Having wrung out a sport aircraft or two, many modellers decide that they want to build and fly something more challenging. This often leads to fantasies of flying a sleek scale job, a design that will more than likely date from W.W.II or later, and whose full-size counterpart will have been fitted with a retractable undercarriage. Nothing looks worse than a Spitfire flying around with a fixed undercarriage, so to do such a model justice we must fit retracts. But which type to install, and how do they operate?
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