Hi Scrub. No, never seen a hydraulic capstan, but they did offer a Dowty hydraulic drum winch. I've heard of, but not seen, a hybrid winch that combined a capstan with a drum, the capstan pulled and the drum kept or tight. Also got it wrong in the last post, the R-O drum was smooth, the Rover was 9-sided. I didn't have too much faith in electric winches at one time, but there're some good units about now, and they're a damned sight easier to use than the older types for lighter applications, up to around 12,000lb line pull.