Perhaps the poster was a bit in error regarding the length, but Hunter did build bilge keels.
HUNTER DUETTE
Launched in the mid-1980s, this was a makeover of the British 22ft Hunter Sonata one-design raceboat that was intended to boost the design’s appeal to cruising sailors.
The boat was already well proven, with a reputation for easy and predictable handling, allied to a powerful rig that offered good performance in light airs. The updated design sought to retain these properties while also offering the benefit of twin keels for reduced draught (0.9m/3ft instead of 1.27m/4ft 6in) and the ability to dry out at low tide in suitably sheltered harbours and beaches.
A similar righting moment to the fin-keel version was achieved by increasing the ballast ratio to 55 per cent – one of the highest figures of any cruising yacht. The result was a boat that was significantly faster than other bilge keelers of a similar size (and indeed some fin-keel models) but retained its excellent handling characteristics, as designer David Thomas intended. Indeed, when sailing downwind the Duette proved to have better directional stability than the Sonata, thanks to the two keels.
The Duette followed the earlier Horizon 26, which itself was based on the earlier Hunter Delta. Subsequently a number of other British Hunters sprouted twin keels with a similar aim, including the Horizon 30, and the Channel 27, 31 and 323. All offered a similar appealing combination of easy handling and performance that often exceeded that of fin-keel designs of a similar size.