SAE J 1286-2017 Thrust Test Device.pdf

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4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/standards.sae.org/J1286_201703 SURFACE VEHICLE RECOMMENDED PRACTICE J1286 MAR2017 Issued 1980-04 Reaffirmed 2009-

5、05 Revised 2017-03Superseding J1286 MAY2009 Thrust Test Device RATIONALE Scope of the standard needs revision due to the development of higher power electric outboards that are sold by horsepower, rather than thrust capacity. 1. SCOPE This method covers electric outboards that are rated in terms of

6、static thrust. 1.1 Purpose To establish a uniform test method to measure static thrust of an electric outboard. 2. REFERENCES There are no referenced publications specified herein. 3. EQUIPMENT 3.1 Storage batteries and a separate power source necessary to maintain the battery terminal voltage when

7、loaded with the electric outboard under test, or a controlled voltage DC power supply of capacity appropriate for the unit under test: 12 V 0.12 V for the advertised 12 V model and 24 V 0.24 V for the 24 V model. 3.2 A voltmeter, to measure the battery terminal voltage of the unit under test, which

8、has a range such that the indicated voltage will have a repeatable accuracy of 1% or better. 3.3 An ammeter, to measure the current draw of the unit under test, capable of measuring the maximum intended current to within 1% accuracy. 3.4 The thrust device shall be constructed as shown in Figure 1. 3

9、.5 The water source, such as a lake or river, where the water has negligible flow and is sufficiently calm to obtain stable and repeatable readings. The water flow, if any, should be at right angles to direction of thrust. The water should be unobstructed for 3 m (10 feet) in all horizontal directio

10、ns excluding the mounting structure and a minimum of 91 cm (3 feet) deep at the test site. If a floating device (boat, raft, barge, etc.) is used, it must be stationary. An alternate water source may be used if it is baffled to minimize circulating currents. SAE INTERNATIONAL J1286 MAR2017 Page 2 of

11、 3 Figure 1 - Thrust test devise 4. PROCEDURE I - STEADY STATIC THRUST AND CURRENT 4.1 Install the electric outboard in the thrust device and connect the battery leads provided by the manufacturer to the power source (see Figure 1). 4.2 Calibrate the thrust device by the use of the suspended weights

12、 or a scale accurate to within 2% which is applied to the shaft of the electric motor. Enough points should be taken to establish a calibration curve. 4.3 Install the thrust device in such a manner so that the highest point of the electric outboard propeller is 30.5 cm (12 inches) minimum below the

13、surface of the water (see Figure 1). 4.4 Connect the storage batteries of DC power source, turn on the motor, and adjust the power supply to maintain the required voltage, making certain that the conductors do not produce any effect on the zero set of the thrust measuring device. 4.5 Run the electri

14、c outboard with the control at the maximum setting, at the rated voltage, 0.5 V for 15 minutes to stabilize temperature. 4.6 Water temperature during test shall be no lower than 11 C (52 F). 4.7 Record thrust indicated by the thrust devices load cell. 4.8 Record motor amperes at the same time the th

15、rust is measured in 4.7. 5. PROCEDURE II - PULSE THRUST AND CURRENT 5.1 Set-up test as in 4.1 to 4.4. 5.2 Run the electric outboard with the control at the maximum setting at the rated voltage (see 3.1). At 10 seconds simultaneously read thrust and current, then turn unit off for 2 minutes. SAE INTE

16、RNATIONAL J1286 MAR2017 Page 3 of 3 5.3 Record thrust indicated by the thrust devices load cell. 5.4 Record motor amperes. 5.5 Repeat 5.2 to 5.4 four more times. 5.6 Pulse thrust and current shall be the average of the five readings. 5.7 Water temperature during test shall be no lower than 11 C (52

17、F). 6. NOTES 6.1 Revision Indicator A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. PREPARED BY THE SAE MARINE TECHNICAL STEERING COMMITTEE