The laminar-turbulent transition on a hydrofoil is investigated using a spectral element, incompressible code. A SD7003 foil section was chosen to compare with experimental measurements for validation of the overall characteristics of the Laminar Separation Bubble (LSB). The Reynolds number is increased from a fully laminar case (Re=5,000), to a partially transitional case (Re=20,000) and up to a fully transitionnal case (Re=60,000). The physical mechanism that leads to transition is investigated, and the hydrofoil characteristics are then analyzed through the evolutions of the lift and drag coefficients. The aim of this work is to get a better knowledge on the prediction of laminar separation induced transition for model testing of hydrofoil and propeller geometries.