Lots of ways to deal with that in theory. You could have the windmill store the energy in a spring and release it in a more powerful burst when it reaches a certain level. Another way would just be gearing it waaay down so the windmill can spin with very little force and the strandbeest just moves very very slowly.
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Now I am imagining a mars rover that works like one of these. Stampeding over the rocky landscape, powered by martian wind.
Given that Mars’ atmosphere density is only about one percent of Earth’s, that seems unlikely.
Lots of ways to deal with that in theory. You could have the windmill store the energy in a spring and release it in a more powerful burst when it reaches a certain level. Another way would just be gearing it waaay down so the windmill can spin with very little force and the strandbeest just moves very very slowly.