About this Plan
Brigadyr. Simple rubber profile scale cabin model.
Quote: "Your full-size plan. A 14 inch wing span, rubber powered, semi-cale, profile model of a Czechoslovakian maid-of-all-work aircraft. Brigadyr, by Ray Malmstrom.
NOT VERY many full-size aeroplanes these days lend themselves to easy reproduction in model form and still fly 'off-the-drawing board.' The little Czechoslovakian Brigadyr, however, proved to be just the job for the simple-to-build profile model we present for your delight, this month. The real Brigadyr is indeed a maid-of-all-work being employed extensively as an agricultural aircraft, and also equipping the Czechslovakian Air Force for observation, photography and parachute duties.
The plan and easy-build sketches of our 14 in span Brigadyr supply all the information you will need to build a 'full-of-flyability' model; but before we go on to the all-important flying notes, one or two points may assist your construction. A sharp pointed knife, or a razor blade cracked in two to give a sharp point, will assist in cutting accurately the fuselage shape. See plan. Note direction of grain for nose pieces and fin. Use medium grade balsa throughout. Retain the undercarriage and rear hook wire with pieces of this tape. Cement well and rub the cement into the material and allow to dry completely. Check when assembling the wing and tailplane to the fuselage that they are true and not twisted.
Decoration of the parts should he done as soon as they are cut from the sheet, and before assembly. We invented a new method of colour application on this model, which avoids heavy dopes or paints, and results in a bright, colourful finish. Possibly in your art periods at school you have used a new form of pastels that are really oil colours in stick form. These are ideal for decorating your little Brigadyr. Simply mask off the area to be coloured with Sellotape (wing tips and leading edges, tailplane tips, fin leading edge, nose pieces and lower part of fuselage on this particular model). Rub on the oil-colour pastel fairly thickly with a soft rag, gently smooth out the colour to get a very pleasing solid-colour effect. It looks good and adds no weight to your model. Try this new method (applicable to all small sheet models), it really works. You can obtain a small box of oil-colours in stick form (one manufacturer calls these oil colour sticks 'Cray-Pas Crayons') from your local art dealers. They are great for painting colourful pictures with too! Elevator lines are easily put in with a ruler and ball-point pen.
Flying notes: Install the rubber motor (one loop 7-1/2 in long, of 1/8 in strip rubber) after having put rubber lubricant (6d a tube from your hobby shop) on the rubber. Balance the model carefully as indicated on the plan. You may need to add a small quantity of plasticine to the nose or tail to obtain correct balance. Choose a calm day for your first flight, and carry them out over long grass. Point the nose of your model into any breeze that may be blowing and launch it gently with nose pointing slightly downwards. Never throw the model. Your Brigadyr launched from shoulder height should glide straight down and land about 20 feet away.
If the model climbs steeply, falls back on the tail, and then dives (stalls), add a little more weight to the nose. If it dives, remove some nose-weight or bend up the rear edges of the tailplane a very little (1/32 to 1/16 in will be enough). Make sure the glide is straight. If the model turns sharply to left or right, check that the wings are not warped. If they are, breath gently on them, twisting out the warp. If there are no warps and he model continues to turn sharply, bend the rear edge of the fin in the opposite direction to the turn.
Once the model glides satisfactorily you can try a 'power-on' flight. Wind the propeller about 150-200 turns and launch gently, releasing the propeller first. Your Brigadyr should climb away, turning slowly to the left. When the power runs out, it should glide in to a smooth landing. With each successful flight you can increase the turns up to a maximum of about 320. Remember to rub some lubricant on the motor after every two or three flights. Stalls, dives or excessive turning under power can be corrected in the same way as we mentioned above for gliding tests. Build and balance your Brigadyr according to the plans and these notes, and you will get many steady flights and happy landings from ihis model."
Supplementary file notes
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by Ray Malmstrom
from Meccano Magazine
all formers complete :)
got article :)
Found online 22/08/2019 at:
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