OEM Mercury Marine Spitfire 4-Blade Aluminum Prop 14 x 21 Propeller 48-8M0084496


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  • Improved performance for mid-range outboards
  • Delivers 16-25% faster acceleration than three-blade props to get on plane faster
  • Added cup provides superior holding in turns and heavy seas
  • High rake blade design for higher speeds
  • Uses the Flo-Torq II Hub System to cushion and protect the engine drivetrain from most damage causing impacts.


Mercury Marine / Mercruiser

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Brand new, genuine Mercury Marine / Mercruiser Spitfire 4 Blade Prop 14x21 Propeller. This is a factory original equipment part, not aftermarket. Fits: 135-300HP 2-Stroke and 4?Stroke outboards and Alpha and Bravo I sterndrives.

Product details
  • Product Dimensions: 16.5 x 16.5 x 7.8 inches ; 1.6 ounces
  • Shipping Weight: 9.5 pounds (View shipping rates and policies)
  • California residents: Click here for Proposition 65 warning.

It goes without saying that this 4-bladed prop out-performed our old 3-bladed14x23P prop for hole shots and cruising speed, but we were amazed at how much QUIETER this prop ran compared to our old propeller. Our 19' bowrider use to plane in about 4 seconds; I'd say it's closer to 2.5 seconds now. It's also use to take about 6 seconds to hit 30mph, but yesterday it took just over 4 seconds.

WOT on our previous 3-bladed14x23P prop was (gps verified) 49mph at 4550 RPM (4800 rpm is optimal for my engine). With this 4-bladed14x21P we turned 50mph at 4950 rpm, which is the rev limit so that's as fast as we could go. If it weren't for the limiter I *think* it might have gotten to maybe 5100 or so, based on how much throttle I had left to play with. For us, 50 @ 4950 is perfect... we rarely fly around at top speed, usually we cruise between 30-40 mph and this prop was perfect for that.

Replaced 14.5x19 on 4.3 Merc on 195 Stingray. Live in high altitude, 6400ft. Hole shot improved significantly,40% faster, while cruising speed rpm were lovered by 200 rpm. Good gas savings. I lost WO speed by 6 mph which is a good trade off for me. Holds on plane in lover speed. Measurements done by GPS.

The 4 blade prop does seem to get me into plane faster and do better in turns. I have not compared a Mercury prop to another brand, and the one replaced the original 3 blade Black Max, but this is genuine Mercury and top quality.

Just as advertised. Excellent price for a premium product. Well packaged and delivered promptly.
I had no problems fitting this new prop to my ski boat and I don't know whether its true but I fell that the boat performs better.

It's a perfect pitch for 21' Chaparral H2O with 4.3 MPI Alpha Gen 2 1.65; however, I don't like how it sings at low RPM.

Was having an acceleration problem with my boat, swapped the prop out and now it gets up out of the water.

Quick hole shots and no loss on top end. Installed on a 2007 Tahoe Q4 FS

Unbelievable performance. Switched out my 3 blade Aluminum prop for this one.