All,
My Ventus B has dimple tape on the underside of each wing very far
aft, and just ahead of the leading edge of the flaps/ailerons. My
question is, does this sound like the right location? Isn't this way
too far aft? All other gliders with turbulator tape I've seen have it
installed about 2/3-3/4 aft of the leading edge; not immediately in
front of the control surfaces. Also, does anyone know if there is a
preference for the Ventus B as far as whether dimple tape or zig-zag
tape is better? Or is no tape the best solution? How about
turbulator tape on the stabilizer and rudder for the Ventus B?
I apologize in advance if this has already been beat to death for this
glider.

"Ventus B" > wrote in message
m...
> All,
> My Ventus B has dimple tape on the underside of each wing very far
> aft, and just ahead of the leading edge of the flaps/ailerons. My
> question is, does this sound like the right location? Isn't this way
> too far aft? All other gliders with turbulator tape I've seen have it
> installed about 2/3-3/4 aft of the leading edge; not immediately in
> front of the control surfaces. Also, does anyone know if there is a
> preference for the Ventus B as far as whether dimple tape or zig-zag
> tape is better? Or is no tape the best solution? How about
> turbulator tape on the stabilizer and rudder for the Ventus B?
> I apologize in advance if this has already been beat to death for this
> glider.

You might want to take a look at:
http://www.ssa.org/Johnson/38-1981-12.pdf

This is Johnson's evaluation of the Ventus A, but it is the same wing as the
B, and it is the report in which he discusses turbulators for the wing.
There is an evaluation of the Ventus B on the SSA site as well, but it only
references this FTE.

Tim Ward

Got the factory specs on the B, as follows:

+Inboard end of wing---164 mm forward of T/E

+ At end of spoiler--- 152 mm forward of T/E

+ At inbd end of aileron---125 mm forward

+ Stop at a point 250 mm out on the aileron.

Zig - Zag is better than dimpled tape. I would send you this picture, but I
don't know how to do that.
JJ Sinclair

wy is zig zag better?


"JJ Sinclair" > schreef in bericht
...
> Got the factory specs on the B, as follows:
>
> +Inboard end of wing---164 mm forward of T/E
>
> + At end of spoiler--- 152 mm forward of T/E
>
> + At inbd end of aileron---125 mm forward
>
> + Stop at a point 250 mm out on the aileron.
>
> Zig - Zag is better than dimpled tape. I would send you this picture, but
I
> don't know how to do that.
> JJ Sinclair


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higher profile, trips the boundary layer better I guess. That dimple tape is
pretty low profile.
Come to think of it our Ventus B has dimple tape. Guess I'll hav to gt some
zigzag!

Ian

All, I appreciate the feedback. Can anyone else corroborate Dick
Johnson's finding (at least on the Ventus A) that turbulator strips
degraded performance at all airspeeds? I may simply remove mine and
not replace them.


"edwin" > wrote in message >...
> wy is zig zag better?
>
>
> "JJ Sinclair" > schreef in bericht
> ...
> > Got the factory specs on the B, as follows:
> >
> > +Inboard end of wing---164 mm forward of T/E
> >
> > + At end of spoiler--- 152 mm forward of T/E
> >
> > + At inbd end of aileron---125 mm forward
> >
> > + Stop at a point 250 mm out on the aileron.
> >
> > Zig - Zag is better than dimpled tape. I would send you this picture, but
> I
> > don't know how to do that.
> > JJ Sinclair
>
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.591 / Virus Database: 374 - Release Date: 17-2-2004