About this tender
The JT 28 is the second largest in Castoldi's modern jet tender range and the size most often specified by owners on motoryachts above 70m where deck or garage envelopes allow it. At 8.6m LOA and 3.0m beam, the boat carries sixteen guests at coastal certification with the deck volume and freeboard to back the count up properly. Single waterjet driveline keeps the engineering simple; the Castoldi Turbodrive 284 H.C.T. is the matched waterjet for this hull weight class.
210 litre fuel tank, 2,480 kg empty weight (with fluids and oils) and 1,750 kg payload capacity define the working envelope. Top speed is 38 knots light, 35 knots fully loaded; the same headline figures as the smaller JT 25 because the driveline is matched to maintain working performance with the larger hull. Build standard is identical to the rest of the Castoldi line, with the additional structural margin appropriate to the size.
Highlights
The four details we'd point out first to a captain who hasn't seen one on the water yet.
The Turbodrive 284 H.C.T. is the higher-capacity Castoldi waterjet sized for the JT 28's hull weight and design speed. Hydraulic clutch, movable grid for instant reverse, and Clear-Duct unclogging system to handle weed and debris in busy anchorages. At 38 knots top speed with sixteen passengers, the boat is set up for genuine working tender duty rather than just speed.
Cat C certification supports sixteen passengers, and at 8.6m LOA and 3m beam the deck genuinely works for the count. This is where the Castoldi range starts to compete with proper day boats for working capacity. For yachts running regular charter or large family programmes, the JT 28 reduces shuttle frequency meaningfully versus the smaller models in the line.
The 1,750 kg payload figure combines guests, crew, fuel and stores, and is meaningful for working tender programmes. It supports water-toy stowage on deck for shore runs, or stretcher carriage for medical extraction. Empty weight of 2,480 kg with fluids fits standard 4-tonne lift specifications on most large motoryachts.
8.6m LOA and 3.0m beam matches the larger end of standard production tender garages on motoryachts above 70m. For yachts where the JT 25 is too small for the working programme but the JT 34 is too big for the lift, the 28 is often the right answer. Confirm against the lift specification and the GA before committing.
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 28 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
