Re: Light-Sport Aircraft Yahoo group Re: Why does it TURN (not just slide sidewards) when you bank w/ no

circicirci,

Here is a better explanation.

When lift is produced, drag is produced
The more lift, the more drag.

The up aileron reduces lift, therefore less drag
The down aileron increases lift, therefore more drag

so a roll to the left tends to produce adverse yaw to the right (I.E. the nose
tends to turn away from the bank.)

The 'faster wing' concept only comes into play when the wing is actually in the
turn.

R. Williams

---------- Original Message -----------
From: "circicirci" <acensor@fastmail.fm>
To: Sport_Aircraft@yahoogroups.com
Sent: Mon, 19 Mar 2012 19:23:12 -0000
Subject: Light-Sport Aircraft Yahoo group Re: Why does it TURN (not just slide
sidewards) when you bank w/ no

> Hi Jim,
>
> --- In Sport_Aircraft@yahoogroups.com, you, "James Bair" <jimbair@...> wrote,
In part:
>
> > Your final paragraph about the lowered and raised ailerons is either totally
incorrect or is simply worded in a way you didn't mean, because the drag you
talk about is actually backwards.<
>
> You were referring to my earlier saying this:
> "I stand by my theory for now:
> Somehow the bank must be creating more drag on the lower wing (or less
> on the raised wing) creating the turning force.
>
> My guess is the raised aileron on the lower wing -- being in the
> different airflow of the upper wing surface -- creates MORE drag on
> the lower wing than the lowered aileron on the raised wing does. "
>
> ---
> Well I may be wrong about the raised aileron on the lowered wing
> creating more drag on that wing, but if so I'm in some pretty good and
> credible company in believing that.
>
> See the file "Yaw when banking aircraft.doc " that I just uploaded to
> our files area.
>
> Or just go to --
> http://www.decodedscience.com/side-effect-of-rolling-an-airplane-
> aircraft-yaw/7209 .
>
> In part what it says there is --
>
> "1. An aircraft initiates a roll to its left.
> 2. The left aileron (attached to the wing) goes up to produce drag.
> 3. The right aileron moves downward to produce more lift.
>
> 4. As a consequence of increased drag on the left wing, and increased
> lift on the right wing, the left wing rolls downward while the right
> wing rolls upward.
> 5. During this phase (with the left wing down and the right wing up),
> the right wing travels faster through the air and contributes more to
> the production of lift.
> 6. This increased lift acts diagonally and is divided into two
> components. The horizontal component of lift enables an airplane to
> roll in the desired direction.
> 7. The increased production of lift due to the right wing's relatively
> higher airspeed and its aileron in down position induces an aircraft
> yaw towards the left. "
>
> Sounds like basically what I said.
>
> The aeronautical credentials of the author (see the site) are good,
> and it makes sense to me. So, I'm sticking with the "more drag on the
> lowered wing is applying the yaw (turning) force" for now.
>
> Alex
------- End of Original Message -------

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