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- Yak-54S
- Assembly Manual
QuiQue's Aircraft Yak-54S Assembly Manual
Summary of Yak-54S
Page 1
Semi scale yak-54s, arf 73” assembly manual specifications wingspan: 73 in length including spinner: 69 in wing area: 1,060 sq in weight (rtf): 11-12.5 lb radio: 4-6 channel w/6 servos recommended engines: 2-stroke 1.4-1.6 4-stroke 1.4-1.80 gas 26-30cc 1.
Page 2: Table of Contents
Table of contents quique’s aircraft company 3 covering colors 4 going over the covering 5 hardware supplied 5 additional required tools and adhesives 6 servo selection 7 using the manual 7 warning 7 warranty information 7 section 1-preparing fuselage 8 section 2-horizontal stab installation 9 sectio...
Page 3: Quique’S Aircraft Company
Quique’s aircraft company 3410 saint paris pike springfield, oh 45504 phone: (937) 629-0339 fax: (937) 629-0335 email: qqaircraft@gmail.Com website: www.Somenzini.Com www.Qqaircraft.Com online-support: http://www.Rcuniverse.Com/forum/forumid_437/tt.Htm quique and i want to express our thanks to you ...
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Covering colors ultra-cote covering used on this 73” yak-54 s can be purchased from horizon hobbies website. The codes are as follows: sky blue hanu875 smoke purple hanu868 white hanu870 bright yellow hanu872 going over the covering before beginning the assembly of your yak-54 s, remove each p...
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Hardware supplied pull/pull rudder-4 hinges aileron-12 hinges elevator-6 hinges engine mount wheels wing anti-rotation pins engine cowl & landing gear tail wheel elevator & wing connecting rods fuel tank engine box cowl mount blocks 5.
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Additional required tools and adhesives • covering/trim iron • xacto knife, #11 blade • pacer hinge glue (pt-55) • 5, 15 and 30-minute epoxy • petroleum jelly/lithium grease • acetone/alcohol swabs • felt-tip marker • pencil and marker • ruler • drill • drill bit #1, #3, #28, #51 and #52 • wire cutt...
Page 7
Servo selection the servos used for the control surfaces of this yak-54 s must have a minimum of 130 ounce-inch of servo torque. In the prototype yak-54 s, we used jr8411sa on all control surfaces and on throttle we used one standard jr servo. Best results can be obtained by using digital servos. Pl...
Page 8
Section 1-preparing fuselage required tools and adhesive • xacto knife, #11 blade • trim iron • white glue • 1/16” balsa strips step 1 use a xacto knife with a # 11 blade and cut away the film covering on both sides of the fuselage for the wing openings, figure 1. Some modelers may want to overlap t...
Page 9
Section 2-horizontal stab installation required tools and adhesive • ultra fine point sharpie • acetone • xacto knife, #11 blade • felt tip marker • thin and thick c/a step 1 center the h. Stab so that the left tip and right tip are equal distance from the fuselage sides. See figure 3. Figure 3 step...
Page 10
Step 5 use a new # 11 blade and gently cut through the ultra cote. See figure 5. There are two layers, cut through the top layer first and remove it. You have probably cut through the second layer. If not you may cut through the second layer. Be very careful not to cut into the balsa sheeting as thi...
Page 11
Section 3-vertical fin installation figure 7 step 9 place the fuse so the h. Stab is vertical so the thin c/a glue will flow into the fuse sides. Apply the thin c/a glue along the h. Stab on both sides that do not have the tooth pick wedges. Let the thin c/a set up and then apply some more thin c/a ...
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Step 3 remove the film covering as shown. As with the horizontal stab there is more than one layer of film. By removing the film covering you will have a stronger bond between the vertical fin and the fuse as shown. See figure 9. Figure 9 step 4 be careful to make a very shallow cut through the film...
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Section 4-preparation and installation of hinges required tools and adhesive • xacto knife, #11 blade • lithium grease/petroleum jelly • toothpicks • pacer hinge glue (pt-55) or 30-minute epoxy the hinge slots are already installed in the balsa hinge locations on both the fixed surfaces and the move...
Page 14
Step 4 check the gap on each control surface. The gap should be somewhere between 2 and 3 mm. This procedure will take some time to do all of the hinges but take your time and do a nice job. As you do each hinge and check out the proper depth and shape of the v-slot necessary for each hinge, the tim...
Page 15
Section 5-elevator, rudder and aileron control horn installation required tools and adhesive • course sandpaper • xacto knife, #11 blade • 30-minute epoxy • alcohol swab/alcohol and paper towel elevator horn installation step 1 cut the slots in the bottom of the two elevators to accept the two pc bo...
Page 16
Step 2 again rough up the surface on the p/c board control horn that will be glued into the rudder. Clean with alcohol or acetone and epoxy. Be sure that the rudder horn is square to the rudder. You should be able to eyeball this. See figure 16. Figure 16 aileron horn installation step 1 find the lo...
Page 17
Section 6-rudder & tail wheel installation required tools and adhesive • xacto knife, #11 blade • 30-minute epoxy • alcohol swab/alcohol and paper towel • wire cutter you should have already prepared all flat hinge slots for all control surfaces. For flat hinge attachment method, please refer again ...
Page 18
Figure 21shows the tail wheel assembly ready for placement into the rudder. Figure 21 step 6 use the four screws provided and attach the tail wheel bracket assembly to the fuselage. See figure 22. Figure 22 step 7 after you have checked to make sure all hinge slots are deep enough and also that the ...
Page 19
Section 7-elevator servo installation required tools and adhesive • 24” servo extension • sullivan inner nyrod • pin vise • 2 full threaded servo mounting screws step 1 attach 24-inch servo extension wires to the elevator servos. You may want to wrap the servo plug connections with a small piece of ...
Page 20
Step 6 to attach the elevator servo control arms to the elevator control horns, use the titanium elevator connecting rods, provided. The longer titanium control rod is for the right side of the fuse. Note that the ball links provided should be mounted as shown in figure 25. Figure 25 the ball links ...
Page 21
Section 8-rudder servo and pull/pull installation required tools and adhesive • pliers • masking tape • 2 full threaded servo mounting screws step 1 install rudder servo as shown in figure 26.Notice the servo wire is threaded through the oval holes in the bottom of the fuse formers and threaded forw...
Page 22
Of the crimped brass tube pieces and the cable. Step 5 screw the threaded brass connectors half way into the plastic ball link connection on the extended rudder servo arm as shown as shown in figure 29. Figure 29 step 6 install both pull/pull cables on the extended rudder servo control arm as shown ...
Page 23
Step 12 bend the cable over and slip the loose end into the brass sleeve. Important: do not use the spacer when assembling the ball link to the rudder control horn. See figure 31. This spacer is not needed in this application and think of all of the weight you will save. Figure 31 23.
Page 24
Section 9-engine mounting and throttle control installation required tools and adhesive • drill • #3 (0.213”) drill bit • #1 (0.228) drill bit step 1 mount your engine on the two engine mounts provided. Note that the prop hub of the engine must be exactly 5.5 inches in front of the back of the two e...
Page 25
Step 4 determine the location of the holes on the firewall for installing the engine mount, mark them and drill the holes through the firewall using a #3 drill bit .213 of an inch in diameter to accept the blind nuts provided. A good tool for the centering of the holes for mounting the engine is ava...
Page 26
Section 10-landing gear installation required tools and adhesive • drill and #3 (0.213”) drill bit step 1 drill two holes in the landing gear to attach the gear to the fuselage. See figure 38. Figure 38 step 2 drill the holes in the landing gear legs for the axle and the wheel pant attachment screw....
Page 27
Step 6 attach the wheel and wheel pant to the gear. Do not drill the hole in the wheel pant to accept the wheel pant screw just yet. Assemble as shown. Use 4mm x 50mm axle screw. Use 3 washers and two lock nuts that are provided as shown for each wheel. Step 7 put a washer on the gear axle and place...
Page 28
Section 11-fuel tank installation and engine box completion required tools and adhesive • medium c/a • 15-30 minute epoxy • velcro • ¼”x3”x3-1/4” balsa wood • masking tape • sandpaper • double sided tape step 1 assemble the fuel tank hardware as shown. See figure45. Be sure the vent tube with the sh...
Page 29
Mind of its own. Ten g’s would not be uncommon in some violent 3-d maneuvers, which this yak-54 is capable of doing certainly with the control surface throws that you have available. Step 4 install the fuel lines per the manufacturer’s instructions for the engine of your choice shown in figure 48 ar...
Page 30
Figure 50 if you inadvertently get any epoxy in that slot area, make sure you clean it out. If any excess epoxy gets in that slot and hardens it won’t be much fun to clean out and the canopy hatch will not slip into position. Step 7 install the muffler and get ready for next section to cut the cowl....
Page 31
Step 3 draw a line that matches up with the middle of the hardwood blocks and back onto the masking tape pieces you just placed on the fuse. Step 4 measure back one half inch from the front of the fuse former and make a vertical line. That is the distance of the overhang of the engine cowling over t...
Page 32
Step 8 mark a vertical line one inch in front of the back of the engine cowling. These are the locations for the four holes to fasten the cowling to the fuselage. See figure 55. Figure 55 step 9 drill the four holes with a # 51 drill bit through the cowling and on into the wood blocks. Go ahead and ...
Page 33
Notice the hole cut out in the front of the engine cowling in the area that is painted black. This of course is for the incoming air that will pass through and around the cylinder to cool the engine. When you are ready to attach the engine cowling, we have found that it is very helpful to use a smal...
Page 34
Section 13-canopy installation required tools and adhesive • xacto knife, #11 blade • drill and drill bit #28 • thin/medium c/a • rat-tail file there are two holes in the fuse, one on each side, to accept the screws to hold the canopy in place. Step 1 find the locations for the two screw holes. They...
Page 35
Step 6 at this point you should drop a little thin c/a glue around this hole in the fuselage side to make the lite-ply fuse side harder. The c/a will soak in and make the light ply more like regular aircraft plywood. Step 7 tighten the canopy screw down firmly it won’t crush the harden lite- plywood...
Page 36
Section 14-wing preparation and aileron servo installation required tools and adhesive • xacto knife, #11 blade • fine sandpaper • thin c/a • 5-15 minute epoxy • alcohol swab/acetone • 9” servo extensions (2) • small sheet metal screws • ruler step 1 cut out the film covering over the access holes f...
Page 37
Step 4 after you have checked all of these four holes for proper depth, use thin c/a glue and apply around the pins to affix them to the root rib of each wing. Step 5 use some epoxy and make a fillet of epoxy inside the wing around the anti-rotation pin and the second wing rib. See figure 63. Figure...
Page 38
Step 11 attach a nine-inch servo extension cable to the servo. You do this by using the same system you used to install the elevator servo extension cables. To insert the aileron servo extension wires, use a music wire with a loop end and pull the extension through the servo lead hole in the wing ro...
Page 39
Section 15-battery tray installation required tools and adhesive • pencil/marker • drill & drill bit #52 • 30-minute epoxy • double-sided tape • electrical tape • velcro • sandpaper (fine) align the battery tray to the engine mount. Take a pencil and mark. Then sand the area where the tray will be g...
Page 40
Section 16-radio equipment you are now in the final stages in completing the assembly of your yak-54. Quique’s method of mounting the radio receivers in his proto-type airplanes: starting with the plywood mounting plate for the receiver, motor control servo and the radio switch: 1. Apply some beads ...
Page 41
Custom muffler central hobbies has a custom muffler available for this somenzini yak-54 for the ys-140 sport engine that quique’s uses in this airplane. You may contact them at their website, www.Centralhobbies.Com . See figure 72 & 73 for quique’s custom muffler installation. Between the muffler ca...
Page 42
Balancing the model perhaps one of the most important things that you need to check before you fly your plane is your model c.G. Correctly balancing an aerobatic model is critical to its performance and flight characteristics. An unbalanced model can be very hard to control. Please make sure that yo...
Page 43
Control throws aileron (as shown in figure 76 & 77) low rate high rate 39 mm up 59 mm up 39 mm down 59 mm down figure 76 figure 77 elevator (as shown in figure 78 & 79) low rate high rate 8 mm up 61 mm up 8 mm down 61 mm down figure 78 figure 79 43.
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Rudder (as shown in figure 80 & 81) low rate high rate 34 mm right 70 mm right 34 mm left 70 mm left figure 80 figure 81 44.
Page 45
Preflight at the field range test your radio make sure you range check your radio before you attempt to fly your plane. Turn on your transmitter with antenna fully collapsed and walk away 100 ft. Move all your control surfaces and make sure everything is fine. If you are running a gas engine not onl...