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Article selected from thousand boat trials performed by Nautica in nearly 50 years

Navigation trials

Please remember that the boat model described in this article could be no more available and its price, if indicated, could be outdated as it refers to the Nautica Magazine paper issue

For possible updated information on the model tested in this article and on all other models builded by this shipyard please search our YACHTING CATALOGUE

Text and photographs by Fabio Petrone


The sea trials of the cabin cruiser Proteo 28' were carried out near Civitavecchia on a day with moderate sea. Even though the sea conditions did not allow a full speed test, the seakeeping capabilities and the boat's ability of maintaining the right course were fully evaluated. Overall, the new cabin cruiser of the Ondablu yard is an excellent and comfortable boat. Notwithstanding her overall length of 28'11", on deck and belowdecks the layout is excellent.

The boat's cockpit is of adequate size and it is fitted with retractable settees, moving table and access door to aft platform. Sides are quite low so as to facilitate fishing. The gunwale may be fitted with rotating and fixed rod holders, boulter winch, etc. Bow area is easily accessible and it is fitted with a sunning area for two. Interior layout includes ample forward cabin with V-berth convertible in a king size bed. Amidships, to starboard there is the bathroom, opposite there is the fully fitted galley.

Aft there is the salon which includes the chart table to starboard and three settees, two of which are opposite and symmetrical and are convertible in two berths.


Designer: Ondablu
Yard: Ondablu Costruzioni Nautiche di Lorenzini & C.; via Aurelia Sud, 64/b; 57018 Vada (Leghorn, Italy); tel./fax +39-586-787490
Italian VAT: 20%
Gross tonnage: 6.7 t
LOA: 28'11"
Beam: 8'10"
Depth: 5'2"
Draft from lower tip of propellers: 2'3"
Light displacement: 9,492 lbs.
Maximum passengers capacity: 8
Test boat power: 2x165 hp VM MD 704LI
Total installed power: 330 hp
Total engines weight: 1,435 lbs.
Maximum declared speed: 32 knots
Declared fuel consumption at cruising speed: 10 gallons/hr
Fuel capacity: 2x53 gallons
Freshwater capacity: 32 gallons
Road transportation: yes
Launching and haulage: with lifting device
Price with standard equipment and test boat power: Lit. 161,000,000 ex VAT.


Wind: 10-15 knots
Sea: force 3-4

Time needed to reach planing speed: 4 seconds
Crash stop time: 5 seconds
Maximum speed at 3,800 rpm's: 26.4 knots
Cruising speed at 3,200 rpm's: 23.2 knots


Construction material and characteristics: hand stratified GRP with transverses and longitudinal frames
Lockers: 3 lockers in the cockpit, several lockers belowdecks, lockers under the forward V-berth
Helm station: the helm station is located in the salon to starboard, with a retractable settee, power steering, compass, horn, log, hour-meter, engine instruments and indicators, electrical panel


Layout and characteristics: salon with 2 opposite settees convertible in 2 berths and a third settee at the helm station. The bathroom is forward to port, with marine toilet, sink, mirror, 12V socket. Opposite there is the open galley with range, sink and refrigerator. Forward there is the V berth convertible in a very comfortable double bed
Cockpit and deck fittings: stainless steel bow arrangement and pulpit, stainless steel fittings, glass windows, rod-holders in the cockpit, aft platform with access door from the cockpit.