Do-17 video by Tinus

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I watched this very cool vid, and noticed that the props looking arkward after the engine start. It spins up, and a split second later it turns to a smaller cirlce of blur. Is it normal? At the cocpit view iof the Hurricane it' barley visible too. In the sturmo' 46 i dind't noticed such thing. Is maybe the sup!d epilleptic senslessness behind this also? I read that this should be with a patch optional...