Solas Amita 4 Aluminum 11.1x9 Propeller (4-Blade) for Mercury 25-70 HP

The Solas Amita 4 11.1x9 is a four-blade aluminum propeller designed for Mercury/Mariner outboards from 25 to 70 HP, targeting improved overall performance and handling. Adding a fourth blade changes the prop dynamics in ways that bring several key advantages: faster boat planing, better ability to hold plane at lower RPM, and more stable handling in turns and choppy water. For boat owners seeking a smoother experience and increased confidence at the helm, the Solas Amita 4 is an excellent upgrade from the standard 3-blade propellers.

With an 11.1″ diameter and 9″ pitch, this prop maintains strong acceleration along with a respectable top speed. The four blades provide roughly 25% more surface area than three blades, meaning the prop bites the water more effectively. In practice, this translates to less prop slip (especially noticeable during sharp turns or in rough conditions) and better stern lift, which keeps the boat on plane at lower speeds where a 3-blade might let it fall off plane. Your boat will require less throttle to stay on plane, which can improve fuel efficiency during cruising. Additionally, the 4-blade design often reduces vibration and prop harmonics, contributing to a quieter, smoother ride.

You’ll also notice improved performance in towing watersports or heavy loads – with this prop, the engine has more grip on the water, resulting in stronger acceleration to pull a skier up or get a tube out of the water faster. Despite the extra blade, the Solas Amita 4 is engineered to still maintain a decent top-end speed. In some cases, peak speed might drop by 1-2 knots compared to an equivalent 3-blade (due to the increased drag), but for most boaters this loss is minor given the gains in control and acceleration.

The build of the Solas Amita 4 11.1x9 is robust and reliable. The aluminum blades are cast with high precision and balance to eliminate excessive vibrations. Solas also applies a thick powder-coat finish that shields the prop from corrosion and phenomena like cavitation burn. Even with prolonged high-RPM use, the prop retains its structural integrity and protective coating. Installation is straightforward on Mercury’s 13-spline prop shafts – simply remove your old 3-blade prop and install the new Solas Amita 4 11.1x9 using the same hub system. No special adapters are needed, as the dimensions and hub pattern match OEM standards.

Recommended Uses and Applications:

• Excellent for boats ~16 – 20 ft with 50-70 HP engines used in watersports (such as pulling skiers or tubes) – the 4-blade prop provides stronger acceleration and keeps the boat stable during hard turns
• Recommended for heavier boats or small cabin cruisers in the 25-60 HP range, where the extra blade helps maintain plane at lower speeds and gives more confidence in handling through chop
• Suitable if you desire a smoother ride with less vibration – the Solas Amita 4 reduces cavitation and prop noise, resulting in a more comfortable experience for passengers
• A popular upgrade from a standard 3-blade prop – you get improvements in many aspects of performance without complex modifications, all while retaining the reliability and easy installation of an aluminum propeller