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  1. Peter Twissell

    Whittle V8

    This is a mostly retrospective build thread, as I started in March and the engine is now complete. I detailed the build on the Whittle V8 group here: [email protected] | Topics I have built the engine mostly to Eric Whittles drawings, but with a few variations of my own. The crankcases start...
  2. Peter Twissell

    Two Stroke Reed Valve Material

    What does anyone use to make model size reed valves? I need to make valves about twice the size of those found in Cox .049 engines, which I think are made in both steel and Mylar. The Cox valves operate slightly differently to conventional reeds - they are not fixed at any point, but are allowed...
  3. Peter Twissell

    Radial Engine balance calculator

    Spreadsheet to calculate balance of a radial engine. Enter values for your engine in column C. If you select 'corrected' slave rod pin angles, they are calculated automatically. The first graph shows piston displacements from TDC. The second shows the motion of the centre of mass of each of the...
  4. Peter Twissell

    Electroforming - thin walled copper parts from 3D prints

    Following my first foray into electroforming, I shall attempt to collect my experiences here in order that anyone with an interest can assess whether the process is suitable for their part. I find it useful to begin with a summary of the process and applications: Electroforming material, for...
  5. Peter Twissell

    A 15cc sidevalve opposed twin

    Combining my hobbies of RC model flying and model engineering, I have designed an engine for my next aircraft model. The aircraft is a well established design (Chris Foss Acro Wot) and is intended to use engines from 6cc 2 stroke to 15cc 4 stroke. I don't hold out hope for impressive power...
  6. Peter Twissell

    Simplified Monosoupape

    Among my various projects, I would like to build engines for flying models. Being keen on early aviation, it would be nice to build a proper rotary, but all the designs I've seen are quite large and I don't want to build a huge model to house it. So I looked at the possibility of building a...
  7. Peter Twissell

    Cheap tool dodge

    Being a miserly old skinflint, I am averse to buying expensive tools which I may only use a few times when I can improvise. In this case, I needed to create 'fishmouth' ends on some short sections of stainless tube for the exhaust collector ring for my radial engine. I used a cheap hole saw, set...
  8. Peter Twissell

    A gert big radial

    At some point in 2013, it occurred to me to build a radial engine. The decision was inspired by the engines on two Stearman biplanes which are resident at the airfeld where I keep my microlight. So, I started considering how I would make the major parts and what the aim of the engine was to be...
  9. Peter Twissell

    Making a distributor cap

    As the title suggests, I need to manufacture a distributor cap for my freelance 7 cylinder radial engine. When I drew the design for the distributor a few years ago, the plan was to mould it in phenolic resin, selected for its dielectric constant and resistance to water absorption. At that time...
  10. Peter Twissell

    Hello from Norfolk, UK

    Hello engine builders. I have worked as an engineer for almost 40 years and built various model steam engines model aircraft, fullsize motorcycles and assorted 'gadgets' in my own workshop for most of that time. My current project is a freelance 7 cylinder radial engine. At 2.3 litres capacity...
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