<p class="MsoNormal" style="margin: 0in 0in 10pt"><span style="line-height: 115%; font-family: ">hi guys,
i am relatively new here. I got to RCU by doing a google search for “cdi for model airplanes”. I soon after joined the group. I have a friend that taught me to fly that had a ch ignition (mechanical advance) system on his plane. It was timed such that when idling, there was barely enough momentum to get to TDC before it would fire. sounded awesome!. i have read 3 threads (totalling well over 2000 post's)on the cdi. this has taken a couple of weeks, with numerous foray’s to other pages via the links. My eyes hurt<span style="mso-no-proof: yes"><shapetype id="_x0000_t75" stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" coordsize="21600,21600"></shapetype> <stroke joinstyle="miter"></stroke><formulas></formulas><f eqn="if lineDrawn pixelLineWidth 0"></f><f eqn="sum @0 1 0"></f><f eqn="sum 0 0 @1"></f><f eqn="prod @2 1 2"></f><f eqn="prod @3 21600 pixelWidth"></f><f eqn="prod @3 21600 pixelHeight"></f><f eqn="sum @0 0 1"></f><f eqn="prod @6 1 2"></f><f eqn="prod @7 21600 pixelWidth"></f><f eqn="sum @8 21600 0"></f><f eqn="prod @7 21600 pixelHeight"></f><f eqn="sum @10 21600 0"></f><path gradientshapeok="t"></path><lock aspectratio="t"></lock><shape id="Picture_x0020_1" type="#_x0000_t75" alt="http://www.rcuniverse.com/forum/
js/punymce/plugins/emoticons/img/trans.gif" style="width: 0.75pt; height: 0.75pt; visibility: visible; mso-wrap-style: square"></shape><imagedata src="file:///C:\Users\User\AppData\Local\Temp\msohtmlclip1\02\c lip_image001.gif"></imagedata></span>! i recently made it known to some friends that i use weedeater engines in a plane i am building and viola, i now have 5 weedeaters to convert to rc. a rear carb ryobi, a couple of stihl’s and a couple of homelite’s.<span style="mso-spacerun: yes"> </span>all 2 stroke. i plan to use CDI with advance instead of the magneto. i originally planned to use a mechanical advance, along with the circuit posted by gr8flyer55 back around post #690 in the previous thread, since most of the discussions here were about issues with the programming the timing board. but after some thought and reading a few tutorials online about programming a PIC, i think i can do it! I think it is important to know that if it were intended for this project to be for the AVERAGE RC enthusiast, then much more work is to be done. RC modelers/flyers are by their very nature, a tinkerer. However; not all are electrical engineers. I myself survived school long enough to get an engineering degree and further proved my tenacity by getting a P.E license (mechanical engineering).<span style="mso-spacerun: yes"> </span>I know just enough about electronics to be truly dangerous. I can wire a house, wire a vehicle and have even replaced the capacitors in the jeep ECU. but I have no idea WHY the components for the CDI were chosen, what avalanching is, why tantalum capacitors are better or worse than electrolytic etc, etc.</span>
</p><p class="MsoNormal" style="margin: 0in 0in 10pt"><span style="line-height: 115%; font-family: ">What is truly needed now is a tutorial on how to really build this system. this was requested by gompy back in post #313. I don’t remember seeing it anywhere. there was more than one request for photos of working systems on airplanes and I don’t remember seeing them either? is this all top secret? come on guys, pics. now for the fun part.</span>
</p><p class="MsoNormal" style="margin: 0in 0in 10pt"><span style="line-height: 115%; font-family: ">looking at gompy’s site. I click on the link for weedeater and see the schematic dated 09/19/2010<span style="mso-spacerun: yes"> </span>rev A3, however; I have never seen a parts list with complete part numbers. a quick look at digikey or allied shows numerous BT151’s and likewise for tip3055. does anyone have a parts list for us non-electrical types?</span>
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