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Ok, here are the 'cliff notes' to the article comparing the two drive options of the Azimut 86S (taken from the above mentioned magazine):
Option 1: Two five-bladed props and Arneson drive transmission powered by twin 2000hp MTUs
-Min spd: 8.5 knots @ 875 RPM
-13 knots @ 1200 RPM
-15 knots @ 1400 RPM, has not lifted from water yet, sound level in saloon remaining below 68 db
-16.5 knots @ 1600 RPM hull lifts out of water then accelerates to 20.4 knots
-1800 RPM 2nd turbo cuts in and average spd is 34 knots with noise level 73 db at the helm or 75 db in the owners cabin
-40.3 knots @ 2100 RPM (flaps at 4 deg.) produces 80 db in the owners cabin and a slight vibration
-full throttle = 2350 RPM yields 45.2 knots with 80 db in the saloon and 84 db in the owners cabin
Option 2: twin Hamilton turbines with same powerplants as above
-joystick operation enables one to move the yacht almost any which way you please, spin 360 degrees, any direction, move diagonally even, and has a minimum spd of 3.5 knots
-4.7 knots @ 600 RPM
-1000 RPM noise level in the saloon is only 54 db
-10 knots @ 1200 RPM
-11.2 knots @ 1400 RPM
-13 knots @ 1600 RPM (which is 36% total power)
-2nd turbo engaged at 1800 RPM using 55% power, rises out of water at 18 knots yet noise is just 63 db at helm and no vibration whatsoever
-30 knots @ 2100 RPM using 74% power
-40.5 knots @ 2300 RPM (91% power) with just 76 db
-at 100% power exceeds 43 knots in calm sea, reaches 45 knots once electronically stabilized for optimal trim
-stop in just 5 seconds time in three times her own length by reversing the waterjet thrust
Conclusion: Although slightly slower (1.5 knots) the waterjet propulsion is without a doubt much more comfortable, easier to handle, and significantly quieter, never exceeding 76 db. Also the draft is shallower. |