Thanks, Jim.
I had to look up "oil-canning”. I now realise that was the effect that I saw
in the skin of a Mig 29 which I saw somewhere, years ago. It was built like a
battleship.
Chris
> On 15 Jun 16, at 22:50, Jim Nichols <jhnichols@xxxxxxxxxxxxx> wrote:
>
>
> The dimpled ribbing is primarily to add stiffness and prevent oil-canning.
> Piper learned, to their dismay, in the 1960s, that raised ribs, stamped into
> the sheet metal, led to transverse fatigue cracking. When they changed to
> dimpled ribs, the problem was greatly diminished.
>
> The classic vortex generator installation has the small vanes installed in
> pairs, with the leading edges slightly inclined toward each other. These
> produce counter-rotating vortices which energize the boundary layer to reduce
> airflow separation. DeHavilland apparently felt that the flow had enough
> angularity of its own, so installed them in parallel.
--
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