REFLECTOR: Elevator Cuffs

Brooke Wolf bwolf1 at tds.net
Thu Nov 15 17:28:02 CST 2007


Hey Chuck

It wasn't that bad!

Brooke
 (just getting started XL-5 RG, tall)


----- Original Message ----- 
From: "Chuck Jensen" <cjensen at dts9000.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Thursday, November 15, 2007 9:12 AM
Subject: Re: REFLECTOR: Elevator Cuffs


> Scott/Joe,
>
> As mentioned, a full set of VGs on the canard and none on the wings is a 
> no-no since the canard needs to stall before the main wings and the added 
> lift from the VGs on the canard may frustrate that design.
>
> After painting, I left the VGs off both the mains and canard (XLRG). 
> Flight characteristics were unremarkable until I flew with a modest sized 
> person in the front with me.  On slow final, there was a pronounced, and 
> disconcerting, pitch oscillation that was not present with a single front 
> person.
>
> Per the suggestion of S. Baker and K. Mishler, and I believe Ronnie Brown 
> piped in, I installed a half set of VGs on the canard which consisted of 3 
> pairs on each side.  This did the trick.  It put an end to the oscillation 
> on final with better "plop" control so the nose could be set down instead 
> of always plopping down.
>
> In sum, a half set of VGs on the nose gives a little better lift and seems 
> to work well but a full set of VGs on the canard with none on the wings, 
> as Scott mentioned, is apparently not a great idea.
>
> Chuck Jensen
>
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On
> Behalf Of Scott Derrick
> Sent: Thursday, November 15, 2007 8:57 AM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: Elevator Cuffs
>
>
> Joe,
>
> I went from Cuff's No VG's, to No Cuff's No VG's, to No Cuff's and VG's.
>
> The first had gentle stall but reduced lift, second had the classic
> pitch buck stall(porpoising) and better lift, the last had the same
> stall characteristics and even better lift.  The last is my preferred
> configuration.
>
> You are putting VG's on the main wing too, right?  VG's just on the
> canard would be a big no-no.
>
> Scott
>
> Joe Ewen wrote:
>> Before I start grinding on my elevators (the ones I thought were
>> finished due to the nice shinny paint,)  I would like to check on the
>> preferred elevator configuration.  As I understand it, the best
>> configuration is no elevator cuffs and installation of VGs.
>>
>> Thanks,
>> Joe
>>
>>
>> ------------------------------------------------------------------------
>>
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> -- 
>
> -
>     Those willing to give up a little liberty for a little security
> deserve neither security nor liberty.
>
>     Benjamin Franklin
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