Thanks Frans!
*Very* interesting.
just a note - my original statement below is wrong - as an upward trim tab
results in a downward force on the tail, not lift as I had originally
(incorrectly) thought.
questions:
- were you in stead-state constant-altitude cruise?
- where was your trim set at?
- was your stick force = 0?
- what was your cruise speed?
- what was your weight and balance (with fuel at that point in time)?
As the tailplane is a symmetrical airfoil, my confused mind asserts that in
cruise (since the horizontal stab by definition must be providing a downward
force) your tailplane must have been at a negative angle of attack, and
since the combination anti-servo/trim tab was in a neutral position then I
would have expected a steady stick force would have needed to be applied....
or a far aft CG condition would have been needed?
Many thanks!
Pete
A239
On Wed, May 12, 2010 at 4:05 AM, Frans Veldman <frans@privatepilots.nl>wrote:
> On 04/12/2010 08:06 PM, Peter Zutrauen wrote:
>
> > I'm perplexed - all the photos I've ever looked at of Europas in cruise,
> > the trim tab is *up* (as others have noted), thus the flying elevator is
> > by definition providing *lift* to the tail.... a contradiction to my
> > teachings.
>
> Let's add some more to the confusion...
>
> Especially for those who claim never having seen an Europa with the anti
> servo tab NOT in the up position, here are some pictures we took when
> flying our PH-DIY in formation with the PH-JAI from Tim Weert.
>
> As you can see on the attached pictures, the PH-DIY has the anti servo
> tab perfectly in line with the rest of the tail plane (as it should be,
> because it is an anti servo tab, who's task it is to drive the tailplane
> until it is line with the trim tab).
>
> Frans
>
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