REFLECTOR: 65VT/ angle-of-attack system

[Ronnie Brown]

>From some of the old write-ups on Velocities, Danny Maher supposedly hired a
NASA engineer to develop an airfoil that would not have the problems that
the Long EZ's had when flying in the rain.  (Works!)

I would think that a 1 or 2 foot wide canard section would work fine for
your testing.  You going to set up a section and drive it down the highway?
Should be interesting. Let us know what you find!

I wish I had pursued installing the ports on top and bottom of my canard.  I
abandoned this enhancement as each "enhancement" was adding to my
construction time.  I was averaging about 2 weeks for each enhancement so I
quit.

Ronnie

----- Original Message ----- 
From: "Brian Michalk" <michalk at awpi.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Wednesday, October 06, 2004 8:46 PM
Subject: RE: REFLECTOR: 65VT/ angle-of-attack system


| Today was "Wednesday Airplane Guy Lunch Day."
|
| We were talking about AOA and the canard.  In your message,
| http://www.tvbf.org/mailman/private/reflector/2004-October/007031.html
| you talked about AOA, and there's something I wanted to get clear.
|
| >From my understanding an airfoil will stall at a specific angle of
attack.
| Is this true?
|
| If yes, then it would seem to follow that the canard/elevator combination
| will also stall at a specific AOA depending on the amount of elevator
| deflection (chord).
| For instance, elevator deflected 10 degrees, stall AOA is X1.  Elevator
| deflected 20 degrees, stall AOA is X2, and so forth for any deflection
angle
| you will have a specific Xn.
|
| Next question; this was an argument we had.  I felt that stall AOA is
| independent of air density.  Is this correct?  Will an airfoil in water
| exhibit the same stall AOA as an airfoil in air?
|
| One last question.  Not all of our canards are the same.  The ones built
by
| Alan shaw apparently have more camber.  Are we using a standard NACA
| airfoil?  Which one?  Is there any data available?  I know you probably
| don't have this information.  Maybe Scott Baker would know?
|
| Also, assuming one wanted to do some testing on a full sized airfoil, but
| one that is shorter than the standard canard, how long should it be?  I
was
| thinking a two foot section of canard would be plenty if pressure sensors
| were fixed in the middle of the airfoil.  The test would determine the
| pressure distribution at different angles and different elevator
| deflections.
|
|  Brian Michalk  <http://www.michalk.com>
| Life is what you make of it ... never wish you had done something.
| Aviator, experimental aircraft builder, motorcyclist, SCUBA diver
| musician, home-brewer, entrepreneur and barely single
|
|
| > -----Original Message-----
| > From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On
| > Behalf Of Jim Sower
| > Sent: Tuesday, October 05, 2004 11:07 PM
| > To: Velocity Aircraft Owners and Builders list
| > Subject: Re: REFLECTOR: 65VT/ angle-of-attack system
| >
| >
| > <... Are you saying you normally land at 70? How much weight is in the
| > front seats? What wing/airframe configuration? ...>
| > Standard 173 converted to gull wing doors from top loader.  280 - 460#
| > in front seat (depending if wife is along).  70 kts if the air is
| > smooth.  75 if it's choppy and still 80 if it's really rough or >10 kts
| > x-wind.  Actually, on choppy days, if things smooth out and I'm
| > comfortable crossing the fence, I cut early so as to do most of my
| > "floating" in the overrun.  I HATE to land long.  I virtually never
| > touch down as far down the runway as the "IFR stripes".  Nearly always
| > within 5-10 yds of the numbers, VERY rarely short of the numbers.
| >
| > Probably a good practice; probably a bad habit .... Jim S.
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|
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