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Vector notation convention 3

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Arbalete

Arbalete

Aerospace
Dec 13, 2022
6
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Hopefully you mean z. Into the paper is a x surrounded by a circle, out of the paper is a circle with a dot in it. It's an arrow with a conical head and four flights.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376
 
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I agree entirely with Greg, but a non-Australian confirmation might be useful.
 
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Thanks for the quick replies.
It enables me to read the data correctly where a + or - can make a serious difference [bigsmile]

Stefan
 
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Same dot and X in US. OP - make sure you use the right hand rule for the z axis direction.
 
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to save downloading:
Vectors_gi2jc6.pdf_jcok1g.png


Also, that appears to be a left-hand rule coordinate system.

Typically choosing right-hand or left-hand makes the direction obvious. You can choose whatever convention you like for though the circle-X and circle-dot seem familiar.
 
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I've only ever heard of left hand rule for smoke doctors, the mechanical world seems to be right hand rule.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376
 
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As a mollydooker, I feel allowed to say that I find the use of left-handed axis systems a bit sinister.
 
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Left hand is used in computer graphics - XY plane is screen front from lower left corner, positive Z into the screen so all values are positive for visible objects.

 
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3D... I usually use a right hand coord system... it would be in the -x direction, and I'd show it as a dot; I think that's the international accepted useage. [pipe]

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik
 
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This is what the sketch looks where I need to figure out the direction of Z.

So this appears to be 'out if the paper'.

Bildschirmfoto_2022-12-14_um_09.31.53_at5h0k.png
 
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That looks like a horizontal stabilizer. Most aviation is

said:
The coordinate system convention used for most vehicles, including aircraft and automobiles, is based on an XYZ system originally developed for ships and boats. The X-axis of this system is positive pointing aft and is typically called the fuselage station (FS) in the case of an aircraft. The Z-axis is positive pointing upward and is known as the water line (WL). To complete a right-handed coordinate system, the Y-axis is positive pointing along the plane's right wing. The Y-axis is usually called the butt line (BL) but is sometimes referred to as the wing station (WS) as well. The latter name is probably less common since it can be confusing for military aircraft where pylons and other hardpoints are often called weapon stations.
Click to expand...

 
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Yup, that's right hand rule. Curl your right hand into a fist, your fingers point from x to y and your thumb points along the Z+ axis. Some of us might visualise this with a corkscrew.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376
 
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GregLocock said:
Hopefully you mean z. Into the paper is a x surrounded by a circle, out of the paper is a circle with a dot in it. It's an arrow with a conical head and four flights.
Click to expand...

BrianE22 said:
Same dot and X in US. OP - make sure you use the right hand rule for the z axis direction.
Click to expand...

That's exactly how I've always seen it. US here also.

In a world of various conventions, at least this one might be consistent! I find some strange comfort in that. LOL
 
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