Questions about angles in flight

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juwong

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as most know, when we want to describe the attitude of crafts in flight, 'pitch, roll, yaw' angles and angle rates are mentioned. <br />i take some information the ' bank angle' and 'heading angle' are referred. i want to know what do they mean?<br />thanks for your help!
 
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qso1

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First image example is yaw. The shuttle yaws left of port in this example. Yaw angle is 20 degrees. If it were 180 degrees the noise would swap with the tail. <div class="Discussion_UserSignature"> <p><strong>My borrowed quote for the time being:</strong></p><p><em>There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened.</em></p> </div>
 
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qso1

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Next up is pitch. Bottom shuttle is straight and level. Top shuttle is pitch angle, down...negative 25 degrees. If the nose were up, it would be positive pitch angle. <div class="Discussion_UserSignature"> <p><strong>My borrowed quote for the time being:</strong></p><p><em>There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened.</em></p> </div>
 
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qso1

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Finally roll or bank. When flying aircraft, the maneuver is considered to be banking. While spacecraft it is considered roll. This is probably because spacecraft can be rolled through 360 degrees or more. Some aircraft can be rolled safely as well in flight. Barrel roll as an example.<br /><br />It should also be noted that combination maneuvers are possible such as roll 10 degrees, yaw 33 degrees, pitch 12 degrees.<br /><br />Hope these examples clear it up for you. <div class="Discussion_UserSignature"> <p><strong>My borrowed quote for the time being:</strong></p><p><em>There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened.</em></p> </div>
 
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juwong

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Qso1, <br />thanks very much. the words you mentioned here are indeed very helpful!<br />personally, i was doing aerodynamics in my university time. i got the base of it.<br />then you do the explanation which makes me fly up high to a new level...thanks.<br />Then, <br />the bank is referred to the roll with respect to the aircraft and spacecraft respectively,<br />the heading angle must be the yaw angle.<br />when someone says ' pitch, yaw, roll' , i know it; but confused confronting ' bank , heading'..<br />hehe..<br />glad to meet you. <br />Some day we meet, i'd like to invite you to a cafe.:)
 
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derekmcd

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An airplanes pitch, roll, and yaw will not give you it's heading. Pitch, roll, and yaw as QSO1 perfectly described are nothing more than an airplanes orientation on an x,y,z axis. The airplanes 'heading' is nothing more than the direction it is traveling towards.<br /><br />As much as the pilot might try to avoid... the airplane could be upsidedown (180 degree roll), backwards (180 degree pitch) and with a yaw of 180 degrees (also backwards)... but be at a heading of zero (traveling in the complete opposite direction the plane is facing). <div class="Discussion_UserSignature"> <div> </div><br /><div><span style="color:#0000ff" class="Apple-style-span">"If something's hard to do, then it's not worth doing." - Homer Simpson</span></div> </div>
 
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derekmcd

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Ignore my last post. Completely wrong. No doubt someone with knowledge better than mine can explain it. I think I confusted 'heading' with 'bearing. Replace the word "heading" in my last post with "bearing" and it might make sense. "Heading" is actually the direction the plane is pointed towards, but not necessarily the direction it is travelling (bearing). <br /><br />Did I get it right this time? <img src="/images/icons/smile.gif" /> <div class="Discussion_UserSignature"> <div> </div><br /><div><span style="color:#0000ff" class="Apple-style-span">"If something's hard to do, then it's not worth doing." - Homer Simpson</span></div> </div>
 
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qso1

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You were right about heading being the direction the plane is travelling in. In fact, the description you gave can actually describe a nominal shuttle mission. The shuttle most often points payload bay down and sometimes its tail is travelling towards its heading or direction of flight.<br /><br />Bearing is a nautical term IIRC but I'm not absolutely certain what bearing refers to but I think it too refers to direction. <div class="Discussion_UserSignature"> <p><strong>My borrowed quote for the time being:</strong></p><p><em>There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened.</em></p> </div>
 
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vandivx

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"The shuttle yaws left of port in this example."<br /><br />port really makes no sense with something like shuttle, on sea going ships it is I believe the 'port side', that is the side the ship docks to port molo which is the left side as you look forward on the ship (towards bow?) Right? somehow I think it should be the other way around, port side might be on right side LOL<br />I tried to imagine which side ships in movies dock on and that seems to be with left side, same as trains have doors too, come to think of it they have them on both sides<br /><br />I think aft is back and starboard is the right side of the boat, opposite of the port side, that's my feeble knowledge of it<br /><br />vanDivX <div class="Discussion_UserSignature"> </div>
 
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qso1

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Your right, port is the left side looking towards the bow and while it may not make as much sense for shuttle. The whole port starboard nautical terminology was picked up by the aircraft pioneers and industry decades ago and NASA simply adapted it for spacecraft.<br /><br />Your right also about aft being the rear and starboard being the right side or opposite port whether on ships or shuttle. <div class="Discussion_UserSignature"> <p><strong>My borrowed quote for the time being:</strong></p><p><em>There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened.</em></p> </div>
 
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vandivx

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thx, it pays to watch those pirate ship movies, never know what comes handy <img src="/images/icons/smile.gif" /><br /><br />(bigger) aircraft, mainly manned rockets are also called airships <br /><br />vanDivX <div class="Discussion_UserSignature"> </div>
 
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