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Date: Mon, 14 May 2007 16:03:17 -0400
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Subject: Re: [LML] Re: Flight Characteristic Question
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From: "John Schroeder" <jschroeder@perigee.net>
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Mike -

I'm not sure if this is a correct analogy, but a negative incidence of the HS would make it act like a moveable HS like most fighters or a Cardinal. i.e, in your ES, you always would have a slight "tail input" that raises the nose. The elevator movement on final approach/roundout would compliment this. Increasing the negative incidence would therefore remove the necessity to have elevator input - ie. deflected down. Also, increasing the incidence slightly would compensate for the CG being too close to the forward limit - or as you say, the "advertised forward CG limit" is not right.

John


On Mon, 14 May 2007 09:30:03 -0400, <MikeEasley@aol.com> wrote:

> From a performance standpoint, the ideal incidence of the horizontal
> stabilizer would result in the elevator being in the neutral position in cruise  at a
> typical CG, right?
>My ES cruises with the elevator deflected downward enough to expose the
> elevator counterweight arm about 1/4" above the horiz stab.   That's  at a fairly
> forward CG. As the CG moves aft the deflection increases  slightly.  Doesn't
> that suggest that the optimum incidence on my horiz stab  would be positive,
> not negative .6 like the TSIO ESs are doing?  My horiz  stab is mounted at zero.
>I'm probably at the bottom of the list when it comes to aeronautical
> engineering, but it seems to make sense that the issue isn't the incidence of  the
> horiz stab but the advertised forward CG limit, or the effectiveness of the
> elevator (size, shape, deflection, etc.).
>Mike Easley
> Colorado Springs
>
>
>
> ************************************** See what's free at http://www.aol.com.
>