REFLECTOR: vortex generators

[Chuck Jensen]

The Factory has VGs they sell as a set with template for installation or
you can buy them individually.  They are a bit more then at el cheapo,
something like a buck apiece, but they are well shaped and by scratching
up the underside, they stick on the wing and canard well with silastic.
They also paint up well.

When I did a repaint, I left them off.  I flew a while and didn't notice
much difference.  Then, I happened to be giving a ride to an EZ driver
(a fairly robust guy) and was coming in on long final when I started
notice vertical oscillation (porpoising).  It started out subtle and got
more pronounced the slower I got.  It was the same sensation as doing
pitch-buck stalls.  At 3000' agl, no problem. At 30' agl, it's a whole
different matter.

After discussing with S.Baker, K.Mishler, et al, I decided to follow the
suggestion of adding 1/2 set VGs to the canard.  Big difference.  I'm
able to hold the nose off much better with only the occasional "plop",
but a more muted one at that.  With two people in front, heavy fuel and
some other gear, the approach is rock steady without a hint of
oscillation.

As I was forewarned, its not a good idea to put a full set on the canard
and none on the wings.  The canard still needs to stall before the wing
so you don't find your self in "deep s****.  

Chuck Jensen

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of David Scharfenberg
Sent: Monday, August 06, 2007 12:11 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: vortex generators


I west to Lowe's and they didn't have any of the small angles, but they 
did have some plastic pieces that were made to go on the edges of 
paneling.  With a little work they look just like vortex generators.

Thanks for the responses.

Dave


On Aug 5, 2007, at 8:00 AM, Alex Balic wrote:

> You could use the tiny aluminum angle extrusions from Lowes/Home
> depot- and
> attach with caulking/adhesive (do not use silicone caulk if your 
> surfaces
> are unpainted, it will be almost impossible to remove completely later

> from
> the primer and prevent proper adhesion of your future top coat ) 
> probably
> some plastic angle out there, just not as readily available
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] 
> On Behalf Of David Scharfenberg
> Sent: Saturday, August 04, 2007 11:29 PM
> To: 'Velocity Aircraft Owners and Builders list'
> Subject: REFLECTOR: vortex generators
>
> Does anyone remember what people were using to make inexpensive, 
> temporary vortex generators?  It seems like they could be cut from a 
> readily available product, but I can't remember what it was.
>
> Thanks,
>
> Dave Scharfenberg
>
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