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	<title>Mikael Tulldahl &#187; Linefollower</title>
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	<link>http://www.mikaeltulldahl.se</link>
	<description>My projects, thoughts &#039;n stuff</description>
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		<title>Linefollower airflow simulation</title>
		<link>http://www.mikaeltulldahl.se/robots/linefollower-airflow-simulation/</link>
		<comments>http://www.mikaeltulldahl.se/robots/linefollower-airflow-simulation/#comments</comments>
		<pubDate>Sun, 13 Oct 2013 22:39:25 +0000</pubDate>
		<dc:creator><![CDATA[Mikael Tulldahl]]></dc:creator>
				<category><![CDATA[Linefollower]]></category>
		<category><![CDATA[Robots]]></category>

		<guid isPermaLink="false">http://www.mikaeltulldahl.se/?p=23</guid>
		<description><![CDATA[i did a quick and dirty check on how the undercarriage shape affects the pressure and thus the downforce. what i wanted to know was: can you assume that the pressure difference the fan creates is maintained under the entire hood, or is the vacuum decreasing towards the edges &#8211; and what kind of downforce can be expected? i&#8217;ve learnt that the shape of the underside of the hood plays a major role in the downforce generated, as you can see in the picture bellow, the fan creates a difference of about 300Pa, but the major part of the undercarriage is only experiencing a mere 60 Pa pressure difference. more investigation needed!]]></description>
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		<title>Linefollower beginning calculations</title>
		<link>http://www.mikaeltulldahl.se/robots/linefollower-beginning-calculations/</link>
		<comments>http://www.mikaeltulldahl.se/robots/linefollower-beginning-calculations/#comments</comments>
		<pubDate>Sun, 13 Oct 2013 22:02:33 +0000</pubDate>
		<dc:creator><![CDATA[Mikael Tulldahl]]></dc:creator>
				<category><![CDATA[Linefollower]]></category>
		<category><![CDATA[Robots]]></category>

		<guid isPermaLink="false">http://www.mikaeltulldahl.se/?p=21</guid>
		<description><![CDATA[since competing at RobotChallenge 2013 in Vienna with Sleipner and Lilla Lisa, i&#8217;ve got more and more excited about building a linefollower. initial design-goals ( preliminary) 200g mass 3g acceleration sideways as well as accelerating/deaccelerating (all the way up to top-speed) more than 5m/s top speed vacuum fan. probably a 35-27mm EDF size of max 25 x 25 cm to be able to compete in Robot-SM, Stockholm Robot Championship, Robotex and RobotChallenge (just for calculations) wheel radius: 1cm 2s lipo rought estimate of suitable components: rpm on wheels at 5m/s: 4800rpm since 2s lipo &#8211;&#62; ca 7.4 volt system &#8211;&#62; 4800/7.4=650kv on motor or equivalent with gearbox power out of engine at 5m/s, 3g(=30m/s^2): P=F*V=m*a*V=5*30*0.2 =30W = 15W per motor since there is no lightweight 650kv, 15w motors, i&#8217;ll have to use a gearbox. i like brushless outrunners, there are lots of variations but i&#8217;ve found some ca 10g 15W motor with about 2000kv, so a gear ratio of about 3:1 is needed. 2s lipo ,350mah, 65c 130c burst = 22A continous= 170W kont, 34g. http://www.hobbyking.com/hobbyking/store/__19117__Turnigy_nano_tech_350mah_2S_65_130C_Lipo_Pack.html ESC wheel engines: 2s, 10A, 8g http://hobbyking.com/hobbyking/store/__23766__HobbyKing_Brushless_Car_ESC_10A_w_Reverse.html ESC EDF: 10A, 9g http://www.hobbyking.com/hobbyking/store/__659__TowerPro_9g_w12A_Brushless_Speed_Controller.html EDF: 27mm, 2s, 5.5A, 40W, 8g &#160; wheel motors: http://www.hobbyking.com/hobbyking/store/__5358__18_11_2000kv_micro_brushless_outrunner_10g_.html CAD for motors: https://grabcad.com/library/micro-brushless-motor-1 axle: bearings: http://www.kullager.se/sv/product/501/Kullager-623-3x10x4 &#160; so far it seems as if 200g total is a reasonable and achievable goal. i will research more what kind of &#8220;diffusor&#8221; style undercarriage is the best shape to get as much downforce as possible with the EDF as a vacuum fan.]]></description>
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