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Author Topic:   TURBO Offshore II Series Three-blade

jimh posted 06-11-2015 01:24 PM ET (US)
Here is some data from a propeller test I made a few years ago. I was doing some house cleaning, and I came across the raw data sheets from this test. I do not believe I have published this data before. There has been some recent discussion about TURBO-brand propellers, and here is a test of one of them. Thanks go to Tom Clark for providing the propeller for testing.
Propeller: TURBO Offshore II Series Three-blade 15-inch diameter x 18-inch pitch
Date: October 3, 2010
Location: Mullet Lake, Michigan, a large, fresh water, inland lake in northern lower peninsula
Boat: Boston Whaler REVENGE 22 W-T Whaler Drive
Engine: Evinrude 225-HP E-TEC, 2010 model year; gear ratio 1.86:1. (26:14)
Test conditions:
--boat was light with little gear, two people, 15-gallons fuel, canvas up;
--weather was very cool Fall conditions;
--sea state was waves less than 2-feet, some wind present.
Test Data
The data is raw data, not averaged or made in runs with or against wind and current.
RPM MPH MPG LOAD
1200 6.1 6.7 -
1450 7.3 4.7 -
1700 8.0 3.9 -
3600 20.0 2.5 -
4000 24.8 2.45 -
4200 25.8 2.4 -
4450 29.0 2.5 37
4600 29.6 2.5 37
4800 31.3 2.5 39
5000 33.2 2.45 42
5200 36.1 2.38 46
5650 39.0 2.2 52
5900 40.5 2.1 58
6100 41.7 2.0 96
Legend
RPM = revolutions per minute per the digital NMEA-2000 tachometer
MPH = statute miles per hour boat speed per the GNSS receiver
MPG = statute miles per U.S. gallon per the computation based on MPH and engine's own fuel flow data from NMEA-2000
LOAD = index of throttle position over range of 0 to 100 from engine's NMEA-2000 data; no LOAD data recorded at lower speeds
Description of the propeller style from the manufacturer:
"Exclusively designed for outboard powered offshore boats." Superlative load carrying ability and transom and bow lift for large, heavy offshore boats using outboard power. Provides outstanding speed and fuel efficiencies at cruise RPM, while reducing ventilation and slip normally caused by rough water and/or following seas. Excellent for 200 - 300hp V6 offshore-type applications in single or multiple engine configurations. Offshore II propellers also work well in sterndrive applications. Offshore II = 3-blade design.
Analysis of Test Data
The top speed of 41.7-MPH is in the lower end of the expected range for the boat when lightly loaded and in cooler weather. The fuel economy was not as good as had been obtained with other propellers in the mid-range cruising speeds. Fuel economy might have been affected by wind and waves, but in this data is generally lower than what is usually seen.

jimh posted 06-12-2015 07:26 AM ET (US)
A comparison of the TURBO Offshore II Series three-blade propeller can be made with three other propellers tested by referencing an earlier article at
REVENGE 22 W-T WD with 225-HP, Three Propellers
http://continuouswave.com/ubb/Forum4/HTML/006964.html

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Author	Topic: TURBO Offshore II Series Three-blade
jimh	posted 06-11-2015 01:24 PM ET (US) Here is some data from a propeller test I made a few years ago. I was doing some house cleaning, and I came across the raw data sheets from this test. I do not believe I have published this data before. There has been some recent discussion about TURBO-brand propellers, and here is a test of one of them. Thanks go to Tom Clark for providing the propeller for testing. Propeller: TURBO Offshore II Series Three-blade 15-inch diameter x 18-inch pitch Date: October 3, 2010 Location: Mullet Lake, Michigan, a large, fresh water, inland lake in northern lower peninsula Boat: Boston Whaler REVENGE 22 W-T Whaler Drive Engine: Evinrude 225-HP E-TEC, 2010 model year; gear ratio 1.86:1. (26:14) Test conditions: --boat was light with little gear, two people, 15-gallons fuel, canvas up; --weather was very cool Fall conditions; --sea state was waves less than 2-feet, some wind present. Test Data The data is raw data, not averaged or made in runs with or against wind and current. RPM MPH MPG LOAD 1200 6.1 6.7 - 1450 7.3 4.7 - 1700 8.0 3.9 - 3600 20.0 2.5 - 4000 24.8 2.45 - 4200 25.8 2.4 - 4450 29.0 2.5 37 4600 29.6 2.5 37 4800 31.3 2.5 39 5000 33.2 2.45 42 5200 36.1 2.38 46 5650 39.0 2.2 52 5900 40.5 2.1 58 6100 41.7 2.0 96 Legend RPM = revolutions per minute per the digital NMEA-2000 tachometer MPH = statute miles per hour boat speed per the GNSS receiver MPG = statute miles per U.S. gallon per the computation based on MPH and engine's own fuel flow data from NMEA-2000 LOAD = index of throttle position over range of 0 to 100 from engine's NMEA-2000 data; no LOAD data recorded at lower speeds Description of the propeller style from the manufacturer: "Exclusively designed for outboard powered offshore boats." Superlative load carrying ability and transom and bow lift for large, heavy offshore boats using outboard power. Provides outstanding speed and fuel efficiencies at cruise RPM, while reducing ventilation and slip normally caused by rough water and/or following seas. Excellent for 200 - 300hp V6 offshore-type applications in single or multiple engine configurations. Offshore II propellers also work well in sterndrive applications. Offshore II = 3-blade design. Analysis of Test Data The top speed of 41.7-MPH is in the lower end of the expected range for the boat when lightly loaded and in cooler weather. The fuel economy was not as good as had been obtained with other propellers in the mid-range cruising speeds. Fuel economy might have been affected by wind and waves, but in this data is generally lower than what is usually seen.
jimh	posted 06-12-2015 07:26 AM ET (US) A comparison of the TURBO Offshore II Series three-blade propeller can be made with three other propellers tested by referencing an earlier article at REVENGE 22 W-T WD with 225-HP, Three Propellers http://continuouswave.com/ubb/Forum4/HTML/006964.html