File:Voith schneider animation.gif: Difference between revisions

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imported>Caesar Schinas
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(== Summary == Importing file)
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== Summary ==
== Summary ==
{{Image notes wikimedia
Importing file
|Description=Voith Schneider Propeller animation, showing a top-down schematic view of a six-bladed Voith Schneider propeller. The approximate force on the water of each blade is shown by a blue arrow. The net force on the water is vertically upwards, indicating that the propeller itself is moving vertically downwards relative to the water.
 
The file was made with Pov-Ray version 3.6, with the source file:
 
<pre>
&#35;include &quot;colors.inc&quot;         
&#35;include &quot;shapes.inc&quot;
&#35;macro airfoil()
union
&#123;polygon
&#123;
120,
&lt;2.032241, -0.015403&gt;, &lt;2.033186, 0.002328&gt;, &lt;2.029376, 0.019655&gt;, &lt;2.020798, 0.036480&gt;,
&lt;2.007448, 0.052705&gt;, &lt;1.989329, 0.068240&gt;, &lt;1.966455, 0.082997&gt;, &lt;1.938845, 0.096893&gt;,
&lt;1.906529, 0.109851&gt;, &lt;1.869547, 0.121803&gt;, &lt;1.827947, 0.132683&gt;, &lt;1.781785, 0.142438&gt;,
&lt;1.731128, 0.151018&gt;, &lt;1.676052, 0.158386&gt;, &lt;1.616643, 0.164512&gt;, &lt;1.552998, 0.169374&gt;,
&lt;1.485222, 0.172964&gt;, &lt;1.413433, 0.175281&gt;, &lt;1.337759, 0.176334&gt;, &lt;1.258339, 0.176146&gt;,
&lt;1.175324, 0.174747&gt;, &lt;1.088878, 0.172180&gt;, &lt;0.999175, 0.168497&gt;, &lt;0.906403, 0.163761&gt;,
&lt;0.810764, 0.158046&gt;, &lt;0.712472, 0.151432&gt;, &lt;0.611756, 0.144010&gt;, &lt;0.508857, 0.135880&gt;,
&lt;0.404031, 0.127146&gt;, &lt;0.297549, 0.117920&gt;, &lt;0.189695, 0.108317&gt;, &lt;0.080768, 0.098457&gt;,
&lt;-0.028922, 0.088460&gt;, &lt;-0.139048, 0.078448&gt;, &lt;-0.249273, 0.068540&gt;, &lt;-0.359249, 0.058851&gt;,
&lt;-0.468615, 0.049493&gt;, &lt;-0.577002, 0.040570&gt;, &lt;-0.684035, 0.032176&gt;, &lt;-0.789332, 0.024397&gt;,
&lt;-0.892507, 0.017305&gt;, &lt;-0.993173, 0.010960&gt;, &lt;-1.090945, 0.005405&gt;, &lt;-1.185441, 0.000670&gt;,
&lt;-1.276287, -0.003234&gt;, &lt;-1.363118, -0.006310&gt;, &lt;-1.445582, -0.008582&gt;, &lt;-1.523342, -0.010087&gt;,
&lt;-1.596081, -0.010879&gt;, &lt;-1.663504, -0.011030&gt;, &lt;-1.725337, -0.010622&gt;, &lt;-1.781336, -0.009751&gt;,
&lt;-1.831284, -0.008524&gt;, &lt;-1.874995, -0.007055&gt;, &lt;-1.912315, -0.005464&gt;, &lt;-1.943121, -0.003875&gt;,
&lt;-1.967325, -0.002414&gt;, &lt;-1.984873, -0.001203&gt;, &lt;-1.995742, -0.000362&gt;, &lt;-1.999942, -0.000005&gt;,
&lt;-1.997516, -0.000238&gt;, &lt;-1.988536, -0.001154&gt;, &lt;-1.973103, -0.002838&gt;, &lt;-1.951344, -0.005359&gt;,
&lt;-1.923410, -0.008775&gt;, &lt;-1.889478, -0.013125&gt;, &lt;-1.849740, -0.018435&gt;, &lt;-1.804411, -0.024716&gt;,
&lt;-1.753718, -0.031961&gt;, &lt;-1.697903, -0.040152&gt;, &lt;-1.637220, -0.049252&gt;, &lt;-1.571931, -0.059213&gt;,
&lt;-1.502307, -0.069974&gt;, &lt;-1.428623, -0.081463&gt;, &lt;-1.351159, -0.093597&gt;, &lt;-1.270198, -0.106283&gt;,
&lt;-1.186023, -0.119424&gt;, &lt;-1.098920, -0.132912&gt;, &lt;-1.009171, -0.146639&gt;, &lt;-0.917059, -0.160490&gt;,
&lt;-0.822862, -0.174350&gt;, &lt;-0.726857, -0.188103&gt;, &lt;-0.629318, -0.201632&gt;, &lt;-0.530513, -0.214825&gt;,
&lt;-0.430707, -0.227568&gt;, &lt;-0.330162, -0.239755&gt;, &lt;-0.229131, -0.251282&gt;, &lt;-0.127866, -0.262051&gt;,
&lt;-0.026614, -0.271972&gt;, &lt;0.074387, -0.280959&gt;, &lt;0.174900, -0.288935&gt;, &lt;0.274696, -0.295831&gt;,
&lt;0.373550, -0.301584&gt;, &lt;0.471242, -0.306142&gt;, &lt;0.567561, -0.309462&gt;, &lt;0.662297, -0.311507&gt;,
&lt;0.755248, -0.312252&gt;, &lt;0.846218, -0.311679&gt;, &lt;0.935015, -0.309781&gt;, &lt;1.021455, -0.306557&gt;,
&lt;1.105359, -0.302018&gt;, &lt;1.186554, -0.296182&gt;, &lt;1.264873, -0.289076&gt;, &lt;1.340155, -0.280734&gt;,
&lt;1.412246, -0.271199&gt;, &lt;1.480999, -0.260522&gt;, &lt;1.546271, -0.248760&gt;, &lt;1.607929, -0.235976&gt;,
&lt;1.665845, -0.222243&gt;, &lt;1.719898, -0.207635&gt;, &lt;1.769974, -0.192235&gt;, &lt;1.815967, -0.176129&gt;,
&lt;1.857778, -0.159408&gt;, &lt;1.895313, -0.142167&gt;, &lt;1.928490, -0.124504&gt;, &lt;1.957230, -0.106520&gt;,
&lt;1.981465, -0.088317&gt;, &lt;2.001133, -0.069999&gt;, &lt;2.016181, -0.051671&gt;, &lt;2.026563, -0.033437&gt;
    pigment &#123;rgb &lt;0,0,0&gt;&#125;
translate &lt;-.5,.1,0&gt;
&#125;
disc
&#123;
&lt;0,0,.001&gt;,&lt;0,0,1&gt;,.1
pigment&#123;rgb &lt;1,1,1&gt;&#125;
&#125;
&#125;
 
&#35;end
&#35;macro arrow()
polygon
&#123;
8,
&lt;-.5,-.5&gt;,&lt;.5,-.5&gt;,&lt;.5,2&gt;,&lt;1.2,2&gt;,&lt;0,3.2&gt;,&lt;-1.2,2&gt;,&lt;-.5,2&gt;,&lt;-.5,-.5&gt;
pigment &#123;rgb &lt;0,0,1&gt; transmit 0.5&#125;
&#125;
&#35;end
&#35;macro prop_element(ang,xofs,yofs,rad)
union
&#123;
object
&#123;
airfoil()
rotate z*90
rotate z*-ang
rotate z*180*atan2(sin(ang*pi/180.0)-yofs,cos(ang*pi/180.0)-xofs)/pi
translate x*rad
&#125;
object
&#123;
arrow()
//scale &lt;cos(ang*pi/180),cos(ang*pi/180),1&gt;
scale &lt;.5+cos(ang*pi/180),.5+cos(ang*pi/180),1&gt;
scale .6
translate z*.3
rotate z*-ang
translate x*rad
&#125;
polygon
&#123;
4,
&lt;.4,0&gt;,&lt;-.4,0&gt;,&lt;-.1,rad&gt;,&lt;.1,rad&gt;
pigment &#123;rgb &lt;.6,.6,.6&gt;&#125;
translate z*-.1
rotate z*90
&#125;
rotate z*ang
&#125;
&#35;end
&#35;macro prop(xofs,yofs)
union
&#123;
&#35;declare ang=0;
&#35;while (ang&lt;360)
prop_element(ang+clock*6,xofs,yofs,5)
&#35;declare ang=ang+60;
&#35;end
disc
&#123;
&lt;0,0,.002&gt;,&lt;0,0,1&gt;,.6
pigment&#123;rgb &lt;1,1,1&gt;&#125;
&#125;
disc
&#123;
&lt;0,0,.001&gt;,&lt;0,0,1&gt;,1
pigment&#123;rgb &lt;.6,.6,.6&gt;&#125;
&#125;
&#125;
&#35;end
 
camera
 
&#123;
 
  orthographic
location &lt;0,0,10&gt;
right &lt;15,0,0&gt;
up &lt;0,15,0&gt;
look_at &lt;0,0,0&gt;
 
 
&#125; 
 
light_source
 
&#123;
 
&lt;0,0,40&gt;
 
White *2
 
shadowless
 
&#125; 
background &#123;rgb &lt;1,1,1&gt;&#125;
 
prop(.85,0)
</pre>
 
Pov-Ray was executed with the command
<pre>
povray +KFF10 +KI0 +KF9 +A0.1 +W240 +H240 -GA vs.pov
</pre>
The coordinates defining the shape of the blades are generated from a [[Joukowsky profile]]
|Year created=2008
|Real-named author=Christopher Johnson
|Author link=http://commons.wikimedia.org/wiki/User:Christopher_Johnson
|Wikimedia source page=http://commons.wikimedia.org/wiki/Image:Voith_schneider_animation.gif
|Notes=
|Other versions=
}}
 
== Licensing/Copyright status ==
{{CC|by-sa|3.0}}

Latest revision as of 18:51, 11 March 2022

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