Data Tech Models 100% Avante Saildrive folding reversa & Shaft Power range 100% free c. galv. hidrol. Noot: The calculated propeller is the suggested propeller for your sailboat and engine installation. Our suggestions are based on propeller calculations using up to date computer software combined with our long time experience suggesting propellers for sailboats. Though every attempt has been made to guarantee the accuracy of the information and propeller calculation, we refuse to accept any responsibility for errors or omissions. The only way to ensure a correct propeller match for your sailboat and engine is to make a seatrial. On very rare occasions, if we have suggested a propeller that does not match the boat and engine information provided, then we will exchange or modify the propeller, but we don't cover any other costs except our own parts.