Turbulators and DG-101

[John DeRosa Sky Soaring Chicago IL]

I just bought a DG-101 and was trying to figure out if turbulator tape
would help the performance.

I sent that question to the general DG factory email account
) and got a nice reply from Wilhelm Dirks (Chief
Designer!).

His response was succinct; "Turbulators won't make sense on the
profiles used." Nuf said...but I wonder why.

Thanks, John

[Bert Willing]

To express it simply:
Modern profiles create a bubble because the max thickness is put way to the
leading edge in order to increase the laminar flow length on the lower
surface, and turbulators help to destroy this bubble. Earlier profiles are
designed differently and don't tend to have this bubble, so a turbulator is
completely useless (at best).

--
Bert Willing

ASW20 "TW"


"John DeRosa Sky Soaring Chicago IL" > a écrit dans le
message de om...
> I just bought a DG-101 and was trying to figure out if turbulator tape
> would help the performance.
>
> I sent that question to the general DG factory email account
> ) and got a nice reply from Wilhelm Dirks (Chief
> Designer!).
>
> His response was succinct; "Turbulators won't make sense on the
> profiles used." Nuf said...but I wonder why.
>
> Thanks, John

[John DeRosa Sky Soaring Chicago IL]

Bret - Thanks for your answer. This is amazingly similar to the
answer I got from Wilhelm Dirks today;

"Modern wing sections are designed with a steep pressure increase at
the
lower surface at about 80% chord to achieve long laminar flow. The
steep
pressure increase will form a laminar bubble which will be eliminated
by
the turbulator. Older sections have the pressure increase beginning at
50%, so there will be no bubble which must be destroyed by
turbulators."

Thanks again, John

"Bert Willing" > wrote in message >...
> To express it simply:
> Modern profiles create a bubble because the max thickness is put way to the
> leading edge in order to increase the laminar flow length on the lower
> surface, and turbulators help to destroy this bubble. Earlier profiles are
> designed differently and don't tend to have this bubble, so a turbulator is
> completely useless (at best).
>
> --
> Bert Willing
>
> ASW20 "TW"
>
>
> "John DeRosa Sky Soaring Chicago IL" > a écrit dans le
> message de om...
> > I just bought a DG-101 and was trying to figure out if turbulator tape
> > would help the performance.
> >
> > I sent that question to the general DG factory email account
> > ) and got a nice reply from Wilhelm Dirks (Chief
> > Designer!).
> >
> > His response was succinct; "Turbulators won't make sense on the
> > profiles used." Nuf said...but I wonder why.
> >
> > Thanks, John