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Re: Aileron trim servo location

Subject: Re: Aileron trim servo location
From: Terry Seaver <terrys@cisco.com>
Date: Thu, 4 May 2000 14:13:25
carl@photos.prestel.co.uk wrote:

> Silly question, but why do you need for an aileron trim tab (unless you
> built your wings wrong !).  It should not be necessary to have an aileron
> trim tab but even if this is the case surely a fixed tab is all that is
> needed (a bent alloy plate riveted to the trailing edge).
>
> The last kitplane that I built did not need a tab and as far as I am aware,
> none of the UK built Europas that I have seen have such tabs.
>
> Surely a motorised tab is an unnecessary addition of weight - or am I
> missing something ?
>
> Carl Pattinson
> G-LABS
>
> ----- Original Message -----
> From: <aviatordave@fuse.net>
> Cc: Europa <europa@avnet.co.uk>
> Subject: Re: Aileron trim servo location
>
> > Bill,
> >     The aileron trim tab need not be far out on the aileron.  It does
> > not need leverage because it does not move the wing up or down.  The
> > aileron trim tab moves THE AILERON... The aileron then moves the wing.
> > The aileron has the longer moment (leverage), the trim tab does not.
> >     Bearing this concept in mind:  it might be best to locate the tab
> > and servo in the inboard side of the aileron.  It is thicker here and
> > the wire runs are shorter.  I'm making my tab 2" X 6".  We'll see if
> > that is a good size.  I might note that I have studied the size of the
> > trim tabs on ALOT of airplanes at Oshkosh and Sun 'N Fun.  It does not
> > need to be very big at all.
> >
> > Dave Conrad, A078, Cincinnati, OH, USA
> >
> >
>

I have a bi-plane that needs no aileron trim because
the pilot and passenger both sit on the centerline. I
found a noticable difference in aileron trim in a C152
when flying solo vs with a passenger, especially on
longer trips, when even a slight difference can be
tiring. I have been told by Kim Prout that the
Europa is similar, i.e. the difference between
flying solo and with a passenger makes aileron
trim a useful feature.

Terry Seaver



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