Aeromarine Triton — Information, Review, Specs

Carl Alberg·1960·Aeromarine Plastics
Approximate drawing

Hover a measurement to read its value

Hull type
Monohull · full
Rig
Masthead Sloop
LOA
28.33' · 8.63 m
Displ.
7,100 lbs · 3,221 kg
First year
1960

The Aeromarine Triton, more specifically known in multihull circles as the Triton 24 or T24, represents a pivotal moment in the evolution of production multihulls. Designed by the legendary Derek Kelsall and manufactured by Aeromarine Ltd. in Emsworth, UK, this 24foot trimaran was a pioneer in the application of foamsandwich construction techniques to the recreational market. While the "Triton" name is often associated with the ubiquitous Pearson monohull, the Aeromarine version is a distinct, highperformance craft designed for speed, shallowwater exploration, and coastal racing. Its development in the late 1960s and early 1970s helped establish the viability of the "demountable" trimaran concept, allowing owners to disassemble the vessel for road transport or seasonal storage, a feature that paved the way for modern folding trimaran designs.

Measurements

Dimensions 01

Length overall
28.33 ft
Length on deck
Waterline length
21.58 ft
Beam
8.25 ft
Draft
3.92 ft
Maximum headroom
Air draft

Construction & hull 02

Construction
Fiberglass
Hull type
Monohull
Keel type
Full
Rudder
1× Attached
Ballast
Displacement
7,100 lbs
Water capacity
Fuel capacity

Rig & sails 03

Rig type
Masthead Sloop
Mainsail luff
31.5 ft
Mainsail foot
13.5 ft
Foretriangle height
36 ft
Foretriangle base
9.9 ft
Forestay length (estimated)
37.34 ft
Sail area
391 sqft

Calculations 04

Sail area to displacement ratio
16.93
Ballast to displacement ratio
Displacement to length ratio
315.4
Comfort ratio
27.95
Capsize screening formula
1.72
Hull speed
6.22 kn

Sailing Performance & Handling

The Aeromarine Triton 24 is defined by its lightness and its ability to outpace significantly larger monohulls, particularly in off-the-wind conditions. Built using early GRP foam-sandwich methods, the hull is inherently stiff and buoyant. According to historical design archives at Kelsall Design, Derek Kelsall’s focus on weight reduction allowed the Triton to achieve a high sail area-to-displacement ratio, ensuring that it remains responsive even in light airs.

On the water, the Triton 24 exhibits the characteristic "flat" sailing of a trimaran, rarely exceeding 10 to 15 degrees of heel before the outriggers (amas) provide maximum righting moment. Handling is reported to be nimble, though, like many early multihulls, it requires active sail trimming to prevent the main hull from burying its bow in heavy gusts. While it does not point as high as a deep-keeled racing monohull, its ability to "plane" on its main hull allows it to reach speeds into the mid-teens under the right conditions. Tracking is generally reliable thanks to a central daggerboard, which can be raised for beaching or navigating shoals, a hallmark of the Kelsall design philosophy.

Interior Comfort & Variations

The interior of the Triton 24 is unapologetically Spartan, reflecting its primary mission as a fast coastal cruiser and racer. The main hull houses a compact cabin that typically features a V-berth forward and two short settee berths in the main saloon area. Headroom is restricted, usually necessitating a seated or "hunched" posture for most adults, which is common for trimarans of this era where aerodynamic drag and weight are minimized.

While the "standard" Triton 24 was the most common production model, Kelsall’s design versatility led to several siblings and variants. The T24 hull platform was occasionally modified into the Triton 25, which featured slightly extended transoms for better buoyancy aft. Additionally, some custom variants were built with a more pronounced "doghouse" or raised cabin top to provide a marginal increase in standing room, though these are rare on the second-hand market. The materials used inside are primarily functional fiberglass moldings with minimal wood trim to keep weight low.

Known Issues & Buyer’s Checklist

Prospective buyers of an Aeromarine Triton should focus their inspection on the integrity of the sandwich construction and the mechanical connections of the beams.

  • Core Delamination: As a pioneer in foam-sandwich construction, early Tritons may suffer from delamination if water has compromised the bond between the fiberglass skins and the foam core. This is particularly common around deck hardware and the waterline.
  • Beam Attachment Points: The Triton 24 is a "demountable" trimaran rather than a "folding" one. The points where the crossbeams (akas) bolt into the main hull and the outriggers are high-stress areas. Inspect for stress cracking, crazing, or signs of structural repair in the laminate surrounding these bolt holes.
  • Daggerboard Trunk: The trunk and the board itself are prone to wear and impact damage. Check for leaks at the base of the trunk and ensure the board has not become swollen, which can lead to it jamming.
  • Ama Buoyancy: Older outriggers can accumulate water if there are hairline cracks in the deck-to-hull joints or around the beam sockets. Ensure the amas are dry and the internal bulkheads remain securely bonded.

Community & Resources

The primary resource for technical data and historical context for the Triton 24 is the designer himself. Kelsall Design maintains an active presence and provides insights into the early foam-sandwich methods used by Aeromarine. While there is no longer a dedicated "Triton-only" class association, the model is frequently discussed within the broader Multihull Offshore Cruising & Racing Association (MOCRA) and various Kelsall-specific builder groups.

The Verdict

The Aeromarine Triton 24 is a vintage speedster that offers a low-cost entry point into the world of performance multihulls. While it lacks the amenities of a modern cruising catamaran, its historical significance and exhilarating handling make it a cult favorite for sailors who prioritize pace and shallow-water access.

Pros:

  • Exceptional speed and light-air performance for its size.
  • Shallow draft with a retractable daggerboard, perfect for beaching.
  • Demountable design allows for easier transport and off-season storage.
  • Strong historical pedigree from a world-renowned designer.

Cons:

  • Extremely limited interior volume and headroom.
  • Susceptibility to core delamination in older, poorly maintained hulls.
  • Requires more active management and "high-strung" sailing than a monohull.
  • Demounting for transport is a labor-intensive process compared to modern folding systems.

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