Electric Boat Range Calculator: Speed, Battery and Solar
Wired White v2 Estimate electric boat range versus speed, size the battery and compare solar assistance. Includes displacement and planing models, a published test curve and map rings.
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Wired White v2 
Boat Speed, Prop Pitch, Horsepower and Fuel Cost Calculator
Wired White v2 Estimate hull speed, shaft horsepower, propeller slip and pitch, then calculate boat fuel burn and trip cost. Compare displacement, transition and planing methods.