Vortex generators, if located in the correct position will not decrease
the cruise speed. for most airfols the vortex generators are placed far
enough back on the chord that the boundary layer is already turbulent and
it will energize the boundary layer by mixing high energy air from
outside the boundary layer into the boundary layer, when this happens the
length of attached flow is extended further aft on the airfoil and the
drag is reducedbecause of reduced seperation drag, even in cruise. On a
laminar flow airfoil like the new KR airfoil you would want to place the
vortex generators near the transition point to avoid increased drag from
the vortex generators.
My six bits worth
Jim
On Sun, 18 Dec 2005 13:07:50 -0500 Jerry Mahurin <krje...@gmail.com>
writes:
> Vortex generators are just that.......they generate vortex
> turblance.....on
> any aerodynamic surface... True they will lower stall speed when
> used on
> wings but at a sacrafice of TOP speed. Of course you can increase
> your
> CRUISE speed by pushing it up a little closer to your reduced TOP
> speed.
> But your CRUISE RPM will have to go up some to maintain the same
> cruise
> SPEED.... There ain't no such thing as a free lunch and the laws
> of
> aerodynamics are consistent.....
>
> Personally.......If I wanted to go slower, I would build a slower
> airplane
> instead of glueing little pieces of plastic all over a good looking
> one......
>
> my two cents worth for what it is worth..02 cents......
>
> Keep on keeping on....
>
> On 12/18/05, phil brookman <p...@ntlworld.com> wrote:
> >
> > very interesting has anyone done it ,cos it sure does look very
> beneficial
> > in fact i cannot see a down side , on this side of the pond a
> kolb
> > ultrastar
> > seems to be doing quite well , and theyseemm to be well proven
> > phil
> > ----- Original Message -----
> > From: "Colin Rainey" <brokerpilot9...@earthlink.net>
> > To: <kr...@mylist.net>
> > Sent: Sunday, December 18, 2005 2:27 AM
> > Subject: KR> Vortex gen
> >
> >
> > > No but I bet these guys wanting to fly slow could really benefit
> from
> > the
> > speed reduction of their stall speed with them.
> > >
> > > I have considered testing them out on our KR, as they gauruntee
> them to
> > work with no reduction in cruise speeds. I believe the Cirrus
> SR20 and
> > SR22
> > are also using them, as well as the Eagle 150. I point these out
> because
> > they are fast composite planes like the KR.
> > >
> > >
> > > Colin Rainey
> > > brokerpilot9...@earthlink.net
> > > EarthLink Revolves Around You.
> > > _______________________________________
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> > _______________________________________
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>
>
> --
> Jerry Mahurin - aka - KRJerry
> EAA# 0034283
> Lugoff, SC 29078
> _______________________________________
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