Snaps

[Del K. Rykert]

I was taught that a wing is stalled when it will no longer support the
aircraft in flight. You would be losing altitude if in level flight until
airflow is returned over the wing to support the weight of the aircraft.
Granted this is over simplification but when you ask about laminar flow
separation I understood that you can have separation when in a well trimmed
plane and still not lose much altitude but I believe this is getting into
semantics and not germane to models being judged for snapping or not
snapping.

                         del
               NSRCA - 473
----- Original Message ----- 
From: "Adam Glatt" <adam.g at sasktel.net>
To: <discussion at nsrca.org>
Sent: Wednesday, April 14, 2004 10:44 AM
Subject: Re: Snaps


> Isn't the definition of a stalled wing just that it doesn't have laminar
> flow?  That is entirely possible in a downline with sharp elevator input
> (think less extreme version of a TOC plane's parachute or wall).
>
> -----Original Message-----
>
> >       *From:* discussion-request at nsrca.org
> >       [mailto:discussion-request at nsrca.org]* On Behalf Of* Ed Alt
> >       *Sent:* Tuesday, April 13, 2004 11:37 PM
> >       *To:* discussion at nsrca.org
> >       *Subject:* Re: Snaps
> >
> >       Jim:
> >
> >       The wing is stalled when the critical angle of attack is
> >       reached, which can happen at any airspeed, starting from any
> >       flight attitude. This is most easily seen & felt if you go up in
> >       a light plane and gradually work the yoke back, increasing the
> >       angle of attack and holding altitude as airspeed bleeds off
> >       before the stall.  This can go on for many seconds.  The total
> >       lift is staying the same before the stall, but the wing doesn't
> >       stall until the angle of attack gradually increases to the point
> >       that the critical AOA is reached.  In that example, the critical
> >       AOA will be reached at a lower airspeed due than if the pilot
> >       had done an accelerated stall by yanking the yoke rapidly back.
> >
> >       Ed
> >
> >             ----- Original Message -----
> >
> >             *From:* _JOddino_ <mailto:JOddino at socal.rr.com>
> >
> >             *To:* _discussion at nsrca.org_ <mailto:discussion at nsrca.org>
> >
> >             *Sent:* Wednesday, April 14, 2004 1:15 AM
> >
> >             *Subject:* Re: Snaps
> >
> >             How do you stall a wing that is not producing any lift, as
> >             in the case when the plane is on a vertical up or down line?
> >
> >             My definnition of stall is when an increase in angle of
> >             attack does not produce an increase in lift.  Another
> >             might be when the lift does not exceed the weight.  I've
> >             got to believe we know a snap when we see it and we ought
> >             to quit trying to describe it in words.
> >
> >             Jim
> >
> >                   ----- Original Message -----
> >
> >                   *From:* _Patternrules at aol.com_
> >                   <mailto:Patternrules at aol.com>
> >
> >                   *To:* _discussion at nsrca.org_
> >                   <mailto:discussion at nsrca.org>
> >
> >                   *Sent:* Tuesday, April 13, 2004 6:13 PM
> >
> >                   *Subject:* Re: Snaps
> >
> >                   In a message dated 4/13/2004 8:06:56 PM US Eastern
> >                   Standard Time, _rcsteve at tcrcm.org_
> >                   <mailto:rcsteve at tcrcm.org> writes:
> >
> >                         * Don't stop reading as so many do, this is
> >                         the next sentence.*
> >
> >                   *  *
> >
> >                   * 1. Since the maneuver is defined as a stall maneuver
> >                   (initiated by a rapid stall of the wing induced
> >                   by a change in pitch attitude), the nose of the
> >                   fuselage should show a definite break from the
> >                   flight path in the direction of the snap (positive
> >                   or negative) while the track closely maintains
> >                   the flight path.
> >                    *
> >
> >
> >
> >
> >
> >                   */Steve Maxwell/*
> >
>
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