Operation of small-sized inflatable boats and PVC boats with outboard motors with a capacity of 9.9 horsepower requires not only a reliable boat, but also a competent approach to the storage of attachments. outboard motorEven in a relatively compact design, it is a complex technical unit with a carburetor, ignition system and lower unit, which are extremely sensitive to improper position in prolonged downtime. Simple storage on the floor of a garage or on a balcony often leads to deformation of the lower unit, moisture entering the exhaust system and difficulties in transporting to the descent site.
That is why specialized pole-cart It's an indispensable accessory for any small-size boat owner, and it allows you to lock the engine in a strictly vertical position, eliminating the leakage of fuel and oil, and also ensures the mobility of the entire assembly. drawingsIt can be adapted to the specific dimensions of your equipment and the features of the room where it will be stored.
In this article, we will discuss in detail the process of designing and assembling a reliable support structure, you will learn what materials are best suited to create a frame, how to correctly calculate the mounting points and what nuances you need to take into account to make sure that you are able to build a frame. 9.9 hp engine. It's sustainable and safe, and a well-designed trolley will not only extend the life of your engine, but it will also make it much easier to prepare for fishing.
Why do you need a stationary support for the engine
Many boat owners underestimate the importance of properly storing an outboard motor, believing that it is enough just to put it on a lower unit or put it on its side. engine 9.9 hp implies that if you are in a long horizontal position or with a skew, you can leak fuel into the crankcase, which at the next start will lead to hydraulic shock or difficulties with ignition of the mixture.
It also provides a convenient transportation vehicle, and it is extremely difficult and traumatic to carry an engine weighing about 35-40 kilograms over long distances over rough ground or gravel surfaces alone, and the wheelbase makes it easy to move the unit from the car to the pier without overloading the vehicle. Mobility This is a key factor, especially if you change fishing spots frequently.
⚠️ Warning: Never leave the engine (long-term) installed on the boat in winter without special treatment, but you can not remove it "at will" - only a rigid fixation on the rack guarantees the safety of lower unit from accidental impacts.
Another important aspect is the organization of space in the garage or pantry. Stand-cart It takes up a minimum of space, allowing the engine to be compactly placed against the wall without cluttering the passageway. Unlike chaotic storage, it allows you to always keep the engine clean and ready for the season. Moreover, it is convenient to carry out minor maintenance, changing candles or checking the oil level on a properly assembled trolley.
Selection of materials and tools for manufacturing
Before starting welding and cutting metal, you need to decide on the material of the frame. For the manufacture of a cart for an outboard motor 9.9 hp is optimally suited profile-pipe It has a high bending and torsion strength, and is less weighted than a round rolled rolled with similar bearing capacity, the most common size being 20x20 mm or 25x25 mm with a 2mm wall.
For the support pad on which lower unit will rely, it is better to use sheet metal at least 3-4 mm thick or strong plywood protected by moisture-resistant impregnation. metal-platform It is preferable, as it is not afraid of fuel (fuel and lubricants) that can drip from the engine, and is easy to wash. As a wheelbase, wheels from garden carts or, in the budget version, reinforced furniture rollers with bearings are ideal.
The tools are standard for any workshop: a grinding machine ("Bulgarka") with metal discs, a welding inverter for connecting knots, a roulette, a coal miner and a marker for marking. You also need an electric drill to drill holes for fasteners. If you plan to make the structure collapsible, then you will need to use it. metal-cutting for accurate fitting of threaded joints.
It's important to remember safety when working with metal. Use safety glasses and gloves. All welds after cooling should be cleaned of slag and treated with corrosion-resistant compound, since the trolley will be operated in high humidity conditions. Quality of welding It directly affects the durability of the entire structure.
Drawing and sizing calculation
Creation drawing It's the foundation of a successful assembly. You don't have to rely on an eye meter, because the 9.9 hp engine has a specific center of gravity and dimensions. The standard height of the rack is usually between 900 and 1,100 mm, which allows you to easily attach and remove the engine without tilting your back. The width of the base should be such that the structure does not overturn when you're facing lateral load, optimally 300-400 mm.
The key piece of the drawing is the mounting bracket, which is designed to match the seating position on your engine's lower unit, and the distance between the mounting holes from different manufacturers (Yamaha, Mercury, Tohatsu) can vary slightly, so that's why you can't do that. measurement The height of the motor on the rack is calculated so that the lower unit does not touch the floor, but the entire assembly remains stable.
| Parameter | Recommended value | Note |
|---|---|---|
| Height of vertical pillar | 950 - 1050 mm | Depends on the height of the owner |
| Breadth of base | 300-400 mm | For sustainability |
| Distance of anchorage holes | Individually | Measure the engine. |
| Diameter of wheels | 100 - 150 mm | For cross-country |
When designing, consider the possibility of installing additional elements, for example, hooks for suspension of the fuel tank or shelves for tools. ergonomics Important: the center of gravity of the assembled structure (trolley + motor) should fall on the axle of the wheels or just ahead of it, so that during transportation, excessive efforts are not required to maintain balance.
Nuances of drawing for two-stroke engines
For two-stroke 9.9 hp engines, it is critical to include a small slope or a special gutter at the bottom of the rack in the drawing, which is necessary for condensate drain and oil residues that can be released during storage, preventing them from accumulating in the muffler.
Step-by-step instructions for assembling the frame
The assembly process begins with the slicing of the workpieces according to the drawing developed. SCHOOL We're going to have a cutting disc to get the edges straight, and we're going to start by assembling the base frame, and this is a rectangle or a square to the corners of which weld vertical struts. scarf (triangular reinforcing plates) in the places of welded joints.
Then we go to the vertical part, which can be U-shaped or T-shaped. The P-shaped part is more stable and allows you to securely lock the motor on both sides, except for the backlash. The T-shaped part is easier to make, but requires very high-quality mounting of the motor itself. At the height corresponding to the fastening holes of the lower unit, welded a crossbar with drilled holes under the bolts.
☑️ Frame assembly steps
The wheelbase can be made stationary or rotary. For a 9.9 hp engine, two wheels are enough, fixed on one axis at the rear of the base, the axis is made of a 10-12 mm diameter rod that is passed through holes in the side walls of the frame or welded bushings. Fixing the axis It is carried out with splints or nuts with growers so that the wheels do not fly off during operation.
⚠️ Warning: When welding a thin-walled profile pipe, do not overheat the metal to avoid burning through the walls. Make short welding seams of 2-3 cm with breaks for cooling, this will prevent deformation of the geometry of the frame.
The final step in the frame assembly is to install the stops, so that the motor doesn't dangle from side to side, you can weld small corners or stoppers at the top of the rack, which is especially true when you're on rough roads. Stiffness of fixation - the security of your cargo.
Installation of the fastening system and improvement
The fastener is the interface between the cart and the engine. The 9.9 hp motor is most often used with M10 or M12 bolts. It is important to choose bolts of such length that they fit safely into the threaded holes of the lower unit, but do not rest on the internal mechanisms. puck and preferably rubber gaskets to quench vibrations.
Some craftsmen prefer to make a quick-removal system based on rods or squirts, rather than a rigid bolt connection, but for stationary storage and transportation, the bolt connection is more reliable. If you plan to remove and install the motor often, you can use it. quick-nut Or lambs, but you need to control their puff more carefully.
You can also have a hook or a loop to hold the fuel tank, so you can free your hands and keep the canister from falling, you can have the tank below the center of gravity of the motor, so you don't have to upset the balance of the cart, and you can also have a place to store your keys or a small remix.
Use hammer paint or epoxy enamel to finish the trolley, and these compounds create a strong film that is resistant to scratches, oil and gasoline, which is critical for accessories that come in contact with boating equipment.
Check the stability of the structure, the motor should be in place without skewing, if there is a blockage in one side, then the wheelbase is not symmetrical or the floor in the garage is sloping, in the latter case you can make one of the supports adjustable height.
Corrosion protection and maintenance
The metal trolley, like any tool used in water, is subject to aggressive moisture and salts, and once welding and seam cleaning are completed, the entire structure must be degreased and coated. primer The best choice would be zinc soil, which provides active anti-corrosion protection even if the top layer of paint is damaged.
The finishing should be durable, alkyd enamels or metal paints are well-established, but the bright colors (yellow, orange) make the trolley more visible against the water and soil, reducing the risk of losing sight of it. Regular examination The coating will allow you to notice and paint the chips that appear in time.
The maintenance of the trolley is minimal: once a season, check the tightening of bolt joints, lubricate the axis of the wheels and check the integrity of the rubber gaskets. If you use the trolley in winter, clean it of snow and ice so that moisture does not destroy the metal when it freezes. Accessories care They extend their service life for years.
A properly assembled and painted 9.9 hp cart has been around for decades, becoming a reliable helper that keeps your engine and your nerves safe every time you go out into the water.
Frequently Asked Questions (FAQ)
Can you make a cart entirely out of wood?
Theoretically, you can use 50x50 mm bars and moisture-resistant plywood, but it's less durable in garage and outdoor environments. It absorbs moisture, it can dry or rot. A 20x20 mm metal profile is more reliable and compact.
How much weight can such a cart bear?
The design of the profile pipe 20x20 mm with a wall of 2 mm calmly withstands the load of up to 80-100 kg. The engine 9.9 hp weighs about 35-40 kg, so that the safety margin is more than two times, which guarantees safety.
Do I need to remove the carburetor when installed on the rack?
No, you don't have to take off the carburetor, you put the motor on the rack when it's assembled, and you just have to make sure that the crane is locked off, and there's no excess fuel left in the float chamber that can leak out during transportation.
Will this drawing be suitable for 8 hp or 15 hp engines?
The dimensions of the lower unit engines 8, 9.9 and 15 hp are often similar, but the mounting points may differ. check the passport of a specific engine Or by direct measurement.