Invader 22 Information, Review, Specs

Sailing Performance & Handling

Under sail, the Invader 22 is best described as a predictable and forgiving vessel, ideal for novice sailors or those transitioning from dinghies to cruisers. The majority of these hulls were produced with twin (bilge) keels, a design choice necessitated by the shallow, muddy creeks of the Thames Estuary and the requirement to stand upright on a drying mooring. While this configuration increases wetted surface area and limits pointing ability compared to a fin-keel equivalent, it provides a stiff, upright ride that instills confidence in heavy weather.

The masthead sloop rig is simple and robust. With a relatively high ballast-to-displacement ratio, the boat carries its canvas well and does not require early reefing. Owners often note that while it is not a "greyhound" of the sea, the Invader 22 tracks remarkably well for its size, thanks in part to its generous skeg-mounted rudder. According to archival data from the Snapdragon Mirage and Invaders Association, the hull's displacement provides a level of sea-kindliness often missing in lighter, modern 22-footers, allowing it to punch through a typical coastal "chop" without losing significant momentum.

Interior Comfort & Variations

For a 22-foot vessel, the Invader's interior is an exercise in efficient space management. The layout typically features four berths: a V-berth in the forward cabin and two settee berths in the main saloon. The "doghouse" profile of the coachroof was a deliberate design choice by Thames Marine to maximize standing headroom in the galley and entrance area—a luxury rarely found in boats of this length.

The joinery is functional, utilizing a mix of GRP moldings and teak trim, reflecting the industrial efficiency of Thames Marine's production line. A small galley, usually equipped with a two-burner stove and a modest sink, is situated near the companionway for ventilation. Variations of the model exist, primarily regarding the auxiliary power; earlier versions often featured outboard motors on transom brackets, while later models were frequently fitted with small inboard diesels, such as the Petter or Yanmar 1GM series. The Invader 22 also shares significant DNA with its "sibling," the Invader 20, which utilized a shorter version of the same design philosophy but lacked the interior volume of the 22.

Known Issues & Buyer’s Checklist

Prospective buyers of an Invader 22 must approach the vessel with an understanding of 1970s GRP construction techniques. While the hulls are generally "overbuilt" by modern standards, they are not immune to the passage of time.

• Osmosis: Like many boats from the Thames Marine era, the Invader 22 is prone to osmotic blistering. While rarely structural in these thick laminates, it is a significant factor in valuation.
• Deck Core Compression: The decks are often cored with plywood or balsa. Owners should check for "soft spots" around the mast step and stanchion bases, where water ingress can rot the core and lead to structural flexing.
• Keel Bolts: On bilge-keel versions, the internal keel reinforcements and bolts should be inspected for signs of weeping or rust, especially if the boat has spent years on a drying mooring where the keels take the full weight of the hull twice a day.
• Window Leaks: The original aluminum-framed or rubber-gasket windows are a common source of leaks, often leading to damage in the interior woodwork below.

Community & Resources

The primary repository of technical knowledge and historical documentation for this model is the Snapdragon Mirage and Invaders Association (SMIA). This volunteer-run organization maintains a technical library of original brochures and provides a forum for owners to discuss restoration projects and spare parts sourcing, which is vital given that Thames Marine ceased operations in the early 1980s.

The Verdict

The Invader 22 is an honest, stout little cruiser that offers an accessible entry point into the world of yachting. It excels as a coastal explorer, particularly in regions where tidal harbors and shallow drafts are a way of life.

Pros:

• Excellent stability and predictable handling in coastal conditions.
• Capable of drying out on its own keels, saving on mooring costs.
• Surprising interior headroom and volume for a 22-foot boat.
• Strong community support through the SMIA.

Cons:

• Pointing ability and light-wind performance are limited by the bilge-keel design.
• Most examples require significant cosmetic or systems updates due to their age.
• Original inboard engines (if present) are likely nearing the end of their service life.