Minimum prop clearance (tip to tip) on hexacopter?

Greetings,

I am working on a new setup for my current hexacopter and it requires going from 11" props to 13" props. I have worked out dimensions (in a 3D modelling program) that will be needed in order to extend the motors so the props will have clearance, as well as fit in my case.

The prop clearance would be ~5.2mm, any closer and I'm more and more afraid of interference/turbulence.

Is this okay? 

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