Marine Glass built 160 examples between 1986 and 1988. Conceived as a cruiser-racer-weekender, the Spring 25 offers responsive sailing and useful accommodation in a 25-footer, though early mast and chainplate problems deserve careful attention.
Design and Construction
Castro’s design measures 25ft 6in overall, with a 22ft 9in waterline. Displacement is 4,500 lbs, including 1,540 lbs of ballast. A 34.44 ballast-displacement ratio and 170.62 displacement-length ratio place her firmly in the light-displacement weekend camp, reflecting a lively coastal character rather than offshore ambition. One owner believes the boat was originally drawn for a young family.
MG yachts were lightly built. The Spring 25 draws just 3ft 0in on very shallow wing keels. This stubby piece of iron trades grip for access to sheltered water and will look after the boat.
The main concern in the structural record involves the mast. There were a few early incidents when masts were lost, variously blamed on extrusion faults, chainplates placed too closely together, and even flexing hulls. Early Spring 25s may need reinforcement beneath the mast foot. Owners have also recorded a well-known fault involving a chainplate pulling out, so any survey should address that area directly.
Rig and Handling
Under sail, the Spring 25 is handy and responsive at the helm without feeling twitchy. She can be bouncy in a wave set but isn’t flighty, and she’s stiff enough to stand firm when hard on the wind. At a moderate angle of heel, the shallow leeward rudder blade remains plumb vertical while the windward blade clears the water, preventing interference.
That twin-rudder arrangement is one of the design’s defining features. Owners who race the boat describe her as fun, fast downwind, and not slow to windward. With a number three jib, she’ll go to windward quite happily in a blow, and she isn’t bad in really light winds either.
Her main vice appears when she stalls in light air. If the boat loses way, she goes sideways until speed builds again because the shallow keel has little grip when stopped. There’s a similar dead spot under power: the prop wash passes between the two rudders, so the helmsman can’t steer until the boat begins moving.
The original double-mainsheet system freed cockpit space by avoiding the “paper guillotine” effect of a traveller beside the companionway. However, the sheeting angles to the two off-centreline points were awkward and required a convoluted gybe-preventer arrangement.
Accommodation
Below, the Spring 25 punches above her length for short stays. MG Yachts claimed six berths in two cabins, while owners confirm that she sleeps four very easily. The saloon settee berths are suitable for adults, and the forepeak is large enough for two youngsters. Its lip lifts to provide more footroom and lengthen the berth. The saloon table lowers on the mast-support post to create a double.
A large double cabin occupies the port quarter. To starboard aft are commodious heads and a wet locker; the rest of that quarter is taken up by a single deep cockpit locker containing the engine-start panel.
For a boat of this size, the two-burner galley and forward-facing chart table are admirable. She also carries a cool box. Storage is limited for a long cruise, but owners describe the boat as a brilliant weekender.
Engine and Owner-Finished Interiors
The auxiliary is a single Yanmar diesel driving a two-bladed folding propeller on a P-bracket. The installation includes a single 12V battery and a single-lever engine control in the cockpit.
The Spring 25 was originally sold with a Trim Pack containing pre-varnished doors, fiddles, lockers, and fittings for owners to install. Owners installed these components to finish the interior, which explains the variation in interior presentation among surviving boats.
Known Issues
The early mast and chainplate faults are the main structural concerns. Early hulls may have weakness beneath the mast foot, and any evidence of chainplate movement warrants attention.
The steering dead spot under power is a genuine handling quirk rather than a defect, but buyers and users should respect it. Likewise, the shallow wing keel’s lack of grip when the boat is stopped is inherent in the layout.
Testers are clear that the Spring 25 isn’t recommended for beginners and definitely isn’t intended for extended offshore work. She’s a Solent-weekend and club-racing boat.
The Verdict
The Spring 25 is a characterful, light-displacement Castro design. She rewards an engaged owner with lively performance and a surprisingly roomy weekender interior, but early mast and chainplate fragilities, along with the low-speed steering dead zone, count against her. She’s best suited to sheltered-water families and racers who understand and accept those limits.
Pros
- Handy, responsive helm
- Twin rudders that clear cleanly when the boat heels
- Fast downwind and competent to windward with a number three jib
- Roomy weekender layout with a double cabin, forward-facing chart table, and six-berth potential
- Shallow wing keel for easy access and sheltered-water draft
Cons
- Early mast losses and chainplate pull-out faults require reinforcement checks
- Twin-rudder layout provides no steering under power until the boat gathers way
- Little keel grip when stopped, allowing the boat to slip sideways if stalled in light air
- Not recommended for beginners or extended offshore use
