I was gonna cite CG too, but I see that more of a morning person than
I has so responded.
Are your tab settings are within the book? That might be a cause too,
as a guess, maybe aggraved by the over-length Flettners adding more
unintended camber.
Regards,
Fred F., A063
Dave DeFord wrote:
>
> Hi Folks,
>
> N135TD tends to oscillate slowly in altitude when the stick is left free.
> This is most noticeable when the Navaid autopilot is on, since there is a
> natural tendency to keep the airplane level, without really noticing it,
> when the pilot's hand is on the stick. Typical parameters are speed
> variation +/-5 KIAS, altitude +/-50 feet, VSI +/-300 fpm, and a total cycle
> time of about 1 minute.
> ....
> > The only deviation we can see from the specifications is the width of the
> Flettner strips. By the time we got done filling and finishing over them,
> they measure about 3/4" to 7/8" wide from the trailing edge, to the point
> where they disappear into the tab surface. The manual specifies 1/2"
> maximum. Thickness at the trailing edge is 3/8", which is the maximum
> recommended. If we need to make the slope to the trailing edge more abrupt,
> we will grind them down appropriately. I would just hate to tear up the
> nice painted surface, only to find that it made no difference! Anyone with
> experience or some solid theory on this?
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