Corsair 33 of Top Line can be proud because undoubtedly it runs on one of the most famous Greek design and construction hull which has written a great history in Ribs’ races as well as in long trips.
Definitely, since the acts and results speak definitely louder even than the best words, let us remember the great win at the Red Sea Rally 2006 and the most recent legendary trip of 3500nm to the Azores in 2014, in which this hull demonstrated both its capabilities and seaworthiness riding into the huge and double waves of the Atlantic ocean as well as the excellent quality of its construction, carrying overloads with an average daily speed of 30 knots.
It is a hull that manages to maintain the ideal riding angle across almost the whole speed range, a fact due to the sheer geometry of all its features as well as its two double vented steps, leading to the well-known remarkable performance, in terms not only of achieving high-end speeds but also of the impressive accelerations, fuel consumptions and cruise speeds.
It is no coincidence that Corsair 33 of Top Line has been synonymous of the high quality construction and excellent riding both in calm and tough seas too, becoming a reference point for any rigid inflatable boat.
The internationally patented deep-V hull of Corsair 33 is characterized by two double ventilated steps and three spray rails in each side, ending at the transom on a specially designed narrow pad which helps the hull to get on plane faster and leads to the maximum possible top speed.
With a bow entry of 55 degrees and a transom deadrise of 24 degrees, Corsair 33 is born to run extremely smooth through rough water allowing us to travel long distances in comfort at particularly high cruise speeds.
In order to get the Corsair 33 deck in its present deck layout, it has undergone significant modifications to the foredeck, the swimming platforms and the helmseats, which have been limited to about 14 cm in total width so as to leave more free space for the passengers’ movement.
The foredeck forms a large flat platform which gives very easy passage on board, without any obstacles having attached the cleats at its port and starboard side, which should be adopted by all manufacturers some time in the future. Opening the big hatch, the windlass and the large locker’s anchor that hosts the chain are revealed.
A large sundeck is formed in the bow area which can accommodate two adults. Below this, we find two large storage areas, the watertightness of which is ensured by the deep channels around the openings. Here is also located the water tank with capacity of about 120 litters.
Between the bow sundeck and the console, there is a large in-deck storage space that can accommodate an optional fuel-tank of about 200 lts, which can be proved very useful in case of travelling long distances.
The console is centrally positioned leaving comfortable passages on its both sides for the passengers. A large tilting door is on the front side of the console inside of which there is the toilet-bathroom. Its dimensions give a comfortable space even to a tall person and it includes a sink, a nautical toilet with sewage-tank and a shower wand.
Among the steering wheel, located on the port side of the console, and on the central engines’ controls, there are the switches of the boat’s total equipment. The dashboard is elegant and functional having the proper space for the installation of even large electronic devices, while it is surrounded by a stainless steel rail providing very good hand support to the driver and co-driver. The analogue gauges of the engines are on the left side of the dash, while the necessary navigation and communication devices are on the right side.
The helm has two bucket adjustable seats, which offer very good visibility to both the instrument panel and the bow while they provide ideal support when driving into the bolster position and of course we will appreciate them especially when riding in rough seas.
Behind the helmseats there are two very useful and secluded lockers, which can also be used as a storage compartment for clothes
In the stern area, a four-seater independent sofa is formed, under of which a large rectangular locker is housed. Behind it the large aft sundeck is extended, below of which there is the largest storage space of the boat. Of course, on request, the entire stern area can also be converted to a large Π-shaped sofa with an adjustable table in between.
On the back of the aft sundeck, we find two very useful storage areas where we can place all the necessary equipment for anchoring. To the port and starboard of the four-seater sofa and the sundeck two wide platforms run offering easy access on board.
Our test Rib was powered with twin 300hp Yamaha four-stroke outboards, which have a gear ratio of 1.75: 1 and were propped with 14 5/8"x23" Revolution four-blade stainless steel propellers.
The twin Yamaha 300hp lifted us onto plane in 4 seconds and, carrying four people and about 300 liters of fuel in our tank, we reached a top speed of 62.5 knots while consuming 202 liters per hour. The most economical cruising speed was 29 knots at 3000 rpm, burning 1.68 liters for each nautical mile. A really impressively low fuel consumption even for a single outboard powered rib, which gives us an autonomy of 178 nautical miles when our tank has 300 liters of fuel.
Corsair 33 was held on plane at 2000 rpm, at a speed of 12 knots, (one of the lowest minimum rpm to plane) a fact that is particularly beneficial when traveling in very hard seas.
At 4000 and 4500 rpm, the cruise speeds were 41 and 47 knots respectively - much higher than the ones of the ribs of its class -, numbers which indicate that the propellers were slipping quite a bit in these rpm - an indisputable indication of an ideal set-up -, allowing us to cover long distances very quickly.
The most impressive, of course, is that we can maintain these great cruise speeds even when the weather conditions are not the best ones, a fact that is much more important than even the achievement of the ultimate final speed.
The accelerations were explosive with an immediate throttle response, a fact that apart from the engines and the hull design - which allows the hull to accelerate faster by reducing wetted surfaces - is mainly due to the ideal rib’s setup
The relatively high engines mounting height combined with the specific propellers which are designed to run near the sea surface, gave us an ideal set-up that really did not lag anywhere, and this is shown by the amazing numbers we recorded throughout the engines rpm range.
You can see our detailed data in the PDF below:
In addition, history has shown that Revolution particularly «likes» the stepped hull of Corsair 33, the characteristics of which almost fit in with its geometry, leading to maintaining an ideal ride attitude across the entire rpm range and achieving impressively low slip numbers.
But beyond the impressive data, the quality of the ride was excellent, just like the bite of the propellers, giving us an absolute control of the rib over both the sharp turns and the sudden changes of direction, staying completely stable on its track. The handling and stability in every condition were pretty amazing, with quite great agility that even the single engine powered ribs would envy. This is a very important element that coupled with the impressively soft hull depreciations allow us to travel at high speeds in rough seas.
By raising the port engine completely out of the water we tried to get on plane only with the starboard engine. Corsair 33 seemed quite reluctant to «get out of the hole», due to the propellers’ pitch, but finally it began to plane and could be held on plane at 3000 rpm at a speed of 14 knots, while at 4000 rpm we were travelling with 25 knots. At WOT we reached 5000 rpm with 40 knots of speed and a consumption of 95 litters per hour. If we analyze these numbers we will see how really they are really impressive.
Our tests have shown that we can still raise the engines by one hole higher, of course, if we are interested in reaching 65 knots of top speed, sacrificing some of the performance at the lower rpm. In this case, we have to switch to 25 inches of pitch Revolution propellers. If we want to switch to larger diameter propellers, then we recommend propellers with smaller blade area or pro finished propellers with shorter tube so that not only won’t they negatively affect the ride attitude of the rib - which will reduce performance and create handling problems – but they will also allow us to match even longer pitch.
Parodos Chr. Beka – 19004 Spata – Athens, Greece
Tel.: +30 210 6025 515