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Choosing an Aluminum Propeller or Stainless Steel Propeller

 

The two most common materials for boat propellers for outboard and stern drive boats are aluminum and stainless steel.  Each material has some specific advantages you should consider when choosing a material for your new propeller

 

 

Aluminum Propellers

 

 

Benefits:

• Aluminum propellers are the least expensive option
• Aluminum propellers will offer good performance under many circumstances
• Aluminum propellers weigh about half as much as the same propeller in stainless steel
• Dings and nicks in aluminum propellers can be more easily fixed

Challenges:

• Under high rpms, aluminum propellers can flex, effectively dropping the pitch (although this is much less likely in new propellers that use thicker material)
• Aluminum prop blades are thicker than equivalent stainless steel blades, creating more drag
• Aluminum propellers wear badly in sandy conditions
• Aluminum propellers are more prone to damage from minor impacts

 

Stainless Steel Propellers

Benefits:

• Stainless steel propellers offer higher performance by using thinner blades that will not flex under load
• Stainless steel propellers are available in a wider range of propeller designs, for heavy loads and high performance applications
• Stainless propellers are more durable in abrasive environments like sand flats or shallow, sandy rivers
• Stainless steel propellers are much harder than aluminum and do not typically sustain as much damage in a minor strike

Challenges:

• Stainless steel propellers are more expensive than equivalent aluminum propellers
• Stainless steel propellers weigh nearly two times what an equivalent aluminum propeller does
• Heavier stainless steel propellers take more effort to get spinning
• Stainless propeller options may be limited for smaller outboards

Which propeller material is right for you?  If your use is light and your demands reasonable, then an aluminum propeller may be a great solution for you.  If you are running a more powerful engine and performance is an issue, a stainless steel propeller will better meet your needs.  Investing in a stainless steel propeller can cost more up front, but may be a better value over the long haul if you have to replace aluminum propellers frequently due to damage or wear.

 

 

http://www.savvyboater.com/Choosing-an-Aluminum-Propeller-or-Stainless-Steel-Propeller.aspx