Borderer
- A vertical slide valve twin cylinder launch engine with Stephenson Reverse Gear
- Designed by J Bertinat
- Also available as piston valve. Designed for 2-channel radio control systems on both speed and direction
- Described in Model Engineer Vols 163 to 165
- Length: 6 1/4"
- Height: 5"
- Width: 3"
- Cylinders: 1/2" or 5/8" bore, 1/2" or 5/8" stroke
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