Hi Alex,
I am assuming you are a fixed wing pilot, however there are a variety of experience levels and backgrounds on a forum like this, so I know it isn't safe to assume. If you have access to a plane and are going flying soon, here is an exercise I would suggest. Roll into a coordinated 30 deg AOB turn and be very conscious of where the controls were in S&L flight prior to entering the turn. Pay attention to what you need to do with the controls to roll into the AOB desired and keep the nose up and the ball centered. All 3 axis will be used. Once stabilized in the turn at your desired AOB, note the position of the controls. The answer isn't precisely the same in all airplanes depending on their design. Let us know where the stick is tilted. There are 3 possible options:
A. Tilted in the direction of the turn
B. Neutral
C. Tilted away from the turn
You may be surprised at what you discover. If you don't have access to a plane, want to take a guess at the answer? Actually, you already have by your statement below that surely I must know its tilted in the direction of the turn. Actually, I don't. Convince me.
Jim Bair
From: A. Censor
Sent: Saturday, March 17, 2012 12:04 AM
Subject: Light-Sport Aircraft Yahoo group Re: Why does it TURN (not just slide sidewards) when you bank w/ no
Hi Jim,
Are you trying to make some point indirectly by your question to me without spelling it out?
(If so, it's completely blown by me) 
Surely you already know without asking me that the aileron control (the stick) is tilted in the direction of the turn?
Re: Why does it TURN (not just slide sidewards) when you bank w/ no
Posted by: "Jim Bair" jimbair@live.com jim_bair
Thu Mar 15, 2012 9:17 am (PDT)
Alex,
Where is your aileron control while stabilized in a turn?
Jim Bair
From: circicirci
Sent: Thursday, March 15, 2012 10:53 AM
To: Sport_Aircraft@yahoogroups.com
Subject: Light-Sport Aircraft Yahoo group Why does it TURN (not just slide sidewards) when you bank w/ no rudder?
Hey Bill,
Thanks for that question. I'd been thinking about that.
To recap your question (which is below):
In level flight without any rudder you bank. The plane turns to the side of the bank. The horizontal component of lift should slide the plane sidewards towards the side you have banked but continue to fly straight ahead but banked. It does not explain what makes the plane turn on a circular course.
So what's making the plane TURN?
Gary, I don't see how dihedral explains the plane _turning_ toward the side of the bank. All postive dihedral does is create a tendency for the plane to return to level flight if you let go of the controls.
Negative creates a tendency for the plane to continue to roll further once you start a bank.
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.
Alex
Where is your aileron control while stabilized in a turn?
Jim Bair
From: circicirci
Sent: Thursday, March 15, 2012 10:53 AM
To: Sport_Aircraft@
Subject: Light-Sport Aircraft Yahoo group Why does it TURN (not just slide sidewards) when you bank w/ no rudder?
Hey Bill,
Thanks for that question. I'd been thinking about that.
To recap your question (which is below):
In level flight without any rudder you bank. The plane turns to the side of the bank. The horizontal component of lift should slide the plane sidewards towards the side you have banked but continue to fly straight ahead but banked. It does not explain what makes the plane turn on a circular course.
So what's making the plane TURN?
Gary, I don't see how dihedral explains the plane _turning_ toward the side of the bank. All postive dihedral does is create a tendency for the plane to return to level flight if you let go of the controls.
Negative creates a tendency for the plane to continue to roll further once you start a bank.
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.
Alex
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