, very small and easy to mount in
the aileron. Starting with a finished aileron, cut the tab out then cut a
hole in the bottom of the aileron. I layed up some extra glass in the hole
and just epoxied the servo in place. Model airplane linkage, hinges and
control horns were used to complete the installation and the cover is glued
in place with silicone sealer.
Since the model servo adds very little weight, balance is still easy. The
control is a servo drive from a company called Custom Electronics. It's
basically a knob which is panel mounted. When you turn the knob the servo
follows and stays where you put it. Its fast, cheap and works great. For
power a 5v regulator from radio shack steps the voltage down to power the
system. All the parts are availiable at your local Hobby Shop for under 100
bucks.
Bob Jacobsen
A131 N165BB
From: Svein Johnsen <svein.johnsen@mossww.com>
>Subject: Roll Trim Tab
>Date: Mon, 25 Jun 2001 12:43:45 -0500
>
>It has been recommended to me by an experienced Europa pilot to install a
>roll trim tab (electric servo) in the port side aileron. I understand from
>MAC (now Ray Allen Company) that several Europa builders have done this.
>Although I have not started building yet, the time to do this mod would of
>course be at the early stage, so I would appreciate to learn from those who
>have done it, both with respect to technical info and operational
>experience, as well as from those who have considered it but decided not to
>(reason for why not). If anyone has a word of caution, that will also be
>very much appreciated.
>
>Svein Johnsen - A225
>
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