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I have studied the curved turnouts from the Hornby website. Apart from having strange arcs (22.5°ext. and 33.75°int.) the turnouts should be no different from other manufacturers' principles, i.e. the external leg is a straight equivalent to the distance between track centers plus a standard
1/4 r.angle arc, and the internal leg a constant radius arc. We know the internal leg is 438 mm radius because there is a compensation track of 11.25° in such radius. There is no point making it in 505 mm radius.
One can so develop the junction from single to parallel tracks in a 90° arc.
Cheers from Dario
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