Jensen sailboats: two builders, one surname, no connection
"Jensen" in this catalog names two people, two companies, and two continents, joined by nothing but a shared surname. On one side is Jensen Marine, the California fiberglass builder Jack Jensen founded in 1956, whose boats were sold and are documented under the Cal name — the naming story belongs here, but the Cal range's own model-by-model history has its own page. On the other is E. Bjørn Jensen, a Svendborg, Denmark, ship engineer and naval architect whose Impala line is represented in this catalog by the Impala 28 and Impala 36. The two never worked together, never built in the same country, and share no history beyond the name on this page.
Origins and ownership
Jack Jensen started Jensen Marine in 1956, and it grew into one of the most successful fiberglass boat manufacturing companies in California. Its success accelerated once Jack Jensen began collaborating with designer Bill Lapworth. Lapworth's first design for the company was the Lapworth 24, soon renamed the California 24 and then shortened again to Cal 24 — the naming chain that explains why boats built by Jensen Marine carry the Cal badge rather than the Jensen name. Jensen Marine was sold to the Bangor Punta Corporation, whose ownership lasted approximately twenty years, from 1964 to 1984; GG Archives holds a collection of Jensen Marine/Cal advertising and marketing material from that period. A 1968 advertisement announced a new East Coast production plant, built to meet rising demand for the Cal 20, 25 and 28 east of the Mississippi without cross-country freight charges. Through the 1960s, 1970s and into the 1980s, Jensen Marine was a leading builder, with designs spanning 25-, 28-, 30-, 36-, 40- and 46-foot sizes, and the Cal name it built under remained a leading brand for about a quarter century despite being sold to Bangor Punta and later resold and relocated again.
E. Bjørn Jensen (1928-2007) was a Svendborg ship engineer and boat designer credited with putting both large and small vessels to sea. He lived in Svendborg from 1939, apprenticed at Svendborg Skibsværft in 1945, went to Helsingør to study to become a ship engineer, and returned to the shipyard in 1956; he became head of its ship design office in 1970. His career as a boat designer began in 1958, when he designed a boat for himself — built of water-resistant plywood, a material the Svendborg municipal archive credits him as the first designer to use. He created the Impala boats for more demanding sailors.
The designers
Design credit sits on opposite sides of this page. On the American side, Bill Lapworth was the designer behind Jensen Marine's rise, though the Cal range's own design history belongs to the Cal page, not this one. On the Danish side, sailing writer Jan Ebert, in Danske Lystbåde (vol. 2), wrote that as a designer Bjørn Jensen emphasized combining practical manageability with good sailing performance — a judgment reinforced by the 4.4-class sailing cutter Tulle, a 1973 racing and day boat (what would today be called a daysailer) that Bjørn Jensen designed and that is now held by Denmark's Museum for Pleasure Sailing. The museum states he is especially known for the popular Impala boats. About 50 examples of the 4.4-class were built, with a hard-chine hull and planking and deck of water-resistant plywood — the same construction method and hull form that defined his early Impalas.
Construction through the eras
The Impala line's hull form followed directly from its material. The first Impala was a 30-foot boat, initially built in plywood, and the series took a hard-chine form because that shape was necessary to work the plywood. When boatbuilder Henning Stenner, on the island of Tåsinge, began producing the Impala boats in fiberglass, the hard chine was retained to emphasize the boats' shape. A separate fiberglass boat from the same designer, the 4.4-class, followed a parallel but distinct path on the same island: boatbuilder Poul Tom Hansen and a fellow apprentice arranged with builder Poul Oddersborg that if they helped him build his wooden hull, they could take a mold off it to cast fiberglass hulls of their own. That mold was finished around 1967-68 and brought to Bjerreby, also on Tåsinge, where a small yard cast several hulls in fiberglass with a fiberglass-coated plywood deck. The two accounts describe different boats built on the same island in the same era, not competing claims about the same boat.
The line later diverged from its hard-chine origin: an Impala 33 and Impala 36 were also launched, and unlike the earlier hard-chine Impalas, the Impala 28 and Impala 36 — the two models in this catalog — are round-bilged. Quite a few Impalas were sold during the 1980s as self-build kits rather than as factory-finished boats.
Lines and generations
This catalog's four Jensen-labeled models split cleanly along the disambiguation above. The Cal 36 and Cal 28 are Jensen Marine's Cal-badged boats, reviewed on their own terms on the Cal make page rather than here. The Impala 28 and Impala 36 are Bjørn Jensen's round-bilged Impalas, the later generation of a line that began hard-chine and in plywood. A listing that simply says "Jensen" could be either family, and only the model name settles which one it is.
Who Jensen is for
A buyer drawn to this page by the name alone is really choosing between two unrelated boats. One path leads to an American fiberglass cruiser-racer designed by Bill Lapworth and built by a major California yard from the 1950s into the 1980s — best researched under the Cal name it was actually sold under. The other leads to a Danish design line from a Svendborg naval architect known for balancing manageable handling with genuine sailing performance, where the specific model settles whether the hull is hard-chine or round-bilged, and whether it left the works factory-built or as a self-build kit.