It was the first time Corsair 33 had the eight-cylinder Verados on its back and so we came to temptation to make a short test so as to show to you its performance with the new engines of Mercury.
Corsair 33 has been re-tested in the past and you can check out Top Line Corsair 33΄ – 2 x 300hp Yamaha to see its detailed presentation as well as its performance with the twin Yamahas 300hp.
Although in both cases the engines had the same propellers, no real comparison could be made because the sea trials did not take place in the same area and of course the temperature difference was enormous.
In general, we were completely satisfied with the performance of Corsair 33 in terms of its ride quality, explosiveness and incredible flexibility, but we did not impress with its fuel consumption.
It would be worthwhile raising the engines a hole higher and compare the numbers we would record, which may seem to be even better.
On the day of our test the temperature was approaching 40 degrees Celsius, we were 3 people on board and we had 390 litters of fuel and 140 litters of fresh water in the two tanks of the Rib.
At 3000 rpm, we were travelling comfortably with 25 knots, recording the best fuel consumption of 1.84 litters per nautical mile.
Even if our speed was low, Corsair 33 was standing high above the sea surface with which it was perfectly aligned, showing us that it was ready to accelerate forward like an arrow even with the minimum push of the throttles.
At 3500 rpm, the propellers gave us their maximum lift with the A / V plate of the engines being clear outside the water and our speed reaching 31 knots, while burning 1.93 litters for each nautical mile.
At 4000 rpm we ran 37 knots with a fuel consumption of 2.05 litters per mile, while at 4500 rpm our cruising speed reached 43 knots consuming 2.2 litters per nautical mile.
At WOT, the engines reached their maximum rpm and our top speed reached 58.3 knots with great ease.
Acceleration was explosive across the whole rpm range with the Rib reaching 30 knots in 8 seconds, and it was quickly exceeding 50 knots. It is characteristic that even at these high speeds Corsair 33 showed absolute stability and seemed to run on "rails" even when we were attempting sharply maneuvers, gaining immediately our confidence.
You can see our analytical measurements in the following table:
The stability of Corsair 33 was impressive even when we were running with 58 knots, where I could just lift my hands off the wheel and just watch its aligned ride. The slip values after 4000 rpm were below 10% indicating a very good set-up, while at WOT we recorded the lowest slip percentage of 4.9%.
Of course, we can further improve the above set-up by changing the engines’ mounting height and selecting different propellers which will match better with Verados’ new gearcase.
Depending on our use, we can go to propellers that will give us higher top speed or to propellers that will give us higher cruising speeds, lower fuel consumption and even more strong acceleration.
Parodos Chr. Beka – 19004 Spata – Athens, Greece
Tel.: +30 210 6025 515