Marine engine environment
5
Typical sample of a planing hull and how displacement and engine output tolerances effects
performance
Nominal engine output
Engine output ±3%
Propeller precision
tolerances ±3%
Nominal displacement 3 tons
Displacement ± 3%
Thrust/
power
Speed
Knots
20
22
24
26
28
30
32
34
36
38
40
20
22
24
26
28
30
40
38
36
34
32
Max. tolerance
range
Displacement / hull
resistance
C
Engine output / Thrust
A
B
C)
A)
B)
Production tolerances
In order to ensure optimal performance of the ves-
sel and long engine life, correct propeller size is es-
sential. Selecting the correct propeller will enable the
engine to develop its full power and provide the per-
formance that is expected.
There are a number of factors with their tolerances
that can greatly affect the performance of the vessel.
These must be recognised for correct engine/propel-
ler selection. These factors are:
A) Engine power can vary within international power
standard tolerances.
B) The calculated hull resistance/displacement may
vary within certain limits.
C) The power absorbed by the propeller with regard
to propeller manufacture precision tolerances gen-
erally affects engine rpm.
Содержание D11 series
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