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A “pancake motor” is an axial-flux electric motor: a compact, disc-shaped design. Its short axial length, low-speed torque and cooling characteristics may suit marine propulsion, and YASA says its modular motors can be configured for outboard use. That establishes a possible application—not proof that a mass-market axial-flux outboard is available, or that it will outperform other designs.
What is a pancake motor?
“Pancake” describes the motor’s shape. In an axial-flux motor, magnetic flux travels parallel to the motor shaft, allowing a broad, relatively thin disc-like layout. The term describes geometry, not a specific product or guaranteed performance level.
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YASA says its axial-flux motors are suited to pure-electric and hybrid marine propulsion. It identifies high torque at low speeds, compact dimensions and direct cooling as useful characteristics for propeller drives. Its marine applications page says the motors can be used with or without a gearbox and that stackable units can be configured for several drive layouts, including outboards. These are manufacturer application statements, not results from an independent comparative trial. YASA’s marine applications page says: “The stackable nature of the YASA motors enables modular solutions for Stern Drive, V Drive, Shaft Drive, Jet Drive & Outboard propulsion.”
What could axial-flux geometry offer on a boat?
Shorter packaging and modular layouts
A motor with a short axial dimension may help where installation length is constrained. YASA also describes stacking motors as a way to build modular propulsion solutions. Whether that makes a particular outboard smaller depends on the complete assembly—including housing, cooling, reduction gearing if used, steering and mounting—not just the motor’s shape.
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Torque at propeller speeds
YASA presents high torque at low speeds as useful for propeller drives. It says its motors may be used with or without a gearbox, but does not establish that every installation can eliminate a gearbox or that an axial-flux design produces more usable thrust than another motor. Motor torque, propeller choice and boat operating conditions all matter.
Cooling and weight
YASA calls its motors’ direct cooling an important marine attribute and notes that light weight can matter too. The company’s broader statement is that marine applications may place particular value on “the optimally short axial length, high torque at low speeds and very efficient direct cooling.” This is YASA’s characterization; the cited material does not provide a standardized, independent comparison of cooling performance or installed weight against other motor types.
How the concept compares with electric outboards on the market
Electric outboards already use different motor architectures and cover a range of power levels. These examples provide market context, not a like-for-like test of axial-flux propulsion.
| Product or example | What the manufacturer states | What that does—and does not—show |
|---|---|---|
| ePropulsion Navy | 3 kW and 6 kW variants; the manufacturer describes them as direct-drive outboards. The Navy page also describes hydrogeneration while sailing, subject to specific operating conditions. | Shows a current direct-drive outboard range; it is not an axial-flux comparison. ePropulsion Navy Series |
| ePropulsion X-Series | The manufacturer lists 12–40 kW models. Its product page claims 88.2% powertrain efficiency for the X40. | The 88.2% figure is ePropulsion’s stated X40 claim, not an independently verified cross-brand result. ePropulsion X-Series |
| Mercury Avator 20–35e | Mercury says these models use transverse-flux motor technology. | Illustrates another motor architecture. Mercury’s runtime and comparative performance figures rely on internal tests and specified boat, load, battery and environmental conditions; they should not be generalized to all boats. Mercury Avator |
| EVOA E1 and Chris-Craft Launch 25 GTe | YASA describes EVOA E1 as an integrated 800 V system using axial-flux motors and the Launch 25 GTe as an all-electric concept boat powered by that system. | Shows axial-flux technology in a marine system and concept-boat context; it does not establish a small, off-the-shelf axial-flux outboard. YASA on EVOA E1 |
| Magonis Wave e-550 package | Magonis describes a package with a 40 kW Flux Marine outboard and 28 kWh battery, claiming 25 knots and 29 nautical miles of range. | Those figures apply to the stated boat-and-package context and are manufacturer claims, not a general range or speed prediction for other boats. Magonis Wave e-550 |
ePropulsion’s 2026 specifications flyer lists nominal power of 12 kW for X12, 20 kW for X20 and 40 kW for X40. It also says its 48 V E Series LiFePO4 batteries are compatible with ePropulsion 48 V motors, including Navy. Check the exact motor model and voltage before selecting a battery; compatibility should not be inferred across brands or product families. ePropulsion 2026 specifications flyer
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Why motor design alone cannot predict boat performance
An outboard’s performance is a system result, not a motor-geometry result. The motor, propeller, battery, controls, hull, load and operating profile interact. A manufacturer’s range, runtime, speed or efficiency figure is meaningful only with its test conditions and configuration.
- Rated power: Compare the stated rating and the model it applies to, rather than treating every headline number as measured the same way.
- Mass and packaging: Consider the installed system and mounting arrangement, not the motor alone.
- Battery: Check voltage, capacity and model compatibility. Stored energy and power delivery are related but distinct requirements.
- Drive and propeller: Identify whether the motor is direct-drive or geared, and which propeller is specified. ePropulsion, for example, lists an optional propeller for Navy 6.0 testing.
- Thermal management: Understand how the system is cooled and what operating limits apply.
- Boat and mission: Hull shape, displacement, passengers or cargo, water conditions and desired cruising profile affect attainable speed and range.
- Test method: For efficiency or range comparisons, require the same measurement boundary and comparable boat, battery, load and conditions.
The available manufacturer material does not provide a standardized independent dataset comparing axial-flux outboards with direct-drive or transverse-flux alternatives. Consequently, it supports the case that axial-flux motors may suit marine installations, but not a general claim that they are more efficient, smaller or more powerful as complete outboard systems.
What would prove the “future outboard” claim?
A credible comparison would test complete, production-ready systems under matched conditions. It would identify rated power, installed mass and dimensions, battery voltage and usable energy, propeller and drive arrangement, cooling limits, boat and load, and the operating profile. Efficiency should be reported with a clear definition of what is measured and independently verified where possible.
Until such data and a clearly identified consumer product are available, treat “pancake-motored outboard” as a technically plausible application rather than a confirmed market category. Axial-flux design may help engineers package torque-dense propulsion in a compact space; the boat-level benefit remains specific to the finished system and its use.
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