Before to start to build cord model with a mechanical drive, it is necessary to make cord model of a glider and to learn to operate on it in flight.
The model is very simple in manufacture, does not demand what or expensive materials. After fixed training, on model it is possible to execute normal loops, flight on a spin and outside loops.
Except for all listed during trainings the vestibular apparatus of an aeromodeller and as a result at the last the head is less turned trains.
Manufacture of model
The model is made bodily of an aspen or any other mild tree. For a wing the dry board of the lengthy of 900-1000 mm and a breadth of 120 mm undertakes. Thickness covered 6 mm. Therefore the board needs to be chosen is more thin. If there is a capability to saw off on a circular saw a plate thickness of 10 mm. The wing should have convexo-plane a structure. Thickness in an attachment point to a fuselage - 6 mm, on the extremities - 4 mm.
The wing completely is treated by a plane and carefully trimmed by a sandpaper pasted on the thin plate. On an interior (left) blade the ringlet for a cord from a steel strand in diameter of 1 mm hardens. The ringlet should be reinforced closer to a leading edge.
The stabilizer and elevator are made of pine plates 320 x 35 x 3 mm. Plates are done to the extremities is more thin (2 mm), are treated under the form and on a structure and carefully trimmed by a sandpaper.
To an elevator from above ïðèêëåïûâàåòñÿ a horn rivets from an aluminium strand thickness of 2.5 mm. The fuselage is made of a pine bar 530 x 18 x 8 mm. First to label attachment points of a wing and the stabilizer. The fuselage from a trailing edge of a wing is narrowed down up to 10 x 10 mm on the extremity. Then the cut-out on a structure of a wing is done from below. The fuselage should have in a nose round section, above a blade semicircular, and in a caudal part triangular section with a platform from above for strengthening the stabilizer.
The rocking chair and horn with a plate are done of duralumin by thickness of 1 mm. First orifices are labelled and drilled, then treated under the form. Orifices for thrust of an elevator should correspond precisely to thickness of thrust (in the best way for thrust to take a bicycle spoke. The orifice in center of a rocking chair should coincide precisely on diameter with thickness of a screw, and orifices in a horn and a plate for rivets should be peer to thickness of rivets. All this is necessary that in a control system there were no backlashes. To operate model in flight with backlashes very difficultly, and with big it is not possible.
Assembly of model
Assembly of model begins with an attachment of the stabilizer to a fuselage. For this purpose to smear conjunction with glue and two small-sized carnations to beat the stabilizer. Threads proofly to attach the stabilizer to a fuselage (so that there was no cross neither from above, nor from below), and to miss the mark glue. The elevator is stuck down to the stabilizer behind by means of eight scraps of the thin and strong tissue (silk, capron) or sewn by strong threads in four places (in center and on the extremities).
Scraps of a tissue are stuck down pairwise (one from above, another from below) in the places indicated on the stabilizer. By means of clothespins the elevator joins the stabilizer. Scraps of a tissue are stuck down to an elevator. Which have been pasted to the stabilizer from above, to an elevator are stuck down from below, and lower are stuck down from above. After a desiccation of glue of a clothespin are taken out.
The elevator can be sewed threads. For this purpose it is necessary to pierce an awl in the necessary places of an orifice and a needle with a thread to sew a control surface to the stabilizer eights.
The rocking chair is attached by a screw to a fuselage from above on 40 mm back from a leading edge of a wing. Under a rocking chair to enclose a spacer thickness not less than 2 mm that the rocking chair at deviations did not touch a fuselage. To put thrust of an elevator so that at a neutral rule of a rocking chair an elevator stood in a neutral rule. Thrust from a bicycle spoke. The elevator should be wedged upwards and downwards on 35o. If the control surface is wedged less, to rearrange thrust on the lower orifice of a horn. To bend thrust so that a rocking chair did not touch it.
The wing is attached to a fuselage by a rubber tape (it is possible to cut from the bicycle chamber). Hardly covered to fix it is not recommended, as at impacts it is fractured.
Cords in length of 5 m two pieces. Are attached by one extremities for a rocking chair, both are passed in a ringlet on the left blade, by other extremities are attached to a lace on a control handle. Moving a lace, it is possible to adjust length a cord that were identical longwise. Cords - a fishing fishing-line 0.8 - 1 mm. That at landings did not abrade about the ground rubber and a thread it is possible to put on model a single-strut landing gear and behind a skid from a strand.
To start model it is necessary together. The pilot «on the handle», and the assistant starts model. The pilot should crank all time model («to drag») completely prolated arm. To operate model it is necessary continuously double motions (has yielded - has cleaned). Having mastered control of model in horizontal flight, it is possible to pass to normal loops. For fulfilment of a loop model to untwist «before singing» (to untwist it is possible only at a neutral rule of an elevator). Elevator to reject continuously upwards it is simultaneous all arm "to drag" model (an arm all time ahead of model). The most complicated element is inverted as control surfaces work in a back side (the handle to overturn it is impossible). Accustoms long training.