Make sure the stern tunnel does not interfere with the water flow under the hull.
• Make sure that, when installed, the thruster does not hinder the operation of existing equipment inside the boat.
• The motor must be supported in a manner that does not place the full weight on the tunnel.
• Make sure that the water flow from the thruster does not intercept the sterndrive engine, the flaps, etc., as any interference would considerably reduce the thrust.
• If necessary, it is possible to install the tunnel in a decentralized location
The motor unit is not waterproof; therefore, installa-tion compartment and motor must ALWAYS be kept dry. All drainage holes and/or possible water inlets must be sealed.
We recommend installing a bilge pump, preferably with an alarm system, in the stern propeller compartment.
| MODELS | BTQ 140 | BTQ/BTH 185 | BTQ/BTH 250 | BTQ/BTH 300 | BTAC/BTH 386 |
| Materials | BMC | BMC | BMC | GRP | GRP |
| Propulsion system | Single propeller | Double propeller | |||
| Ø Tunnel | 140 mm | 185 mm | 250 mm | 300 mm | 386 mm |
| A | 176 mm | 260 mm | 325 mm | 380 mm | 485 mm |
| B | 130 mm | 170 mm | 230 mm | 280 mm | 385 mm |
| C | 250 mm | 340 mm | 420 mm | 490 mm | 600 mm |
| D | 250 mm | 300 mm | 380 mm | 380 mm | 550 mm |
| E | 158 mm | 210 mm | 255 mm | 255 mm | 386 mm |
| F | 9 mm | 11 mm | 11 mm | 11 mm | 13 mm |
| G | 105 mm | 128 mm | 160 mm | 160 mm | 240 mm |
