REFLECTOR: VG

[Al Gietzen]

The vortilons play a role similar to the VGs, just a different method and
different scale.  Their job is to generate a vortex OVER the wing at high
AOA to reduce flow separation and the span-wise flow that can develop under
the separated flow.  On a swept wing there is a span-wise flow component at
the leading edge at low speed which the vortilons use to set up a vortex
over the wing.  Vortilons have essentially zero drag at cruise.  The VGs do
a more effective job; particularly in improving aileron authority at low
speeds; but do result in some drag.

 

That's my story, and I'm sticking to it:-).

 

Al 

 

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Scott Derrick
Sent: Friday, January 06, 2012 10:46 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: VG

 

I'm not sure why Duane said that. 

During the main wing stall investigation when Maher still owned Velocity, he
said that Vortilons significantly reduced the chance of encountering deep
stall and recommended them on all airplanes in addition to the changes they
made to the strake and reduced rear CG range.

Maybe The Swings changed something later that reduced that requirement?
Maybe only STD size wings need them? 

I had not heard they were no longer required and apologize if I was
spreading miss-information.  They are supposed make the ailerons more
effective at low speeds, I don't know because I have never flown without
them. 

I have flown with and without VG's and they definitely increase aileron
effectiveness and reduce takeoff and landing speeds.

Scott 




-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.tvbf.org/mailman/private/reflector/attachments/20120106/a93512d2/attachment.htm>