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Product Description

Captain Propeller 10.25x12 Fit Mercury Outboard Engine 25hp 28hp 30hp 10 Tooth Spline

$119.99
Maximum quantity available reached.

Color: black

Features:

  • 1. Factory Direct Supply, OEM Grade Quality. Our Propellers make your installation process easier.
  • 2. Model Description: OEM performance for Mercury Outboard Engines 25-30HP
  • 3.Size & Material: 10.25 Diameter, 12 Pitch, 10 Tooth Spline ; Right Rotation; 3 Blade ; Black Color; adopt High Quality Aluminum material
  • 4. Outstanding Quality: Based on fine raw material, superb manufacturing process and strict quality control, our propellers are more durable.
  • 5. After-sale Promise: If the products have any quality problems, we can offer unconditionally return.

PartNumber: CMAU10.25x12

UPC: 754083737529

EAN: 0754083737529

Model: CMAU10.25x12

Item Condition: New

  • Q How to pick the correct propeller?

    A  Selecting the right propeller is an important factor in maximizing your boat's performance, while allowing it to operate in the recommended rpm range.  Determining the correct size and style of prop will keep the engine from over-revving, while allowing it to achieve the maximum horsepower at the lowest rpm's. 

    NOT ALL PROPS ARE THE SAME!

    Size - Props are described by referring to diameter and pitch.  Diameter is twice the distance from the center of the hub to the tip of any blade.  Generally smaller diameter props correspond with smaller engines and boats or higher speeds.  Larger diameter props correspond with larger engines and boats or slower speeds.  Pitch is the forward movement of a propeller through one complete revolution.  Pitch can be thought of as speed.  The higher pitch prop the engine can turn, the faster the boat will usually go. 

    Number of Blades - Sufficient blade area is needed to properly distribute engine power across blade surface.  Too little blade area causes high "blade loading", which means the prop can't absorb all the power transferred by the engine.  With increased blade are you can decrease the blade diameter, but often with less efficiency at higher speeds.  A 3-blade prop is considered the best combination of blade area and low blade loading.  When the number of blades is changed, diameter and pitch may require a minimal adjustment to remain in the safe blade loading range.  For most purposes 3 and 4-blade props can be used interchangeably on outboards and sterndrives (I/O) without much of a change in performance. 

    Material - Propellers are made of either composite, aluminum, or stainless steel.  Composite props are good, durable, and inexpensive.  Aluminum props are the most common.  They are suitable for the widest range of applications.  Stainless steel props offer higher performance and better durability. 

    Cupped Propellers - Special curved trailing edges enable the prop to cut through the water better.  Cupped props allow most boats to achieve a higher top-end speed or at least the same speed at a lower engine rpm.  They also promote more efficient fuel consumption. 

    Wide Open Throttle (WOT) rpm Range - When selecting a prop, the goal is to choose one that allows the engine to reach its optimal WOT.  This is generally between 5000 and 5500 rpm, depending on engine type.  This information is usually included in the owner's manual of a new boat or engine. 

    If your current prop's performance is within manufacturer's WOT guidelines, choose a replacement prop which duplicates the diameter and pitch of your current prop. You might consider upgrading to a different material such as stainless steel. 

    If your current prop is unsatisfactory - What if your engine operates at the wrong rpm at WOT?  Pitch and rpm have an inverse relationship.  Increasing pitch reduces rpm and reducing pitch increases rpm.  A 1" change in pitch will result in a 200 rpm change in engine speed.  Therefore, if your engine operates below the proper rpm, consider a propeller with less pitch.  If your engine over-revs, consider increasing the pitch. 
    You might also consider changing the propeller size to affect a specific performance attribute. A lower-pitch power prop makes it easier to pop skiers out of the water.  Tournament bass boats may need more top end speed and should use a prop with a higher pitch.  Houseboats and cruisers care more about efficiency at displacement speeds, therefore they require a lower pitch to achieve low-end power and the largest diameter their lower unit can handle. 

  • Q Basic Boat Propeller Information?

    A
    The follwing information is provided to help you understand the basics involved in selecting an appropriate propeller for your boating use. It is not meant to provide expert advice. The best fit for your propeller application is determined by several factors, including your boat's current performance and condition. If unsure whether a propeller is right for you, or if you have specific questions about a propeller's application, consult Captain.
     
    New and Used boat props
     
    3 or 4 Blades?
    A 3-blade propeller usually offers top speed performance while a 4-blade propeller provides maximum thrust and smooth cruising operation.
     
     
     
    Diameter:
    Diameter is the distance across the propeller from blade tip to blade tip. Calculate the diameter of the propeller by measuring from the center of the shaft hole to the tip of a blade and then multiply by 2. (Example: a Propeller measures 7 1/4 inches from the center of the shaft to the outermost tip of one of its blades. The diameter = 7 1/4 X 2 = 14 1/2 inches)
     
    Pitch:
    Pitch is the distance a propeller will move through the water for each revolution. For example, a 21" pitch propeller should move a boat forward 21" each time it rotates, assuming there is no slippage.
     

    Right Hand or Left Hand Rotation:
    This refers to whether the propeller rotates clockwise or counter-clockwise. In most cases, right hand propellers are used for single engine applications, and both a right hand and a left hand propeller are used for twin engine application to achieve better steering control.
     
    Cupped Blades:
    This is a technique used to enhance the performance of propellers under certain conditions: a cupped propeller will exhibit very high efficiency at high speeds as well as minimize cavitation under heavy loads. To determine if you have cupped blades, feel the blade tips of your prop. They should curve upward on the edges.
     
    Rake:
    Rake is a special design feature. Positive rake benefits from normal bow lift to permit the use of a larger diameter propeller, while negative rake can provide extra blade strength for use in very high speed application. A propeller with 20 degree rake has blades that meet the propeller shaft at an upward 20 degree angle
     
    Quality boat propellers
     
    Additional propeller replacement considerations:
    Year, brand, model and horsepower of your exisiting motor.
     
    What is the current propeller's diameter? (see Diameter heading)
     
    Aluminum or Stainless Steel?  
     
    Type of boat do you have? Cruiser, Ski, runabout, bass, pontoon...
     
    Choosing the right propeller for your boat can be one of the most important choices for a boat owner.  There are manufacturer websites available designed to help you determine the best propeller for your boating application based on specific information, but it is always a good idea for you to check with Captain and your local dealer.

  • Q How to change a boat propeller?

    A
     
    You can learn how to change a boat propeller by yourself instead of calling in the professionals.
    All you need to do is have the right tools, some help from a few friends and you will soon be sailing and having fun.
    What You Will Need: New Propeller,Ratchet Set,Gloves,Socket Wrench,Prop Puller,Marker or Pencil
     
    Step 1 – Buy a New Propeller
    Take a trip to the local boat supply store and buy a propeller for your boat. There are two types of propellers; steel and aluminum. It is better to choose the steel propeller as it will last longer than the aluminum propeller. Though it is a bit more expensive, it is worth the investment.
     
    Step 2 – Buy a Prop Puller
    Pick up a good prop puller at the supply store as you will need this to remove the old propeller easily. A prop puller can save you more than half the time if you try to remove the propeller with your hands.
     
    Step 3 – Mark the Position of the Old Propeller
    Take a marker or pencil and mark the position of the old propeller before you take it off. This will help you know the correct position to install the new propeller.
     
    Step 4 – Mark the Location on the Propeller Shaft
    Mark the position of the old propeller on the shaft so that you will know how far the new propeller should go on the shaft.
     
    Step 5 – Loosen the Nut
    Begin to loosen the retaining nut to remove the old propeller. Use the ratchet and turn one blade at a time. Remember not to loosen the nut completely. In case the propellers get stuck, you can use the prop puller to remove the blades. This will make the job easier.
     
    Step 6 – Remove the Propeller
    Once you have loosened the retaining nut and the propeller is loose, remove the old propeller from the shaft by pulling it off.
     
    Step 7 – Check for Damages
    After removing the old propeller, check the shaft for any damages.
     
    Step 8 – Check the Key Way
    Check the key way for any damages before installing the new propeller.
     
    Step 9 – Unpack the New Propeller
    Unpack the new propeller from its package and keep the nuts ready.
     
    Step 10 – Install the New Propeller
    Slide your new propeller onto the shaft taking note of the course of the key way.
     
    Step 11 – Position the Propeller
    Use the markings you made earlier in step 3 to align the new propeller. Make sure your new propeller is in the right position and the right place on the shaft.
     
    Step 12 – Fix the Nut
     
    Once the new propeller is in the right place, use a wrench to tighten the nut onto the shaft. Make sure the nut is tightened well. That’s all that you need to do to get your new propeller fixed on your boat. Happy Sailing!

     

  • Q Captain Marine Has The Propeller You Need

    A
    Captain Marine
     
    Boats of all sizes use propellers. Captain Marine is a manufacturer, based in Qingdao city, Shandong Province in China, Captain Marine locations can be found throughout the SouthAmerica, Europe, and the Oceania. The Captain Marine serves all types and styles of boats through the manufacturing and sales of top performance propellers.
     
    Captain Marine serves such a large population of customers that we must consider each customer's needs individually. The variety of styles and types availability ensure that customers have the ability to find the product they need through Captain Marine. Every boat requires a propeller but not every propeller will work on any boat.
     
    The diameter of a propeller is one of the key bits of information needed when selecting a propeller because they come with diameters that range from 3 inches to 96 inches. The difference between an outboard and an inboard is another aspect that will make a difference in the type of propeller you will want to purchase.
     
    At Captain Marine the staff can help you find the perfect props for your boat. You may have questions about the difference between a 3 blade or a 4 blade propeller. Or you could be curious if you should try a stainless steel prop or an aluminum one. Whatever your question may be, at Captain Marine they will help you find the answer and the right product.
     
    Captain Marine serves boat owners of all varieties. Customers are important and their questions even more so. When you are trying to determine what type of prop is best for your boat it's vital to get the advice from an expert. The employees and owners of Captain Marine are not only boat enthusiasts, they live to serve other boat enthusiasts.
     
    At Captain Marine all customers are important. It doesn't matter if you are looking for a small prop to troll or you need a large prop for the big waves of the Great Lakes or the Gulf of Mexico. At Captain Marine , staffs are knowledgeable and excited to serve you.
     
    Captain Marine carries the entire line of inboard and outboard propellers for your boat.  Contact the experts at Captain Marine today to get the best propeller for you marine engine.

Located in Qingdao city ,Shandong province of China, Captain Marine provides  a wide range of outboard and inboard propellers, Jet ski impellers and outboard parts.

Based on 20 years experience of manufacturing and supplying outboard and inboard propellers,
Captain Propeller targets in high-end market by supplying top quality and service you can experience from China.
We produce propellers that matched perfectly with outboards of Yamaha, Mercury,Suzuki,Honda,Tohatsu,Evinrude&Johnson and other famous brands in the world.

Besides the standard models from our production line, we also welcome custom design and OEM manufacture.

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