Quick BTH 513 Installation And Use Manual page 23

4 - Installation requisites
4.1 - Installation requisites tunnel
• The rounded ends of the tunnel limit the creation of turbulences and cavitations, improving performance of the
propeller thrust and reducing noise levels to a minimum.
• The force produced by the flow of the water when the boat is moving produces resistance on the rear face of
the tunnel, which is an area exposed frontally to the water flow.
To limit this phenomenon, prepare an indentation in the rear part of the tunnel. Otherwise, create a deflector on
the front part of the tunnel.
• If the tunnel is near the waterline, it is advisable to fit a grating at the end of
the tube.
The grating must have as large a vertical mesh as possible to avoid contrasting
the propeller thrust. The vertical mesh prevents the entry of most of the floa-
ting objects.
INSTALLATION AND USE MANUAL BTH 513 - REV001A
BTH 513
EN
23