Start from the constraint, not the wish
Almost every tender purchase goes wrong the same way: the buyer starts from what they want the tender to do, then discovers at the end that it does not fit the davits, the foredeck or the locker. Start from the constraint and work backwards.
Measure three things before you shop: the davit span and rating, the clear foredeck space with the anchor gear in place, and the largest locker opening the packed boat must pass through.
Rough sizing by parent vessel
| Parent vessel | Typical tender | Usual constraint |
|---|---|---|
| Under 30 ft monohull | 1.9–2.4 m packable | Locker and foredeck space |
| 30–38 ft monohull | 2.3–2.9 m packable or light RIB | Foredeck stowage, single-handed launching |
| 38–45 ft monohull | 2.6–3.1 m RIB or inflatable cat | Davit rating and ready-to-use weight |
| 45 ft+ monohull | 3.0–3.4 m RIB | Davit span, boarding height |
| Cruising catamaran 38–45 ft | 3.0–3.6 m RIB or cat | Davit span rather than weight |
| Motor yacht with garage | 3.0–5.0 m RIB or jet tender | Garage dimensions |
The 2.9 m rule
For cruising couples, roughly 2.9 m is where a tender becomes genuinely useful: it will plane with two adults and shopping, it tows straight and it is still liftable. Below about 2.6 m the boat starts refusing to plane with two people; above about 3.2 m the weight and stowage problems escalate faster than the usefulness does.
That is why the Highfield UL290 is the single most cross-shopped cruising tender in Australia. It sits exactly on that line.