Installation - Quick BTQ125 Installation And Use Manual

4 - Installation

4.0 - Instructions for optimal tunnel installation
• The position of the tunnel will depend on the
interior and exterior shape of the boats bow.
• Optimal positioning of the tunnel will be in the
bow and as low as possible, at least 0.75 times
the tunnel diameter from the waterline
• To avoid cavitation in the propeller, the tunnel
must be positioned as low as possible.
• The lever effect in the boat is proportional to
the increase of the distance (L1 and L2) between
the barycentre and the position of the tunnel A
and B.
F
For greater lever effect prefer position B
to position A.
• An increase in the length of the tunnel increas-
es the effect of the loss of charge, decreasing
the nominal driving force.
• To limit losing charge, the optimal length is
equal to 3-4 times the tube diameter; a ratio of
up to 6 can be tolerated.
20
BTQ110-125 INSTALLATION AND USE MANUAL - IT EN - REV004A
BTQ110/125
MINIMUM 0,75
TIMES TUNNEL Ø
BARYCENTRE
L 1
L 2
EN
A B
B