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Triple-screw vessels Article rated 3.0/5.0
On a triple-screw vessel, we usually allow the center propeller to be a pitch lighter than the outer two. Does PropExpert compensate in any way for this?   Not directly, but you can model this ...
Matching existing propeller performance specifications Article rated 3.0/5.0
I have a propeller drawing that indicates it was designed for a particular power. However, when evaluating this propeller in PropExpert, I cannot achieve that power. Why? Here area few reasons why th...
Surface-piercing propellers Article rated 3.0/5.0
Can PropExpert be used to size and evaluate surface-piercing propellers? PropExpert does not support surface-piercing propellers (SPPs) – and the reasons for this are many. First, there are fe...
Mixer propellers Article rated 3.0/5.0
Can you advise how I might use PropExpert to size a propeller for commercial mixing of water in a tank? PropExpert was designed as a tool for sizing marine propellers on boats and ships, of course &n...
Pushboats and multiple barges Article rated 3.0/5.0
I need to size a propeller for a tug that is to push four barges. Can you help me? It is probably easiest to think about this type of application as a tug or pushboat with a large added drag, rather ...
Strategies for Workgroup Licensing Article rated 3.0/5.0
We are planning to upgrade four of our computers in the office. One of these computers currently runs PropExpert (as a stand-alone license with the security key). Is it possible to run PropExpert from...
Kaplan: blades and BAR Article rated 3.2/5.0
How do we change the BAR for a Kaplan-style propeller? Some of our customers request less BAR that what the program offers (e.g., 0.65 DAR on 3 blades, but they want 0.55). One inconvenience of the K...
Bow thrusters Article rated 3.0/5.0
Can you give me any guidance on using PropExpert to size bow thrusters propellers?   Predicting performance of propellers in a pipe tunnel (e.g., bow thrusters) can be done in PropExpert, but y...
Fuel rate definition Article rated 3.0/5.0
When creating or modifying a file in the “My Engines” library, what is the correct fuel rate value that I should input – crankshaft fuel consumption or propeller fuel consumption? In...
Outboard vs inboard turning propellers Article rated 3.0/5.0
Which is better – propellers that turn inboard or outboard? The typical orientation is for propellers to turn “outboard” (at the top) as viewed from the stern. (For example, a starb...
Evaluating skewed propellers Article rated 3.0/5.0
Skew is the “sweeping back” of a propeller blade, as shown in the image below. These two propeller blades are identical, except for skew.
Sizing for Gear ratio Article rated 3.0/5.0
I am trying to determine the best gear ratio for a known horsepower and wheel size. I am sizing for only Gear ratio (leaving Blade area ratio, Diameter and Pitch as Fixed), and PropExpert is coming up...
Towpull versus Bollard pull Article rated 3.0/5.0
What does the value “Towpull” under Sizing Details page relate to?  For instance, if I am wanting to know what the bollard rating will be of a prop-gear-engine-hull combination, shoul...
Simple estimate for blade area ratio Article rated 3.2/5.0
Is there a simple way to estimate the blade area ratio for a propeller using basic measurements? I have the root-to-tip blade length, the average width, number of blades, and diameter. We can use a s...
Tip clearance and calculations Article rated 3.0/5.0
I would like to know what values are used for propeller tip clearance in PropExpert. For example, if I enter maximum propeller size as 28″ in the vessel screen and then use a 28″ propeller...
Troubleshooting a Workgroup License setup Article rated 3.0/5.0
We have a four-user Workgroup License with one user on a stand-alone key, and three licenses on the network key. I have installed PropExpert for my workgroup users, but they cannot run the software. C...
 

 
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