motor adjustment for altitude

[Anglinarcher]

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I have taken the information you gave and made some best guesses to fill in the gaps and I come up with the following props:
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Black Max 3 blade prop 13.75x15
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SpitFire 4 blade prop 13.4 x 15
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SpitFire X7 4 blade 13.5 x 15
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Vengeance 3 blade 13.375 x 14
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Total assumed boat weight with People and gear is 1739 pounds
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RPMs 5750
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Max boat speeds of 29.66 MPH at 7600 feet elevation.
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