REFLECTOR: Update on 444DX

[Mark Magee]

I agree with John. I don't claim to know the operating envelope on a VG-altered-for-slow-flight Velo but that mushing down profile concerns me. The familiar 'Dolphin Down' break of the canard is the inherent safety trademark of the canard-pusher configuration. CG as was mentioned as was mentioned is as well very important. Too nose heavy: you stay on the ground (bird struggles to lift nose on rotation. Too tail heavy: on slow flight and high AOA bird mushes into a deep stall....
I'm sure you know this, but we are talking about altering the basic reason reason why we fly canards: efficiency and stall resistance. Your stall profile seems to be altered markedly.
Fly it hot, land it hot baby! 
No VG's for this reprobate.
If you want slow fly get a Kitfox?

Mark B. Magee
Sent from IPhone 4

On Jun 7, 2012, at 7:19 AM, John Dibble <aminetech at bluefrog.com> wrote:

> On 6/6/2012 11:06 PM, David Ullman wrote:
>> I now have about 27 hours on 444DX.  Getting things sorted out.  I have been
>> to 10,500 ft and over 200kts (in a dive).  I have done both low and power-on
>> mushes.  I cant call them stalls as it doesn't.  Around 50 kts it just
>> mushes.  I still have roll and yaw control all the way down.  Overall the
>> plane is very easy to handle at any speed.  I hate the thought that this may
>> be due to the vortex generators.  I just cant intellectually get past the
>> fact that I have put vortex generators on a laminar flow surface.  Anyway, a
>> very easy pane to fly.
>> 
>> 
> David,
> 
> IMO, a stall mush is indicative that you are at the borderline where a deep stall occurs.
> 50 kn is unusually low for a stall speed.  If you're flying with the least weight you'll ever have
> in the front seats, then you'll probably be ok.  However you might consider removing at least some
> of the vgs from the canard to get a bit higher stall speed for more safety margin.
> 
> John
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