Air-hydraulic rocket plane. Drawing, description

MODELING
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Air-hydraulic rocket plane. Tips for a modeler

Modeling

The model of a rocket plane equipped with an air-hydraulic engine belongs to the simplest type, but it makes it possible to conduct many experiments and, most importantly, makes it possible to visually get acquainted with the principle of operation of a jet engine.

Modeling should begin with the engine. Figure 1 shows its basic drawing, and the main dimensions - diameter and height - are taken from the table in accordance with the selected type of engine. In our case, there will be engine number 1. Pick up a cylindrical blank with a diameter of 15 mm and a length of up to 200 mm. Take fiberglass, cut it into long narrow strips 10-15 mm wide and sequentially, layer by layer, impregnated with epoxy, wrap the blank.

Drawing of an air-hydraulic rocket plane

The wall thickness of the housing 1 should not exceed 3 mm. From the outside, stick a few more turns of 6 mm wide fiberglass tape on the wall. Retaining ring 4 will be obtained.

When the resin hardens, remove the resulting cylinder from the blank. And to make it easy to do, coat the surface of the blank with a thin layer of mastic before gluing.

Turn the plug 2 and nozzle 3 on a lathe from beech or birch. From the end, the plug must be additionally reinforced with a layer of tapes impregnated with epoxy resin 5. Lubricate the surfaces of wooden parts mating with the engine wall with epoxy resin and fasten as shown in the figure. The engine is ready.

The main material for the manufacture of a rocket plane is paper and pine slats. If you chose engine type No. 1, prepare a cylindrical blank with a diameter of 21,2 mm. Wrap several layers of paper on it, pre-lubricated with glue. Remove the resulting cylindrical shell and glue a paper cone to it. You have a fairing for the engine. Plane the fuselage of the rocket plane from a pine lath. A fairing is glued to its thickened end. And the stabilizer and keel, made of drawing paper, are carefully fixed at the opposite end of the fuselage.

From whatman paper, cut out two planes of the wings and glue them on both sides of the spar - a pine rail measuring 2X8x300 mm. Wings should be slightly bent upwards. Glue the finished wings to the fuselage as well. Now you can start manufacturing the launcher.

Its main unit is a receiver, a container for storing compressed air. In Figure 2a, the receiver is shown in close-up. Take a can of coffee or lollipops, close the lid tightly and seal it properly. Then coat the jar with epoxy and wrap it with fiberglass tapes. The reinforced can can now withstand internal pressure up to 10-12 atm.

Starter installation (click to enlarge)

engine's type	D - internal diameter of the engine	L - maximum length of the engine	The volume of water filled into the engine	Permissible engine pressure
I	15 mm	70 mm	20 ml	3 kg / cm2
II	20 mm	100 mm	50 ml	6 kg / cm2
III	25 mm	150 mm	80 ml	9 kg / cm2

Drill three holes in the bottom, wall and lid of the jar. Insert the nipple from the car cylinder into the bottom one, the pressure gauge from the garden sprayer into the side one, and the metal tube with the dosing valve from the oxygen cushion into the top one. Wrap the joints of the parts with glass-cloth thread impregnated with epoxy resin.

Put a locking plate on the upper end of the tube for a length of 70 mm and solder it to the tube (Fig. 26 and 2c). In addition, you will need a rubber plug and a safety clip. Make the jaws of the clamp from 2 mm thick sheet steel, place them on the locking plate and tie them with a spring.

Install three guides on the panel (Fig. 2d), make plates and racks for them from tin. The guides support the rocket plane at the moment of launch and, depending on the type of engine, they can be rearranged. The receiver, locking plate and rails are fixed in a swivel ring and mounted on a square base (600 x 600 mm) cut from chipboard.

Let's get acquainted with the order of launching the model. Pump the receiver with compressed air using a manual car pump. Its volume is enough for several launches. Fill the engine with water - exactly as much as indicated in the table. Tilt the handset down. Insert the engine into the fairing of the rocket plane, and install the rocket plane on the rails. The motor nozzle should fit snugly on the rubber plug. Grab the support ring with safety jaws and insert a pin with a cable at least a meter long.

Having installed the rocket plane strictly vertically, turn the metering valve valve and fill the engine with compressed air to the pressure indicated in the table. Now count: 5, 4, 3, 2, 1! Pull the pin, and the rocket plane will rush into the sky.

Author: A.Dyuka

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