REFLECTOR: Velocity video

[John Dibble]

Dave Philipsen wrote:

>
> Wow, my canard stalls at around 65 knots when I'm up in the air.  Maybe
> that number comes down a bit when in ground effect.  Is that what you're
> implying?

Yes, plus the elevator "flap" effect.

>  Sounds like you are saying that you could fly final with the
> canard bobbing and by the time you get down close to the ground it would
> stop bobbing because of ground effect.

Yes.  However my power off stall is a mush.  I would be less comfortable rounding out
if the nose were bobbing significantly.  With 2 up front I get a very gentle, barely
perceptable oscillation which does go away in ground effect.

>
>
> Do you have the throttle cut to idle before you touch down?

Yes.


>
>
> I thought the danger of deep stall was pretty much eliminated some years
> ago with some changes made to the shape of the main wings.  Is it really
> still possible to deep stall in slow flight?  If so, is it recoverable?

I did a stall test according to the procedure posted by Scott B several years ago
which calls for setting up at 80 kn and pulling back on the stick to get the stall.  I
got a mush and concluded that was satisfactory, but probably at my aft cg limit.
I want to emphasize that I believe elevator position is very important.  I believe
that for the stall test, had I not pulled back on the stick and instead used my trim
button, I would have achieved a lower speed where the main wing would have stalled and
the canard kept flying (deep stall).  This is just theory as I'm not willing to try
it.  This is my reason for recommending never to trim for level flight at a speed less
than 80 kn.

John

>
> Dave Philipsen
> Velocity STD-FG
> N83DP
>
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