Down-Angle and V-Drive Gearboxes
Gearboxes with an angled or reversed output that let the engine sit level, further aft, or further forward than a straight shaft line would allow.
Features
- A down-angle output lets the engine sit level in the hull while the shaft leaves at the required angle, which keeps the sump and the mounts in a sensible attitude.
- V-drive arrangements place the engine aft of the gearbox output, freeing cabin or cargo space forward.
- Output angle is a fixed property of the box and cannot be adjusted on installation, so it is confirmed against the hull drawing.
- Engine mounting height and the bed design follow from the box, which is why the two are chosen together.
- Access for oil changes and for the output coupling is worth checking on the drawing, because these arrangements are often tight.
Specifications
| Figure | Typical range | Unit | Why it matters |
|---|---|---|---|
| Output angle | 7 / 8 / 12 down | degrees | fixed at manufacture and has to suit the hull |
| Configuration | down-angle / V-drive | decides where the engine sits relative to the shaft | |
| Reduction ratio | 2.0 : 1 to 3.5 : 1 | matched to the propeller as with any box | |
| Rated input power at speed | 300 at 2 100 | kW at rpm | the rating that must cover the engine |