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       Lanier R/C

Sukhoi SU 31M 

Instructions

WARNING!  THIS IS NOT A TOY! 

THIS IS NOT A BEGINNERS 

AIRPLANE

This R/C kit and the model you will build 
from it is not a toy!  It is capable of 
serious bodily harm and property damage. 
It is your responsibility, and yours alone - 

to build this kit correctly, properly install all 
R/C. components and flying gear (engine, 
tank, radio, pushrods, etc. and to test the 
model and fly it only with experienced, 
competent help, using common sense and in 
accordance with all safety standards as set 
forth in the Academy of Model Aeronautics 
Safety Code.  It is suggested that you join the 
AMA and become properly insured before 
attempting to fly this model.  If you are just 
starting R/C modeling, consult your local 
hobby dealer or write to the Academy of 
Model Aeronautics to find an experienced 
instructor in your area.

Any action brought forth against the company,
based on the breach of the contract of sale to the 
buyer, or on any alleged warranty thereunder,
must be brought within one year of the date of 
such sale, or there after be barred.  This one year 
limitation is imposed by agreement of the parties 
as permitted by the laws of the state of Georgia. 

Write to : Academy of Model Aeronautics, 

5151 Memorial Dr, Muncie, IN 47302 

LIMITED WARRANTY 

Lanier R/C is proud of the care and attention that 
goes into the manufacture of parts for its model 
kits.  The company warrants that for a period of 

3

0 days, it will replace, at the buyers request, any

parts or material shown to the company's
satisfaction

to have been defective in 

workmanship or material at the time of purchase. 

No other warranty of any kind, expressed or
implied, is made with respect to the merchandise 
sold by the company.  The buyer acknowledges 
and understands that he is purchasing only a
component kit from which the buyer will himself 
construct a finished flying model airplane.  The 
company is neither the manufacturer of such a
flying model airplane, nor a seller of it.  The buyer 
hereby assumes the risk and all liability for 
personal or property damage or injury arising out
of the buyers use of the components or the 
finished flying model airplane, whenever any such
damage or injury shall occur. 

   37% Sukhoi SU 31M 

1

Summary of Contents for Sukhoi SU 31M

Page 1: ... one year of the date of such sale or there after be barred This one year limitation is imposed by agreement of the parties as permitted by the laws of the state of Georgia Write to Academy of Model Aeronautics 5151 Memorial Dr Muncie IN 47302 LIMITED WARRANTY Lanier R C is proud of the care and attention that goes into the manufacture of parts for its model kits The company warrants that for a pe...

Page 2: ...u join with a finger joint Lay the front and rear pieces on wax paper and fit the joints together Glue with CA After it has cured you will make a left and right side by gluing the servo mount doublers on the inside at the rear servo holes Glue a scrape piece of 1 8 ply over the finger joint at the top and bottom on the inside of each fuselage side being sure to leave room at the top for the 1 8 to...

Page 3: ...ear side at the top Don t remove too much you want the M1 s to be tight in the slots Assemble the F1 former the two M1 motor box sides and the F2 former Do not glue Use masking tape to hold together Lay the fuselage top on a flat surface and install all bulkheads F1 thru F6 Tack glue in place flush with the topsides Take the left and right side and fit the tabs on the bulkheads into the notches on...

Page 4: ...iled the notches you may have to adjust the M1s up or down a little You can now glue the whole assembly together You can use carpenters glue and wipe both sides of every joint Use tri stock on the backside of F1 where the sides meet and where the M1s pass through After the glue has dried epoxy the Lg 1 4 laser cut ply landing gear plate in place At the rear of the fuselage glue the F6A former in p...

Page 5: ...o the front edge of the landing gear plate and the F2C to the rear edge Take four pieces of 1 4 x1 4 x36 spruce and make the outside stringer on both sides of the fuse Start at F2c and run to the middle of F4 then run a piece from the middle of F4 to the rear of the fuse at F6A The five center stringers are balsa At the front they run from F2C to F4 From F4 to the rear there is only one stringer T...

Page 6: ...phenolic tube flush with the fuselage sides Locate the turtle deck formers and tack glue them in place Glue a square balsa stringer down each side of the fuselage inset 3 32 from the side Install the rest of the stringers between TD1 and TD5 Prepare the turtle deck sheeting by cutting four pieces of 3 32 x4 balsa to 29 1 4 Edge glue two sheets together Cut a 1 8 step in the rear to match the fusel...

Page 7: ...ing into place and hold with tape until the CA has set up Repeat for the other side Sand the sheeting flush with the front and rear formers Locate the F1A former and glue to front of fuselage flush with front Make sure that it is perpendicular to the top of the fuselage and centered up from side to side This is what the top half of the cowl mounts to so it must be securely glued on Take a piece of...

Page 8: ... hatch floor Glue the dowels in H1 Be careful not to glue the hatch floor to the fuselage or to the F1A Now glue H2 and H3 to the hatch floor in their slots Make sure they are centered on the floor Glue the CR former at the rear of the hatch floor It should be 040 smaller around the edges than the turtle deck Sand to fit Now glue the balsa stringers in place The two outside stringers run from H1 t...

Page 9: ...atch floor Put wax paper under the hatch floor and at the front and rear of the hatch Apply white glue to all the stringers and bulkheads except the middle one Run a bead of thick CA along the edge of the hatch floor at the top of the fuselage and tape the sheet in place Apply a bead of thick CA along the outside edge of the center stringer and wrap the sheeting into place Hold with masking tape t...

Page 10: ... will be glued in after covering The cockpit floor can be sheeted wood not supplied or left open where the pilot can be mounted in the fuselage your choice Trim the clear canopy to the scribe line and fit to cockpit It will not be glued in place till after the plane is covered Be sure the cockpit is screwed in place when gluing the canopy to avoid warping the cockpit so it does not fit Landing Gea...

Page 11: ...o mount the gear With the bolts temperately installed fit a piece of tri stock on each side of the gear where it will fill the area between the bulkheads Do not glue at this time Sand to match the contour of the bulkheads To save weight there is no filler block over the gear After the plane is covered mount the gear glue in the filler piece on each side and cover over the opening Cowling Take the ...

Page 12: ...and nuts Do not remove the fiberglass in the front unless you plan to use a dummy engine it will be used to baffle the engine Fit the cowl over the front of the fuselage It will extend over the F1A and be flush with the hatch on top It will overlap the sides by about 3 8 to 1 2 It will extend back over the F1B on the bottom Using a long straight edge make sure the cowl is parallel to the front hat...

Page 13: ...motor box sides to the front of the cowl and adjust for your engine length The DA150 is shown with a 1 spacer not included so the mufflers will clear the firewall You need 3 degrees of right thrust Cut 3 8 off the right motor box side to achieve this Epoxy the firewall in place between the motor box sides After the glue has dried epoxy the motor box bottom in place Using1 2 tri stock do all the co...

Page 14: ...onstruction Note when working on a wing panel always make sure it is resting in a packing to prevent warping 4 Locate the 8 sq hardwood spars and glue them in the spar slots with epoxy or white glue Make sure they are seated in the groove and flush with the top surface Put wax paper down on the packing and lay the wings back in Place on a flat surface and add weights and allow to dry If groove is ...

Page 15: ... wing core down the moisture helps the urethane set up Place the skin in the padding align the wing core place the top skin in place add the top packing shell and then apply weight The wing must be on a flat sturdy surface 8 Check the packing and core for alignment and place a heavy board on it to distribute the weight Concrete blocks or bricks work well You will need about 200 lbs to firmly weigh...

Page 16: ...d Using a drill press drill a 3 16 hole at the nine locations Using a band saw cut the bevel on both piece leaving 1 16 on the sides and in the middle 12 Cap the aileron leading edge with the piece that was inset Make sure it is centered up on the aileron Use white glue and tape to hold it When cured trim and sand the ends flush with the foam Also plane and sand the top and bottom flush with the s...

Page 17: ...tersink the hole on the topside of the aileron to fit the screw head A 5 16 bit will work Now run an 8 32 tap down through the hole We recommend using Rocket City hardware It s strong and has never failed us The best way to make the hole for the servo lead is to buy a piece of copper pipe 60 long and using a propane torch heat the end Using the hole in the W1 rib align the tube and burn the hole i...

Page 18: ...wing mount bolt by measuring out 5 1 2 inches directly over the tube and drilling a 1 2 hole down to the top of the phenolic tube Do not drill through the phenolic Glue a piece of 1 2 dowel in flush with the surface of the wing Drill a 36 hole 106 in the center of the dowel all the way through the phenolic tube Run a 6 32 tap through the hole and counter sink the top for the screw head Center the ...

Page 19: ...nd rudder along the lines you drew Draw a line and cut off the trailing edge of the fin and off the leading edge of the rudder Cut 3 32 off the top of the fin and the bottom of the rudder inset Locate the x1 2 x24 fin leading edge and glue to leading edge of fin and top counter balance of rudder after trimming the sheeting flush Glue the 1 x1 1 2 x11 balsa block fin tip to top of fin and sand to s...

Page 20: ... and shape to match the radius on the back of the fuselage Sand entire assembly and set aside till ready to mount on fuselage It is easier to set the incidence on the stab before you glue the fin in place When ready to mount to fuselage the fin must have a notch cut in the back just in front of the trailing edge block It is wide and 15 16 high to clear the F7 former and let the fin set on the fuse...

Page 21: ... one side Make two tops and two bottoms Use the same procedure described in the wing section to sheet the stabs After the glue has dried trim the balsa flush with the foam Locate the SR laser cut lite ply root rib and slide it over the phenolic tube do not glue at this time Measure in 4 from the tip and draw a line parallel to the tip Using a square along the tip draw a line from the rear edge of ...

Page 22: ...o the insides edges of the elevators Locate the 3 32 laser cut balsa parts ST and glue to ends of stab and the inset of the elevator Glue the two 1 x1 1 2 x13 1 2 balsa blocks to the tips of the stabs and sand to shape shown on plans Measure in 3 from the root directly over the center of the phenolic tube and drill a 3 8 hole down to the tube do not drill through the phenolic Glue a 3 8 dowel into...

Page 23: ...o the hole Countersink the 3 8 dowel so the head of the screw will be flush with the surface of the stab Install the screw and then do the other side making sure to hold the stabs tightly against the sides of the fuselage Take the elevator halves and tape in place on their foam cores Measure out 3 7 8 from the center and mark the first hard point for the elevator horn Measure 7 1 4 out from that p...

Page 24: ...th of the rudder A more scale appearance can be achieved by removing this from the rudder and elevators The changes were made to improve 3D capability of the airplane A 1 8 laser cut ply tank mount is included This will sit on the wing tube between the M1 sides Glue a short piece of 1 2 tri stock on the M1 forward of the tube to glue the tank mount to This will allow you to mount the tank on the C...

Page 25: ...eel steering mount motor box top rails tri stock x 36 2 F1 and motor box reinforcement x7 58 x8 5 2 motor box top and bottom x1 4 x48 spruce 4 fuse side rails x1 4 x36 spruce 5 fuse bottom outside stringers x1 4 x36 balsa 24 turtledeck hatch and bottom stringers 3 32 x3 x36 10 balsa sheeting turtledeck and hatch 1 1 2 x18 phenolic tube spar carry through 1 8 x12 dowel Pins for firewall Clear instr...

Page 26: ... x18 spruce aileron servo mounts Rolled instructions Instruction booklet Additional Material needed 1 DA 150 engine with mufflers 2 32x10 Menz or 28x12 three blade Airhobbies prop 3 Tru Turn 6 inch spinner P 51 style 4 Sullivan wheels 5 inch 5 Dubro axels 3 16 6 Rocket City control horns 69D 7pkg required 7 Rocket city ball links 57 7pkg required 8 Dubro 4 40 threaded rods 6 12inch 9 Dubro 4 40 qu...

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