About this tender
The Castoldi Jet Tender 34 is the largest model in the Castoldi range and the only one in the line built around a twin-engine, twin-waterjet driveline. At 10.5m and 2.80m beam, sixteen on the CE plate and 700 litres of fuel, it is the build we recommend when an owner wants the Castoldi character at full guest capacity, full speed, and full deck volume.
Twin 440hp diesels paired with two Castoldi Turbodrive units deliver 43 to 50 knots depending on configuration. The S version, with the larger Turbodrive 284 H.C.T. units, is the performance specification. The standard variant runs Turbodrive 240 H.C.T. units, simpler service and slightly lower top end. Either way, it is a serious platform for a 90-120m superyacht programme, with a hardtop convertible roof on most builds and joystick docking as part of the package.
Highlights
The four details we'd point out first to a captain who hasn't seen one on the water yet.
Two 440hp diesels driving two Castoldi waterjets. The S configuration uses Turbodrive 284 H.C.T. units for the higher top end, the standard variant runs Turbodrive 240 H.C.T. The redundancy of twin-engine running is a real factor on long shore transfers.
Castoldi quote 43 knots light loaded on the standard JT34 and 50 knots on the S version, dropping to 38 and 45 knots respectively at full passenger and stores load. That sits the JT34 at the upper edge of what we would call a tender, edging into chase-boat territory in the S configuration.
Most builds spec the retractable watertight soft-top hardtop, which keeps stowed height down for garage stowage and gives weather protection on long runs. Joystick piloting comes through the Castoldi twin-jet steering controller, a real benefit when a captain is putting a sixteen-guest boat against the swim step single-handed.
CE Cat C plate for sixteen passengers, with payload up to 1,650 kg standard or 1,900 kg on the S version. Dry weight runs 3,740 kg standard, 4,100 kg S, with full fluids in engine and waterjet. The bigger envelope is what makes a sixteen-guest day-boat layout work without crowding.
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 Castoldi 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
