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I would suggest a generalised tip clearance of 1/6th of prop diameter, for both a tunnel and non-tunnel application. Also, I'd use the same ratio of clearance as a minimum from trailing edge of prop blades to leading edge of rudders.
I've seen successful installations with more and less clearance, but the above is a good starting point. Too little clearance is worse than too much usually.
Are you buying a prop / props off the shelf or purpose made ? Is this a tunnel application ?
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