By Thomas P.

With an overall length of 6.19 meters and a maximum width of 2.67 meters, the Indigo 20 Rib is a beautiful combination of a functional deck and a well-designed hull that offers soft and stable ride with low fuel consumption.

Indigo

With a construction of high level quality and the simultaneous use of very good accessories, Indigo Marine, created in 2008, has as its primary goal the design and construction of high standards and very robust rigid inflatable boats.
With a wide range of models, the Indigo Marine shipyard claims its own market share having as great advantages the above features.

Indigo 20 is aimed primarily at those who want to combine pleasure and ride quality with low fuel consumption at cruising speeds.

Its hull is characterized by its classic boatbuilding lines but with the right proportions that make it particularly seaworthy.

Two spray rails with a slight negative angle run through each side of the hull, with the highest one reaching until the transom and the lowest one ending 46 cm in front of it, contributing to the very good cruising angle held by the Rib throughout the whole rpm range during our sea trial.

Indigo

The keel of the hull is gradually transformed into a long pad that reaches the transom at its maximum width of 8 cm, increasing the buoyancy and reducing the wet surfaces and planning time. 11 cm higher than the hull is the built-in bracket which extends to a length of 30 cm while the chine starts with a height of 20 cm in the bow area and gradually decreases to reach 11 cm in the stern area.

On deck

The nice colors of our test Rib in combination with the synthetic teak with which the whole deck was lined compose a very attractive ensemble. Indigo 20 is ideal for day trips without of course being deprived of abilities for long voyages and nautical camping.

Indigo

The hard nose is extremely wide with dimensions of 1.10 meters long and 0.87 meters maximum width ensuring a very comfortable step for our entry or exit from the boat. The hatch at the back gives access to its interior where the windlass and the anchor chain are housed while there is enough free space for the bow lines of the Rib.

In the area of the bow there is a central trapezoidal locker which provides a fairly large storage space and a smaller one on the port side which is particularly useful for smaller items. With the appropriate addition it is possible to create a sunbathing or sleeping bed with a maximum width in the area of the legs 1.23 meters, a minimum width in the area of the head 0.63 meters and a total length of 1.83 meters.

Indigo

Indigo

The console, which is very elegant, is located on the starboard leaving a narrow but very useful passage for our movement on the right side of the deck. On the port side there is the main passageway which ensures comfortable front and back access to the bow or stern.
At the front of the console there is a built-in single seat, especially useful during cruising or when turning the bow area into a small dining one.

The steering wheel is positioned at a very good height so that we can drive effortlessly and comfortably when we are standing or sitting. The engine control is located outside the console, while to the port of the steering wheel the electrical switches of the boat are located in a row.

The dashboard is properly designed with the necessary space for the installation of the instruments and the navigation screen, while it has a very good forward inclination so that it is possible to inspect immediately the indications of each device even when driving upright.
Under the steering wheel there is a large hatch that gives access to the interior of the console where the batteries and the central switch of the Rib are located.

Indigo

It is worth noting the circular stainless steel rail that hugs the windshield and ends right and left of the steering wheel, offering the necessary support we need, something that will be especially appreciated when developing high speeds or when traveling in heavy weather conditions.

The double helmseat is convex to serve the semi-upright driving posture while located on a polyester bench behind of which there is a large hatch that gives access to its spacious interior constitutes a deep and useful storage space.

Indigo

Further back we find the three-seater stern sofa that can comfortably accommodate three adults, under of which the large stern storage space is formed.
Behind the backrest of the sofa and to the port and starboard of the engine’s basin, comfortable spaces are created in which we can move easily having easy access either to the ladder or to the auxiliary engine.

At Sea

On the polyester bracket of Indigo 20, a four-cylinder 140hp Suzuki engine was hung the lower unit of which was turning a three-blade 14"x21" Suzuki propeller.

Indigo

We were two people on board with 50 liters of fuel and no special equipment apart from the absolutely necessary one. The weather conditions were perfect and thus allowed us to evaluate with comfort the Rib, recording of course the most ideal numbers related either with the fuel consumption or acceleration and cruising speeds.

It was obvious that we had in our hands a seaworthy and robust boat capable of traveling safely even in bad weather conditions. Every time I was turning our bow towards our wakes, I received very sweet depreciations as a result of the deep deadrise angle that we measured 24 degrees at the transom.

The throttle response was very good with the planning speed not exceeding 4 seconds, while the Rib reached 30 knots in 10.3 seconds.
After a short intense of the bow rising, the Indigo 20 was standing on plane at 2800 rpm maintaining a speed of 12 knots.
At 3000 rpm our speed was 13 knots with a fuel consumption of 0.75 liters per nautical mile, while at 3500 rpm we recorded the most economical cruising speed traveling at 17 knots burning 0.70 liters per mile.

Indigo

At 4000 rpm we were running with 22 knots with the consumption insisting on being low at the level of 0.72 liters per mile. We left the engine for a long time to operate at these rpm and the boat was traveling very comfortably maintaining an excellent ride attitude, a clear indication of a very good and well-balanced set-up.

At 4500 rpm the hull came almost completely out of the water and with the boat maintaining a straight ride we reached 26 knots with a fuel consumption of 0.77 liters per mile while at 5000 rpm we ran with 33 knots burning 0.8 liters per nautical mile.
It is noteworthy that only at WOT the consumption exceeded 1 liter per mile with the engine reaching 6000 rpm and the Rib 36 knots.

You can see our detailed measurements in the following table:

Perfomance data by e-Ribbing pdf

Regarding the specific boat-engine combination, we would say that it is a very good set-up that does not need more horsepower to move efficiently. Of course, this does not mean that the hull cannot handle more horses. If we want to mount engines with higher horsepower we must calculate the weight of the engine so that the center of gravity of the boat does not shift backwards which will lead to a change in the cruising angle especially at low speeds.

Indigo

If we desire to improve further the performance of this set-up, there is certainly room for improvement.
We can unreservedly fit a Suzuki 3-blade 14"x19" propeller replacing the one of 21" pitch we had in our test, thus allowing the engine to reach its maximum rpm even when the Rib will carry its usual loads. Moreover, we will improve even more the acceleration and throttle response, while the Rib will be standing on plane at lower rpm without affecting its behavior in wavy conditions.

...keep Ribbing!

 

 

Indigo 20
  • Overall length: 6.19 m
  • Beam: 2.67 m
  • Dry weight: 800 kg
  • Fuel capacity: 210 lt
  • Max power: 150 hp
  • Minimum power: 115 hp
  • Homologation CE: Category C

Manufacturer:
INDIGO MARINE
Adrianou 37, Koropi, Greece
Tel +30 6973 301 640
www.indigo-ribs.com
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