
RCPOWERBOAT WIKI







Zenoah engines
Zenoah is a brand of engines produced by Japanese manufacturer Komatsu Zenoah. The PUM series of engines are water-cooled, two-stroke engines that are designed to power a variety of boats, including fishing boats, pleasure craft, and racing boats.
Some features of the Zenoah PUM water-cooled engines for boats include:
- Available in a range of sizes and power outputs, from 23cc to 45cc and 1.6 horsepower to 4.2 horsepower.
- Electronic ignition for reliable starting and smooth operation.
- High-capacity water cooling system to maintain engine temperature and prevent overheating.
- Lightweight design for improved boat performance and handling.
- Low-emission design to meet environmental regulations.
In addition, Zenoah offers a range of accessories and replacement parts for their PUM engines, including propellers, carburetors, fuel tanks, and spark plugs.
If you are considering using a Zenoah PUM engine in your boat, it is important to consult the manufacturer’s recommendations and specifications to ensure that you select the appropriate engine size and power output for your particular boat and intended use.









The FSR Classes
- FSR 3.5cc: This class of model raceboat features a nitro-powered engine with a displacement of 3.5 cubic centimeters (cc). These boats can reach speeds of up to 60 mph and are typically around 30 inches in length.
- FSR 7.5cc: This class of model raceboat features a nitro-powered engine with a displacement of 7.5cc. These boats can reach speeds of up to 70 mph and are typically around 40 inches in length.
- FSR 15cc: This class of model raceboat features a nitro-powered engine with a displacement of 15cc. These boats can reach speeds of up to 80 mph and are typically around 48 inches in length.
- FSR 35cc: This class of model raceboat features a nitro-powered engine with a displacement of 35cc. These boats can reach speeds of up to 100 mph and are typically around 60 inches in length.
- FSR-H: This class of model raceboat features a gas-powered engine and has no displacement limit. These boats can reach speeds of up to 85 mph and are typically around 48 inches in length.
- FSR-O: This class of model raceboat features an electric motor and has no displacement limit. These boats can reach speeds of up to 50 mph and are typically around 36 inches in length.
Note: It’s worth mentioning that the specifications and rules for these classes may vary depending on the specific race or organization.

Build your RC Powerboat
To build an RC powerboat with two gas 2-stroke engines and steerable surface drives, you will need the following components:
- Hull: You will need a suitable hull for your RC powerboat. The hull should be designed to accommodate two gas engines and have enough space for the steerable surface drives.
- Engines: You will need two gas 2-stroke engines. The engines should be of the same type and power to ensure balanced performance.
- Fuel tank: You will need a fuel tank to hold the fuel for your engines. The fuel tank should be large enough to provide sufficient fuel for both engines to run for the desired amount of time.
- Radio control system: You will need a radio control system that can control both engines and the steerable surface drives. The radio control system should be compatible with your boat and provide a reliable connection between the boat and the controller.
- Propellers: You will need two propellers that are designed to work with gas engines. The propellers should be matched to the engines to provide optimal performance.
- Steerable surface drives: You will need two steerable surface drives that can be controlled by the radio control system. The surface drives should be designed to work with your hull and provide the desired level of steering control.
- Servos: You will need servos to control the steering of the surface drives. The servos should be compatible with your radio control system and be able to provide enough power to move the surface drives.
- Batteries: You will need batteries to power the radio control system and the servos. The batteries should be chosen based on the power requirements of your system and the desired runtime.
- Exhaust system: You will need an exhaust system to vent the exhaust gases from the engines. The exhaust system should be designed to work with your engines and meet any noise regulations in your area.
- Cooling system: You will need a cooling system to keep the engines from overheating. The cooling system should be designed to work with your engines and provide sufficient cooling for prolonged use.
Overall, building an RC powerboat with two gas 2-stroke engines and steerable surface drives can be a complex project, and it’s important to ensure that all the components are compatible and properly installed for optimal performance and safety.

RESIN IN GENERAL
EPOXY RESIN
Epoxy resins are a type of thermosetting plastic that can be used as a matrix material for composites. Composites are materials made from two or more constituent materials with different physical or chemical properties, which when combined, create a new material with improved performance characteristics.
Epoxy resins are commonly used in composites because they are strong, lightweight, and resistant to moisture, chemicals, and heat. They can be used to bond together a variety of reinforcement materials, including fabrics made from carbon, glass, kevlar, and rovings.
CARBON
Carbon fabric is made from carbon fibers, which are thin, strong, and lightweight. Carbon fiber composites have a high strength-to-weight ratio and are commonly used in aerospace and high-performance applications.
GLASS
Glass fabric is made from glass fibers, which are also thin and lightweight but not as strong as carbon fibers. Glass fiber composites are commonly used in marine, automotive, and construction applications.
KEVLAR
Kevlar fabric is made from aramid fibers, which have a high strength-to-weight ratio and are highly resistant to impact and abrasion. Kevlar composites are commonly used in ballistic armor, sports equipment, and aerospace applications.
ROVINGS
Rovings are bundles of continuous fibers that can be used in composite manufacturing. They can be made from a variety of materials, including carbon, glass, and kevlar, and can be used to create composite structures with high strength and stiffness.
The choice of fabric and resin combination will depend on the specific application requirements, including the desired strength, stiffness, weight, and other performance characteristics. Different combinations of fabric and resin can be used to create composites with a wide range of properties, making them suitable for a variety of applications.
PROCESSING METHODS
Vacuum infusion is a composite manufacturing technique that uses vacuum pressure to infuse resin into a dry reinforcement material such as carbon, glass, kevlar, or rovings. The process involves placing the dry reinforcement material into a mold and sealing it with a vacuum bag. A vacuum pump is then used to evacuate the air from the mold, creating a vacuum. The resin is then introduced into the mold and drawn into the reinforcement material under the pressure differential created by the vacuum. The resulting composite is then cured to create a strong, lightweight, and durable part.
The combination of vacuum infusion with epoxy resins and various fabric types can lead to several benefits. The use of vacuum infusion allows for better control of the resin-to-fiber ratio, leading to a more consistent and uniform composite. It also helps to eliminate voids and air pockets that can weaken the composite structure. The use of epoxy resins provides high strength, stiffness, and durability while maintaining a low weight, making them ideal for high-performance applications. Different fabric types can be used to tailor the composite’s properties to the specific application requirements, allowing for a wide range of applications.
The combination of vacuum infusion with epoxy resins and various fabric types has become popular in industries such as aerospace, automotive, marine, and wind energy. It offers several advantages over traditional composite manufacturing techniques, such as hand lay-up, including higher strength-to-weight ratios, improved dimensional stability, and reduced material waste.
