minimum 0,75
times tunnel Ø
BARYCENTRE
L 1
L 2
A B
INSTALLATION REQUISITES
THE TUNNEL
• 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.
SINGOL PROPELLER DOUBLE PROPELLER
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