The guide

Haswing offers more than 30 electric outboard models — tiller-controlled, remote-controlled, transom or bow mount, in 12V, 24V and 48V versions. Choosing the right motor means working through a short list of criteria in order of importance.

Hull width matters more than length, since it drives water resistance directly — each model's spec sheet states the maximum hull width it is rated for. For hulls 170cm wide and up, a 24V motor is recommended instead of sizing from the thrust table below.

Electric motors are not recommended for rivers with strong current; if used there anyway, add 10lbs to the table values below for calm current and up to 30lbs for stronger current. For inflatable pontoons, add at least 10lbs versus the equivalent boat of the same length, since a pontoon creates more water resistance — a 4m boat needs a 40lbs motor, a 4m pontoon needs 50–55lbs.

The key brand criteria are spare-parts availability and in-country warranty service. Before buying, check the manufacturer's track record, model range and actual warranty terms — an attractively cheap motor from an unknown source often causes problems later.

MARKOR, the exclusive Haswing importer in Poland, advises on model selection. Treat online forums and groups with some caution — expert knowledge circulates there alongside plenty of inaccurate or outright absurd claims.

A maximizer is a stepless speed control — comparable to a motorcycle throttle. Unlike a plain gear switch, it lets you dial in any intermediate speed (e.g. between gear 2's 2km/h and gear 3's 3.5km/h), which matters for trolling, where precise speed matching counts.

Manufacturer testing shows a real current saving at partial power: a 55lbs motor (3.2m/1.1m boat) on a 5/3 gear switch at gear 3 reaches 3.2km/h drawing about 22A, while the same motor with a maximizer draws about 7A at the same speed. The difference disappears at full power, where both draw identical current.

A gear switch works across a fixed number of steps — typically 5 forward gears and 3 reverse. Each click of the tiller moves it one gear.

Usage rule: shift up gear by gear, waiting about 3 seconds between steps for the motor to reach the target RPM — never jump straight from gear 1 to gear 5, as it wears the switch out faster. Shifting down can skip intermediate steps, including going straight to “0”.

LBS (pounds) is a unit of thrust, not mechanical power. The HP/KM figures sometimes used in electric motor descriptions are marketing labels with no direct correlation to actual power output.

Conversion: 1 KM = 735 W, 1 HP = 746 W, 1000 W = 1.3596 KM = 1.341 HP.

Comparisons with combustion engines refer to thrust, not power — a 160lbs electric motor is sometimes likened to a 6HP outboard. Comparing raw power between combustion and electric motors misses the point, since electric motors are engineered around thrust, not peak power.

Manufacturer specs state maximum current draw (A) at full RPM — across the Haswing range this runs from a few amps up to 125A depending on the model. Control type (gear switch vs. maximizer) also affects draw. Rated figures assume maximum load; real-world draw usually runs a few amps lower.

Current draw does not scale linearly with speed. A Protruar 1.0 (45A draw) pushes a 4m/1.2m boat to about 6km/h, while a Protruar 5.0 (100A draw, needs two batteries) pushes the same boat to about 7–8km/h — a small speed gain for a much larger current draw. Even so, a 160lbs motor is fully justified on larger boats (6–7m).

Electric motors are built for thrust, not speed — extra power does not translate proportionally into extra speed. Haswing motors reach roughly 4–15 km/h depending on the setup.

Example: a 4m/1.4m boat with a Protruar 5.0 (24V/160lbs) tops out around 8km/h — the same motor reaches the same top speed on a 6m boat of the same width, because width, not length, determines water resistance.

A gear-switch motor is enough for simple point-to-point travel. For recreational boating and trolling, a maximizer-equipped motor works better and is also gentler on battery life.

A practical question to guide the choice: will the motor see 3 outings a year, or 30?

Sizing rule: motor's maximum current draw + 10A = fuse rating. Example: a 55lbs motor (55A max draw) needs a 60A fuse. Both blade-type and automatic (resettable) fuses are available.

Some models also have built-in overcurrent/overvoltage protection that cuts power automatically.

Every motor ships with a step-by-step mounting guide. Never force-tighten the motor onto the transom — it risks damaging the mount.

Correct propeller depth is essential — the propeller should never run partially above the waterline.

Shaft lengths range from 54cm to 210cm across the range. Each motor's spec sheet states exact dimensions and/or effective immersion depth.

Recommended approach: measure the distance from the transom or bow down to the waterline and compare it against the model's spec. Most Haswing motors offer height adjustment along the full shaft length, which makes fitting easier.

Answers to the questions most often asked about Cayman motors controlled via wireless remote and the Cayman GPS app.

Batteries differ in service life, ranked lowest to highest: flooded lead-acid → AGM → gel → AGM deep cycle → gel deep cycle → lithium. So-called “gel batteries” are lead-acid batteries with a gel electrolyte, offering higher voltage and longer life than a plain flooded battery. The market has clearly been shifting toward lithium over the past two years.

Gel and AGM batteries should be fully recharged immediately after every use, regardless of how long the motor ran. The 12V working range is 10.5–13V — never discharge below 10.5V; for maximum service life, stop at 11–11.5V (about 50% capacity). Leaving a battery uncharged causes sulfation, and running it flat until the motor stops pulling is especially damaging.

Lithium batteries (Li-ion, LiFePO4, Li-ion NMC) differ in working voltage range, dimensions, weight and cycle life. Based on MARKOR's experience, they last at least twice as long as gel batteries, deliver roughly 30% more usable energy at the same rated capacity, and can weigh up to five times less. Unlike gel/AGM, they do not need immediate recharging after use if not fully discharged. The recommended battery type is always listed in the motor's technical specification.

A simple rule sizes the battery: the motor's maximum current draw (A) × 2 = battery capacity (Ah).

Undersizing the battery relative to the motor is not recommended (e.g. an Osapian 55 paired with a 50Ah battery) — the higher relative load wears the battery out faster and shortens its service life.

For example, a Protruar 1.0 (about 50A max draw) on a 100Ah gel battery runs for about 1.5h at full throttle — runtime increases substantially at reduced power (a few hours at 2–3km/h). Models such as the Ultima or Protruar 55/Genius let you throttle back motor power, saving the battery further.

Gel/AGM batteries are rated at 20°C. Available capacity drops with temperature: to about 85% at 0°C, about 75% at −10°C, and about 65% at −20°C. At higher temperatures, service life drops instead — by half for every +10°C above the rated temperature: about 50% of design life remains at 30°C, and only about 25% at 40°C.

Recommended connection method: fit the motor cable's ring terminal onto the battery post, then a flat washer, a spring washer, and tighten with a nut — not too hard, to avoid stripping the thread; the terminal should sit firmly with no play, without damaging the thread. Wing nuts make tightening easier. Avoid alligator-clip style connectors seen on other brands — their point contact overheats posts and cables at 40A+ draw, causing power loss and harming the battery.

A 24V series connection is made by joining the positive terminal of one 12V battery to the negative terminal of the other — the voltages add up to 2×12V = 24V. The motor connects to the two remaining free terminals. The connecting link should be as short as possible and at least as thick as the motor cables, ideally thicker. Only connect batteries of the same type, capacity and series — ideally from the same purchase; never mix batteries of different capacity or wear level. Charging the batteries separately from time to time is recommended (chargers supporting both 12V and 24V are available). Every 24V motor ships with a connector for linking batteries. An all-in-one 24V lithium battery (Li-ion 7S or LiFePO4 8S) is an alternative.

A parallel connection increases capacity instead: positive to positive, negative to negative, giving e.g. 2×100Ah/12V = 200Ah/12V. The motor connects to the positive terminal of the first battery and the negative terminal of the second. The same battery-matching rules apply (type/capacity/series/age) — this wiring also discharges both batteries evenly, extending the set's service life.

Two mounting brackets are available for Cayman motors, sold separately — they are not included with the motor.