Sleipner SE50 Tunnel Bow Thruster 12V
#2 in 45 to 75 kgfFull review
A mid-size bow thruster for a 26 to 36 ft boat. Buy the SE60 instead if you also want a stern thruster of the same family.
Amazon $1,700$1,700
The Sleipner SE50 Tunnel Bow Thruster 12V rates 3.9 among 45 to 75 kgf bow thrusters; the Sleipner SE40 Tunnel Thruster 12V rates 3.6 among under 45 kgf ones. The Sleipner SE40 Tunnel Thruster 12V costs $250 less ($1,450 vs $1,700).
Prices were last checked November 4, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Sleipner SE40 Tunnel Thruster 12V
#1 in Under 45 kgfFull review
A strong value pick for a 26 to 34 ft boat: about $36 per kgf from a compact unit. Check that your battery bank can feed 315 A.
Amazon $1,450$1,450
Scores side by side
These two sit in different thrust classes (45 to 75 kgf and under 45 kgf), and each is scored against the reference points for its own class, so a rating says how well each does among its own thrust peers. How we rank explains each factor.
| Factor weight | Sleipner SE50 Tunnel Bow Thruster 12V | Sleipner SE40 Tunnel Thruster 12V |
|---|---|---|
| Overall rating | 3.9/5 | 3.6/5 |
| Value 40% | 79 $34 per kgf ($1,700, 50 kgf) | 75 $36.25 per kgf ($1,450, 40 kgf) |
| Efficiency 25% | 98 20.8 kgf per kW (50 kgf, 2.4 kW) | 60 18.2 kgf per kW (40 kgf, 2.2 kW) |
| Run time 25% | 33 3 minutes continuous | 33 3 minutes continuous |
| Weight 10% | 44 3.3 kgf per kg (50 kgf, 15 kg) | 67 4 kgf per kg (40 kgf, 10 kg) |
Specifications
| Sleipner SE50 Tunnel Bow Thruster 12V | Sleipner SE40 Tunnel Thruster 12V | |
|---|---|---|
| Thrust | ||
| Rated thrust | 50 kgf | 40 kgf |
| Thrust at full supply voltage | 62 kgf | 48 kgf |
| Style | Tunnel | Tunnel |
| Propellers | Single | Single |
| Bow or stern use | No | Yes |
| Boat length | 26-36 ft | 26-34 ft |
| Electrical | ||
| Supply | 12 V | 12 V |
| Motor | 2.4 kW | 2.2 kW |
| Current draw | 370 A | 315 A |
| Continuous run | 3 min | 3 min |
| Build | ||
| Tunnel diameter | 140 mm | 125 mm |
| Weight | 15 kg (33.1 lb) | 10 kg (22.1 lb) |