The Glastron CVX 16, produced in the late 1970s as part of Glastron’s innovative V-hull runabout lineup, is often misunderstood as a high-speed performer akin to modern bass boats, but its design prioritized balanced handling over outright velocity. Stock configurations with the factory-optional 85-hp outboard (typically a Mercury or Johnson) achieved a verified top speed of around 32-35 mph under optimal conditions-light load, calm water, and a clean hull. This figure comes from period tests in boating magazines like Power Boat & Motor, which noted the boat’s 16-foot length and 6-foot beam limited hydrodynamic efficiency compared to longer hulls.
A common misconception is inflating speeds to 40+ mph by swapping to a larger engine, but this overlooks the CVX’s semi-V hull (20-degree deadrise), which generates more drag at high RPMs than a deep-V design. Real-world upgrades to 115 hp can push it to 38-42 mph, but expect reduced fuel efficiency (dropping to 4-5 mpg at WOT) and potential transom stress without reinforcements. For accurate benchmarks, factor in prop pitch: a 13-inch pitch aluminum prop yields better hole shot but caps top end, while a 15-inch stainless improves velocity at the cost of planing time.
Has anyone here repowered a CVX 16 with modern EFI outboards like a 90-hp Yamaha? I’d be interested in dyno-tested speeds and any hull modifications needed to avoid porpoising above 30 mph.