> > I've found on the fixed TD that raising the tail too early leaves
insufficient
> > rudder authority when there's a crosswind from the left.
> > This is inconsistent with the size/expected power of the large rudder.
> > I have no explanation.
> >
> > Duncan McFadyean
>
> I'll give it a try. Chapter 9 in "Fluid Dynamic Lift" explains it
> all, but the only part I can comprehend is the analysis of chord ratio
> (rudder to total chord): effectiveness vs. chord ratio vs.
> deflection. Relatively large rudders cause earlier flow separation on
> one side as deflection angle increases. Plus other factors like
> thickness, aspect ratio, and fuselage effect, Hoerner says.
>
> Best,
> Fred F.
> N3EU
also: possible blanking effect of the wing when "down" - most noticeable on
Waco UPF7's which are a ***** to 3 point, but a delight to wheel on.
M
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