Design Brief & Intent
The primary mission of the Whip 17 was pure speed and competitive racing, targeting sailors seeking a thrilling, physical experience on the water. Built during the height of the Molded Fiber Glass Boat Company’s expansion into the sailing market, the Whip 17 was designed to stand apart from the builder’s more conservative pocket cruisers like the Redhead 17 or utility day sailers like the Pintail. While competitor models of the era, such as the O'Day 17 or the Boston Whaler Harpoon 5.2, prioritized family-friendly stability, high freeboards, and heavy displacement, Macalpine-Downie crafted the Whip 17 with a low-profile, flat-bottomed hull shape optimized for immediate planing.
Constructed of solid, molded fiberglass, the boat’s wide cockpit is entirely open, devoid of heavy woodwork, cabins, or interior amenities. The design was purely structural and weight-sensitive. It was built as a pure racing dinghy, equipped with hiking straps and, in some cases, rigged with a trapeze to allow the crew to leverage their body weight against the massive rig. The build quality of the deck and hull relied on Molded Fiber Glass's industry-leading expertise in composite molding—the same company that famously manufactured the original fiberglass bodies for the Chevrolet Corvette. This industrial heritage resulted in a rigid yet remarkably light fiberglass structure.
Sailing Performance & Handling
Under sail, the Whip 17 is nothing short of a thoroughbred. The technical performance indicators reveal a vessel designed to fly. Its displacement-to-waterline-length ratio of 29.53 is exceptionally low, representing an ultra-lightweight, easily driven hull that transitions into a plane with minimal breeze. This planing capability is supercharged by a stratospheric sail-area-to-displacement ratio of 62.62. Powered by a fractional sloop rig hosting a 185-square-foot standard sail plan on a 27-foot-6-inch mast, the boat is incredibly fast. When paired with an optional reacher or gennaker, the sail area swells to 235 square feet, turning the featherweight 325-pound hull into a rocket ship downwind.
The handling characteristics require constant attention and a skilled hand. With a capsize ratio of 3.39, the hull is inherently tender and has zero self-righting capability. If the wind overpowers the crew's physical hiking efforts, the boat will capsize quickly. Its comfort ratio of 2.82 is predictably low, indicating that the boat behaves like a true sports car—firm, lively, and highly sensitive to wave action. The crew will experience a wet, exhilarating ride, skimming on top of the water rather than cutting through it. The centerboard design allows the draft to be adjusted from a mere seven inches with the board up—making it easy to launch from a trailer or beach—to a deep four feet seven inches when fully extended, providing excellent pointing ability and lift when climbing to windward.
Known Issues & Triage
Decades after leaving the factory, surviving Whip 17s present a few consistent, age-related structural vulnerabilities that buyers and restorers must triage. The most common structural failure involves the forward deck and mast partner area. Because the high-tension fractional rig exerts massive downward compression on the mast step, the deck can sag or crack over time. Underneath the deck's fiberglass skin, the factory utilized a plywood core backing plate. This plywood frequently rots due to water intrusion through unsealed mast step screws or the forward deck hatch. Restorers must inspect the underside of the deck and often need to install a heavy-duty vertical support post or compression strut between the keel and the mast socket to halt sagging.
The moving parts of the centerboard system are another primary area of concern. The heavy, unballasted centerboard pivots on a stainless steel pin and bushing housed inside the centerboard trunk. Over time, this pin can bend or shear, and the surrounding fiberglass holes in the trunk can wear out or develop cracks, leading to minor leaks. Fixing this requires boring out the worn pivot holes, reinforcing them with epoxy and fiberglass, and fabricating a new pin out of a high-strength stainless steel bolt. Furthermore, the rubber gasket at the mouth of the centerboard trunk often perishes with age. When the gasket fails, water can violently surge up and pour out of the top of the trunk during high-speed planing. Owners have successfully solved this by crafting custom wooden or rubber top-caps that seal the upper trunk opening while still allowing the centerboard line to operate.
Modernization & Upgrades
Modern owners of the Whip 17 focus their upgrade efforts on simplifying the boat’s high-performance rigging and enhancing structural longevity. Many sailors choose to remove the original, complex trapeze wires to make the boat more manageable for casual day sailing, replacing them with modern, high-comfort hiking straps. Converting the running rigging to high-tech, low-stretch ropes like Dyneema greatly improves control-line responsiveness, which is essential given how quickly the boat reacts to gusts.
To address the common deck flexing issues, veteran owners frequently execute localized recoring projects on the forward deck, replacing the rotted plywood cores with high-density foam or marine-grade mahogany plywood encapsulated in modern epoxy resin. The centerboard trunk can also be modernized by installing custom UHMW (Ultra-High-Molecular-Weight) polyethylene spacers inside the pivot assembly. This modification reduces friction, eliminates lateral play in the centerboard, and prevents the board from rattling or causing wear against the interior of the fiberglass trunk.
Market Snapshot & Economics
With only about 120 units ever constructed, finding a Whip 17 on the brokerage market today is exceedingly rare. They do not trade like mass-production pocket cruisers or standard laser dinghies; instead, they exist in a niche collector's sphere. The boat commands a modest premium among vintage dinghy enthusiasts who appreciate the pedigree of a Macalpine-Downie design and the unique history of the SailMFG brand.
Because of the boat’s simple fiberglass construction and lack of complex onboard systems, auxiliary engines, or plumbing, the economics of a restoration are highly favorable. A neglected hull can often be acquired for a very low entry price, and even a complete structural and cosmetic refit—including a new set of sails, fresh standing rigging, and trailer repairs—remains highly affordable compared to keelboat projects. For the active sailor, the Whip 17 offers an unmatched performance-to-cost ratio, delivering modern skiff-like sailing speeds for a fraction of the cost of a contemporary high-performance dinghy.
The Verdict
The Whip 17 is a rare, thrilling, and unapologetically fast vintage racing dinghy that represents the high-water mark of mid-1970s performance design. Under the pen of J. Rodney Macalpine-Downie, this featherweight flyer delivers blistering speed and immediate planing capability for those willing to work for it. It is not a boat for beginners, nor does it offer any concessions to comfort or casual cruising. However, for experienced sailors looking for a low-cost, high-adrenaline vintage racer with a fascinating history, the Whip 17 stands as an exceptional and rewarding classic.
Pros
- Stratospheric sail-area-to-displacement ratio delivers lightning-fast acceleration and early planing.
- Extremely shallow draft with the board up allows for effortless trailering and beach launching.
- Simple, lightweight construction makes it highly affordable to restore, maintain, and tow.
- Renowned Macalpine-Downie design pedigree offers a unique, collectable piece of sailing history.
Cons
- High capsizing risk due to a complete lack of ballast and a highly tender hull shape.
- Extremely rare on the secondhand market, making spare parts and donor hulls difficult to source.
- Forward deck is prone to sagging and rot under the compression of the mast step.
- Demands highly active crew work and physical hiking, offering a wet and exhausting ride in high winds.
