Turning Point Express Mach4 14x9 RH 4-Blade Stainless Prop

Turning Point's Express Mach4 is the 4-blade stainless workhorse a lot of us reach for when a boat needs more bite than a stock 3-blade gives it. This one is the 14 inch by 9 inch, right-hand version in stainless steel. Four blades, a 14 inch diameter, and a 9 inch pitch. It's built for outboards, and it's the prop you fit when you want a stronger hole shot, better grip through a hard turn, and a planing surface that holds heavier loads without blowing out.

So what does that fourth blade actually buy you? More blade area in the water. That translates to a quicker hole shot, cleaner tracking through a turn, and better stern lift on a loaded boat. If you run a bow-heavy rig, or you're always hauling a full livewell, gear, and a cooler, the extra blade helps you get up on plane and stay up at lower speed. The tradeoff is a mile or two of top end versus an aggressive 3-blade. For most cruising and fishing rigs, that's a trade worth making.

Stainless is the reason this prop lasts. Turning Point uses their TP17 stainless alloy, which is a lot stiffer than aluminum. Stiffer blades flex less under load, so more of your engine's power actually goes into thrust instead of bending the blade. It also shrugs off the kind of sandbar kiss or submerged-log tap that would fold an aluminum prop. If you take a real hit, get it checked and rebalanced, but stainless gives you a lot more margin before that ever happens.

Here's the one thing you have to get right before this prop turns a single revolution: the hub. Turning Point built the Express series around their MasterGuard interchangeable hub system, and the hub kit is sold separately. That's not us nickel-and-diming you. It's how the system works. The correct hub kit is matched to your specific engine's gearcase and spline count, and it's the piece that absorbs shift shock and impact so your lower unit doesn't. Check Turning Point's hub selection chart against your engine before you order, and add the matching kit. Run it without the right hub and you'll get vibration, slip, or worse.

This is a right-hand rotation prop, which is what the vast majority of single-outboard boats use. If you're running twins and you're replacing the counter-rotating side, you'll want the left-hand version instead so the two props cancel each other's steering torque. On a single engine, right-hand is almost always what you want. Not sure which way your prop spins? Watch it from behind in forward gear, or just match your current prop.

Swapping it on is straightforward once you've got the correct hub kit in hand. Slide the hub into the prop, thread it onto the shaft over the thrust washer, torque the nut to your engine maker's spec, and set the cotter pin or tab washer so it can't back off. Give the blades a quick look every time you're at the ramp. A dinged or gouged edge scrubs speed and can throw the prop out of balance, and stainless is easy enough to have reconditioned rather than replaced. Keep a spare prop and a basic prop wrench aboard and a bent blade on the water becomes a ten-minute fix instead of a ruined day.

Who's this for? Runabouts, center consoles, bay boats, and pontoons in the mid-size outboard range that want a stainless upgrade from a tired aluminum prop, or a fresh 4-blade for better all-around manners. The 14 by 9 is a middle-of-the-road pitch, good for boats that carry a load and value grip and acceleration over outright speed. Pick your pitch to keep the engine spinning inside its wide-open-throttle RPM range, add the correct hub kit, and this prop will change how your boat feels off the line. Any questions on sizing, give us a call. We rig these all the time.