Tuning
Pump
2 articles on pump, covering 4 symptoms and linking 1 spec table. Basis, stated on each: 1 general principles, 1 cited to held documents.
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How a jet pump moves the craft
A stand-up moves by throwing water out of the back. It takes water in under the hull, speeds it up, and steers by aiming that jet, which is why it steers poorly with the throttle shut.
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What an impeller pitch number actually means
Pitch is the bite the impeller takes out of the water, and it is the single cheapest change to how a ski feels. It is also the one most often copied off somebody else's setup, where it does not transfer.
2 articles