Red Star RC Yak-3 Manual de usuario
Yak-3
Instruction Manual
Wingspan: 55 in. (1397mm.)
Wing Area: 680 sq. in. (43.87dm2)
Weight: 5 – 5 1/2 lbs (2268g – 2495g)
Length: 50 in. (1270mm.)
Wing Loading: 17-18.6 oz per sq ft
(51.7-56.9g per dm2) 308 Belltown Road, Owings Mills, MD 21117-3239
www.redstarrc.com
red_star_rc@yahoo.com
© 2004 Red Star RC
2
Thank you for purchasing Red Star RC YAK-3 sport scale model Kit. This kit has been designed using
3D computer engineering and interlocking construction design help you to build straight lightweight
model. Low wing loading and built in washout make this model a good flying plane. Please keep in mind
that this kit is intended for intermediate builder and intermediate pilot. If you do not meet these criteria, it
is recommended to seek help from a more experienced builder / pilot.
Good luck!
George & Mike
Red Star RC, BALTIMORE, MARYLAND, USA
redstarrc@yahoo.com
WARRANTY…..Red Star RC guarantees this kit to be free from defects in both material and
workmanship at the date of purchase. This warranty does not cover any component parts damaged by use
or modification. In no case shall Red Star RC’s liability exceed the original cost of the purchased kit.
Further, Red Star RC reserves the right to change or modify this warranty without notice.
In that Red Star RC has no control over the final assembly or material used for final assembly, no liability
shall be assumed nor accepted for any damage resulting from the use by the user of the final user-
assembled product. By the act of using the user–assembled product, the user accepts all resulting liability.
If the buyer is not prepared to accept the liability associated with the use of this product, the buyer is
advised to return this kit immediately in new and unused condition to the place of purchase.
NOTES BEFORE BEGINNING CONSTRUCTION
•Read the instructions and the plan sheet prior to start any work.
•Do not remove the parts from sheets until required.
•Prior to gluing, test fit and match parts over the plan.
Kit Contents:
•Computer Drawn Plan Sheet 1
•Illustrated Instruction Manual 1
•Laser Cut Balsa and Plywood Parts Sheet
•Clear Canopy 1
•1/16x4x24 Balsa Sheet 16
•3/32x4x24 Balsa Sheet 2
•3/4x3x36 Balsa Block 1
•1 1/2x2x12 Balsa Strip 1
•1/8x1/4x24 Balsa Strip 2
•1/4x1/4x24 Balsa Strip 3
•1/2x1/2x12 Balsa Strip 1
•1/16x1/4x36 Balsa Strip 3
•1/16x1/2x36 Balsa Strip 2
•1/2x1x36 Balsa Block 2
•1x1x9 3/4 Balsa Block 1
•1/8x1/4x24 Bass strip 10
•1/2x1/2x24 Bass block 1
© 2004 Red Star RC
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Additional Hardware (Required for completing kit):
6-32 Bolt-nut Set (4 bolts, 4 Flat Washers, 4 Lock Washers, 4 Blind Nuts) 1
Control horns (Du-Bro #107) 3
Push rod (Du-Bro #230) Ailerons 1
E/Z Links (Du-Bro #855) Ailerons 1
E/Z Connectors (Du-Bro #121) 1
Push Rods Sullivan Gold-n-Rod 1
Retracts Hobbico 1
Dubro Nylon Large Straps 5/32"(4) Landing Gear Covers 1
Wheel Axels (Du-Bro #615) 1
Wheel Collars (Du-Bro #140) 1
Wheels (Du-Bro super light #300sl) 1
Tailwheel (Ohio OHI100) 1
Fuel Tank Sullivan 8 oz (s427) 1
Spinner (Du-Bro 2.75" #293) 1
Engine OS-.40FX (OS-.46FX) 1
Muffler Jtec JT-601 1
Prop Master Airscrew 11x6 1
Recommended Finishing Items:
Monokote (Sky Blue 20206) 1
Monokote (Gray/Green 20211/20214) 1
LustreKote Spray Paint 1
LustreKote Spray Flat Clear 1
CA Hinges
Radio Gear:
5-channels receiver (7-channels recommended) 1
6” Servo Extension 2
6” Y-servo Extensions 1
Futaba Standard Servo 5
Items You May Need:
Thin and Medium CA
30-min Epoxy
Wax Paper or Plastic Wrap
Razor Blades
Different Grid Sand Paper
Balsa Wood Filler
Windex
Isopropyl Alcohol
© 2004 Red Star RC
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Laser Cut Patterns
© 2004 Red Star RC
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© 2004 Red Star RC
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Build the Stab & Elevator
1. Locate and carefully remove Horizontal Stab and
Elevator parts from balsa sheets. Test fit and sand
them if necessary. Assemble using this figure as a
reference. Fill the gaps with thick CA if needed.
2. Bent 4.5” long piece of 2-56 pushrod according
to picture. Drill holes and join two elevator halves.
Build the Fin & Rudder
Unroll the plan sheets. Put them on your building
board and cover with wax paper so glue will not
adhere.
1. Locate and carefully remove Fin and Rudder
parts from balsa sheets. Test fit and sand if
necessary. Assemble using this figure as a
reference. Fill the gaps with thick CA if needed
Sand LE of Horizontal Stab and Fin round. Sand LE
of Elevator and Rudder triangle and TE round.
Hinge them according to the hinge locations.
1
”
2.5
”
© 2004 Red Star RC
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Build the fuselage
1. Locate one 1/8”x 6”x 24” ply sheet and two
1/8x4x24 balsa sheets with fuse formers. Carefully
remove needed parts from the sheets.
2. Cover your working area with wax paper. Locate
and glue two rear halves of main fuse horizontal
former F-B and F-D together.
3. Glue two front halves F-A and F-C together.
4. Glue front and rear horizontal fuse former parts
together.
5. Glue bottom formers according to the plan. Using
building square make sure they are 90° to horizontal
former.
6. Splice two pieces 1/8” x 1/4” x 24” bass stringers
together with an overlap as shown. Make two of
them.
© 2004 Red Star RC
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7. Glue side bass stringers extending forward as
shown. They will be attached to the firewall later.
8. Cut into shape at the rear and glue together.
9. Locate two wing bolt support WB-A and WB-B
and glue them together.
10. Locate two fuse side formers S1. Insert WB
block into one side of the former, and then put
another former in place and glue.
11. Install bottom 1/4”x 1/4” balsa stringer.
12. Locate TB-A and TB-B fuselage tail block
halves. Glue them together and install in place.
© 2004 Red Star RC
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13. Sand tail block into shape.
14. Locate tail wheel support plate TW. Test fit it
and glue in place.
15. Using 30-min epoxy, glue together firewall
FW-A and FW-B formers, motor mount ML-A and
ML-B, MR-A and MR-B.
16. Test fit and glue firewall into side formers using
30-min epoxy. Glue bass stringers to firewall and side
formers. Cut flush with firewall. Test fit motor mounts.
Pay special attention to their position. You should get
3° right and 3° down thrust! Then test fit your motor!
Make sure motor sits tight in the motor mount. When
satisfied with the result glue them permanently using
30-min epoxy. Also pay attention that fuselage stays
true and straight after this step!
17. Glue top formers according to the plan. Using
building square make sure they are 90° to horizontal
former.
18. Glue cockpit doublers f2 and f3 to the formers
F2 and F3. Glue 1/8”x 1/4” top fuse spar.
© 2004 Red Star RC
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19. Install two sheeting support doublers using
1/8x1/4 leftover balsa strip.
20. Install wing pin doubler in place.
21. Align 1/16”x 4”x 24” balsa sheeting using
T-pins alongside center of the fuselage side stringer.
Connect two sheets on sheeting support doubler.
22. Glue it to formers and stringers, and then trim
alongside the bottom stringer and wing saddle.
23. Sheet the other side of the fuselage same way.
Do not sheet the bottom of the fuse yet. You need
free access to it when you mount pushrods.
24. Cut two 15” long 1/16” balsa sheet. Glue to the
top stringer. Spray with Windex to make it more
flexible. Bend it over formers and fix in bent
position using masking tape. Let it dry. Trim and
glue it on fuselage.
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