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Chapter 29 Design Concept

Engineer Rhodiola went on to introduce the design concept of this copycat missile.

Because this cruise missile does not have to make a large flight maneuver like an ordinary aircraft, the design thrust-to-weight ratio is about ., that is, the maximum take-off weight of the missile is about kilograms.

Of course, you can also choose foreign model commercial machines with a higher thrust-to-weight ratio and more expensive prices.

The engine uses aviation kerosene,

The fuel consumption at full load is about .8 liters per minute, and after actual testing, the maximum actual working time of the engine is about 1 hour. In this design, the fuel tank capacity in the body of the bomb is about 8 liters. The flight speed is km / h.

This engine is produced in the United States or Denmark, the price is less than 3 US dollars a piece, I heard that domestic manufacturers also want to produce, the price is expected to be half of the imported products.

Engine cost: 4 yuan.

Second: projectile body/aerodynamic shape

Since the missile is not an airplane, there is no need to consider too much maneuvering flight, and the shape of the missile body is as simple as possible: the cylindrical head fairing of the missile body is used to maintain high structural strength under the condition of the most economical material, and at the same time is conducive to the installation of internal equipment. The design diameter is 3 cm, the total length is 18 cm, and the internal volume is about .3 cubic meters.

The purpose of using a straight upper monoplane wing is to simplify the design and manufacture and provide a relatively large lift-to-drag ratio, and the purpose of using ailerons is to facilitate maneuvering and control, which is commonly used in making models and is more mature).

The design wingspan is 1.8 meters, the chord length is .meters, and the wing area is .7 square meters. The V-shaped composite tail structure is adopted, because this structure has a good foundation in the model aircraft, the control and control are more mature, and the stability is also better, so the use of two tail wings instead of the traditional three, both as the rudder, and to control the attitude.

The benefits are twofold: simplifying the structure and avoiding the influence of the engine's airflow. The engine is symmetrically installed on both sides of the missile body, and the center is in a backward position, which has the advantage of not bothering to design the air intake tract and tail nozzle, and keeps the distance between the two engines as much as possible, which is conducive to the engine heat dissipation and avoids the interference of heat on the guidance and servo in the missile body.

The whole projectile body is made of aluminum alloy keel, buy aluminum alloy profiles, riveted structure. The skin is made of Plexiglap or carbon fiber, the latter being much more expensive but much lighter for the same strength.

The layout of the cylindrical missile body from front to rear is: airspeed tube, missile computer compartment, sensor compartment, elastic wing servo, throttle governor, fuel tank, warhead, tail servo.

Materials used include:

1: 6 model servos, two for each wing, one for the tail, unit price: 8 yuan, a total of 48 yuan

: V-shaped tail proportional distributor, unit price: 14 yuan.

3: Two throttle proportional governors, unit price: 1 yuan, total: yuan.

4: Two oil pumps, using car wiper water pumps, unit price: yuan, a total of 4 yuan.

: a number of aluminum alloy profiles, a number of skins, a number of hardware parts, a variety of adhesives, sealants, paints, hardware parts, and a number of standard parts.

The cost of the projectile body is within the element.

Three: guidance, control part.

In fact, the design of this part is the most interesting, the whole system includes hardware, software two parts, first talk about the hardware part.

The missile computer is responsible for two aspects of work, one is guidance, the other is control, using the design idea of a standard micro industrial computer.

Taiwan's Advantech 61 motherboard, X86133 CPU, 3 memory, provides 4 ports, 1 8-bit ISA socket, and even has an integrated graphics card and sound card, the size is only equivalent to a 3-inch floppy disk, plus a 6-inch electronic disk, a D/A converter for controlling the servo, and the weight does not exceed 1 kg.

The total price is around yuan.

The missile uses a powerful joint guidance method of GPS terrain inertial guidance.

Terrain: Industrial miniature radio altimeter, vertical distance of 3 meters, RS3 output, including probe weight of about 3 grams. Prices in Beijing are diverse.

Inertia: industrial miniature gyroscope, with magnetic compass, RS3 output, weight of about grams, Beijing price of more than 1 yuan.

All of the above equipment use V power supply, the total current is less than 3 amps including the servo, considering the total working time of 1 hour, /4, the lithium battery pack for the laptop computer is selected for power supply, and the cost can also be pressed below the yuan.

After listening to the introduction, Li Baoqiang was dumbfounded, this is simply a copycat cruise missile, and it is so cheap, he is very interested: "What is the final price?"

Bai Rhodiola said proudly: "If you don't calculate the research cost, the cost is 100,000 yuan, and if it is mass-produced, the cost can be further reduced." ”

"The cost of research and development must be taken into account, in this way, if it is sold to the outside world, the price will be increased by 200 percent, 30,000 yuan a piece, I think the market must be hot, this is only 50,000 US dollars, cheap and big, absolutely sought-after!"

Li Moyang rubbed his hands excitedly, and his brain was filled, the land of Africa, uh, no, those war-torn third world countries in the world, orders are flooding, counting money and counting to hand cramps.

Rhodiola Bai, Wang Xiaolong, and several other key workers also became excited when they heard Li Moyang say this, who would have thought that the copycat cruise missiles that were concocted by such a few people would have such good prospects, it was too disadvantageous.

Li Baoqiang thought for a while, and his eyes lit up: "Just do what you say! You have done a good job in cost control, but you don't have to be too petty, everything is based on combat effectiveness as the ultimate goal, and what we want is not a fun model aircraft, but a reliable weapon." Let's go and experiment with this cruise missile now. ”

Bai Rhodiola nodded in agreement: "Any weapon is successful after thousands of failures, and I can't guarantee that there will be no mistakes in the test process." ”

"It's okay, let's try it now, without a warhead, just as if we were playing with a model airplane. Li Baoqiang laughed heartily.

Wang Xiaolong is a pity: "My kind of spike missile, without solid fuel, can't be experimented, alas"

"There will be bread, don't rush, produce it first, I want to find a way to do solid fuel, if it doesn't work, export it first, and it will be better to get fuel when it comes abroad." ”

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