JavaPipe: Tuned Pipe Designer

<body> <p>Diese Seite verwendet Frames. Frames werden von Ihrem Browser aber nicht unterstützt.</p> <table border="0" width="100%" cellspacing="0" cellpadding="4"> <tr> <td width="50%"> <h2 align="center">The Tuned Pipe Designer</h2> </td> <td width="50%"> <h2 align="center"><a href="javapipe_main_de.htm">This Page in in German</a></h2> </td> </tr> </table> <p align="center"> <applet code="TunedPipeDesign.class" archive="java/javapipe.jar" align="baseline" hspace="2" vspace="2" width="600" height="450"> <PARAM name="permissions" value="sandbox"> This space is reserved for a JAVA applet, which cannot be displayed by your browser.<br> You might be able to get an updated version of your browser to display the applet. </applet> </p> <p>This small Java applet uses design rules according to [<a href="biblio.htm#LitKrause1">22</a>], [<a href="biblio.htm#LitJennings1">23</a>], and [<a href="biblio.htm#LitBönsch1">24</a>], to size a tuned pipe for a 2 stroke piston engine. The calculations are assuming a speed of sound in the exhaust gas, which is not known exactly; also, it depends on the temperature and thus on fuel/air mixture and external conditions. In this applet, the gas conditions for methyl alcohol (methanol) and gasoline have been implemented. The results of the calculations can be used as a good starting point for experiments and fine tuning, deviations of +/-10% are surely possible.</p> <h3>Usage</h3> <ul> <li>Measure the timing of your engines <u>exhaust</u> and <u>transfer</u> ports in degrees (see below).</li> <li>Measure the dimensions and calculate the area of the exhaust port opening in the sleeve.</li> <li>Assume the velocity of rotation of your engine in rpm (dreaming doesn't help much though).</li> <li>Either: <ul> <li>use the sliders to adjust the values according to your engine, or</li> <li>enter the corresponding values into the text fields and press [enter] to update the graph.</li> </ul> </li> <li><em>Printing</em> and <em>Exporting</em> only works, after you have adjusted the appropriate Java security settings of your browser.<br> You could create a hardcopy of the program window, though, using your systems suitable tools.</li> <li>You can manually plot the cones to build a paper model or to transfer the shape onto sheet metal by using the values of <em>R</em> and <em>phi</em> noted below each cone. Plot two concentric circles (having the same center) using the two radii R. The flattened cone spans a segment with an opening angle of phi degrees between the two circles.</li> <li>The <em>Print...</em> command will print a scaled version of the cones. The <em>Export...</em> command will create two AutoCad compatible DXF files for the two cones.</li> </ul> <div align="left"> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td> <h3>Determining the Timing</h3> <h3> <img src="images/engine_timing.gif" alt="timing.gif (60202 Byte)" width="120" height="100"></h3> </td> <td>The animation shows, how to measure the timing angles of exhaust and transfer port. These angles define how long the ports are open, expressed in crankshaft angle. You can attach a disk with divisions in degrees to the crankcase and a pointer to the crankshaft (or vice versa).<br> Then you adjust disk and pointer so that the it indicates 180° when the piston is at its bottom dead center. Now you turn the crankshaft until the port of interest closes (when the piston crown arrives at the upper edge of the port). It is helpful to point a flashlight or a halogen lamp through the plug hole or to remove the cylinder head.<br> Reading the angles in both directions must be symmetrical to the bottom dead center, e.g. a port opening at at 100° must be closing again at 360°-100° = 260°, as shown in the animation. The port timing angle (shown in blue) is then 260° - 100° = 160°. This means, that port is open while the the crankshaft turns 160°.<br> Usually the transfer port will have a shorter timing than the exhaust port.</td> </tr> </table> </div> <hr> <h3>Background</h3> <p>Used Formulas (a mixture from [<a href="biblio.htm#LitKrause1">22</a>], [<a href="biblio.htm#LitJennings1">23</a>], and [<a href="biblio.htm#LitBönsch1">24</a>]):</p> <div align="left"> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td width="50%" align="center"> <img src="images/tpiped1.gif" alt="some formulas" align="middle" width="150" height="217"> <p><font size="1"><em>(metric units)</em></font></td> <td width="50%"><img src="images/tpiped2.gif" align="middle" width="362" height="287"></td> </tr> </table> </div> <p>The opening angles of the cones should be 4° to 10° for the opening cone and approximately twice this value for the closing cone.</p> <table border="0" width="100%"> <tr> <td align="center" width="50%"><font size="2"><em> <img src="images/tpiped3.gif" width="390" height="171"><br> Cut view of a tuned pipe with silencer.</em></font></td> <td align="center" width="50%"><em><font size="3"> <img src="images/tpiped4.gif" width="401" height="180"></font><font size="2"><br> Enlarged view of the muffler section.</font></em></td> </tr> </table> <p><em>see also:<br> <a href="pylon_engines.htm">F3D Pylon Racing Engines</a> with some engines optimized for tuned pipes,<br> <a href="http://geocities.com/CapeCanaveral/Galaxy/4707/speed/spdindx.htm"> Peter Soule's documentation</a> to learn more about the history of tuned pipes for model engines,<br> my <a href="software.htm">Silencer Application</a> software, including a similar tuned pipe designer.</em></p> <hr> <h3>How to download JavaPipe to use as a standalone Application</h3> <p><em>Remark:  to use JavaPipe in the standard way in your browser, over the internet, it is not necessary to perform the procedures described in this section. I cannot give much support to solve any problems occurring while running your local copy based on your local Java installation. If you have not already a working Java system on your machine, you might want to consult a computer guru.</em></p> <p>If you want to run your local copy of JavaPipe , you can download a copy of the JavaPipe archive to your disk. You can also save the applet page to a local file, depending on the method you want to use for running you local copy.</p> <h3>Step by Step Instructions to download the required files</h3> <ul> <li>Check, whether you have a Java virtual machine (VM) installed on your system. <ul> <li>Windows: open a command window and execute the commands <strong>jview</strong> and <strong>wjview</strong>. Usually a Java VM can be installed during the installation or when upgrading the Microsoft Internet Explorer.</li> <li>Unix: open a shell or xterm window and execute the command <strong> java</strong>.</li> </ul> </li> <li>If these commands can be found, your system probably has a working Java installation. If not, you will have to get the appropriate Java Runtime Environment (JRE) for your system from Suns web site <a href="http://www.java.com/download">http://java.sun.com/</a>.</li> <li>Download this html file from <script LANGUAGE="javascript">  </script> </li> <li>Download the ZIP archive with the class tree from the following web address: <script LANGUAGE="javascript">  </script> </li> <li>Create a subdirectory "java" below the directory, where you have copied this html file and move the <em>javapipe.zip</em> file into this directory.<br> <br> </li> <li>Now you have both files to run JavaPipe either as an applet or a standalone application. You can run the applet by loading this html page into your browser or by using the AppletViewer.<br> [<a href="jp_applet_or_application.htm">More details can be found here</a>].<br> <br> </li> <li>To make life for Windows users easier, you can download the following VBScript file to start JavaPipe as a stand alone application:<br> <script LANGUAGE="javascript">  </script> Using this script and the archive, you can run JavaPipe by merely clicking onto the .vbs file.<br> <br> </li> <li>To make life for Windows users even easier, you can also download the following Windows Installer file which contains all you need and installs it correctly:<br> <script LANGUAGE="javascript">  </script> To re-install or de-install use the "Software" applet inside the System Control Program of Windows.<br> </li> </ul>  <SCRIPT language="JavaScript">  </SCRIPT> <P align="center"><FONT size="2"><EM>Last modification of this page: 21.05.18</EM></FONT></P> <P align="center"> <IMG border="0" src="images/footer_line.jpg" width="100%" height="8"></P> <P align="center"><FONT size="2">[<A target="_top" href="index.htm">Back to Home Page</A>] <STRONG>Suggestions? Corrections? Remarks? e-mail: <A href="javascript:asfdrg(zzyzz())" onmouseover="return lkiuzt(zzyzz())" onmouseout="return hzqpop()"> Martin Hepperle</A>.</STRONG></FONT></P> <P align="left"><FONT size="2">Due to the increasing amount of SPAM mail, I have to change this e-Mail address regularly. You will always find the latest version in the footer of all my pages.</FONT></P> <P align="center"><FONT size="2">It might take some time until you receive an answer and in some cases you may even receive no answer at all. I apologize for this, but my spare time is limited. If you have not lost patience, you might want to send me a copy of your e-mail after a month or so.<EM><BR> </EM><EM>This is a privately owned, non-profit page</EM> of purely educational purpose. Any statements may be incorrect and unsuitable for practical usage. 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