View Full Version : prop info

07-25-2009, 04:13 PM
I have an 04 X10 and need to change out a damaged prop, the boat has the 350hp engine. Could someone tell me what prop I have and what to replace it with, also some ideas of what I should pay and where to purchase.......Thanks

07-25-2009, 04:47 PM
After you remove the cotter pin and prop nut, you will see all the info relating to the prop either engraved or stamped into the prop hub that the nut is normally up against.
Go directly to the man that knows, Eric Johnson @ http://www.ojprops.com/contact_us or contact him by pm, EJ OJPROP, http://www.mastercraft.com/teamtalk/member.php?u=1537
He can advise you on the repair, repair it if repairable or set you up with the/a proper replacement. Be prepared to give him any info he may need, like boat model and year, engine size, transmission, current prop, function (skiing, surfing, boarding, etc.), ballast use, fuel load, gear, nominal # of passengers, etc. He will need it to determine the best prop for your application, should you decide to upgrade.

07-25-2009, 09:43 PM
Your boat came from the factory with an OJ cast 14/18 splined propeller.

There are much better props for that boat now (they are CNC'ed, for one thing). Follow Harold's advice and give Eric a call.

07-26-2009, 01:23 PM
Thanks for the info guys, what is CNC'ed mean ?

07-26-2009, 01:42 PM
Thanks for the info guys, what is CNC'ed mean ?

According to Wikipedia,
Numerical control (NC) refers to the automation of machine tools (http://en.wikipedia.org/wiki/Machine_tool) that are operated by abstractly programmed commands encoded on a storage medium, as opposed to manually controlled via handwheels or levers or mechanically automated via cams alone. The first NC machines were built in the 1940s and 50s, based on existing tools that were modified with motors that moved the controls to follow points fed into the system on paper tape. These early servomechanisms were rapidly augmented with analog and digital computers, creating the modern computer numerical controlled (CNC) machine tools that have revolutionized the design process.
In modern CNC systems, end-to-end component design is highly automated using CAD (http://en.wikipedia.org/wiki/Computer-aided_design)/CAM (http://en.wikipedia.org/wiki/Computer-aided_manufacturing) programs. The programs produce a computer file that is interpreted to extract the commands needed to operate a particular machine, and then loaded into the CNC machines for production. Since any particular component might require the use of a number of different tools - drills, saws, etc. - modern machines often combine multiple tools into a single "cell". In other cases, a number of different machines are used with an external controller and human or robotic operators that move the component from machine to machine. In either case the complex series of steps needed to produce any part is highly automated and produces a part that closely matches the original CAD design.

Bottom line is, CNC machines make each prop all but perfect every time (except for dynamic balancing) vs taking a cast prop from a mold and hand finishing it with a possible slight difference in each prop.