By Thomas P.

The beautiful color combinations, the very careful design of the deck and the quality of construction compose a remarkable set which testify to the experience of Italboats yard which has been manufacturing rigid inflatable boats for decades now and has introduced a lot of people in the magic world of the sea.

Stingher 30 GT

The key to success is the continuous redesign and adaptation of the deck and hull to modern requirements, always based on reliability, comfort and safety.
Stingher 30 GT is part of the Custom Edition series which offers over 20 combinations of colours and materials for the construction of the hull, tubes and upholstery with the primary purpose of creating an exclusive inflatable boat.

The Italboats yard, focusing more on a comfortable and functional deck and less in an offshore orientation, preferred to build Stingher 30 GT on a relatively shallow hull so as to provide the greatest possible comfort to the occupants when relaxing in an idyllic bay.

Its hull is characterized by the presence of three spray rails starting from the stem and ending up to the transom, with the exception of the lower one which stops at about the height of the helmseats.

The width of the spray rails increases gradually from the lowest to the highest, reaching a maximum of 9 cm at the area of the transom.

Stingher 30 GT

It is worth mentioning that the chine, which starts with a height of 12 cm in the bow area and gradually decreases to 9 cm in the stern area, forms a shallow tunnel with 25 cm of width on its lower surface, which plays a very important role both in the planing of the boat as well as during the ride, limiting the escape of water for maximum possible stability.

On deck

One of the strongest points of the deck is the beautifully designed console as well as the configuration of the bow sundeck which without any doubt is one of the most functional and spacious in its class.

Stingher 30 GT

The superstructure of the bow has benches to either side with respective storage areas beneath. Among them, on the floor of the deck, there is a large locker which houses the plastic water tank of the rib.
Further more we can see the large locker which with the corresponding addition that connects the two benches, forms a large sunbed measuring 1.90 meters of overall length and 1.73 meters of maximum width.
The pillows are 15 centimetres lower than the upper surface of the tubes, forming a very comfortable relaxing and sunbathing area.

Immediately after and a little higher than the bow sundeck pillows, there is the independent locker that hosts the windlass and the anchor chain. The anchor exits from the bow entrance immediately below the chine, leaving free the surface of the small fibreglass hard nose. However, it would be preferable for the cleat to be placed on its side surfaces rather than in the middle of the hard nose being a dangerous point when accessing the boat.

Stingher 30 GT

Stingher 30 GT

The console is very well designed and fits perfectly with the overall aesthetics of the rib. It is centrally positioned, leaving particularly large passageways to the port and starboard, reaching 48 cm of maximum width at their front part.
At the ends of its front surface there are long stainless handles that offer ideal support points when moving towards the bow.
The large door, located on the front of the console forming an integrated seat, gives access to its interior, which with dimensions of 1.05m x 1.05m x 1.60m constitutes an ideal room that can be configured in a separate bathroom with a sink, cabinets and nautical type toilet.

Stingher 30 GT

The instrument panel can accommodate large navigation devices, having the right inclination for the direct inspection of the operator even when driving seated.
The steering wheel is located on the port in a vertical position while the engine control is centrally and slightly higher at a suitable height for the operator's hand.
To the port and starboard of the helm dash, the very beautifully designed stainless steel handlebars of the driver and co-driver offer ideal grip when driving in standing position and will be appreciated when travelling in heavy weather conditions.

The helm seats are mounted on the front part of the leaning post, with their forward section split, which when reclining forms a comfortable surface, particularly convenient when driving in a semi-upright position.

The leaning post is centrally positioned leaving comfortable passageways to its port and starboard, 31cm wide.
It features a drawer-style refrigerator and can accommodate a sink and a gas stove constituting a small outdoor kitchen.

Stingher 30 GT

68 centimetres behind there is the aft sofa of the Rib, which with a width of 1.75 m can accommodate four comfortably seated persons. The fibreglass gunwales on both the right and left reach 68 cm in height, providing an increased sense of safety for the occupants.
Beneath the aft sofa is the largest storage space of the boat that hosts the batteries and can accommodate all our equipment.

The swimming platform is particularly comfortable and with dimensions of 0.49m x 1.50m ensures great freedom of movement and easy access to the outboard. On its starboard side, the auxiliary engine is mounted, while on its port side is the boarding ladder.

Stingher 30 GT

At sea

The Rib of our test had mounted a 2.6L Verado 350hp on its transom, which with a gear ratio of 1.75: 1 was turning the 4-blade 15.3" x 20" Bravo I XC stainless steel propeller.
This propeller is primarily characterized by the very high cup both on the trailing edge of its blades and on its blades’ tips, increasing thus its nominal pitch and rake.

Stingher 30 GT

Having 260 litters of fuel in the tank and four people on board, we turned our bow on the open sea of Thermaikos gulf and we were riding at the midrange rpm for a long time, wanting to get a first taste of the Stingher 30 GT behaviour.
The sea, of course, was «wearing» its good face, and only a short and curt ripple agitated the tranquillity of the bay.
Our speed was stable at 32 knots, with the tachometer showing 3800 rpm. The Rib was riding particularly pleasantly, with the large tubes that extend 55 cm out of the chine to keep the spray low and away from the deck. Without meeting the conditions that would allow us to evaluate the ride quality of the 9m Stingher, everything showed that the degree of the soft cruising was much higher comparing to the old hull design.

The Bravo I XC propeller kept us on plane at 2500 rpm with a speed of 12 knots, got the Rib on plane in 5 seconds and reached 30 and 40 knots in 10 and 16 seconds respectively.
At 3000 rpm our speed was 19 knots with a fuel consumption of 1.6 litters per nautical mile, while at 3500 rpm we were travelling with 27.5 knots burning 1.45 litters per mile. This was the most economical cruise speed with which we can travel for many hours relaxing and enjoyable, maximizing our autonomy.

Stingher 30 GT

At 4000 rpm we were running with 34 knots, consuming 1.5 litters per mile, while at 4500 rpm we gained another 5 knots with the fuel consumption rising to 1.79 litters per nautical mile.
At the midrange rpm, Stingher 30 GT showed excellent behaviour with a high degree of flexibility and friendly handling, keeping its tubes out of the water despite their large size.

At WOT, taking advantage of the long barrel and the tall propeller's cup, we trimmed the engine excessively out and we managed to record a top speed of 49.5 knots but we can not overcome 5600 rpm.

You can see our measurements in the following table:

Perfomance data by  e-Ribbing pdf

Taking a better look at the table of measurements, we find that after 4000 rpm the slip percentage is below 10%, which shows that the design characteristics of our propeller match very well to the Stingher’s hull, except of course its pitch which looks very long for the particular set-up.
The area of 5600 rpm the engine reached is of course very low and indicate that some interventions in this set-up are necessary so as to allow the engine to approach its maximum rpm limit recommended by its manufacturer, ensuring thus its proper functioning and longevity.

Stingher 30 GT

We must never forget that the maximum number of revolutions that our engine raises is one of the most important criteria that must be met at a very good set-up.

So, we recommend mounting the engine one hole lower (in higher position) and, of course, changing its propeller.
We could match a 4-blade 15 ¼" x 19" Bravo I LT propeller, the features of which seem that they will satisfy the requirements of the particular hull quite well.
With the above propeller it is certain that we will allow the engine to turn at 6200 to 6300 rpm, approaching its maximum rpm limit.

...keep Ribbing!

 

 

Stingher 30 GT
  • Lenght overall:: 8,90 m
  • Beam:: 3,00 m
  • Weight: 1.600 Kg
  • Fuel capacity: 2 x 300 Lt
  • Tubes' diameter: 0,45-0,66 m
  • Max HP: 500
  • Homologation CE: Κατηγορία B

Manufacturer:
Italboats s.l.r.
Main factory & Head office
Zona Industriale SP 79 Presicce-Alessan0, 73054 Presicce (LE)
Italy
Tel: +39 (0)833 722 553
www.italboats.com