How come the wings bank when I use the rudder

On a 3 hour cross country today I was amusing myself by flying with
rudder pedals only (all right, OK, a little yoke usage to maintain
altitude). But then I got to wondering why applying rudder pressure
causes the plane to bank. All I could think of was that rudder usage
produces asymmetric lift because one wing is somewhat blanked by the
sideways motion induced by the rudder? Also, the rudder surface is
above the plane's center of lift but I don't know how much of a factor
that is.

"Paul kgyy" wrote in message
oups.com...
On a 3 hour cross country today I was amusing myself by flying with
rudder pedals only (all right, OK, a little yoke usage to maintain
altitude). But then I got to wondering why applying rudder pressure
causes the plane to bank. All I could think of was that rudder usage
produces asymmetric lift because one wing is somewhat blanked by the
sideways motion induced by the rudder? Also, the rudder surface is
above the plane's center of lift but I don't know how much of a factor
that is.


As you yaw, the "outside" wing is flying faster than the "inside" wing and
generates more lift which gives you bank.

--
Geoff
The Sea Hawk at Wow Way d0t Com
remove spaces and make the obvious substitutions to reply by mail
When immigration is outlawed, only outlaws will immigrate.

Paul kgyy wrote:
On a 3 hour cross country today I was amusing myself by flying with
rudder pedals only (all right, OK, a little yoke usage to maintain
altitude). But then I got to wondering why applying rudder pressure
causes the plane to bank. All I could think of was that rudder usage
produces asymmetric lift because one wing is somewhat blanked by the
sideways motion induced by the rudder? Also, the rudder surface is
above the plane's center of lift but I don't know how much of a factor
that is.

It's called a yaw/roll couple. As you create yaw you acellerate the
outside wing which then has more lift. It raises coupling with roll and
you have turn.


--
Dudley Henriques

On Oct 20, 8:42 pm, Paul kgyy wrote:
On a 3 hour cross country today I was amusing myself by flying with
rudder pedals only (all right, OK, a little yoke usage to maintain
altitude). But then I got to wondering why applying rudder pressure
causes the plane to bank. All I could think of was that rudder usage
produces asymmetric lift because one wing is somewhat blanked by the
sideways motion induced by the rudder? Also, the rudder surface is
above the plane's center of lift but I don't know how much of a factor
that is.

In addition to what others have said, another interesting question to
ponder is why the airplane yaws when you bank.

"Andrew Sarangan" wrote in message
oups.com...
...
In addition to what others have said, another interesting question to
ponder is why the airplane yaws when you bank.



'cause if it didn't, your feet would have nothing to do ;-)

--
Geoff
The Sea Hawk at Wow Way d0t Com
remove spaces and make the obvious substitutions to reply by mail
When immigration is outlawed, only outlaws will immigrate.

In addition to what others have said, another interesting question to
ponder is why the airplane yaws when you bank.

The yaw is induced by the ailerons, so the only time you need to apply
rudder is when you are changing your bank angle with the ailerons. On
the side where the aileron is down, the wing has more lift, and more
drag. On the other side, the lift is spoiled and there is less drag.
The draggy wing yaws backwards, requiring opposite rudder.

This is why when you initiate a bank, you need to apply rudder in the
direction of the bank while the ailerons are in use, but not once you
stabilize the bank and neutralize the ailerons. When you roll back
wings level, you need to apply rudder the other direction to once
again compensate for the ailerons.

Dean

Paul kgyy wrote:
On a 3 hour cross country today I was amusing myself by flying with
rudder pedals only (all right, OK, a little yoke usage to maintain
altitude). But then I got to wondering why applying rudder pressure
causes the plane to bank.

The rudder causes the airplane to yaw; one wing goes faster, generating
more lift; the other wing goes slower, generating less lift.

vince norris

("Capt. Geoffrey Thorpe" wrote)
'cause if it didn't, your feet would have nothing to do ;-)


http://www.ercoupe.org/images/37.jpg
That would be awful...! :-)


Montblack

What gives, guys? Good question followed by three answers that
actually agree? What's up with that? Where's the usenet controversy?


Bob
The rudder causes the airplane to yaw; one wing goes faster,
generating more lift; the other wing goes slower, generating less
lift.

vince norris

--
I'm trying a new usenet client for Mac, Nemo OS X.
You can download it at http://www.malcom-mac.com/nemo

Isn't interesting that entry level RC Aircraft only have rudder and elevator
controls.. and then turn just fine.
Funny that a full sized airplane would react the same way.

In a stall, you pick up the low wing with rudder, not aileron, that only
adds adverse yaw, more drag on the low wing, and fights the rudder.
BT

"Paul kgyy" wrote in message
oups.com...
On a 3 hour cross country today I was amusing myself by flying with
rudder pedals only (all right, OK, a little yoke usage to maintain
altitude). But then I got to wondering why applying rudder pressure
causes the plane to bank. All I could think of was that rudder usage
produces asymmetric lift because one wing is somewhat blanked by the
sideways motion induced by the rudder? Also, the rudder surface is
above the plane's center of lift but I don't know how much of a factor
that is.