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  1. cbooth

    Ellery Single Cylinder 50cc Design & Build

    Hi all, So this is going to be my design for a single cylinder 50cc petrol engine. I am going to use a lot of the same geometry as my Vtwin100, I'm sure you'll see the similarities. I have been using the same software to draw it up, Autodesk Inventor. Hopefully look to make some improvements...
  2. cbooth

    4 stroke spring selection

    Hi all, Anyone have any thoughts on the best way to select valve springs for 4 stroke gas engine. Its my own design 100cc and I have the valve lift determined, but not sure how to assess the required spring compression strength required. On my previous smaller engines I have made by trial and...
  3. cbooth

    Ellery V-Twin 100cc Design & Build

    Hi all, Thought I would put progress to date of my own design engine V-Twin, all things going well she will be used for an RC plane I am building. The engine specs so far are: Type: V-Twin gas Capacity: 100cc (2 x 50cc) Stroke: 3.9cm Bore: 4.0cm Compression Ratio: 8.5 Ignition: Spark I've been...
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