Fast ship model class F3V. Drawing, description

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Fast ship model class F3V. Tips for a modeller

Modeling

The body of the model is made of fiberglass by gluing in a matrix, followed by pressing with a punch, the binder is epoxy resin.

After gluing the "shell" of the hull is not rigid enough, so two frames are glued into it, dividing the hull into three compartments.

Radio equipment and steering machines are located in the stern, the engine, gearbox, fuel tank and silencer are located in the central one, and the frame between the central and bow compartments ensures unsinkability in case of accidental hits of the model against obstacles. Of course, all bulkheads (frames) must be watertight.

Rice. 1 (click to enlarge). F3V class model: 1, 4 - frames (plywood S3 mm), 2 - engine "Rossi-15", 3 - fuel tank, 5 - cover (fiberglass), 6 - steering machine, 7 - receiver, 8 - rudder blade ( brass), 9 - water intake of the engine cooling system (brass T4X0.5 mm), 10 - propeller (kapron), 11 - propeller shaft (wire ОВС or U8, Ø 4 mm), 12 - bracket (brass S1,5 mm ), 13 - deadwood (brass T7X1 mm), 14 - keel (brass S2 mm), 15 - gear case (D16T), 16 - gear wheel (kapronite), 17 - gear (steel), 18 - flywheel (brass), 19 - steering bar (D16T S2 mm), 20 - battery, 21 - exhaust pipe (brass T10X0,5 mm), 22 - muffler (D16T), 23 - engine head, 24 - engine cooling jacket (tin), 25 - carburetor , 26 - antenna, 27 - hot water outlet from the engine

The power plant of the model is the Rossi-15 engine with normal exhaust phases. Carburetor from the serial engine "Flight-7,5". The torque is transmitted to the screw through a gearbox with cylindrical gears, its gear ratio is 0,562. The drive gear of the gearbox is steel, the gear wheel is made of capronite. The engine is equipped with a silencer from the same "Flight". True, to reduce the noise level to an acceptable level (80 dB), an additional camera had to be installed on it. Fuel tank capacity - 100 ml; it can be soldered from tin or use a plastic bottle of suitable volume.

Domestic engines of the corresponding cubic capacity can also successfully work on the model. We do not recommend only operating them at maximum speed - this dramatically reduces the resource and increases the noise level. If the latter, despite the installation of a silencer, is still high enough, connect the outlet pipe of the cooling system to the exhaust pipe. We recommend mounting the engine to the gearbox and the gearbox to the housing on rubber shock absorbers. If even after such measures the noise level exceeds the maximum permissible, paste over the engine compartment with noise-absorbing material or coat it with mastic. Please note that they must not be dissolved by the fuel.

The deadwood is made from a brass tube with an outer diameter of 7 mm and a wall thickness of 1 mm. At its ends, gland bushings (bronze) should be soldered, and an oiler should be installed on it. Fastening the deadwood to the body of the model using a brass bracket.

Rice. 2 (click to enlarge). Gate passing sequence: 1 - start, 2 - course of the model, 3 - buoys on the course, 4 - finish, 5 - starting bridge

Rice. 3 (click to enlarge). The heading of the model, ensuring the correct entry into the gate

Rice. 4 (click to enlarge). Common mistakes when approaching the gate

Rice. 5 (click to enlarge). Incorrect course of the model during the passage of the distance (dashed line) and correction of errors made by the modeler (solid line)

Rice. 6 (click to enlarge). Exercises for practicing driving a model with a figured course

The propeller shaft is best made from steel wire grades OVS or U8; its Ø 4 mm. The propeller hub (Ø 40 mm, pitch - 55 mm) has a central hole with an M4 mm thread, the same thread is on the propeller shaft. Docking of the gearbox with the propeller shaft through the coupling.

A few words should be said about the engine cooling system. On models of this class, it is cooled by outboard water, for which an intake is placed in the diametrical plane immediately behind the screw - a brass tube with an external Ø 4 mm. With the engine cooling jacket, soldered from tin, the intake is connected with a vinyl chloride tube. From the cooling jacket, water is discharged overboard or into the engine exhaust pipe.

The rudder blade is cut out of 2 mm thick brass sheet. Baler - made of steel wire Ø 4 mm, it is connected to the feather by soldering. A bar with several holes is installed in the upper part of the baler, which is connected by rods to the steering machine.

Keel made of sheet brass 2 mm thick. It is fixed near the center of gravity of the model. The final fixation of the keel should be carried out after experimental launches of the model, taking into account its stability on the course.

First time on the water

To adjust the model on the water, you should choose a calm day so that there are no waves and ripples in the water area. At first, it is better to run the model with an assistant. It is his responsibility to hold the model with the engine running in place while checking the operation of the steering.

Before launch, check how the model "stands" on the water. If you find a list, eliminate it by moving the fuel tank or battery. Please note that a miniature boat should have a slight bow trim.

At the first launches, try to ensure that the model with the rudder undeflected goes straight without burying its nose. When turning, the board must not be immersed in water.

Debugging should be completed by checking its behavior in all engine operating modes. Pay special attention to the course with a sharp shift of the steering wheel. The optimal variant of the transfer should be selected taking into account the minimum circulation of the model.

Distance training

We will assume that the model has already been debugged and you can start training at a distance according to the movement pattern. In accordance with the rules of the model ship competition, the model must consistently pass all the gates on the course without touching the buoys. Each violation in this case entails penalty points imposed on the competitor.

From the very beginning, accustom yourself to the correct "entry" through the gate. Bring the model to a given course in advance at low speed. This is the only way to achieve a "clean" passage of the gate. Please note that the rules limit the execution time of individual figures (see table).

The dependence of the assessment on the time of passing the figure course (click to enlarge)

The rules of the competition also indicate that if the model aircraft did not pass through the gate and at the same time crossed the imaginary target of the triangle, then it cannot be returned to repeat the maneuver. In such cases, it is necessary to continue moving forward in accordance with the figured course execution scheme.

Good results can be achieved by practicing the exercises shown in Figures 2-6. Please note that in order to pass the upper gate ("figure eight"), the model should be moved 0,5-1 m to the right of the imaginary center line of the triangle in advance. When visually approaching the first buoy, sharply shift the rudder to the left so that the model gets into the gate. Since you had to determine the minimum turning radius at the maximum rudder deflection in the preliminary runs of the model, you will be able to choose the moment when the rudder should be shifted to the right. Then the model will describe a loop around the upper buoy and enter the gate cleanly. Don't be discouraged if you don't manage to make this difficult maneuver right away - gaining experience in training, you will soon become an ace in figure driving of high-speed radio-controlled models of the F3V class.

Author: V.Lyasnikov

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