Most customers asking us about Command Thrust have already read the Mercury brochure. What they actually need is a straight answer to one question: is this the right gearcase for MY boat, MY use case, and the loads I actually carry. The Mercury brochure will not tell you...
Quick answer: Mercury Command Thrust is a gearcase option (not a separate motor): larger housing, larger-diameter propeller options, lower gear ratio. Mercury describes it as helping heavy boats plane and remain there at lower speed. HBW's September 5, 2026 pricing reference includes specific 9.9 FourStroke and ProKicker CT configurations, plus 40, 50, 60, 90 and 115 FourStroke and 115 Pro XS CT configurations. Check the exact model code. Best fit is a hull/load/prop decision, commonly pontoons, heavy boats, kicker rigs, and commercial. FourStroke 75-150 · Pro XS 115-150.
Most customers asking us about Command Thrust have already read the Mercury brochure. What they actually need is a straight answer to one question: is this the right gearcase for MY boat, MY use case, and the loads I actually carry. The Mercury brochure will not tell you that. We will.
This guide explains the Command Thrust configurations identified in the current HBW pricing reference, the boat and load questions that affect fit, and what changes versus a standard gearcase. It is not an exhaustive factory lineup or a substitute for the exact engine specification. The practical question is whether the available CT configuration suits your boat, load and propeller. We do Command Thrust repowers at HBW every spring on Rice Lake and the Kawarthas, and the patterns are clearer than the forums make it sound.
What Mercury Command Thrust actually is
Command Thrust is not a separate motor family. The same Mercury FourStroke or Pro XS powerhead sits on top. The change is everything from the midsection down.
A Command Thrust gearcase has three engineered changes vs the standard gearcase:
- Larger gearcase housing. Taller and wider lower unit, with more displacement under the water. Acts as a bigger rudder for tighter low-speed control.
- Larger-diameter propeller options. Choose blade count, diameter, pitch, and hub for the exact engine and gearcase. Command Thrust does not make every four-blade prop compatible.
- Lower gear ratio (numerically higher). More torque multiplication at the prop. Faster acceleration with heavy loads, but lower top-end speed than the standard gearcase at the same RPM.
The three changes work together. You cannot get the benefit by swapping just the prop on a standard gearcase. You cannot get the benefit by swapping just the lower unit without the matched prop. Mercury sells Command Thrust as a complete factory configuration, and that is how the engineering works.
Interactive: Command Thrust vs standard gearcaseDrag the throttle, press E to open the cases, S to slow it down. Gear ratios from Mercury literature; tooth counts are illustrative.Mercury Marine's own gearcase comparison demo shows the size difference clearly. Worth a minute if you want to see the parts side by side before reading further:
What Command Thrust does (and does not do)
What it DOES do:
- Better hole shot under heavy load (faster time to plane)
- Stronger reverse thrust for getting off shallows and tight docks
- Tighter low-speed control thanks to the bigger gearcase acting as a rudder
- Planes at lower RPM, which can mean lower cruise fuel burn when fully loaded
- Better holds plane in turns and at slower speeds (less prop slip)
What it does NOT do:
- Does not add horsepower. A 90 HP Command Thrust makes the same peak HP as a 90 HP standard.
- Does not automatically raise or cut top speed by a fixed amount. Mercury's current material says Command Thrust can help heavy boats plane without treating top speed as a guaranteed trade. Any speed change is boat-, load-, and prop-specific.
- Does not work miracles on light boats. On a 14 ft tinny or a light cruising pontoon, the standard gearcase usually outperforms CT in top end and fuel.
- Does not retrofit easily. The gearcase, driveshaft, water pump, and prop are all different parts. Converting a non-CT motor to CT means swapping the entire lower unit, which is usually within striking distance of trading the entire motor.
That last point is the most common misconception at the shop. People with an existing standard-gearcase motor often ask if we can "add Command Thrust." The honest answer is rarely yes. Use the eligibility tables below for pontoon and hull fit; converting a non-CT motor usually means swapping the entire lower unit.
From BigFoot to Command Thrust: choosing for the boat
Back in the 1990s, pontoon boats were taking off, and they created a problem the outboard industry hadn't fully solved. A pontoon sits high on the water, doesn't plane like a V-hull, and carries big loads at modest speeds. A standard mid-range gearcase spinning a small prop just wasn't moving that kind of boat well.
Mercury's answer was BigFoot. Take a 40-60 HP powerhead and hang it over a much bigger gearcase, with a larger-diameter driveshaft and propshaft closer to what a 90 HP class motor carries. The bigger case swings a bigger, deeper prop through a taller gear ratio (2.33:1 vs 1.83:1 on the 60). The result is push power: the ability to move a heavy, high-sitting boat with authority at the speeds it actually runs.
Mercury's own literature at the time called BigFoot "the industry's only outboard engine made specifically for pontoons." That's the origin, from the horse's mouth: a pontoon and workboat motor. Around 2014, Mercury quietly renamed BigFoot to Command Thrust. New name, same idea.
In an HBW comparison on Rice Lake, a 16-foot Legend with a standard-gearcase Mercury 60 ran 6 mph faster than a 16-foot Legend with a Command Thrust 60. Jay Harris confirms that result, but the propeller details were not retained. It is a shop observation, not a controlled test isolating the gearcase or a promised speed difference for another boat.
On a planing V-hull, compare both gearcase options using the normal passenger and gear load. Propeller choice, mounting height, acceleration, ability to hold plane and cruising efficiency all matter alongside top speed.
Mercury describes Command Thrust as a way to help heavier boats plane and stay on plane at lower speeds. It does not give every boat a fixed top-speed penalty. Ask your dealer why the proposed engine, gearcase and propeller suit your hull, and what comparable test data support the recommendation.
Quick eligibility check
Different hulls, different answers. The honest matrix:
| Boat type |
Command Thrust eligible? |
Why |
| Pontoon (any size, 20+ ft twin tube) |
Yes, strong fit |
Heavy load, want hole shot |
| Tritoon (any HP class) |
Yes, almost always |
Third tube adds weight + drag |
| Aluminum deep-V fishing boat |
Hull/load/prop choice; HBW often prefers standard |
Shop recommendation for the planing V-hulls we see, not a universal exclusion |
| Fiberglass bass boat |
Hull/load/prop choice; HBW often prefers standard |
Mercury offers CT on 115 Pro XS; we still quote standard unless the boat, load, and test say otherwise |
| Center console (V-hull) |
Hull/load/prop choice; HBW often prefers standard |
Confirm the exact engine, gearcase, and prop rather than excluding every V-hull |
| Commercial workboat / charter / water taxi |
Yes |
Mercury SeaPro CT exists for this exact use case |
| Kicker motor (trolling) |
Yes on specific ProKicker CT SKUs |
Confirm the current 9.9, 15, or 25 model code; charging output is model-specific |
| Light 14-16 ft cruising boat |
No, save the money |
Standard gearcase is faster and lighter |
| Trolling-only fishing pontoon |
No, save the money |
Standard fine at trolling speeds |
| 18-20 ft twin tube pontoon (moderate use) |
Probably yes |
Classic sweet spot |
Is your pontoon eligible?
| Pontoon category |
Command Thrust eligible? |
Notes |
| 20+ foot pontoon, twin tube (heavy load use) |
Yes, strong fit |
Heavy boats benefit most from CT thrust |
| Tritoon (any size, 17 ft and up) |
Yes, almost always |
Tritoons carry more weight and want CT |
| 18 to 20 foot twin tube, moderate use |
Yes, recommended |
The classic Command Thrust sweet spot |
| 16 to 18 foot twin tube, cruising only |
Probably overkill |
Standard gearcase usually fine for light loads |
| Heavy work pontoon (cottage hauling) |
Yes |
Load capacity matters more than length here |
| Water-sports pontoon (skiing, tubing) |
Yes |
Pulling power is the whole reason CT exists |
| Pontoon used for trolling fishing only |
No, save the money |
Trolling speeds don't need CT thrust |
| Aluminum V-hull boat |
Boat-specific |
HBW often prefers standard on planing V-hulls; label that as a shop recommendation and check the actual hull |
Which pontoons are eligible
The simplest rule: if your loaded pontoon weight (boat + people + gear + fuel) is over about 1,361 kg (3,000 lb), Command Thrust earns its keep. If it's under 907 kg (2,000 lb) loaded, save the money. The middle is where the use case decides.
The four eligibility scenarios worth knowing.
Tritoons of any length
A tritoon adds a third center tube. That third tube means more carrying capacity, more freeboard, and more displacement when loaded. Tritoons almost always benefit from Command Thrust, even on smaller 18 or 20 foot models. The third tube creates more drag at displacement speeds, and CT's stronger low-end thrust overcomes that drag much more cleanly.
If you have or are buying a tritoon, plan for Command Thrust unless your dealer talks you out of it for a specific reason.
20-foot and larger twin tube pontoons
Once a twin tube pontoon hits 20 feet, the loaded weight is typically 1,134 kg (2,500 lb) or more. At those weights, Command Thrust noticeably reduces time-to-cruise and lets you carry a full load without feeling underpowered. The 20-22 foot twin tube pontoon is the classic Command Thrust application.
Pontoons used for water sports
Water sports (tubing, light skiing, wakeboarding on bigger pontoons) demand torque at low speeds, exactly what Command Thrust delivers. A pontoon that struggles to come up on cruise with a tube behind it is almost always a hole-shot problem, not a horsepower problem. CT fixes hole shot directly.
Cottage-country work pontoons
If you use the pontoon to haul building materials, cottage supplies, or do anything that puts heavy weight on the boat regularly, Command Thrust is the right call. The reverse thrust is also useful in getting off shallow shorelines and around docks.
Which pontoons are NOT eligible (or shouldn't bother)
Just as important: when standard gearcase is the right answer.
16 to 18 foot light cruising pontoons
A two-tube 16 or 18 footer used for casual cruising at moderate loads often does not gain much from Command Thrust. The standard gearcase usually comes up on cruise easily. Do not treat a 2 to 4 MPH top-speed bonus as a product fact; compare the actual hull, load, and prop. Unless you're hauling 8 people regularly on a small pontoon, save the money.
Trolling-only fishing pontoons
If you trolling motor fish at 3 to 5 MPH all day, you're never using the thrust Command Thrust is engineered for. Standard gearcase is the right call. The bigger CT prop drags more at displacement speeds and slightly hurts fuel economy at trolling speeds.
Light loads / small families
Two people, lightweight gear, mostly day cruising at 25 MPH. Standard gearcase. Save the money for upgraded seating or a better stereo.
Already over-powered
Some pontoons are already running close to capacity-plate maximum HP. Adding Command Thrust to a motor that's already pushing your hull near its limit doesn't get you more performance; you're just changing the gearing.
How to check your specific eligibility
Five things to confirm before you commit.
- Pontoon length. Measured at the deck, not the tube ends. Round to the nearest foot.
- Tube count. Two tubes or three (tritoon). The third tube is a major eligibility factor.
- Loaded weight estimate. Boat dry weight (in your owner's manual or on the capacity plate) plus typical people and gear. Be honest about what you actually carry.
- Transom height. Command Thrust gearcases run a few inches taller than standard. Most modern pontoons handle this fine but it's worth measuring.
- Current motor HP and serial number. This tells us which Command Thrust options are available at that HP class and if you're at capacity-plate maximum.
For the long version of motor serial number decoding, our Mercury Outboard Serial Number Guide walks through year and model decoding.
HP class availability
As of September 5, 2026, the HBW pricing reference lists CT configurations in the 9.9, 40, 50, 60, 90 and 115 HP classes, including the 115 Pro XS. These are examples from HBW's published catalog, not an exhaustive factory lineup. Shaft length, controls and gearcase must be checked together for the exact model.
Rather than list every model and year here (Mercury changes things), check Mercury's official Command Thrust overview at mercurymarine.com/en/us/outboards/fourstroke/command-thrust.
The full Mercury Command Thrust lineup
Mercury FourStroke Command Thrust models
| HP class |
Configuration |
Primary application |
| 9.9 FourStroke CT |
MLH / ELH / EXLH |
Listed CT configurations outside the ProKicker range |
| 9.9 ProKicker CT |
ELHPT / ELPT / EXLHPT / EXLPT |
Kicker configurations; choose shaft and controls for the boat |
| 15 and 25 ProKicker |
Confirm exact model |
The ProKicker name alone does not establish Command Thrust fitment; check the Mercury specification for that model |
| 40 FourStroke CT |
ELPT / ELHPT |
Heavier 16-18 ft aluminums, smaller pontoons |
| 50 FourStroke CT |
ELPT / ELHPT |
Pontoons 16-20 ft, heavier aluminums |
| 60 FourStroke CT |
ELPT / ELHPT / EXLPT |
Classic pontoon mid-range |
| Other ratings and configurations |
Confirm exact model |
Use the current model listing and Mercury specification; do not choose a different horsepower just to obtain CT |
| 90 FourStroke CT |
ELPT / EXLPT |
The pontoon workhorse |
| 115 FourStroke CT |
ELPT / EXLPT |
20-22 ft pontoon + tritoon |
(ELPT = Electric start, Long shaft, Power tilt and trim. EXLPT = same with eXtra-long shaft. ELHPT = Electric start, Long shaft, Hand tiller, Power tilt and trim. Specific availability shifts by model year.)
Mercury Pro XS Command Thrust
The HBW pricing reference lists a 115 ELPT Pro XS Command Thrust configuration. Compare that exact model with the standard-gearcase alternative; do not infer gearcase options from the Pro XS name or horsepower alone. HBW's shop recommendation for most planing V-hull bass and angler boats is still the standard gearcase. That is a boat-specific recommendation, not a universal V-hull exclusion.
Mercury SeaPro Command Thrust
SeaPro is Mercury's commercial line. SeaPro CT exists for charter boats, water taxis, government workboats, and anyone running daily hours with heavy load. SeaPro motors have longer maintenance intervals and reinforced internals vs the recreational line. CT is standard or optional depending on HP.
For the official Mercury Marine Command Thrust overview, see mercurymarine.com/en/us/outboards/fourstroke/command-thrust.
Application-by-application guide
Pontoons (the biggest CT use case)
Pontoons are where Command Thrust earns its reputation. The combination of heavy displacement, flat draft, and family-loaded weight (8 people, coolers, water toys, cottage gear) is exactly what CT was engineered for.
- 20+ ft twin tube pontoon: plan on CT unless the boat is rarely loaded.
- Tritoon any HP: plan on CT. The third tube means more drag and CT's thrust overcomes it cleanly.
- 16-18 ft cruising pontoon: standard gearcase usually wins. CT gives up top speed without the load benefit kicking in.
The pontoon eligibility table above is the fit check for this page.
Aluminum deep-V fishing boats
Big Lund, Princecraft, StarCraft, and similar. Command Thrust is a hull, load, and propeller choice. HBW's shop recommendation on most planing V-hull fishing boats is the standard gearcase, including when the boat is loaded with anglers, gear, livewell, and full fuel. If another shop specs CT for "more torque," ask for the actual boat, prop, and test result rather than a universal speed deduction.
- Standard gearcase across the 14-19 ft range, solo or crewed.
- If you want more low-speed thrust for trolling, add a 9.9 or 15 HP ProKicker (the ProKicker CT gearcase is a legitimate trolling-motor configuration).
Fiberglass center consoles + offshore
Center console V-hulls are usually planing boats. HBW's shop recommendation is still the standard gearcase unless the exact hull, load, and prop argue otherwise. Full bait wells and 4-5 anglers do not create a universal CT exclusion or a universal speed penalty. Match HP to the hull's capacity plate and quote the actual gearcase.
Kicker motors (the ProKicker CT story)
Current Canadian ProKicker listings include 9.9, 15 and 25 HP. HBW's September 5 reference explicitly names 9.9 ProKicker CT configurations. The ProKicker badge by itself does not establish CT fitment on another rating; check the exact Mercury model specification. Charging output is also model-specific: Mercury Canada's 15 ProKicker specification lists 12 amp / 145 watt rated output, and Mercury's 25/30 platform introduction describes 17-amp output. Those are rated maximum figures, not available charging current at trolling RPM. Do not treat a kicker as a guarantee that a trolling battery will recharge without the correct charging arrangement and a load calculation. ProKicker 9.9-25.
Questions to work through with your dealer:
- 9.9 HP ProKicker, often with CT, on a bass or walleye boat as trolling backup.
- 15 HP ProKicker when the heavier aluminum or fiberglass rig needs more thrust and the exact model supports it.
- 25 HP ProKicker only after checking weight, shaft length, mounting clearance, controls, and thrust. Do not treat 25 as an automatic substitute for every larger boat.
Commercial / SeaPro applications
Charter fishing boats, water taxis, marine police, and government workboats running daily hours. SeaPro CT is engineered for the duty cycle. If you are running 1,000+ hours a year, the SeaPro premium pays back in maintenance interval and longevity. Not a recreational decision.
Command Thrust Prop Selection
A Command Thrust gearcase requires Command Thrust props. The larger diameter, different geometry, and different hub design mean standard props will not fit or perform correctly. CT props typically run larger diameter than standard, use a lower pitch range optimized for hole shot and load handling, lean on 4-blade designs for hole shot and smoother trolling, and come in aluminum or stainless depending on HP class and use. For pontoons, a 4-blade aluminum is the common starting point. Final prop selection depends on the hull, load, motor, and safe seasonal testing.
How to know if Command Thrust is right for YOUR boat
Five things to check before you commit. The same five we ask every customer who emails or calls us asking the CT question.
- Boat type and loaded weight. Honest answer about what you actually carry on a typical trip, not the boat's dry weight on the brochure.
- Capacity-plate maximum HP. Adding CT does not let you exceed capacity. We see customers wanting CT on a hull that is already at max HP and that is not the lever they think it is.
- Use case (fishing? cruising? water sports? cottage hauling?). Each shifts the answer.
- Boat geometry (transom height, tube count for pontoons). Some older transoms do not accommodate the taller CT lower unit. Worth measuring before ordering.
- Existing motor's age + hours. Decides whether retrofit-thinking is realistic vs full repower.
For motor serial number decoding, our Mercury Outboard Serial Number Guide walks through year and model identification.
What we see at HBW
We have quoted hundreds of Command Thrust repowers since the option came on the Mercury lineup. A few patterns hold up year after year on Rice Lake and the Kawarthas.
The first pattern: customers who try Command Thrust on a heavy pontoon almost never go back to standard. The hole shot improvement under load is not subtle. You feel it the first time you punch the throttle with the family aboard. Standard gearcase customers on the same pontoon do not have a frame of reference, so they assume the boat is just slow. CT customers know.
The second pattern: the regret stories are almost always light pontoons or small aluminums where the owner insisted on CT despite our pushback. We see them three years later trading down to standard gearcase, complaining about top speed. The honest conversation at the shop on the front end can save real money and a year of frustration.
The third pattern, specific to Rice Lake and the Kawartha Lakes: late-season shallow water. The back bays of Rice Lake and the lakes around Bobcaygeon and Lakefield drop several inches in August and September. Pontoons that floated fine in June can be touching bottom on the way out of the cottage in September. CT's stronger reverse thrust pays off here. Customers who learned the hard way by dragging tubes through soft mud are some of our most loyal CT advocates.
Fourth pattern: ProKicker CT on offshore rigs is underrated. Customers running deep-V fiberglass on Lake Ontario or Lake Simcoe with a 9.9 or 15 ProKicker often get a better trolling experience. Charging still depends on the exact model's rated output and the load at trolling RPM; it is not a 60-amp system and it does not automatically replenish a trolling battery.
Fifth pattern: tritoons with standard gearcase almost always disappoint. The third tube is the dead giveaway that the boat is going to want more thrust. If somebody calls us about a tritoon that "feels underpowered," 9 times out of 10 they are on a standard gearcase. Repowering with CT solves it without bumping HP class.
Why Command Thrust matters for Ontario boaters
Pontoon population is high in the Kawarthas. Rice Lake, Lake Scugog, Pigeon Lake, Stoney Lake, Lake Simcoe, Lake Couchiching, and the Trent-Severn all see heavy pontoon traffic. The use case skews toward loaded family days, fishing parties, and shoreline navigation. That use case favours Command Thrust strongly.
Late-season water levels. Ontario's lakes and rivers drop in late summer and fall. Stronger reverse and slow-speed control matter for navigating shallow shorelines, lock approaches, and cottage docks in October.
Cottage hauling. Many Ontario pontoon owners use the boat to move building materials, propane tanks, generators, and supplies to cottage properties. CT's pushing power matters here more than top speed.
Multi-engine rigs are less common. Most Ontario rigs run a single outboard. The CT decision is generally about a single main motor (or main + kicker). Twin-engine setups exist on bigger lake boats but most CT conversations at HBW are single-motor repowers.
Trolling culture is strong. Lake Simcoe, the Bay of Quinte, and Lake Ontario have deep trolling cultures for trout, salmon, and walleye. ProKicker CT (9.9 or 15) on a bigger main rig is a common HBW spec.
Common mistakes (the things we push back on)
The CT conversation goes wrong in predictable ways. The four we see most often:
Ready to talk Command Thrust for your boat?
Quote a CT repower: mercuryrepower.ca
Harris Boat Works · 5369 Harris Boat Works Rd, Gores Landing, ON · Mercury Marine dealer since 1965, current Premier Dealer.
