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Vintage RC Helicopters - Hirobo KV-107 Vertol HIROBO KV-107 Vertol
A successful twin rotor design that employed a complicated 'mechanical' mixer system, designed for the OS32 but this proved to be marginal in warm weather. Later model came with the option of fitting a 46 size engine then a further modification to electronic mixing (eccpm) and a bigger 50 size engine. Vertol build manual - Manual for early mechanical mixing (missing pages 12 to 16 inc) Vertol review June 1988 - Courtesy Model Helicopter World - www.modelheliworld.com
Check out this site - Steve's Vertol page - bit of an old site but has some useful video shots etc.
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