Yes, Griffon not Merlin with contrarotating props.
I think the main reason he was reluctant to open it up was more a matter of how secure the anchor was. That prop would not be able to absorb anything like the total output of the Merlin either. I am surprised that he is using a propeller not a paddle, which would not produce the thrust, although a fair breeze through the radiator would be needed if opened up to any extent.





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