Aluminum Bow Thruster Tunnels

Aluminum Bow Thruster Tunnels

For Bow Thrusters

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Tunnel Selection -
The diameter of the tunnel will be determined by the model of bow thruster and its propeller diameter. Tunnel diameter refers to the internal diameter of the tube.

The optimal tunnel length is between 2 and 4 times the tunnel diameter (measuring on the short [lower] side of the installed tunnel).
Tunnels which are too short allow the propeller to cavitate — which decreases performance and makes a lot of noise.
Tunnels which are too long have higher internal friction which reduces thrust. This becomes very noticable when the tunnel length exceeds 6 or 7 times the diameter of the tunnel.

Tunnel Installation Tips - The tunnel should be placed as deep as possible so the propeller does not draw air from the surface - which will completely eliminate the thrust. Additionally, the deeper the prop, the greater the water pressure on the blades - which maximizes the efficiency of the propeller.
Generally the top of the tunnel should be a minimum of 1/2 x the tunnel diameter below the waterline. This is an absolute minimum and we recommend that it be at least 3/4 x tunnel diameter below the waterline. An even better distance would be 1 x tunnel diameter below the waterline.
Once you get the top of the tunnel 1 foot (30-35 cm) below the surface, other factors should be considered more important - for example, moving the thruster further forward to get better boat turning leverage.

Click here for an excellent, illustrated guide for selecting and installing bow thruster tunnels. This guide also includes many worthwhile installation tips for optimizing your (expensive) bow thruster's performance.
Click on See detailed table of all productsto see specifications of product options.
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Sku#Item IDSide-Power#AvailabilityDescriptionUOMYour PriceQTY
432190SIP SM5012 SM5012Loading...Aluminum Bow Thruster Tunnel - 4.92" ID x 39.37" x 0.0197" Wall (125 x 1000 x 5mm)Loading...
451429SIP SM5017 SM5017Loading...Aluminum Bow Thruster Tunnel - 4.92" ID x 59.06" x 0.0197" Wall (125 x 1500 x 5 mm)Loading...
443269SIP SM8012 SM8012Loading...Side-Power Aluminum Bow Thruster TunnelsLoading...
212660SIP SM8017 SM8017Loading...Aluminum Bow Thruster Tunnel - 7.48" ID x 59.06" x 0.0197" Wall (190 x 1500 x 5 mm)Loading...
446827SIP SM12013 SM12013Loading...Aluminum Bow Thruster Tunnel - 8.66" ID x 39.37" x 0.394" Wall (220 x 1000 x 10 mm)Loading...
452147SIP SM12017 SM12017Loading...Aluminum Bow Thruster Tunnel - 8.66" ID x 59.06" x 0.394" Wall (220 x 1500 x 10 mm)Loading...
447011SIP SM10012 SM10012Loading...Aluminum Bow Thruster Tunnel - 9.84" ID x 39.37" x 0.276" Wall (250 x 1000 x 7 mm)Loading...
447012SIP SM10017 SM10017Loading...Aluminum Bow Thruster Tunnel - 9.84" ID x 59.06" x 0.276" Wall (250 x 1500 x 7 mm)Loading...
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