How do band parachutes work

How to make a parachute for a rocket of the substance. Rocket salinization system.

The mozgorovod culture. about that, how to buildb and start the hydrorastructure, but not only, but professionally, based on my many years of experience.

I am not responsible for any damage, for all risks associated with the production and start-up of this Hydroraet, the responsibility that you take yourself!

Happy construction and start eros cells!

Step 1: get started

The hydroer is powered by a pressure of compressed air that has been transferred to the water, causing it to target the hydraulic plate.

If you take 1 standard two-liter plastic bottle, a 120 PSI rocket under pressure will reach a height of about 30 meters. However, if you take 2 two liter bottles, 120 PSI hydrorastructure under pressure will rise by about 45 meters because there is more air in the rocket, so the thrust will be greater. The second bottle only gives 15 extra meters as the mass of the homemade elevations increases.

Step 2: nasal cone

SUT from a bottle of the top and then cut off a neck from it. We take the ball for the pin-pong and half, plant the ball on the glue from the inside of the cut top of the bottle. The resulting two parts bond with glue or scotch.

Adding a dimensional nose cone shifts to the above center of gravity therefore makes the flight path handicrafts more stable.

Step 3: stabilizers

On the brain computer Blacks are drawn stabilizers, print them and cut out into shape. Then we glue the patterns to the cardboard, that is, we give stabilizers the desired rigidity and cut out along the contour. You can use corrugated plastic instead of cardboard.

Stabilizers that are mounted on the body of the missile with glue and tape.

Step 4: connection

Bottles of steps can be connected through the bottoms. To do this, holes with a diameter of 7-8 mm are drilled in the middle of the bottoms of the bottles, inserted into these holes from the inside and inside and sealed "DAD" 8mm-x sanitary couplings and bottles with two "Vatinen" are through one "MOM" coupling connected together.

Another combination of bottle covers. In the middle of the caps of the bottles, the holes with a diameter of 7 to 8 mm are also drilled, with the top of one cover being laid on top of another cover, drilled holes centered in the covers, and the 8 mm OH plumbing coupling is connected. Bottles screwed into the caps hydroracks.

Step 5: splicing

To combine two bottles together, as in the figure, to create a hermetic seal, three bottles are required.

First, the bottom ends of the two are cut into size bottles. Next, the top and bottom of the third bottle are cut, and the resulting ring is inserted halfway into the cut edges of two bottles. Joint seal and strengthens Scotch.

Step 6: startup

As a starting mechanism, I use a design developed in NASA. This mechanism allows you to vary the size of the nozzle of the rocket, that is, the optimal launch pressure in the system.

Board thickness 1.5 cm.
2 bolts 10mm.
Metal drill bit with a diameter of 10 mm
Tree drill with a diameter of 10 mm
6 nuts and washers with a diameter of 10 mm
Bicycle valve (can take from old cycle calculator)
Rubber stopper
Bicycle pump
2 tent Pall.
4 L-shape brackets

The launcher can withstand pressure depending on the rubber stopper. For this purpose, the plug connection and the rocket neck are configured by adjusting bolts.

Step 7: two stage rocket

For two-stage hydraulic structures, a design with a servo or pressure valve can be used.

15 cm tubes with a diameter of 22 mm
Plywood or plastic sheet (as the basis for the entire design)
Built-in check valve (valve comes from the pump)
First and second steps hydroracks

Insert the 2cm pipe 22mm in the first step. Use epoxy or PVC mastic to seal the inserted tube. Insert the check valve into a 22mm pipe and glue it on.
Cut from the plastic the elements of the additional fastening to hold the bottle in the desired position.

Hinner Breppy on the claw. If you are carrying a bottle (using petroleum jelly for tightness) make sure the clip on the tube is right near the neck of the first leg. Then heal your hinge on the neck of the bottle so that it was hermetic and steady.

Step 8: Triple Rocket Masters

Rocket carriers are easy to do because they just stick on the ejector bottle.

We put the places of attachment of missile carriers on the main phase. We build three missile carriers with a stabilizer and secure them in the marked places. We collect the triple rocket launch mechanism and test the rocket!

Step 9: parachute

The parachute system is laid out according to a simple gray.

The parachute cone is weakly mounted on the missile, so when the missile reaches its maximum altitude the weighty nose cone will fall to the ground and expand the parachute system.

We make a cone for a parachute compartment and try it in a nasal space, it must sit sufficiently on the nasal space. Drilled a hole in the nasal cavity and a parachute cone under the cable of the parachute system, we traveled and tie this exhaust cable.

Fresh parachute slings on the exhaust cord so that when the system is deployed the parachute system operates properly and the parachute cone is not lost.

Step 10: cargo compartment

The cargo bay is used to transport payload, such as an altitude sensor, accelerometer, or even a manual slug, but the drop from above can kill it.

Cut the bottom of any size from the bottle. Corrugated plastic cut out two bottles diameter disk. From the same plastic, cut the strip the width of the diameter of the bottle and the length of a little less than the hold. We glue the details and when the glue is dry, put in the cargo compartment and fill it with a lot of cargo.

Step 11: collect, run

Now that you know how to make all of the major hydraole nodes, you can start making your own self-decking!

It explains the many basic concepts in missile cells. If you're just starting to build your first missiles - check out this stuff.

Each flying rocket model has the following main parts: housing, stabilizers, parachulation system, guide rings, head fairing and motor. Find your appointment.

The housing is used to place the motor and the parachulation system. Stabilizers and guide rings are attached to it. To give the model a good aerodynamic shape, the top of the body ends with a head cover. Stabilizers are required for the resistance of the model in flight, and the parachulation system is to slow down the free fall. With the help of the guide rings, the model is attached to the rod before it is removed. The engine creates the necessary traction for the flight.

Construction model

Main material for flying rocket models. Watman glue out the housing and guide rings. Stabilizers are made from plywood or thin veneer. Pieces of paper are glued with joinery or casein glue and another nitroleum.

The manufacture of the model begins from the case. In the simplest models of missiles, it is cylindrical. A mandrel can be a round bar with a diameter of more than 20 mm, since this is the size of the most common motor. In order for it to be easily inserted, the diameter of the case should be a little larger.

An important geometric parameters of the model of the model are: diameter D and elongation λ, that is, the ratio of body length 1 to diameter d (λ \ u003d 1 / d). The elongation of most models of rockets is 15-20. Based on this, you can determine the size of the paper blank for the case. The width of the workpiece is calculated from the formula of the circumferential length l \ u003d πd. The resulting result is multiplied by two (if the body of two layers) and added 10-15 mm per degree of seam. If the mandrel is Ø21 mm, then the width of the workpiece will be about 145 mm.

You can continue more easily: wrap around the thorn thread or strip of paper twice, add 10-15 mm, and it will become clear what the width of the blank should be, in case it should be. Note that paper fibers must lie along the mandrel. In this case, paper without FUBS is twisted.

The length of the workpiece is calculated by the formula 1 \ u003d λ. d. Replacing the known values, we get L \ u003d 20 * 21 \ u003d 420 mm. Wake up the workpiece once around the mandrel, the remaining piece of paper will wake up the glue, let it dry a little and wrap the second time. You have a paper tube which is the case of the model. After drying, clean the flat emery paper seams and the remains of the glue, cover the case Nitrocel.

Now, taking a normal round pencil, wrap a tube 50-60 mm long in three or four layers. Give it dry, cut the knife with a width of 10-12 mm on the rings. They become guided rings.

The form of stabilizers can be different. The best traditionally account for where about 40% of the area is behind a cut (lower) part of the housing. However, other forms of stabilizers give a margin of stability, since the elongation of the model is λ \ u003d 15-20.

By choosing the shape of the younger stabilizers, you can make a pattern out of cardboard or celluloid. On the template, cut the stabilizers from plywood with a thickness of 1-1.5 mm or veneer (the smallest number of stabilizers - three). Fold them in a pile (on top of each other), secure them in the vise, and handle the file by the edges. Then round or sharpen all the sides of the stabilizers except that they are glued together. Clean your flat emery paper and stick to the bottom of the case.

The head cover is desirable for lathe sharpening. If there is no such option, use a knife to draw it out of a piece of wood or cut out the foam and treat a file with a file and emery paper.

Parachute, tape or other devices are used as the system of salvation. The tape is easy to do (see description of the model of the rocket "ZENIT"). How to make a parachute explain more.

The dome must be cut out of lightweight fabric, tissue, or micalent paper or some other lightweight material. Stick to IT slings as shown in the figure. The dome diameter for the first models is better 400-500 mm. The stage is shown in the picture.

(This method of laying a parachute is very suitable for clad domes or out of the film. At the same time, too thin a film may be raised and not revealed in the stream, so consider the parachute operation carefully, if not in the selected material. If you very much use thin loops, make sure they are not loosened when laying revelations.).

All models are ready. Build now. Head fairing connect the rubber thread (shock absorber) to the upper part of the case of the rocket model.

The free end of the parachute rings attached to the head cover.

So that the model can be easily seen against the sky, it is colored in a light color.

Before we put the model on the market, let's analyze it flying, catch it if our first launch is successful.

Stability model

One of the complex tasks of both large missile equipment and small, stabilized stabilization is the resistance of flight along a given trajectory. The stability of the model is the ability to return to the equilibrium position, adversely affected by any external force, such as a windbust. In technology, the model must be stabilized in the angle of attack. This is the name of the angle that is the missile's longitudinal axis with the direction of flight.

One of the ways to ensure that the stability of the model is aerodynamic is to change the aerodynamic forces on it in flight. The aerodynamic stability depends on the position of the center of gravity and the center of pressure. They each mean. t. and c. d.

With the concept of c. t. Meet the class of physics. Yes, and it's easy to pinpoint - by balancing the model on a Sharp dealer, for example on the edge of a thin line. The center of pressure is the intersection of the resulting aerodynamic forces with a longitudinal axis of the rocket.

If c. t. Rocket is behind C. D., the aerodynamic forces, which result from the change in the angle of attack under the influence of the disturbing forces (wind cloud), creates a moment that increases this angle. Such a model will be unstable in flight.

If c. t. Located in front of C. D. When an angle appears, the aerodynamic forces create a moment that returns the rocket to the zero point corner. Such a model is stable. And the more c. d. Indicates relative c. t., the greater stability has a rocket. Ratio of distance from c. d. up to c. t. The length of the model is called the stability reserve. For rockets with stabilizers, the stability margin should be 5-15%.

As mentioned above, c. t. Models find it easy. It remains to determine the c. D. Since the calculated formulas to find the pressure center are very complex, we will use the simple way to find it. From the homogeneous sheet (cardboard, plywood) cut out the shape along the contour of the rocket model and find C. t. This flat shape. That point is C. C. d. Your model.

There are several ways to ensure the stability of the missile. One of them is shifting C.D. to the tail of the model by increasing the area and location of the stabilizers. However, it is impossible to do this on the finished model. The second way is to move the center of gravity forward by weighting the head cover.

After you've spent all of these simple theoretical calculations, you can ensure a successful start.

Single stage model of the rocket with parachute

The body is two layers of drawing, glued with a carbon glue with a mandrel with a diameter of 22 mm. In the lower part of it, the clip is fixed under the motor.
Guide Rings - From four layers of the drawing paper, the rumble for them is a round pencil with a diameter of 7mm. Three stabilizers made of plywood with a thickness of 1 mm are glued to the bottom of the case with nitroleum bushings.

The head covering is sharpened on a birch lathe and connected to the rubber thread housing.

Parachute dome round, with a diameter of 500 mm, made of a micro-paper. Sixteen 10-thread loops on the head cover.
The entire model after assembly is covered with three layers of Nitrolaca and painted with strips of Nitrocrase of black and yellow. Mass models without a motor 45

"ZENIT" rocket model

This model is designed for the "descent on the belt" competition, as well as the height of the flight.

The case is glued to a 20.5 mm mandrel made of paper. Stabilizers - from plywood. Head covering - from Linden.

Tape size 50x500 mm made of microfiber paper. One of the narrow sides with a shock absorber (rubber thread) is attached to the housing.
Mass models without a motor - 20 g.

If you do not have the ability to get original rocket motors, you can experiment with homemade ones (don't forget, of course). Instead of a homemade motor, you can use rocket fieverworks, hunting or rescue raging cartridges.

Source "Model Designer"

How do you ensure a reliable and trouble-free landing of rocket models? Many models suggest about solving this technical problem. According to statistics, more than half of the models break down after relegation. However, there is time when experience is acquired, but all the most diverse methods of rescue models are used.

And while we still hope for a parachute, work on creation and other rescue systems continues. This is largely determined by the fact that there are multi-stage models, model copies of spacecraft carrier rockets: there are many conclusions and time on their manufacturers.

One of the mandatory requirements of the "Rules for Rocket Modeling Competitions" is the descent of the steps to slow down the device. Band parachutes began to be used. Even international competitions are held abroad for the duration of the descent of the rocket models on a tape of 50x500 mm. In competitions of models for the duration of descent on a parachute, Soviet models achieved high results - more than 20 minutes.

In the Moscow region, they decided to complicate the competition for the duration of the relegation - for the first time began to hold starts in several tours with a limited number of models. Such an order led to the fact that the needs "plant" at a certain point in time, and their judges deliver to control.

The output from this template may consider the use of the timer as leading modellers. It should be noted that for the first time a primitive timer (glowing wick) was used by the Gomel Rocketother in 1970 in the all-union competitions in Zhytomyr.

1 - engine compartment, 2 - sleeve of the engine compartment, 3 - nichrome thread, 4 - cover, 5 - simulation wedge, 6 - parachute manhole sleeve, 7 - parachute compartment, 8 - shock absorber, 9 - parachute.

A trouble-free landing is the number one problem for rocket models that make model copies. They show the attacks, very similar to the flight of prototypes: tool in the steps, separation of side blocks. To start over, it is necessary to ensure a reliable fit of the model.

Interesting work in this direction is being carried out in the circle of rocket models of the branch of the TSSU Latvian SSR. We believe that the proposed developments are of interest to readers.

Analyzing the reasons for rejection systems has prompted us to develop and try several new options. Most interesting is the rescue of the lateral launcher blocks - shown in Figure 1.

The side unit in the area of ​​the placement of the chipfout is cut into two parts: the bottom - the engine compartment, the upper parachute. They are separated by a lid which is inserted into the sleeve after the sealing screen after the sealing screen is placed in the upper part of the side block. The upper and lower parts of the sleeve glued in the lower part are connected (connected). The docking space of two parts is closed by a simulation piston made in the form of a paper strip, half of which is glued to the parachute compartment, and the second way hangs over the line of the connector that closes it.

The system works as follows: at the end of the operation of the side blocks of the side blocks, they are separated from the central block of the second stage, and after a second (namely, such a moderator must) a desired charge. The top part flies together with the cover of the pod, but the chrome threads slowly slow down the movement, causing the cover and parachute to pull off.

Now let's analyze the design of the rescue system of the first stage in the example of the "Cosmos" rocket. As can be seen from Fig. 2, an oval hole is cut on the side surface of the cylindrical housing where the container is glued. Outside the container is closed with a lid which is tightly adjusted by its circumference and held in the container. The cover is glued to the body by the thread so that if the parachute is not lost. The firing mechanism itself is similar to a slingshot with the only difference being that it shoots a parachute.

1 - case, 2 - container, 3 - cover, 4 - parachute, 5 - farm of the first stage, 6 - second stage, 7 - bead, 8 - remote slide, 9 - thread, 10 - bracket, 11 - slag rubber.

The design of this mechanism is as follows: two gums are mounted opposite each other in the parachute container at a distance of up to 1 mm from the introduced mound cover at a distance of up to 1 mm. Parachute slings are tied to the place of the intersection of the elastic bands from the outside, and with an internal thread (0.5 mm fishing line), which passes through the holes in the bracket attached to the missile housing and is indicated to the outside.

The bracket needs to install the gum in order for the gum to take place from the removed tube. At the end of the thread you can tie a bead so that after dusting with the second stage the rocket along with the thread along with the thread along with the thread was conveyed between the casing of the second stage and the farm. At the same time, the length of the thread should be such that the gums are in a stretched state. Now you have to fold the parachute and place it in the container, close the lid - and the model is ready to take off. After dusting the steps, the thread frees the rubber she was storing and parachuting. This rescue option is suitable for model specimens in that the well-built container cover does not interfere with the general view of the model and does not interfere with copying. Please note that the cover of the cover in the container was not too bad. The system can easily be checked without working machines.

And another option of redemption of the first stage of the model copy, in which there is no place to install the container, that is, the case when the diameter of the rocket case is larger, that the diameter of the engine compartment is only a few millimeters. Docking circuit and comparative dimensions of the stage in the example from ZURA (Fig. 3).

A - starting position, B - the moment of revelation of the parachute. 1 - fall, 2 - motor, 3 - tube, 4 - parachute, 5 - stubborn ring, 6-7 - guide sleeves, 8 - restrictive ring.

In this case, the place to be installed, which will install the parachute, is only available in the annular gap between the fall of the missile and the motor sleeve.

The design of the rescue system is as follows. The motor is located in the housing inserted into the tube, on the ends of which the guide sleeves are glued. The thrust ring is attached to the base on the inside surface of the housing. It is best to make a ring of duralumin d16t. It does not have to be inserted until after the housing with sleeves is inserted. The parachute is tied to the tube and stacked in the annular gap between the halyard and the tube. The restrictive ring can act as a stop ring to prevent the motor drive. So that the socket moved easily into the case, soda in its paraffin. To start, the stage is prepared like: you have to pull the hose outwards until it stops, insert the parachute into it, then carefully so as not to break the parachute, in the event you install the motor. After installing other steps, you can start the model. As soon as the engine earns the second stage, an increased pressure is formed above the sleeve, which pours the pipe with a parachute parameter. At the same time, the sleeve strengthens the stubborn ring. Parachute coming from the zone of the region will open. At the same time there is a dusting of steps. The movement of the tube is instantaneous, in conjunction in which the punch of the sleeve on the ring can cause the parachute compartment to recoil back into the housing. Therefore, the mating surfaces of the bushings and the rings are made by cones so that the parachute does not catch the edges of the ring first, in order to reduce the vertical component on hit and thirdly, to reduce the extreme position of the parachute compartment due to the "intersection" of the sleeve in the Ring. However, this system works safely, but it is necessary to properly lay parsois. Do not wrap the engine compartment with pins. Multiple tests begin - and trouble-free operation of the proposed system is guaranteed.

I. Romanov, engineer

Source unknown


The rocket fuselage consists of a sheet of A3 office paper with an epoxy resin. Despite the small thickness of the wall of the hull (0.5 mm), sufficient strength and rigidity of the entire structure is ensured. The sheet is smeared with a thin layer of epoxy resin, wound on a metal mandrel with a diameter of 21 mm, pre-covered with a paraffin layer. To prevent the wound paper from twisting, the edge should grip the scotch strip in 3 - 4 places. After screwing the resin, the mandrel is heated and the body tube is easily removed from the mandrel. All drums and irregularities are processed by the skin.


Stabilizers are cut from a sheet material with a thickness of 0.7 - 1 mm, sufficient strength. Such a material can be duralumin or textolite. The fixing places of the stabilizers are marked on the fuselage, and stabilizers are fixed with scotch in accordance with the marking. A drop of epoxy is applied to the contact of the stabilizers with the hull. If rejected, the epoxy is removed. The place of connection of the stabilizer and the hull is noticed by a very thick smear, made of alabaster and epoxy. This putty should be such a density so as not to flow from vertical surfaces. When the mask clears, it is necessary to remove all drums and treat any irregularities.


Rings consist of a strip of office paper, 15 mm wide, like the body, on a mandrel with a diameter of 8 mm. The pair of rings is glued strictly on the same line to the hull through epoxy wood.


The cladding is made of wood. It is better to use solid wood wood. You can pull the segment of a large screw in the cartridge of a drill bit and talk to it.


Parachulate with a diameter of 400 mm is cut out from a thin tissue. If the fabric is HB, the edges of the parachute should be overlocked. If the fabric is synthetic, the edges can easily become dirty. All loop and thread are made by adding multiples of the HBs to the HBS impregnated with a solution of silicate glue in water 1: 1 with a solution of SILATE 1: 1. Parachute with fuselage rocket must be connected with a rubber cord. When picking up a bad charge, the rubber cord does not surrender to the threads. Rubber line can fish.


The motor is made from a 12-caliber case. On the mandrel with a diameter of 16.5 mm, a strip of office paper 65 - 70 mm wide, 210 mm wide of PVA adhesive. It will be a booster booster. It is necessary to protect the outer surface of the fuel checker from burning and destroying the fuel tester itself. This can happen when the case is inflated due to the working pressure. After the adhesive has dried, the resulting paper tube must be freely inserted into the caliber sleeve 12. It takes the clamp made of 0.5 - 1 mm steel, an inner diameter equal to the outer diameter of the sleeve. The clamp is required so that the sleeve is not inverted when the fuel is pushed. You still need a bait and nail 4-5mm in diameter.

In the picture:
1 - membrane; 2 - desired fee; 3 - connector; 4 - tight bandage; 5 - transition hole; 6 - moderator; 7 - booking; 8 - fuel; 9 - housing.

Manufacture of fuel

A mixture of 60% potassium nitrate and 40% sugar is used as fuel. Nitrate potassium recently it was possible to buy in the store for gardeners, he sold there as fertilizer - a potash saltier. Now it's a deficit. Therefore I will give the method of its independent manufacture. Potassium nitrate is formed in the conversion of potassium chloride and ammonium nitrate, both of which are very common ammonium nitrate fertilizers and potassium chloride. In 220 ml of water at a temperature of 30 years, how much potassium chloride will dissolve will dissolve. When dissolved, the temperature will drop somewhat, so the solution must be heated, but not higher than 33c. The resulting saturated solution, drain from the sediment, warm the degrees to 70 ° C and filter. The filtered solution must be completely transparent and blunder. Heat it up to 70s and add 100 g of ammonium nitrate. Mind to complete dissolution. Put the solution in the freezer and cool to 0c. The sediment will fall potassium nitrate crystals. Solution runoff of crystals. Crystals are associated with a very small amount of icy water. Envy. After drying, potassium nitrate rubs in a porcelain mortar as a magnica. Grate sugar separately. With 15 g of powdered potassium nitrate, add 10 g of powdered sugar. Mix very thoroughly. Fuel is ready.

Press tank

The case stuck into the claw and put in the booking. The booking will twist a little from the sleeve, making it easier to press. By installing the sleeve along with the bracket on an even solid base, fuel in bulk. Fuel should be added gradually, in small portions. After each part we put in the bait and hit the hammer on it. The first punch shouldn't be strong.
The final blow should be used very hard. The strengths gradually increase from the first to the last. Total requirement 10-15 shots with a hammer. So don't be filled with the pod, leaving 1 cm. After that, the drill with a diameter of 3 mm drill part of the fuel through a nozzle to a depth of 30 mm. The NABBER is inserted into the sleeve and the sleeve with the bait turned over, causing the needles to rest on the base. Insert a nail into the nozzle and tap with a depth of 40mm. It is important to ensure that the nail can enter the motor axis without distortion. After that, after that, with the help of the passage of the nail, we remove that it is easier to remove the nail if it is turned slightly. The protruding reservation is neat so as not to damage the sleeve, cut and erase the scalpel. The ends of the fuel checks line up with a scalpel as well. Remove the bracket. On this pressing ended.


The plug is made of wood, and there is no particular difference from what I usually did from pine. Every available method makes a cylinder, 18mm long by 30mm. From one end drills a hole with a diameter of 8 mm to a depth of 20 mm. So with this hole you drill another hole on the other side to a depth of 6mm. Holes connect with a hole 2mm in diameter. From the side of the short hole around the circle of the cylinder, retreating from the edge by 4 to 5 mm, we draw the rough edge of the groove to a depth of 1 mm. We create the composition of the moderator, mixing 53% potassium nitrate, 22% sugar and 25% epoxy resin, diluted with hardener. After stirring, the short hole in the plug is filled with this composition. Drilling with a diameter of 2 mm drill a slower composition through the entire cap from the side of the long opening so that the thickness of the layer of the moderator is 2 mm.
In the mortar we rub a small amount (not more than 100 mg) of the hunting black, powder and fall asleep in the transition hole, something trambam. 0.4-0.5 g hunting, black powder I fall asleep in a long hole, and we rush to a sheet of paper. The connector is ready.

Motor assembly

The plug in the place of the groove is smeared with epoxy resin and inserted into the sleeve. In the place where there is a protocass on the plug, with an effort we sweat a few turns of the kapron thread so that it creates a sleeve. Tie a thread and also smear epoxy resin. When epoxy packs, the engine is done.

Surely each of us did and launched a water rocket at least once. Homemade like this is good because it is quick and does not require fuel like porch, gas, etc. The energy for launching such a rocket is compressed air, which is pumped by an ordinary pump. As a result, water comes out of a pressure bottle, creating reactive traction.

The rocket discussed below is made up of three bottles, each size is 2 liters, that is, it is quite a large and powerful rocket. In addition, there is a very simple rescue system in the rocket, which means that the rocket leaves smooth land and does not break.

Materials and tools for homemade:
- plastic carving tube;
- bottles;
- parachute;
- plywood;
- tin can from canned food;
- small engine, gearbox and other small things (to create a rescue system);
- Power supply (battery or battery from Mobile).

Tools for work: Scissors, hacksaw, glue, threaded screw and screwdriver.

We're going to create a missile:

Step one. Build the rocket.
Three two-liter bottles were used to create a rocket. Two bottles in the construction are combined with a neck to neck, a cylinder made from an empty plastic gas made as an adapter for the connection. Details sit on glue.

As for the second and third of the bottle, they are attached to the bottom down. A carving tube and two nuts are used for the connection. Attachment points are well sealed with glue. To make a rocket faster, pieces of bottle are glued to the joints of the joints. A plastic bottle is used as a tip. As a result, the entire design is a single slim cylinder.

Step second. Rocket stabilizers.
In order to take off the missile vertically, it is necessary to make stabilizers. The author makes them from plywood.

Step three. jet

The nozzle is made a little less than usual when only a neck bottle is used.To make the nozzle, the cover is removed from the bottle and the hole is cut in it. As a result, water goes wrong.

Quarter step. Pad
To make the pads, you will need a sheet of chipboard and two metal corners. A metal bracket is used to hold the rocket, it holds a rocket for the neck of the bottle. When the mount is launched, it is pulled out with the help of a rope, while the neck is released, the water pressure is formed and the missile goes out.

Pitch fifth. The last stage. Parachute device
The parachute system is very simple, there are no electronics here, everything is done by mechanics on the basis of a primitive timer. In the photo you can see what the parachute looks like when it is complicated.

The parachute compartment is made of a tin can. When the parachute needs to be revealed, the special spring displaces it through the door in a tin can. This door opens with a special timer. The photo is fashionable to see how the slider is arranged with a spring.

If the parachute is complicated and the missile has not yet started, the parachute compartment door is closed. The timer continues to work in the air, opens the door, the parachute is moved outside and is revealed by the flow of air.

For the parachute timer device, it's very primitive. The timer is a small gear with a shaft, otherwise it is a little swan based on an electric vehicle. When the rocket takes off, a meal immediately enters the motor and it starts spinning while the thread is wound on the shaft. When the thread is fully wound it will start pulling the latch on the door and the parachute compartment will open. The gears in the photo were created manually from a file. However, you can already use toys, hours and so on ready to use.

That's all, homemade is ready, you can see how it all works. Right, it shows the start without parachute.

According to the author, the homemade one turned out not to be particularly productive, that is, the rocket decreases about the same height as the usual bottle. Here, however, you can experiment with the air pressure inside the rocket.