SIG Primary Force Control-Line Stunter Manual Download Page 8

26) Bolt the main landing gear legs to the fuselage as follows:

a) Flow a couple drops of Thin CA into the two holes in the 

fuselage for the main landing gear attachment bolts. This 
seals the wood from fuel and oil. Let dry.

b) Insert two M3 x 25mm phillips-head bolts through the 

mounting holes of one of the main landing gear legs. Run 
these bolts through the mounting holes in the fuselage, 
holding the landing gear leg tight against the fuselage.

c) Place the other landing gear leg over the protruding bolts on 

the other side of the fuselage, and then screw on the M3 
lock nuts. Tighten securely.

COMPLETING THE  LEADOUTS

27) Use a 2.5mm hex wrench or ball driver to adjust the leadout

guide at the wing tip. The leadout guide adjustment bolt should be
located 2-3/8” aft of the wing leading edge (or 6-11/16” forward of
the trailing edge) for the first test flight.

28) Lock the elevators in neutral position as you did in Step 23e,

using two pieces of scrap balsa stick and a couple rubber bands.
Then pull both leadout wires tight at the wing tip with one hand,
while you measure out 2-1/2" from the wing tip and mark both
leadouts together at this point.

h) Once you have the pushrod locked in the connector, hold 

the bellcrank in neutral position while you check the position 
of the elevators. If necessary, adjust the overall length of the 
pushrod by screwing the clevis in or out until the elevators 
are in perfect neutral when the bellcrank is in neutral. When 
you’ve finished the adjustment, slide the clevis retainer 
spring over the clevis, and then tighten the clevis lock nut up 
against the back of the clevis.

LANDING GEAR

24) Install the tailwheel assembly on the bottom of the fuselage,

as follows:

a) Trial fit the tailwheel wire into the pre-cut slot in the bottom 

of the fuselage. The wire should fit completely in the slot, 
flush with the surface of the fuselage.

b) Hold the two metal straps in position over the tailwheel wire 

and mark the locations for the four mounting screws. Drill 
four pilot holes with a 3/64" dia. bit.

c) Place a small drop of Thin CA in each drilled hole for fuel 

proofing.

d) Remove the tailwheel wire and coat the inside of the slot 

with Thin CA for fuel proofing. Let dry.

e) Re-insert the tailwheel wire into the slot and secure in place 

with the metal straps and four M2 x 8mm screws.

25) Assemble the main landing gear legs in this order.

a) Slide one of the flat metal washers onto the M3 x 25mm 

phillips-head axle bolt, all the way up to the head of the bolt.

b) Next slide the wheel bushing onto the axle, and then the 

main wheel over the bushing.

c) Add two more flat metal washer, which serve as spacers 

between the wheel and the wheel pant.

d) Insert the axle assembly through the axle hole in the wheel 

pant and then through the bottom hole of the landing gear leg.

e) Complete the assembly with another flat metal washer and 

a lock nut against the gear leg. Tighten securely. Make sure 
the wheel turns freely.

f) Repeat this sequence to assemble the other main landing 

gear leg, wheel, and wheel pant.

8

Summary of Contents for Primary Force Control-Line Stunter

Page 1: ...he covering Over heating a seam can cause the covering to creep exposing the wood underneath For reshrinking AEROKOTE set your iron temperature to approximately 220O 250O F 104O 121O C 1 INTRODUCTION Congratulations on your purchase of the SIG Primary Force ARF The reason for the name Primary is that this contest winning stunt ship is really easy to build trim and fly It makes an excellent model f...

Page 2: ... 1 Stabilizer 2 Elevators 1 Joiner Wire installed but not glued 4 CA Hinges installed but not glued 1 Pushrod Wire 1 Metal Clevis 1 Clevis Retainer Spring 1 Clevis Lock Nut 1 Nylon Control Horn Retainer Plate 3 M2 x 15mm Phillips Head Bolts 1 Right Main Landing Gear 1 Left Main Landing Gear 2 M3 x 25mm Phillips Head Bolts 2 M3 Lock Nuts 2 Main Wheels 2 M3 x 25mm Phillips Head Axle Bolts 2 Wheel Bu...

Page 3: ...moved during trimming process FUEL TANK ASSEMBLY The fuel tank provided in this kit is a 4 oz clunk style plastic tank We have used this tank successfully on the Primary Force with either standard up down 2 vent plumbing and with uniflow plumbing The choice for your airplane is up to you based on your personal experience and preference For simplicity the following instructions will only show the i...

Page 4: ...J Bolts back in Use a rag soaked with rubbing alcohol to remove the ink lines and clean up any excess epoxy h Use six to eight 32 or 30 Rubber Bands not supplied to mount the fuel tank in place between the J Bolts as shown i Connect the tank s fuel feed line to the engine with a piece of heat proof silocone fuel line tubing not supplied j Optional Place a piece of foam rubber not supplied between ...

Page 5: ... to get the fuselage and the wing perpendicular to each other Since the wing of the Primary Force has a triple taper and is offset from center verifying the alignment by measuring is not a simple matter We will need to create a dependable way to verify the alignment accurately Fortunately if you look very closely at the surface of the Primary Force wing you will see that the front edge of the trai...

Page 6: ...o the next step 14 Remove the covering material from the wing between the marked lines to allow for maximum gluing area Use a sharp 11 hobby knife or single edge razor blade to cut through the covering material just inside the marked lines Be very careful to cut the covering material only not the balsa wood structure underneath After you ve cut through the covering material peel the unwanted cover...

Page 7: ...use a fine applicator tip on your glue bottle You will notice that the glue quickly wicks into the wood and the hinge Quickly turn the model over and apply 2 drops of glue to the other side of the hinge Continue this process until you have glued both sides of all the hinges Keep a rag handy to wipe off any excess CA glue Note If you get some glue smears on the plastic covering don t worry about th...

Page 8: ...neutral when the bellcrank is in neutral When you ve finished the adjustment slide the clevis retainer spring over the clevis and then tighten the clevis lock nut up against the back of the clevis LANDING GEAR 24 Install the tailwheel assembly on the bottom of the fuselage as follows a Trial fit the tailwheel wire into the pre cut slot in the bottom of the fuselage The wire should fit completely i...

Page 9: ...y removing the paper backing sheet and then laying the decal in position and pressing it in place with your finger For the larger decals we suggest the following method of application a Carefully cut out the decal with a hobby knife b Peel the paper backing sheet completely off the decal being careful not to let the sticky side double over and adhere to itself c Use a product like SIG Pure Magic M...

Page 10: ...ard wing should drop in a hard corner Make small adjustments one at a time Remove one of the weights from the box and cut off the corners of the weight Fly the model and see if the wing drops again in a hard corner If it does cut off the corners of another weight and fly again The Primary Force should pop a turn without any sign of wobble or hop while exiting a square turn If the model feels soft ...

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