About this tender
The Jet Tender 14 is the smallest of the modern Castoldi range, sized at 4.28m for compact tender garages on smaller motoryachts and sailing yachts. Diesel waterjet propulsion is the design choice that defines the boat: no submerged propeller, controlled beach approach, and the operational simplicity that comes with one engine and no exposed gearbox. We see it on yachts in the 28m to 40m range where garage geometry rules out anything larger.
Power is a single Yanmar 4JH3-DTE 125 hp marine diesel coupled to a Castoldi waterjet. Top speed is 34 knots; the Kevlar laminate hull and waterjet driveline make the boat genuinely fit for working tender duty including beach landings and low-water operation. The 4.28m length and 2m beam are tight for seven-passenger work, so plan crew load carefully against the certified guest count.
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Highlights
The four details we'd point out first to a captain who hasn't seen one on the water yet.
The 4JH3-DTE Yanmar at 125 hp at 3,800 rpm is matched to a Castoldi waterjet. Diesel safety, single-engine simplicity and waterjet shallow-water capability are the operational headlines. Service is on a standard Yanmar schedule and parts availability is global, which matters for a tender that may follow the mothership across multiple basins.
At 4.28m LOA and 2m beam the JT 14 fits into the smallest tender garages in the production market. For owners with a 28m to 35m yacht where the garage is dimensionally tight, the 14 is often the only credible diesel waterjet option. Build the fit-check around the lift and garage geometry before committing.
Hand-laid Kevlar and vinylester fire-retardant resin hull, sandwich-construction deck, and Hypalon Neoprene tubes. Castoldi build everything in-house at the factory near Milan, which is the engineering reason the JT range has held up well on the brokerage market. Build standards are at the high end of production tender segment.
Waterjet propulsion gives the JT 14 the ability to run in shallow water and approach beaches without prop damage. Combined with the Clear-Duct unclogging system, the boat can operate in weed-rich anchorages where outboard alternatives struggle. This is the reason the waterjet platform earns its premium over a comparable RIB-with-outboard alternative.
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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 14 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
