Hull and Design Philosophy
A traditionally styled modern gaffer is how the boating press characterised the 21 on its launch, and the description is precise. Cornish Crabbers built the boat on the same principles that made the 19 a three-decade success story: modern glass-reinforced construction with quality layup and structural fittings engineered to exceed their working loads, but wrapped in a hull profile that belongs to the working-boat heritage of Cornwall's rivers and estuaries.
The dimensions require some reading between the lines. The beam is carried further aft and the bow is more plumb than on the 19, meaning that the modest increase of twenty centimetres of beam and sixty centimetres of hull length dramatically understates the actual gain in usable volume. The lifting centreboard gives a draught of under sixty centimetres with the board raised, which opens up tidal creeks, drying harbours, and shallow anchorages that fin-keeled boats of any comparable size simply cannot reach.
Rig and Handling
The gaff rig is the defining characteristic of any Shrimper, and the 21 carries it well. Cornish Crabbers has refined the stepping procedure over decades, using the pivoting bowsprit as a lever to raise the mast single-handed — a practical detail that makes launching from a trailer a manageable solo task. Loads in the lines are low and excess cordage has been all but eliminated compared with a traditional gaff arrangement of fifty years ago, so the rig is approachable for sailors who have never handled a gaff before.
A meaningful advance over the smaller models is the rudder design. The 21's transom-hung rudder with its stainless steel lifting drop plate incorporates a balance area, which measurably reduces helm loads when the boat is pressed. The long waterline length, a consequence of the plumb bow, pays dividends under sail: reaching speeds of six knots can be reliably achieved in moderate breezes. That is not racing performance, but it is honest passage-making pace for a pocket cruiser.
Accommodation and Below-Decks Living
This is where the 21 most clearly justifies its existence as a distinct model. Two settee/quarter berths, a table that doubles as extra galley worktop space, and a more separate forecabin with an option for either a chemical or sea toilet make the 21 a genuine weekend boat rather than merely an overnighter. Generous sitting headroom is maintained throughout, and the centreboard case, while present, does not intrude significantly on legroom.
The cockpit has been reconfigured to offer far more usable seating on a single level, making civilised daysailing with a larger party practical. Every boat is built to order, so the interior layout, hull colour, and even teak inlays on the cockpit seats can be specified to the owner's preferences. An Adventure variant substitutes a taller Bermudan rig for the gaff, suited to owners who want fractionally better light-air performance while keeping the same hull.
Power Options
Cornish Crabbers offers the 21 with a choice of auxiliary arrangements suited to different use cases. An inboard Yanmar 1GM diesel with controls led to the cockpit is the traditional choice for coastal work. Outboard options — six or eight horsepower — mount in a dedicated well at the stern, keeping the cockpit uncluttered. Increasingly, the yard has begun fitting electric inboard and outboard motors, which the manufacturer describes as particularly well suited to estuary, Broads, and river-based home ports where emissions and noise matter.
Compromises and Practical Limits
The 21 does not pretend to be something it is not. Standing headroom is not available in a hull of this size without destroying the proportions and sailing qualities that define the design, and a genuinely separate heads compartment is similarly impossible. These are deliberate trade-offs, not oversights. The towing weight — heavier than the 19 — narrows the range of vehicles capable of towing it, a practical consideration for buyers planning to trail the boat regularly.
Open-sea passages are possible in settled conditions, but RCD Category C certification makes the boat's intended environment clear: sheltered waters, estuaries, and coastal cruising in good weather represent the design envelope. The Baltic, the Friesian Islands, Western Scotland, and the south of France have all been cited as reachable destinations with appropriate planning and weather windows, but the 21 is fundamentally a coastal and estuary boat that happens to be capable of modest offshore passages when conditions allow.
The Verdict
The Cornish Shrimper 21 is the rare boat that succeeds at being a modest improvement on something already excellent. It widens the audience for the Shrimper concept by adding weekend-viable accommodation and a cockpit large enough for a family or a group of friends, without sacrificing the shallow draught, easy trailing, and traditional character that built the brand's reputation over thirty years and more than eleven hundred boats.
Pros
- Lifting centreboard gives access to very shallow anchorages and drying berths
- Built to order with extensive colour and layout personalisation
- Simplified gaff rig with low line loads is easy to handle and solo-launchable
- Balance rudder reduces helm effort compared with earlier Shrimper models
- Genuine pocket cruising accommodation with two berths and a separate forecabin
- Choice of inboard diesel, outboard well, or electric propulsion
Cons
- No standing headroom — unavoidable in a hull of this size and character
- No fully separate toilet compartment
- Towing weight may exceed the capacity of smaller family cars
- Gaff rig, while authentic, is slightly more complex to learn than a simple bermudan
