About this tender
The JT 18 is one of the higher-volume Castoldi sizes for owners on motoryachts in the 40m to 55m range. At 5.68m LOA and 2.44m beam, it is sized for the standard mid-to-large tender garage envelope and certified for nine guests under Cat C. Single Volvo Penta D3-170 diesel coupled to a Castoldi waterjet is the standard setup; this is one of two models in the range that uses the Volvo D3 over the Yanmar JH-series.
112 litre fuel tank, hard-chine deep-V monohedric hull with 20-degree deadrise, and 0.45m Hypalon tubes (5 separate compartments) make up the working specification. The boat is built to the same Italian factory standard as the rest of the line, with consistent finish and parts integration. We see the JT 18 specified more than any other size in the upper-mid range, alongside the JT 19.
Highlights
The four details we'd point out first to a captain who hasn't seen one on the water yet.
The 170 mhp Volvo D3 at 4,000 rpm is the reason this boat behaves differently from the Yanmar-powered models in the smaller end of the range. Volvo's parts and service network is global, and the D3 is one of the most widely-fitted small marine diesels. Service intervals and life expectancy are well-documented.
5.68m LOA and 2.44m beam matches the standard tender envelope on most 40m to 55m motoryachts. For owners stepping up the tender size on a refit or new build, this is often the right answer. Worth confirming weight and rigging point geometry against the mothership's lift specification.
Nine-passenger Cat C certification, supported by a deck layout that genuinely works for the count. For larger guest groups the JT 19 adds one to ten, or the JT 21 carries twelve; for smaller groups the JT 16 or 17 is more economical. The 18 is the right size for most working tender programmes.
Hand-laid Kevlar and vinylester fire-retardant resin hull, sandwich-construction deck and console, fire-retardant resin throughout. Built in Castoldi's factory near Milan. The build standard and fire-retardant specification are part of why these boats are accepted by yacht insurers and class societies without issue.
Gallery
The full specification
Specifications, prices, availability, and performance figures are supplied for guidance only and remain subject to confirmation by the yard, seller, broker, survey, contract, and final specification.
Questions, answered
Last call · Available
Castoldi · Albairate, Italy
Tell us about your yacht, your programme, and the missions 18 needs to handle. We come back within 48 hours with a written assessment - fit for the brief, lead time, and trade-offs against alternatives in the same band.
Prefer to talk? +44 (0) 77180 88055 · other ways to reach us
From the library
