Our 90/90 has a large 2 blade prop that works fine.
It was a custom from Michigan as 2 blades are usually cast with fine blades , not the wider heavier blades usually found on a power boat style prop.
Took 9 months to have it special ordered!
With a prop lock the blade was indexed to no drag at 6K , and the start key is stowed on the lock release , just in case.
6.5K LRC is 3/4 GPH from an antique Volvo MD 3B, about 13 hp .
The engine is oversized as the large eutetic cold plates can add about 10HP to the load for 30 min with a warm box .
Frozen hard ice cream for 3 days , on the 4th the temp will start to climb from 5 F
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