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Drilling holes is the critical step. You do NOT want to use lag screws in the bottom two holes, rather use the slots.

There is a diagram showing the right layout. Measure 3x, drill 1x. Read all the contents
http://www.whalercentral.com/articles...icle_id=82

You don't need a foil or a 4 bladed prop.

With a decent stainless prop, mounted high, you can expect 32-34mph running solo and light.