EN
BTQ SERIES INSTALLATION AND USE MANUAL - IT EN - REV001A
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BTQ series5 - Installation
MINIMUM 0,75
TIMES TUNNEL Ø
BARYCENTRE
L 1
L 2
A
B
• 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.
• 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.
F
For greater lever effect prefer position B
to position A.
5.0 - Installation requisites
SINGLE PROPELLER
DOUBLE PROPELLER
The Tunnel
B
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