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Thought I’d post info on my boat, motor and propeller test at high
altitude.

Boat 1974 Montuak

Engine 2021 F70 Yamaha mounted 2 holes up.

Yamaha 13 5/8 x 13 k aluminum propeller

Elevation 5800 feet, Lake Davis Ca

Boat load 6 gallons of fuel, myself at 235 pounds, tackle box and fish rods.

Calm wind, lake was glass.

GPS speed 31 MPH at 6300 rpm. This was with trimming motor out.

I hope this is helpful