I think if I had a flaming newspaper up my ass I too would be doing alot of jumping up and down.
Unfortunately I have lead a somewhat more sheltered life.
In the Turn
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Cat Driver wrote:I was a spectator to the Zulu Warrior dance many years ago when I had the opportunity of spending a couple of weeks with A group of British SAS guys.
The dancer has no clothes on and they stick a newspaper up his as. and set fire to it, while the rest of the group jump up and down in a circle around the warrior.
I have had some real culture experiences during my flying career and that was a highlight.
Cat
hi!
So....shut the power off roll in 59.9 degrees crank back on the stick and slam her back over the other direction and firewal it again its always fun. so do that just because?
my answer was pretty valid FTGU and FTM have it in there FTGU has a good diagram. but the weather cocking answer is not incorrect either its just kind of a mix of both/ everything. its kind hard to answer.
later
don
.... just because ....good one
So....shut the power off roll in 59.9 degrees crank back on the stick and slam her back over the other direction and firewal it again its always fun. so do that just because?
my answer was pretty valid FTGU and FTM have it in there FTGU has a good diagram. but the weather cocking answer is not incorrect either its just kind of a mix of both/ everything. its kind hard to answer.
later
don
.... just because ....good one
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RatherBeFlying
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The Basic Physics
Lift is a force normal to the lateral and longitudinal axes.
When the wings are banked, the lift vector is normal to the bank (same as when its level) and generates a centripedal acceleration along its horizontal component (zero when level).
Remember that any object in a turn is being subjected to centripedal acceleration; so, to turn you have to apply a horizontal force in whatever you're driving: bike, car, skates, boat, airplane...
In airplanes, the horizontal force comes from tilting the lift vector in the desired direction of the turn.
When the wings are banked, the lift vector is normal to the bank (same as when its level) and generates a centripedal acceleration along its horizontal component (zero when level).
Remember that any object in a turn is being subjected to centripedal acceleration; so, to turn you have to apply a horizontal force in whatever you're driving: bike, car, skates, boat, airplane...
In airplanes, the horizontal force comes from tilting the lift vector in the desired direction of the turn.
I'll try to make it simple...
When you bank the aircraft, the 'lift vector,' which is *perpendicular* to the wings (ie: straight up if you're flying level) tilts with the airplane.
So, let's say you're banked right, this is the lift vector: /
That vector has an upwards component: |
and a sideways component: _
So your wings pull you a little sideways, but this is *not* what makes the airplane turn, what it does is change the direction of the relative airflow.
If you bank right, the relative airflow is now from forward and *right* of the airplane, so if you were flying a heading of say, 000, the relative airflow would be maybe 005 (or it could be 001 I don't know): a little from the right.
So now that the airflow is contacting your airplane from the right, when it hits the vertical stab, it puts a force on it that makes it want to *parallel* the airflow. Just like a weathervane or a flag does. It's *this force* of weathervaning that turns you. It pushes the vertical stabilizer, along with the whole chunk of metal it's attached to
That's about the gist of it as far as I know, I hope it made sense..
Disclaimer: you can't call the force the wings create "lift," apparantly. The whole force the wings make is called, I think, the resultant vector or resultant force. You can only call the vertical component of the resultant "lift." Just semantics though.
When you bank the aircraft, the 'lift vector,' which is *perpendicular* to the wings (ie: straight up if you're flying level) tilts with the airplane.
So, let's say you're banked right, this is the lift vector: /
That vector has an upwards component: |
and a sideways component: _
So your wings pull you a little sideways, but this is *not* what makes the airplane turn, what it does is change the direction of the relative airflow.
If you bank right, the relative airflow is now from forward and *right* of the airplane, so if you were flying a heading of say, 000, the relative airflow would be maybe 005 (or it could be 001 I don't know): a little from the right.
So now that the airflow is contacting your airplane from the right, when it hits the vertical stab, it puts a force on it that makes it want to *parallel* the airflow. Just like a weathervane or a flag does. It's *this force* of weathervaning that turns you. It pushes the vertical stabilizer, along with the whole chunk of metal it's attached to
That's about the gist of it as far as I know, I hope it made sense..
Disclaimer: you can't call the force the wings create "lift," apparantly. The whole force the wings make is called, I think, the resultant vector or resultant force. You can only call the vertical component of the resultant "lift." Just semantics though.
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RatherBeFlying
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There's a difference between turning something and pointing it where it's going. Of course in an, a/c we need to do both.
Turning a moving object changes its path -- that's what bank does for you in an a/c.
The fin and rudder keep the a/c aligned with the airflow unless you want to sideslip.
It's rotation around the lateral axis that points you where you are going in a turn.
Imagine an aerobatic a/c capable of sustained knife-edge flight in a 90 degree bank. The fuselage provides the lift; alternatively we can say that sideslip is used to maintain height. The lift vector from the wing is completely horizontal and turns the a/c. Assuming a symmetrical airfoil and a zero angle of attack, the a/c does not turn. Notice that the fin/rudder do not participate in the turn. The elevator rotates the a/c around the lateral axis and controls both the turn in space and the direction the a/c is pointed.
If we look at r/c a/c, many have no ailerons, but lots of dihedral. Rudder is used to control bank. And we all use rudder in full size a/c for fine heading adjustments on final.
Turning a moving object changes its path -- that's what bank does for you in an a/c.
The fin and rudder keep the a/c aligned with the airflow unless you want to sideslip.
It's rotation around the lateral axis that points you where you are going in a turn.
Imagine an aerobatic a/c capable of sustained knife-edge flight in a 90 degree bank. The fuselage provides the lift; alternatively we can say that sideslip is used to maintain height. The lift vector from the wing is completely horizontal and turns the a/c. Assuming a symmetrical airfoil and a zero angle of attack, the a/c does not turn. Notice that the fin/rudder do not participate in the turn. The elevator rotates the a/c around the lateral axis and controls both the turn in space and the direction the a/c is pointed.
If we look at r/c a/c, many have no ailerons, but lots of dihedral. Rudder is used to control bank. And we all use rudder in full size a/c for fine heading adjustments on final.
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co-joe
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Okay but what you're missing is the last part. Yes rolling the aircraft into a bank is caused by the ailerons, but even without rudder the aircraft will still change heading (turn).Icarus wrote:Hey,
I can't beleive no one has just explained this yet. Anyways here goes..
In a turn the ailerons tilt the wings in the direction of the turn. lift acts perpendicular to the wings thus in the turn the lift does act in the direction of the turn thus starting the turn. you add rudder to co-ordinate and the simplest way of saying it it keeps your tail from swinging out into a skidding/ or inward into a slipping turn. thus your turn is both forces from the wing and just the right amount of force from the rudder to maintain a nice turn. the more angle of bank the greater the turn and the more lift lost to the force in the turn thus in a steep turn the need for more power and some backstick pressure. just step on the ball for powered aircraft and step on the space for a glider, well with a yaw string anyways.
Keep safe, keep flying, good luck
The magic answer is that the "relative airflow" over the vertical stabilizer has been changed which in turn causes the aircraft to weather cock in the direcion it is banked. The ruddr is onle there to counteract adverse yaw due to aileron drag which actually causes the aricraft to turn away from the direction fof the back.
