The proper storage of an attachment motor is not just a matter of convenience, but a necessity that prolongs the life of an expensive unit. Many boat owners mistakenly believe that it is enough just to remove the motor and put it on its side or put it vertically, ignoring the importance of fixation. boat-mount It plays a key role in preventing deformation of the lower unit, water entering the carburetor and accidental damage during transportation.
In this article, we will discuss in detail what dimensions are optimal for engines of different power, and why there is no universal solution for everyone. You will learn how to calculate the necessary parameters for your model, whether it is a compact twin-power or a heavy five-horsepower unit. Understanding these nuances will help you avoid expensive repairs and ensure reliable storage of equipment in the off-season.
Before you start manufacturing or buying, it's important to realize that the geometry of the support directly affects the stability of the structure. gap Or a site that's too narrow can cause the motor to fall at the slightest push, so let's look at the basic principles that professionals use when designing these devices.
Criteria for the selection of dimensions for different capacities
The first thing to consider when sizing is the weight and dimensions of the engine itself. Yamaha 2 or Mercury 3.3The key here is the height, which allows the motor to be fixed in a strictly vertical position so that the residue of fuel and oil does not leak out through the drainage holes.
That's a game-changer when it comes to engines that are 5 hp or higher. Tohatsu 9.8 or Yamaha 15They require a more massive platform. The width of the stand In this case, it has to be increased to distribute the load, and the attachment points have to be strengthened, and ignoring this rule can lead to the destruction of the structure under the weight of the motor.
⚠️ Warning: Never use 2-horsepower motor stands to install engines over 5 hp This can lead to a rollover and serious injuries!
Also consider the type of lower unit: a short leg (S) and a long leg (L) require different heights of the support pad so that the screw does not touch the ground and the lower unit does not sway. the distance from the floor to the bottom cut of lower unit is at least 15-20 cmThis ensures a safe clearance for any modifications.
- 📏 For engines 2-3.5 hp. the optimal base area is 25x25 cm.
- ⚓ Engines 5-6 hp require a platform size of at least 35x35 cm.
- 🚀 For powerful models from 8 hp, the width and depth of the stand should be from 40 cm.
- 🔧 The height of the rack should be adjusted in the range from 60 to 80 cm for ease of maintenance.
Standard dimensions and drawings for engines 2-5 hp
The most popular category among anglers and tourists is 2 to 5 horsepower engines, a kind of "gold standard" size that strikes a balance between stability and compactness, most often an inverted "T" or U-frame design.
The classic stand for this category has a width of the upper bar about 30-35 cm This is enough to cover the sole of the motor with a margin. the height of the vertical rack usually varies between 70-75 cm, which allows you to comfortably work with the engine without tilting too low during maintenance.
Drawing of a simple wooden stand
Vertical rack (timber 50x50 mm) 75 cm high Upper bar (board 20x100 mm) 35 cm long Skewings for stiffness of timber 30x30 mm Base - square 30x30 cm of plywood 18 mm.
When you make your own hand, you need to be proportional, and if you make the top pad too narrow, the motor will hang with only the brackets, which creates dangerous stress in the mounting areas, and if the pad is too wide, it will make it difficult to lock and transport.
☑️ Checking the dimensions before assembly
Design features for heavy engines
When we talk about engines with 8 hp and up, there are very different physical laws that come into play, and the weight of these units can reach 30-40 kg or more, which requires a serious approach to the development of the engine. load-bearing It's not really a place where you can rely on lightweight wooden bars, and often you need metal or reinforced profiles.
The dimensions of the heavy motor stand increase not only in width, but also in depth, which is necessary to create a low center of gravity, the optimal width of the base for these models is 45-50 cm, and the depth is up to 40 cm, which allows you to place the motor so that it does not stagger even when you accidentally hit.
The fixation system becomes an important element. For heavy engines, weight alone is often not enough. Additional stops or belts must be provided. transom plate must be adjacent to the vertical surface of the stand with the entire plane, without distortion.
⚠️ Warning: When installing a heavy motor on a stand, make sure the floor surface is flat and hard. On soft ground or carpet, the narrow legs of the stand may fail, causing the load to fall.
Also, consider the presence of an electric starter and remote control. Connectors and connectors should not rest on the elements of the stand, so the depth of the structure sometimes needs to be increased to accommodate the protruding parts of the engine.
Materials of manufacture: wood, metal or plastic
The material choice dictates the size and weight of the stand itself. Wood is the most affordable and easy to handle material. However, it is afraid of moisture, so wooden structures require careful soaking in olive or varnish. A 5-horsepower wooden stand will weigh about 3-4 kg.
Metal structures made of profiled pipes have maximum strength and durability, they allow you to make the elements thinner while maintaining rigidity, which saves space during storage. However, the metal is subject to corrosion, especially in contact with salt water, so you need quality painting or use of stainless steel.
Plastic and composite materials are modern. They're lightweight, they don't rot or they don't rust, but it's harder to find a finished solution or a cross-sectional profile, and often craftsmen use large-diameter PVC residues or building profiles.
| Materials | Weight of construction (for 5 hp) | Durability | Difficulty of manufacture |
|---|---|---|---|
| Tree (pine/spruce) | 3-4 kg | Medium (requires care) | Low. |
| Steel (profile) | 5-7 kg | High (when painted) | Medium (welding required) |
| aluminum | 2-3 kg | Very high. | High (needs argon welding) |
| Plastic/PVC | 1-2 kg | High. | Low (glue/bolts) |
Use rubber pads on the motor contact points with the stand, which will protect the paintwork of the lower unit from scratches and prevent slipping.
Instructions for assembling a universal stand yourself
Building a stand yourself is a great way to get a product that is perfect for your needs. Consider the assembly process using a wooden structure, as it is most affordable for home use without special tools.
You need to start by preparing materials. You need a 50x50 mm bar for the racks, a 20x100 mm board for the crossbars, and a 15-18 mm plywood sheet for the base. All wooden elements must be dry to avoid deformation after drying.
Tool list:- Electric jigsaw or hacksaw
- Schurupovert.
- Wood screws (50-70 mm)
- Roulette and pencil.
- Sandpaper.
You start with the base, you hold the four bars squared, you keep the right angles, then you set the vertical struts, and it's critical to follow. perpendicularityOtherwise, the motor will be curved, the upper bar is attached to the racks with metal corners to reinforce the structure.
The key to sustainability is to use triangular scarves at the angles of the vertical and horizontal elements, which will eliminate the wobbling of the structure under load.
After the frame is assembled, it is recommended to cover the tree with a protective compound, which can be terraced oil, yacht varnish or ordinary olive oil, followed by painting, and this treatment will protect the stand from moisture, which will inevitably remain on the engine after operation.
Frequent errors in determining sizes
One of the most common mistakes is ignoring the height of the handle, and if the handle is too low, it can hit the floor or the structure, which will cause the control to break. Always measure the size of the engine assembly, not just the lower unit.
The second mistake is saving on the width of the base, and by trying to make the stand compact for storage in the trunk, users make it so narrow that the slightest tilt leads to a crash of the engine. Sustainable It's more compact than compact.
The third mistake is that you don't have trans type accounting. Some modern motors have specific mounts or shifted center of gravity. A standard stand may not be suitable unless you take into account the individual specifications of the model. Always try on before you finalize the elements.
Can I use one stand for motors of different power?
Yes, this is possible if the stand design has adjustable elements or a sufficiently wide area, for example, a 6 hp stand can easily withstand a 2 hp engine, the main thing is that the mounting holes or stops allow a smaller unit to be reliably fixed.
Do I need to remove the screw before installing on the stand?
Removing the propeller before mounting on the stand is not necessary if the design allows you to place the motor with the propeller. However, if the stand has a height or depth limiter, removing the screw may be necessary for dense installation.
What is the minimum gap from floor to lower unit?
The recommended minimum clearance is 10-15 cm This is necessary to ensure that the lower unit does not touch the wet or dirty floor, which can cause corrosion, and the gap provides ventilation to the bottom of the engine.