Tony Verhulst wrote:

Why are these two stroke engines so notoriously unreliable?

In many cases, I'm sure, it's because they don't run often enough.

I think this is especially likely to be true for sustainer engines,
which are only used for a (rare?) self-retrieve, unlike the
self-launchers which are usually run each flight for the launch. That's
why I think many pilots would be interested in the greater reliability
an electric sustainer could provide, even with a reduced range compared
to a gas engine.

--
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Eric Greenwell - Washington State, USA

www.motorglider.org - Download "A Guide to Self-launching Sailplane
Operation"