David, I wonder if the perception by some people that crow allows them to fly slower is purely psychological? Crow will produce a nose up force, either trimming the plane nose up or reducing the nose down pitch. Either way the model flier is not having to haul back so far on the stick to maintain the attitude down the approach, and the plane responds more easily to pulling back in the flare. Because it is in effect given a lot of up trim it is trimmed to fly slower, and this makes them think it is capable of flying slower when actually it is simply that they are not comparing like trim with like trim.