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We have computed wind models with time-dependent dust formation andgrain-size dependent opacities, where (1) the problem is simplified by assuminga fixed dust-grain size, and where (2) the radiation pressure efficiency isapproximated using grain sizes based on various means of the actual grain sizedistribution. It is shown that in critical cases, the effect of grain sizes canbe significant. For well-developed winds, however, the effects on the mass-lossrate and the wind speed are small.

Relaxing the Small Particle Approximation for Dust-grain opacities in Carbon-star Wind Models