15454 version 3
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Demonstrate knowledge of trailer boat propeller operation, types,
servicing, and installation procedures
Level
3
Credits
4
Purpose
This theory-based unit standard is for people in the trailer boat repair
industry. People credited with this unit standard are able to demonstrate
knowledge of: propeller function and operation; propeller types and
terminology; and propeller servicing.
Subfield
Motor Industry
Domain
Trailer Boat Systems
Status
Registered
Status date
21 September 2007
Date version published
21 September 2007
Planned review date
31 December 2012
Entry information
Open.
Accreditation
Evaluation of documentation and visit by NZQA and
industry.
Standard setting body (SSB)
NZ Motor Industry Training Organisation (Incorporated)
Accreditation and Moderation Action Plan (AMAP) reference
0014
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
Definition
Service information may include but is not limited to – technical information of a
vehicle, machine, or product detailing operation; installation and servicing
procedures; manufacturer instructions and specifications; technical terms and
descriptions; and detailed illustrations. This can be accessed in hard copy or
electronic format and is normally sourced from the manufacturer.
 New Zealand Qualifications Authority 2016
15454 version 3
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2
The following website publication may be useful as reference material when
completing this unit standard:
Everything you need to know about propellers, available at:
http://sites.mercurymarine.com/portal/page?_pageid=126,48572,126_49259&_dad=p
ortal&_schema=PORTAL.
3
This unit standard can lead on to Unit 15465, Check and determine the suitability of a
propeller for a trailer boat.
Elements and performance criteria
Element 1
Demonstrate knowledge of propeller function and operation.
Performance criteria
1.1
The role of a propeller is described in relation to a boat’s handling and
performance.
Range
1.2
transmitting power from the engine to the water, causing
movement to the boat.
The operation of a propeller in the water is described in accordance with service
information.
Range
water flow past the blades, negative pressure and positive
pressure creating thrust.
Element 2
Demonstrate knowledge of propeller types and terminology.
Performance criteria
2.1
Types of propeller are identified in accordance with service information.
Range
2.2
The differences between left and right hand propellers are identified in
accordance with service information.
Range
2.3
type of hub, type and number of blades.
rotation, blade position.
Parts of a propeller are identified in accordance with service information.
Range
blade face, ribs, leading edge, hub, shock absorber, diffuser,
diverging ring, converging ring.
 New Zealand Qualifications Authority 2016
15454 version 3
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2.4
Types of blades are described in accordance with service information.
Range
constant pitch, progressive pitch.
2.5
Propeller diameter is identified from a diagram.
2.6
The purpose of cupped blades is identified, and how cupping increases rake
angle is described in accordance with service information.
2.7
Blade rake is identified from propeller diagrams, and the purpose of rake is
described in accordance with service information.
Range
2.8
positive, nil, negative.
Operation of diffuser, diverging, and converging ring is described in accordance
with service information.
Range
outboard through hub exhaust.
Element 3
Demonstrate knowledge of propeller servicing.
Performance criteria
3.1
Limitations to propeller repairs are identified in accordance with service
information.
Range
3.2
Procedures to measure a propeller are identified in accordance with service
information.
Range
3.3
blades, hub.
diameter, pitch, coding.
Detrimental effects of water flow past a propeller are identified in accordance
with service information.
Range
ventilation, cavitation.
3.4
Propeller installation procedures are described in accordance with service
information.
3.5
Procedures to repair propeller assemblies are described in accordance with
service information.
Range
blades, hub, shaft.
 New Zealand Qualifications Authority 2016
15454 version 3
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Please note
Providers must be accredited by NZQA, or an inter-institutional body with delegated
authority for quality assurance, before they can report credits from assessment against
unit standards or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by NZQA before they can register
credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for organisations
wishing to develop education and training programmes, such as minimum qualifications for
tutors and assessors, and special resource requirements.
Comments on this unit standard
Please contact the NZ Motor Industry Training Organisation (Incorporated)
janet.lane@mito.org.nz if you wish to suggest changes to the content of this unit standard.
 New Zealand Qualifications Authority 2016