Bob Babcock wrote:

It would seem that the mono wheel would have far superior drag
reduction than conventional landing gear. It also seems it would be
much harder to operate on the ground. Any insights would be
appreciated.

It would be better to find out how the particular glider you are
interested in operartes, rather than wonder in general about "monowheel"
glilders. For example, all self-launching sailplanes (PIK-20E, ASH 26 E,
DG 400/800, etc) are monowheel gliders; they can all taxi - some much
better than others. Generally, the major limitation is the taxiway width
required (half a span), but this can often be dealt with by taxiing on
the runway. Secondary is crosswinds, which conventional gear can handle
better if the two wheels have independent brakes.

Ask an owner!

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Eric Greenwell
Washington State
USA