Transporting an outboard motor (outboard motor) without specialized equipment often turns into a marathon for the back and nervous system. A heavy unit weighing 30-50 kilograms, which can not be grasped at a single point without the risk of dropping, requires a competent approach. That is why the outboard motor trolley becomes not just a convenient option, but a vital accessory for every aqueous motorist who values his health and safety of equipment.
The modern market offers off-the-shelf solutions, but the cost is often unnecessarily high, and the design may not take into account the individual specifications of your boat or the type of storage. Many owners of PLMs come to the idea of self-manufacture such a device, which allows you to create a perfect tool for specific tasks. In this article, we will discuss in detail the design features, the choice of materials and the step-by-step process of creating a reliable vehicle for your motor.
Design features and types of trolleys
Before you take on a welding machine or saw on metal, you need to clearly understand what types of structures exist and which one is right for you. Motor cart It's not just a wheel frame, it's a complex engineering solution that allows the load to be stable when it's moving through rough terrain, and the main purpose of the device is to move the center of gravity as low as possible and to ensure that the engine is firmly fixed in a vertical or slightly tilted position.
There are two basic design approaches: vertical carts and horizontal engine carts. Vertical models are more compact in terms of space in the garage, but they require very reliable fixation so that the engine does not collapse when a sharp turn. Horizontal options are often used for storing and transporting heavy engines, where it is important to distribute the load on the frame evenly, but they take up more space.
The key element of any design is cross-board It's a model of a motor that's attached to a lower unit, and it's the unit that takes the bulk of the weight and the vibrations that you're transporting, and it's important that the fasteners, the bolts, the rods, match the seating position of your particular motor, whether it's your motor. Yamaha, Mercury or TohatsuUniversality here often plays a cruel joke, leading to backlashes and damage to the fasteners during prolonged use.
Special attention should be paid to the wheelbase. Wide wheels with pneumatic tires will provide better cross-country performance on sand and soft ground, typical for many recreational centers. Narrow cast wheels are suitable exclusively for moving on hard asphalt or concrete floor of the workshop. The choice of chassis type directly affects the maneuverability and effort that you will have to apply when rolling the cargo.
The optimal design of the trolley should presm_modules: adjustable height of the engine installation and wide pneumatic wheels for cross-country.
Required materials and tools
The quality of the final product depends on the materials chosen. To save on metal for the frame is to risk the integrity of an expensive engine. For the main supporting frame, the best fit is a profile pipe with a square or rectangular cross-section. The optimal choice will be a pipe size of 40 x 40 mm or 50 x 25 mm with a wall of at least 2-3 mm. profile provides the necessary rigidity for twisting and bending, while remaining light enough.
Crossbars and mounting elements can be used with a 40x40 mm or 50x50 mm angle. If you plan to make a trolley foldable or collapsible, you will need thicker metal and high-quality bolt joints. Aluminum alloys are also applicable, especially if maximum lightness of construction is important, but they require specific welding skills (argon) and they are less resistant to impact loads than steel.
The list of necessary tools and components is as follows:
- 🛠️ Profile pipe and corner (steel St3 or analogues) for the frame.
- 🔩 Fixing elements: bolts of strength class not lower than 8.8, nuts with growers or self-contradicting nuts.
- 🎨 Anti-corrosion coating: primer for rust and enamel for outdoor work or powder painting.
- ⚙️ Wheel pair: finished bogie wheels with bearing units or axles with pressed bearings.
Do not forget about consumables for welding and cutting. Electrodes must correspond to the thickness of the metal, and discs for the angle grinding machine (Bulgar) must be of high quality to avoid the spread of abrasive. To connect the moving parts, loops or special hinges may be required, which also must be made of durable metal.
Use galvanized fasteners or stainless steel for all bolt joints, as the trolley will be in constant contact with moisture and salt.
Step-by-step instructions for assembling the trolley
The fabrication process starts with a drawing or even a detailed sizing sketch. Without planning, you run the risk of redesigning the structure several times. You can determine your engine size, your lower unit height, and the distance from the lower unit to the mounting holes on the transom, and you can calculate the height of the vertical rack and the crossbar position.
The first step is to cut the workpieces according to the drawing. All cuts must be made at a 90 degree angle, unless otherwise provided to ensure that the joints fit tightly during welding. Then the main frame is assembled. First, the angular joints are grabbed, the geometry is checked (the diagonals must be equal), and only after that the seams are fully welded. Welded seams You need to clean with a grinder to remove the slag and ensure a flat surface.
Then you have a vertical strut and a crossbar to hold the motor, and it's critical to have perpendicularity, and if the motor is at an angle, the center of gravity will shift, and the cart will be hard to roll, and you can weld a piece of moisture-resistant plywood board to hold the motor, or you can use a rubber-plate to avoid scratching lower unit, and the bolt holes must match the seats on your engine's lower unit.
The final assembly step is to install the wheel axle and handles to move around, and it is better to weld the axle with reinforcing headscarves, as this place experiences maximum loads, and the push handle can be made from the same profile pipe, providing the possibility of removing it or folding it for compact storage.
☑️ Control of trolley assembly
Installation of wheelbase and running gear
The chassis is the element that most often fails when loading is not calculated correctly. When choosing wheels, you should consider not only the diameter, but also the load capacity. For heavy four-stroke motors, the total load on the axle can exceed 60-70 kg, so the wheels should have a margin of safety. It is recommended to use wheels with a diameter of at least 300 mm for better terrain.
There are several options for mounting wheels. The easiest way is to weld a larger diameter pipe segment into which the axle is inserted. However, the more reliable option is to use pre-made bogie assemblies with rolling bearings. These assemblies provide smooth running and do not require frequent lubrication. If you use a homemade axle (a steel rod with a diameter of 20-25 mm), be sure to provide spaces for locking rings or nuts to prevent the wheel from slipping during the movement.
⚠️ Attention! When welding axles or wheel attachment knots, make sure that the metal does not overheat and lose its strength. Use a intermittent seam and let the metal cool down to avoid deformation of the frame.
To improve comfort, the trolley can be equipped with shock absorbers. Simple rubber gaskets between the frame and the axle or the use of low-pressure pneumatic wheels will significantly reduce vibration transmitted to the engine, this is especially important when transported on pavers or uneven ground, where shaking can damage the internal mechanisms of the motor.
Corrosion protection and finishing
Given that the trolley will be operated in an aggressive environment (water, salt, sun, temperature changes), the issue of corrosion protection is acute. Conventional oil paint will quickly peel off, leaving the metal unprotected. The optimal solution is to use specialized rust primers that convert oxides and create a solid basis for the finishing coating.
The painting process has to take place in several stages. First, the surface is degreased with solvent. Then the soil is applied, preferably in two layers, with an intermediate drying. The finishing is better chosen in bright colors (yellow, orange, bright blue), so that the trolley is clearly visible on the shore and in the water, which increases safety. The alternative to painting is hot galvanizing, but this is an expensive procedure that is not available in every city.
Pay special attention to the welds and the inner cavities of profile pipes. Inside the pipes you can pour anticorrosion compound (for example, "Moville" or analogues), pre-clogging the holes with plugs, this will prevent the rotting of the metal from the inside, where moisture often enters through capillaries and condensate.
To protect the engine from scratching the metal cross of the cart, use rubber linings or paste contact surfaces with car antigrave. This is a cheap and effective way to preserve the product appearance of the engine and prevent corrosion on its body in areas of paint damage.
Table of compatibility and specifications
To simplify the choice of parameters for the future trolley, the following table with indicative specifications depending on the power and weight of the engine will help determine the desired metal thickness and wheel size.
| Motor category | Motor weight (kg) | Recommended frame profile | Wheel diameter (mm) | Axle load capacity (kg) |
|---|---|---|---|---|
| Low power (2-6 hp) | 25 | 30x30x2 mm | 200-250 | 50 |
| Average power (8-15 hp) | 25-45 | 40x40x2 mm | 260-300 | 80 |
| High power (20-30 hp) | 45-80 | 50x50x3 mm | 300-350 | 120 |
| Powerful four-stroke (40+ hp) | 80+ | 60x40x3 mm | 350-400 | 150 |
Nuances for four-stroke engines
When transporting four-stroke motors on a trolley, the design of the trolley should allow the motor to be fixed strictly vertically.
Operation and security measures
Proper operation of the trolley will prolong its life and protect you from injury. Before each trip, conduct a visual inspection of fasteners. Vibration when moving through irregularities can unwind even well-tightened nuts. Use thread locks or regularly tighten connections.
When you move the motor on inclined surfaces (descent to water), always stand above the trolley and hold it, controlling speed. Instinctively trying to brake the falling trolley with your hands, you can get serious injury to your fingers or back. If the descent is steep, you better use additional brake stops or help from a partner.
⚠️ Attention! Never leave the motor-mounted cart on soft ground without additional wheel fixation. Under the weight of the engine, the cart can spontaneously roll down the slope, causing the motor to fall into water or onto rocks.
After use, especially in salt water, be sure to wash the cart with fresh water. Salt destroys metal and welds much faster than fresh water. Smear wheel bearings regularly if they do not have seals.
Observing these simple rules will allow you to enjoy fishing and cruising without being distracted by the problems with transporting equipment. A homemade cart made with soul and calculation is often more reliable and durable than many factory counterparts.
Frequently Asked Questions (FAQ)
Can I use a cart to transport the motor in the trunk of the car?
Yes, you can, but only if the cart is foldable or collapsible, and you need to design with removable handles, a folding wheelbase, or the ability to dismantle the vertical rack, and when you assemble it, the cart takes up a lot of space.
Which type of wheels is better for sandy shore?
For sand and soft ground, narrow cast wheels are absolutely not suitable, they will simply sink. The only right solution is wide pneumatic wheels (like garden wheels) or wheels with low pressure and large diameters. They distribute weight and do not fail.
Do I need to remove lower unit from the engine before installing it on the cart?
In most cases, no, the cart is designed to carry the motor assembly, but if the engine is very heavy or the cart design does not allow it to be installed with a lower unit due to its dimensions, the lower unit can be removed, but this will require additional tools and time.
How to protect a cart from rust if it is stored on the street?
Storage outside is highly undesirable. If there is no other option, use thick or tarpaulin covers, regularly update the paintwork and lubricate all moving parts with thick lubrication (litol, solidol), ideally put in the garage or shed.