REFLECTOR: Vortilions and/or VG's?

[Jim Sower]

There has been a lot of back-and-forth around the VGs (I found them 
quite effective). I haven't, however, heard anything about them 
functionally replacing or reducing the need for vortilons.
Maybe I missed that part, but it's never been implied on other canards 
... Jim S.

Chuck Jensen wrote:

> Jim, I buy your story about the vertilions and VGs performing 
> different functions. Though I believe/think that I recall a posting by 
> SBaker, or someone of that ilk, that indicated if the VGs were used, 
> the vertilions were less essential. Doubtlessly, the vertilions and 
> lower winglets have coincident function.
> Chuck
> -----Original Message-----
> *From:* reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] 
> *On Behalf Of *Chuck Jensen
> *Sent:* Tuesday, July 19, 2005 5:13 PM
> *To:* Velocity Aircraft Owners and Builders list
> *Subject:* RE: REFLECTOR: Vortilions and/or VG's?
>
> The CW seems to be that VGs are expected to reduce stall by 5-7kts, 
> which for the XLRG with IO-540 engine is appreciated due to the extra 
> weight equating to extra speed at stall. And, if VGs are installed, 
> that the utility of the vertilions is reduced or eliminated. Also, if 
> your winglets extend below the bottom of the wing, that too will 
> allegedly reduces spanwise air flow. This information and 50 cents 
> will get you a half a cup of coffee.
> Chuck
> -----Original Message-----
> *From:* reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] 
> *On Behalf Of *Al Gietzen
> *Sent:* Tuesday, July 19, 2005 4:45 PM
> *To:* 'Velocity Aircraft Owners and Builders list'
> *Subject:* RE: REFLECTOR: Vortilions and/or VG's?
>
> i can't speak for the 173 but on my XL-RG which I believe is the same
>
> wing (if you are a LW) I do not have either VG's or Vortilons. i Have
>
> never flown the airplane with them and have not gotten around to
>
> installing them to find out if there is a difference. Airplane flies
>
> great as is.
>
> Since the vortilons are there to create a vortex over the wing at high 
> AOA (aid in keeping the flow attached and breaking up spanwise flow), 
> logic would suggest that VGs on the wing are a more effective means of 
> doing the same thing.
>
> Gee, Ron, I guess it’s up to you to fly without and with and let us 
> know the differenceJ.
>
> Awaiting pics of that new paint job . .
>
> Al
>
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