17
INSTALLATION
GB
BOW THRUSTER BTQ250 - BTQ300 IT GB - REV002A
• 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.
• An increase in the length of the tunnel increases 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.
BARYCENTRE
L 1
L 2
AB
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