Jimmy Building Instructions Modified Rbckits-Books Pdf

JIMMY Building Instructions modified rbckits
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Building Instructions JIMMY Page 2 of 20,Start with building the fuselage. Pick the side panels up and lay,them on a plastic sheet to. prevent them from sticking to,your work surface Glue the. balsa side panels to the ply,parts using the zigzags to align. them Check the picture below,for their orientation.
Lay down the bottom panel Note,that the front is not square but at. an angle to the right This will,offset the propellor thrust. direction to the right which is,necessary to compensate for the. air flow twist caused by the anti,clockwise rotation as seen from. the front of the propellor So,check that the right hand edge of.
the bottom panel is shorter than,the left hand edge. Building Instructions JIMMY Page 3 of 20,Glue the main former to the bottom. panel make sure it sits square to,the bottom,Glue the servo mounting plate to the. rear former check the squareness,again the rear former differs slightly. from the picture,The stabiliser support balsa and tail.
skid support ply parts are glued to,the right hand side panel. Building Instructions JIMMY Page 4 of 20, Glue the assemblies as prepared in the previous steps to the right hand side panel. Before the glue sets glue the left hand side panel in place and ballast the complete. assembly with a weight of your choice The bottom picture shows the tail end glued. together don t do this as yet as this will be explained in detail in the next steps. An old iron as shown in this,picture of another model. under construction is perfect,Building Instructions JIMMY Page 5 of 20. Mark the center of the two formers with a vertical pencil line and. line them up by sighting the two pencil lines and glue the side panels together ensuring. their symmetry by aligning the stabiliser support slot with those lines. Building Instructions JIMMY Page 6 of 20,Complete the nose The side panels first the.
shortest one on the right Apply glue to the,teeth and on the side of the bottom panel. Slide the teeth into those on the fuselage,sides and swing the sides inwards to close. the joint with the bottom panel Clamping may,be a bit difficult so use pins or tape to fix the. Glue the captive parts for the landing,gear leg ends to the sides Orient the. parts such that the slot corresponds,with the opening in the bottom panel.
Clamping will be a bit difficult fix the,parts with pins or sand a bit of balsa. scrap to size and push it between the,parts Keep the slot and the bottom. Use the mounting cross included with,opening free from glue any excess. your motor to establish the correct,should be removed with a matchstick or. position of the self tapping mounting,similar to enable sliding in the L G legs.
screws Center the cross over the,from below,hole in the middle of the firewall mark. the mounting holes and pre drill the,holes with an appropriate size drill. Screw the cross in place temporarily,do not over tighten the screws. Unscrew it again When available,harden the screw holes with thin. cyano glue alternatively glue some,scrap plywood pieces on the back.
side to provide more flesh for the,screw thread Dry fit the firewall. Slightly bevel the recessed surfaces,of the side and bottom panels to. provide a nice fit of the gluing,surfaces but do not overdo it to avoid. altering the side and down thrust,angles of the motor propellor Glue. the firewall in position,Building Instructions JIMMY Page 7 of 20.
Glue the front part of the nose top in,place and sand it to shape after the. glue has set Sand the rear part to size,but do not glue it to the fuselage This. part serves as battery and motor,controller access hatch and should be. kept removable, Dry fit the control cable support in the rear end of. the fuselage Slide the outer control cables,through the holes in the rear former and the rear.
support The rear end of the cables should just,protrude from the fuselage the elevator cable. through the opening at the rear of the fuselage,and the rudder cable through the top accounting. for the 1 5 mm top planking of the fuselage still to. be fitted The front end should protrude some,10 15 mm through the holes in the rear former. Check the drawing for the exact routing of the,cables and glue everything in place It is. important to run the rudder cable in such a way,that the steel inner cable only needs a minimum.
of bending on its way to the rudder control horn,Glue the top and bottom planking of. the fuselage with the grain direction,across Fix with dress pins Start at. the front with a slightly oversized,piece and continue to the rear by. holding the balsa sheet against the,previous piece mark the size with a. pencil cut slightly oversized again,and glue in place Maintain 2 3 mm.
oversize and sand flush with the,fuselage sides later. Building Instructions JIMMY Page 8 of 20,Prepare the 3 mm balsa tail surfaces but wait. with glueing those to the fuselage until after,the iron on covering has been applied Glue. the two pieces of the tail fin together sand,smooth and round the front and top edges. The rear edge shall remain squared since this,is where the rudder hinges.
Sand the stabiliser smooth and round all edges except the rear edge the elevator hinges. Bevel the front edges of the rudder and elevator parts at an angle of approx 40 degrees. to allow deflection to either side no picture see drawing. Glue two 50x8x2 mm pine pieces to the fuselage bottom. on either side of the removable landing gear To adjust. their position temporarily slide the L G legs into their. mounting holes with the wires against each other apply. glue to the pine parts position them close to the L G wires. and slide these against the wires while the glue is still wet. Remove the legs carefully without moving the pine parts. and remove any excess glue, Glue the 3 mm ply tail skid directly to its ply support after. making a slot in the balsa planking that covers it no. picture see drawing,Finally add a strip 3 mm balsa to. the inside of the fuselage sides at,the wing rest and bevel these to the. dihedral angle of the wing to give it,a larger supporting surface This. does not add any strength or rigidity,but it avoids indenting the wing.
bottom surface,Building Instructions JIMMY Page 9 of 20. The wing will be built on top of the drawing so start by getting a building board made out. of a piece of mdf or,chipboard of sufficient size,for one half wing Stick the. drawing to the building board,with tape and cover the. drawing with transparent,plastic sheet to prevent,glueing the parts to the. drawing As an alternative,you can cover the drawing.
with tape where parts will be,glued together and touch the. drawing i e all ribs to the,lower spar and to the trailing. edge The leading edge will,stay clear of the drawing so. no need to protect the drawing there, Fix the 6x6 mm lower spar to the building board with pins Accurately cut a piece of 1 5. mm balsa to size for the planking of the root part and glue it to the lower spar Fix this. planking to the building board with pins The trailing edge consists of a lower and an. upper part made from 1 5 mm balsa sheet Cut the lower part to size and glue it to the. rear edge of the planking and fix the rest of it with pins Ensure that the lower trailing. edge sits flat on the drawing board and exactly matches the spanwise lines on the. drawing a little oversize on the ends is ok,Glue the 9 outer ribs 2 mm balsa to.
the lower spar and the trailing edge,in the positions indicated on the. drawing Ensure that the ribs stand,square to the building board and that. the bottom edge of each rib rests on,Building Instructions JIMMY Page 10 van 20. Check the fit of the upper spar in the,ribs The fit should be tight but not. overly so Adjust the cut outs in the,ribs where necessary Glue the upper.
spar in position,Now for a slightly tricky bit the root ribs. are in two parts each a front and a rear,part They are glued in a sequence. combined with the wing dihedral brace,front parts first then the brace and lastly. the rear part An extra complication is that,the first root rib has to be angled so that it. matches its counterpart on the other wing,half Start with the front part of rib 1.
Glue it at the required angle using the 3,mm ply template provided checking. alignment with the drawing by looking,from above Slip a piece of 1 5 mm scrap. balsa underneath to allow for the planking,thickness Check the front cut out. alignment by sighting and comparing it,with the other ribs or hold the leading. edge against it Told you it was tricky,Glue the two other root rib front parts.
in place square and upright Test the,front cut out alignment. Building Instructions JIMMY Page 11 van 20,Glue the 8x8 mm leading edge in. the cut outs of the ribs and,temporarily fix it with pins as shown. in the picture,Glue the ply dihedral brace to the rear. of the spars and to the bottom,planking The dihedral brace dictates.
the way the two wing halves fit,together so ensure that the underside. is parallel to the building board The,kink in the brace should exactly match. the position of the slanted front rib,part If necessary sand a little off the. end of the brace to achieve this Be,sure to clamp the brace to the spars. until the glue has set,Glue the rear parts of the 3 mm balsa.
root ribs onto the bottom planking and,against the dihedral brace The first rib. is again angled at the same angle as,the front part check with the template. and at right angles to the spars,Building Instructions JIMMY Page 12 van 20. Use a plane to shave the bottom,trailing edge to an angle such that. the top trailing edge fits flat in the,rib cut outs and on the bottom.
trailing edge Ensure the top butts,against the front of the cut outs. Glue the top in place and use pins,and clamps to keep it in place while. the glue sets,Cut and sand the last 2 planking,sections to size and glue pin in. place Sand the excess planking and,spars off flush with the slanted first. rib The other wing half should fit,against this,Building Instructions JIMMY Page 13 van 20.
Cut the 1 5 mm balsa webbing pieces,to size These are the rectangular. pieces which are glued between the,ribs to the rear of the spars with the. grain vertical,Shape the leading edge to the,correct cross section The easiest. way is to mark the balsa strip with,two pencil lines 2 5 mm offset from. the front edge and start shaving it,vertically up to these lines After that.
shave and sand to its final shape,Sand the spars leading and trailing. edges flush with the outer rib Glue,the 5 mm balsa end ribs on and. sand the edges to match the last rib,Round off the outer edges. Building Instructions JIMMY Page 14 van 20,The second half wing is constructed. the same way as the first except that,the dihedral brace the rear part of.
the root ribs the top planking and,the top trailing edge are all left to be. completed until after the two halves,are glued together. Support the completed half wing at,the tip with a 120 mm high stack of. books blocks etc and rest the root,on the building board Offer up the. second half and fettle the joint until,you have an exact fit Glue the two.
halves together Be sure to clamp the,dihedral brace to the spars until the. glue has set,Glue the rear root rib parts in place. Glue the top trailing edge and the,1 5 mm top planking in place. To avoid any damage caused by the,rubber bands that hold the wing. down it is best to add two rounded,pine strips at the trailing edge of the.
wing Try the wing to fuselage fit first,and adjust the position of the pine. strips such that they are just in front,of the rear former of the fuselage as. the V form of the wing makes it sink,slightly into the fuselage aperture. Building Instructions JIMMY Page 15 van 20, Wing and fuselage are now ready to get their final finish Sand everything smooth and. round the corners of the fuselage Do not overdo it avoid reducing the glue areas too. much The simplest way to finish all surfaces and open structures is to use iron on. covering film It is important to apply the covering at a low temperature setting of your. iron to reduce initial shrinking and only when everything is attached properly raise the. temperature to tighten the covering and remove any wrinkles This is especially important. with open structures i e the wing which should be covered at low setting on top and. bottom first and only then raise the setting to tighten it evenly Be careful not to introduce. warping of the wing but when you do you can iron those out by counter warping the. wing by weighting one half down on the board and carefully rotate the other tip by hand. reheat the covering and let it cool before you release it. It will be difficult to describe the details of iron on covering in a few words best is to let. an experienced modeller show you how it s done or refer to the instructions of the iron. on film supplier e g Solarfilm Oracover and others. As mentioned before the tail surfaces,are best covered before final assembly.
Leave the area to be glued to the,fuselage free from covering. Mark the position of the rudder horns,cut a slot and glue the horns to the. control surfaces Check the drawing for,the exact positioning of the horns. Attach the elevator to the stabiliser with,sticky tape Stick the tape to the top of. the stabiliser leaving one half past the,edge to stick to the elevator To ensure.
a minimum hinge gap and a maximum,deflection angle hold the elevator in a. downward attitude against the rear,edge of the stabiliser and push down. the tape onto the elevator,Attach the rudder in the same way pay. attention to the bevel on the front edge,of the rudder.


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