REFLECTOR: Canard stall speed
Al Gietzen
ALVentures at cox.net
Thu Jan 31 09:34:46 CST 2008
Subject: Re: REFLECTOR: Velocity video
A canard stall speed <55 knots for an SE is much lower than I would expect.
I thought that the standard wing/fuselage was expected to mush around 70 and
the large wing/standard fuselage ("173") @ 60 knots. AM I confusing knots
with MPH? Larry Epstein
173 FGE
Larry; my SE RG begins to stall (mush) at about 70 kts with the gear down.
And that's with pulling back on the stick until there is significant down
deflection of the elevators. That's with the plane at about 1950 lbs and
the C.G. in the 'first flight' box (119 - 120 inches).
The stall characteristics seem to differ from plane to plane, but certainly
a lighter plane with CG further aft will give a lower speed stall. I don't
know how much the stall varies with CG and load. Maybe that's something
I'll check sometime, but better yet, if someone else (Scott B?) has info on
this perhaps they'd like to share.
Al
_____
Date: Wed, 30 Jan 2008 22:36:36 -0600
From: aminetech at bluefrog.com
To: reflector at tvbf.org
Subject: Re: REFLECTOR: Velocity video
OK. I should begin with the pattern as I feel everything adds up when it
comes to a good landing. First of all, keep the pitch trimmed for hands off
throughout the final leg. Speed brakes aren't needed. If you're high on
final, just pull back on the stick and slow down to stall speed. The
initial nose up attitude will make it seem like you're going to fly to the
next county, but in several seconds you will be pleasantly surprised to be
on the glide slope. My power off stall is a mush, so I barely notice
anything when stalling on final. However an observer on the ground told me
it looked like I was falling out of the sky. My stall speed is 60 kn and I
have found no problems being at 60 kn on short final/round out. After round
out I let it sink down, holding it a ft or less off the ground. At 55 kn,
the mains slowly sink and gently touch down with no pilot input while the
canard keeps flying (guess that is a deep stall, but not a problem when
you're close to the ground). Then I nudge the stick forward to get the nose
coming down and it is real easy to lower it gently to the ground.
As far as the canard stalling and the nose slamming the ground, I have had
many hard nose landings at higher speeds. I think the main cause is not
having the pitch trimmed for hands off at all times during the landing
procedure. The trim spring greatly limits how much you can move the
elevator and makes it difficult to let the canard down easy, making it seem
like the canard stalled when in fact you just couldn't pull back as fast or
much as necessary. I will caution when in LEVEL flight, not to trim the
pitch for hands off at a speed of less than 80 kn as that could result in a
deep stall. However when in the flare, trimming at slower speeds is OK,
since you want the mains to stall first.
Keep in mind that I fly an SERG. The XLs may behave differently. John
cgputney at peoplepc.com wrote:
John Dibble, please detail your landing flare procedure for us! Thanks.
----- Original Message -----
From: John Dibble <mailto:aminetech at bluefrog.com>
To: Velocity Aircraft <mailto:reflector at tvbf.org> Owners and Builders list
Sent: Sunday, January 27, 2008 9:31 AM
Subject: Re: REFLECTOR: Velocity video
Steve, It took me almost 400 hours of flying to learn that not only can I
land my SERG in a flare, but that it is 5 times easier and 10 times softer
landing.
John
steve korney wrote:
Guess that dispelled the myth that you can't land a Velocity in a
flair............ Best... Steve
_____
From: johnt at comp-sol.com
To: reflector at tvbf.org
Date: Sat, 26 Jan 2008 10:35:07 -0600
Subject: Re: REFLECTOR: Velocity video
This is one of those 'big smile' videos!
Thanks for sharing.
John
_____
From: reflector-bounces at tvbf.org [reflector-bounces at tvbf.org] On Behalf Of
Al Gietzen [ALVentures at cox.net]
Sent: Friday, January 25, 2008 10:54 PM
To: reflector
Subject: REFLECTOR: Velocity video
For those who like; I'll share some video made by my son (with my 5 yr old
grandson who's nuts about airplanes). It includes a takeoff, flyby, touch
and go, and landing; lasts about 8 minutes, and is 20MB non-streaming, so
high speed access will certainly be a plus.
http://photofu.com/darryl/Velocity_Vignette.wmv
Enjoy;
Al
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