Jim Blaney the owner of a 34’ Marine
Trader was complaining of Heavy black smoke, overheating
and poor performance. Ed Hislop from Cummins engines
in Grand Rapids checked the engine and confirmed
that the overloading was attributed to the propeller
and not the engine.
Jim was referred to Holland Propellers
in Michigan.
The original propeller was a 24 x
23 x 3 blade Hung Shen.
The details of the vessel were inputted
into Prop Scan's propeller sizing software which
revealed that the existing propeller did not have
enough diameter or blade area and too much pitch.
Another problem faced was the limitation
of how much diameter was allowed with the Keel and
strut to the rudder.
Using the Prop Scan software we custom configured
a propeller for the application. Sizing was a 24
x 18.5 x 5 blade propeller.
When the boat went back in the water Jim was amazed,
No black smoke, No over-heating, much better speeds
and power.
| Before Prop Scan |
After Prop Scan |
RPMs |
Speed |
Efficiency |
RPMs |
Speed |
Efficiency |
500
800
1000
1200
1400
1600
1800
2000
2200
2445 Wot
|
3.6
4.4
6.2
7
7.2
8
8.4
8.8
8.9
9.1
|
45.2%
38.2% |
600
800
1000
1200
1400
1600
1800
2000
2200
2400
2600 Wot |
3.7
4.1
5.2
6.0
6.6
7.6
8.2
8.6
8.9
9.5
10.2 |
61%
57.6%
53% |
Jim is extremely pleased with the performance gains
and that the engine is no longer overloading which
means there is considerably less internal wear on
the engine parts.
Jim plans on keeping the boat for some time and
looks forward to considerable traveling with the
boat next season.
|
