Speed brakes such as those fitted on a Caravelle was full of holes,
this provided for more turbulence and hence resistance per square inch
of surface in the wind.
Alex, kit 529
Enviado de meu iPhone
Em 29/08/2010, =C3-s 00:50, Karl Heindl <kheindl@msn.com> escreveu:
>
> Hi motorglider guys.
>
> Has anyone made any changes to their airbrakes ? I find they
> requires a lot of force to hold them in the fully open position. The
> air pressure on the bottom half far exceeds that on the top.
> Because of that it is also impossible to get the maximum deflection
> of 60 degrees. I mounted an angle indicator, and it shows about
> 45-50, which severely degrades their performance.
> I don't understand why nothing was ever done about this. They have
> been producing these wings for about 11 years now.
> The obvious solution to me is to reduce the area of the bottom half,
> either by putting in holes, or trimming back the trailing edge.
> These brakes are not really necessary with the engine running, but
> are essential when I get to making dead stick landings.
>
> Karl
>
>
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