BORNE BY THE WINDSDid you know that there is a model yacht, which with equal success can do and experienced athletes, and beginners? This sailing catamaran belonging to the class DH. The model is simple, adaptable, and to build it without the use of scarce materials. High seaworthiness and good speed catamaran gives the hull type hulls “sharpies”. You can get them in several ways — with the use of plywood sheathing and a set of longitudinal and transverse elements, with a slinky frame paper and cloth, or — most simple — Villenoy of fiberglass on the disc. Get acquainted with the first two.

Each of the housings has a length of 1000 mm, and for frames from cook pine slats of the longitudinal framing for the entire length of the body: four section 5X10 mm and eight cross-section of 5X5 mm. the Outline frames (1 through 9) carefully transfer the drawing to the plywood thickness of 2.5 mm and cut out parts with a jigsaw. The slot under the elements of the longitudinal set is best to mark in the finished frames. Knife-like aft edge of the hull (the outline shown on the drawing) — 5 mm plywood, a fore end — of the same material.
Before keying grooves in the frames under the rails of the longitudinal framing is necessary to decide what will be covered the case. If paper, then the outline of the frames should understate 1 mm below the transverse “ribs” on the skin did not increase the hydrodynamic resistance of hulls.
Assemble the frames on a flat Board stocks. Pre-cut wooden churbachki size 20X20X15 mm: they are useful for fixing on the stocks of the frames and ends of the hull bow and stern. Installing cross set, another rose verify the location of the elements to the lengths of the buildings. Making sure everything is in order, proceed to the gluing of longitudinal set. It is best for the job suitable adhesive based on epoxy. The next day, when the glue finally polimerizuet, you can do Vykurovanie frame and fine-tuning of the shape of the bow and stern extremities.
For sheathing, use plywood with a thickness of 1 mm by attaching it to the set of epoxy, but you can do without this scarce material, replacing it with paper and cloth.
First to the frame glue a layer of thin wrapping paper, pull it, sprinkle with water. For subsequent layers will require heavier paper, cut it into strips width-Noi of about 4 cm. total thickness of plating is six layers, and the tape of the even layers are mutually hiding behind, forming an angle of 45° with the longitudinal axis of the housing and the odd strips are perpendicular to the first. Before placing the last layer, it is desirable to lay a layer of cloth (gauze). Connecting with the skinny — nitrogly AK-20, although you can use and enamel.
When the glue is completely dry, remove the casing from the pile and remove the mounting churbachki. Carefully marked out, saw the keel beam, the grooves and install them in the keels. The last cut of duralumin sheet thickness of 1.5 mm or plywood with a thickness of 2.5 mm. Into the ribs 3 and 7 stick beech lugs cross-section 15X15 mm, driving them around the shape of the deck. It remains to consolidate between the frames 8 and 9, the ballast (80 g in each case) and ulcerate all internal surfaces. Now proceed to the wrapping deck.
This operation is similar to the pasting of the bottom and sides, only there’s four layers of paper (between the third and fourth layers be sure to attach the fabric).
For the connection of the buildings used Reiki section 10X12÷15 mm from wood of firm breeds. Their ends will zakruglenie. On the bosses of the 3rd and 7th frames strengthen the seizure of the strips of aluminum with a thickness of 0.5 mm, which is in the middle of the Assembly with cross drill holes Ø 2 mm for studs locking compounds.
The longitudinal beam of the same timber has a cross section 10 X 15 mm. it is a mast installed and automatic heading control. The cross beam is attached tin plated M3 screws with nuts and washers. Automatic control of the conventional construction, the deviation of the sails of the steering device is transmitted to the rudder through gearing.
Both mast and boom are made of pine. For the sails you can use Mylar or plastic wrap. First it is necessary to turn over after cutting around the perimeter with adhesive tape tape width of 8 mm, the second loop to tuck in two layers and “soldered” with the help of a roller, mounted on a soldering tip. So well made and pockets for armor.
Pressureviagra sails to the mast and geeks nylon fishing line, flowy angle is attached to the fittings located 40 mm from the top of the mast.
The rigging is nylon fishing line of 0.5 mm Ø don’t forget about Vatutinki on the left and right housings are required for the fixing guys. The same detail and on a longitudinal beam.
Shown in the drawing sailing rig is designed for strong wind. If you weak best to use sails larger. However, we must remember that in total it should not exceed 0.5 m2.
Exterior finish is as follows. The hull, mast and geeks, the crossmember and the longitudinal beam after viskazivaniya painted in the main color. For more proskurivka should be a new color. Perhaps these operations will have to be repeated several times. Finally if you are satisfied, apply the remaining color elements and cover all parts of the model with two layers of colorless synthetic glossy varnish.
Adjustment spend catamaran with an average constant wind. Having estimated the angle between the boat and the wind direction, mentally divide it in half. And install the mainsail. Sail machine gun of course is the wind, rudder — at the rate model.
Due to the large distance between the hulls of the boat steady and in a strong wind. However, do not interfere, and the ballast mass 200 g is hung at the end of the windward keel.
Ya VLADIS, engineer

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