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#1
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Slips and skids
I have heard definitions for both, but I'm still confused. Anyone
care to elaborate? Wil |
#2
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Slips and skids
On Mar 16, 9:38*am, William Hung wrote:
I have heard definitions for both, but I'm still confused. *Anyone care to elaborate? In a skid the ball is deflected to the outside of the turn and in a slip it's to the inside. Since you "step on the ball" with the rudder, it foillows that a skid occurs when there is too much yaw in the direction of turn (like a car rear end breaking away) and a slip when there is not enough. Hope this helps. Cheers. |
#3
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Slips and skids
On Mar 15, 7:49*pm, WingFlaps wrote:
On Mar 16, 9:38*am, William Hung wrote: I have heard definitions for both, but I'm still confused. *Anyone care to elaborate? In a skid the ball is deflected to the outside of the turn and in a slip it's to the inside. Since you "step on the ball" with the rudder, it foillows that a skid occurs when there is too much yaw in the direction of turn (like a car rear end breaking away) and a slip when there is not enough. Hope this helps. Cheers. Heh. Except when the control system is misrigged like a plane I flew recently. In order to get a coordinated turn, I had to give "top" rudder in a turn. That's wrong. Of course the actual rudder must have been bottom, but, it was bad. If you want a great explanation (and a GREAT) book on flying, get Rich Stowell's "Emergency Maneuver Training". It has nice drawings illusatrating rudder and aileron positions in both slip and skid. Plus an explanation about why your life depends on knowing the difference when you're in the pattern or otherwise low to the ground and at relative high AoA. |
#4
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Slips and skids
On Sat, 15 Mar 2008 13:38:20 -0700 (PDT), William Hung
wrote: I have heard definitions for both, but I'm still confused. Anyone care to elaborate? To me the easiest analogy is to think of a road that has a steep banked turn covered with ice. If you go around it too fast you will "skid" to the outside. If you go too slow you will slip down hill to the inside. In the case of the airplane too much rudder to the inside will make you fell like you are being pushed to the outside and the plane will be skidding to the outside. Not enough rudder and the nose will drop in the turn. so you add rudder to raise the nose and you feel like you are pressed against the lower side of the plane which is now slipping down hill. Wil Roger Halstead (K8RI & ARRL life member) (N833R, S# CD-2 Worlds oldest Debonair) www.rogerhalstead.com |
#5
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Slips and skids
Not enough rudder and the nose will drop in the turn. so you add
rudder to raise the nose and you feel like you are pressed against the lower side of the plane which is now slipping down hill. Are you sure? I think the more bottom rudder you give in a turn, the more the nose will appear to move lower against a given horizon. All the rudder does is pull the plane around an axis from ear-to-ear. So if you give too much bottom rudder, the nose will appear to drop in a turn. If you give top rudder, you'll have the nose "rise" against the turn. The classic case of skid is when too much bottom rudder is given, the nose swings around the ear-to-ear axis, yawing past coordinated turn; and if the pilot pulls back on the elevator to "raise" the nose back up, it increases AoA, things could be getting dangerous ... |
#7
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Slips and skids
You guys are talking about airplanes. You have to think about all the other
factors associated with engines, like "p" factor and torque, and then wing wash in and out, offset rudder, etc. Then consider the differences in shallow, medium and steep turns (please look up the definitions, if it's unclear) where control forces are again difference. It is helpful to take some glider lessons which removes some of these variables. In an airplane, holding top rudder in a turn was probably not your imagination. In one direction this is normal and you can experience it also in one end of the Lazy eight exercise. I think it is also a commercial written exam question and It will almost certainly come up on the commercial oral. Hint: Think "P' factor, low speed, high angle of attack, high power setting. I'll leave it to you guys to discuss this further. -- BobF. "Roger" wrote in message news On Sat, 15 Mar 2008 22:57:41 -0700 (PDT), wrote: Not enough rudder and the nose will drop in the turn. so you add rudder to raise the nose and you feel like you are pressed against the lower side of the plane which is now slipping down hill. Are you sure? I phrased tht badly but it is an anology. Stick with the car on the sliper y road:-)) I think the more bottom rudder you give in a turn, the more the nose will appear to move lower against a given horizon. All the rudder does is pull the plane around an axis from ear-to-ear. So if you give too much bottom rudder, the nose will appear to drop in a turn. If you give top rudder, you'll have the nose "rise" against the turn. The classic case of skid is when too much bottom rudder is given, the nose swings around the ear-to-ear axis, yawing past coordinated turn; and if the pilot pulls back on the elevator to "raise" the nose back up, it increases AoA, things could be getting dangerous ... Roger Halstead (K8RI & ARRL life member) (N833R, S# CD-2 Worlds oldest Debonair) www.rogerhalstead.com |
#8
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Slips and skids
On Mar 15, 10:57 pm, wrote:
I think the more bottom rudder you give in a turn, the more the nose will appear to move lower against a given horizon. All the rudder does is pull the plane around an axis from ear-to-ear. The rudder is intended to control adverse yaw, not to turn the airplane. Banking the airplane turns it. Some airplanes, the "idiot- proof" ones, sometimes need no rudder at all in a turn. Dan |
#9
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Slips and skids
On Mar 15, 9:23 pm, wrote:
Except when the control system is misrigged like a plane I flew recently. In order to get a coordinated turn, I had to give "top" rudder in a turn. That's wrong. Is that the one in which I suggested a broken rudder bar spring? Anything come of that? Dan |
#10
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Slips and skids
On Mar 16, 3:41 pm, wrote:
On Mar 15, 10:57 pm, wrote: I think the more bottom rudder you give in a turn, the more the nose will appear to move lower against a given horizon. All the rudder does is pull the plane around an axis from ear-to-ear. The rudder is intended to control adverse yaw, not to turn the airplane. Banking the airplane turns it. Some airplanes, the "idiot- proof" ones, sometimes need no rudder at all in a turn. Dan Actually, I beg to differ. Banking rotates the airplane about its longitudinal axis. Yawing rotates about its vertical axis. Neither of these causes the airplane to change heading. It is the aerodynamic forces that streamlines the airplane with the relative wind is what makes it turn (ie weather vaning). For comparison, think of the space shuttle banking or yawing in orbit. This does not change its heading because there is no streamlining effect. |
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