Estes Baby Bertha EST 1261 User manual

ESTES® INDUSTRIES
1295 H Street
Penrose, CO 81240
PRINTED IN CHINA
www.estesrockets.com
PARTS:
Locate the parts shown below and lay them out on the table in
front of you. DO NOT USETHIS DRAWINGTO ASSEMBLE
YOUR ROCKET.
ASSEMBLY TIP
Read all instructions before beginning work on your model.
Make sure you have all parts and supplies.
TEST-FIT ALL PARTSTOGETHER BEFORE APPLYING ANY
GLUE. If any parts don’t fit properly, sand as required for
precision assembly.
KEEP FOR FUTURE REFERENCE.
HELPFUL HINT: IF NOSE CONE/COUPLER FIT IS. . .
TOO
TIGHT
TOO
LOOSE
ADD
MASKING TAPE. SAND FOR FIT.
Blue Engine
Mount Tube (1)
(30326-1)
Launch Lug (1)
(38175)
Decal Sheet (1)
(37713) Assembled 12” (30 cm) Parachute
(35801)
Engine Hook (1)
(35021)
Shock Cord (1)
(38374)
SUPPLIES In addition to the parts included in the kit you will also need:
Body Tube BT-60 (1)
(30400)
Centering Ring Card
RA-2060 (1) (30128)
(01/02) P/N 37713
Die Cut Balsa Sheet (1)
(32393)
TUBE MARKING GUIDE AND SHOCK CORD MOUNT
LAUNCH LUG
FIN
FIN
FIN
FIN
MATCH
LINES
MATCH
LINES
Nose Cone (1)
(71020)
Green Engine
Block (1)
(30162-2)
Mylar Retainer
Ring (1)
(30168)
OR
SCISSORS PENCIL RULER FINE
SAND PAPER
(#400-600 GRIT)
CARPENTER’S
GLUE MODELING
KNIFE MASKING
TAPE PRIMER
(WHITE) SPRAY PAINT:
BLACK & WHITESPRAY CLEAR
COAT
(OPTIONAL)
1/32” (1 mm)
WHITE
PIN STRIPE TAPE
WHITE PAINT
PEN
TM
FLYING MODEL ROCKET KIT INSTRUCTIONS
EST 1261

1. ASSEMBLING ENGINE MOUNT
page 2
C.Stack Fins and sand edges.
A.Sand Die Cut Balsa Sheet
with fine sandpaper. B.Cut Fins free with hobby knife.
A. Measure and mark Engine Tube.
F.Apply glue around tube at 1/2” (13 mm) mark and
slide notched Ring into place.Let glue set. Apply
glue around end of tube and slide unnotched
Centering Ring in place flush with tube end.
B. Remove the guide and save for step 6. Connect
Fins and Launch Lug lines (arrows) using door
frame as shown.
C.Extend Launch Lug line 3 3/4”
(95 mm) from end of tube.
C.Apply glue around tube just ahead of
the 1 1/4” (32 mm) mark.Position Hook.
GLUE
1/8”
(3 mm)
B.Cut 1/8” (3 mm) slit at
2 1/2” (64 mm) mark.
1 1/4”
(32 mm)
1/2”
(13 mm)
2 1/2”
(64 mm)
D.Slide Mylar Retainer Ring onto Engine
Mount Tube up to 1 1/4” (32 mm) mark.
A. Use finger to smear glue 2” (51 mm) inside rear
of Body Tube. B.Align Engine Hook with Launch Lug line and insert
Engine Mount until Engine Tube is even with Body
Tube end.
C.Use a scrap piece of balsa to apply a glue
fillet to Centering Ring/Body Tube joint.
E. Apply glue inside front of Engine Mount
Tube. Insert Green Engine Block.
FRONT
MYLAR
RING
G.Apply glue fillets to both sides of Centering
Rings.Let glue dry completely.
GLUE
GREEN
ENGINE
BLOCK
1/2”
(13 mm)
FLUSH
WITH
END OF
TUBE
DOOR
FRAME
TOPVIEW
3. MARKING FIN AND LAUNCH LUG LINES
4. INSERTING ENGINE MOUNT
SCRAP
BALSA
2. PREPARING FINS
nbelowandlaythemoutonthetable in
SETHISDRAWINGTOASSEMBLE
BLYTIP
structionsbeforebeginningworkonyourmodel.
ouhaveall partsandsupplies.
LPARTSTOGETHERBEFOREAPPLYINGANY
arts don’t fit properly,sandasrequiredfor
bly.
BABY
BERTHA
™
UNNOTCHED
CENTERING
RING
BLUE
ENGINE
MOUNT
TUBE
LL
LL
ENDS EVEN
NOTCHED
CENTERING
RING
GLUE (FILLET) BOTH
SIDES OF EACH RING.
TAPE
LL
A.Cut out Tube Marking Guide from front page.Tape Tube Marking
Guide around Body Tube.Mark Body Tube at arrows and
Launch Lug line “LL”.
3 3/4”(95 mm)
LL
2”
(51 mm)
GLUE BODY
TUBE
LL

5. ATTACHING FINS
FINS SHOULD
PROJECT STRAIGHT
FROMTHE BODY.
NOTE: FINS MUST BE ATTACHED CORRECTLY FOR A STABLE FLIGHT.
90˚
90˚
90˚
90˚
FIN
FIN FIN LINE
FIN LINE
FIN FIN
A.Apply thin layer of glue to edge of Fin, wait one minute.Apply second
layer and attach Fin to Body Tube along one of the Fin lines. Repeat
for remaining Fins.
B.Check alignment of Fins
as shown.Allow glue to
set.
C.Stand rocket on flat table until
glue dries completely.
A.Scrape excess flash from
Nose Cone and clean the
eyelet of the Nose Cone.
B.
7.ATTACHING PARACHUTE & SHOCK CORD
DOUBLE
KNOT
SHOCK
CORD
C. D. E.
8.ATTACHING LAUNCH LUG
A.Glue Launch Lug centered
onto “LL” line where shown. B.Apply glue fillets along
Launch Lug and Fin/Body
Tube joints, smoothing each
fillet with your finger. Let
glue dry completely.
6.ATTACHING SHOCK CORD
A.Cut out Shock Cord
Mount from Tube
Marking Guide.
B. Apply glue. Fold
forward. D. Squeeze tightly
and hold for one
minute.
E. Glue mount 1” (25 mm) inside Body Tube.
Hold until glue sets.Let glue dry completely.
LAUNCHLUG
FIN #2
FIN #1
FIN #4
ENGINEHOOK
FIN #3
SHOCK CORD
PAINT SCHEME
First spray rocket with white primer, let dry and sand. Repeat until rocket is smooth. Follow the paint scheme on the front
panel or design your own.
Peel decals from backing sheet and apply where
shown.Rub down to remove bubbles.
* OPTIONAL - Clear Coat entire rocket when complete.
page 3
C. Apply glue. Fold
forward.
GLUE
EYELET
CAUTION: Do not cut off
eyelet of Nose Cone.
WHITE 1/32” (1 mm) PIN
STRIPE OR PAINT PEN
DECAL
BLACK
WHITE BLACK
WHITE
BLACK
1”
(25 mm)
3
GLUE
32
1
GLUE
BLACK
LL
2 1/2”
(64 mm)

COUNTDOWN AND LAUNCH
B. TIP MUST TOUCH
PROPELLANT.
ROCKET PREFLIGHT
E. F. Insert Engine into rocket.
FLYING YOUR ROCKET
Choose a large field (250 ft.[76 m] square) free of dry weeds and brown grass.The larger
the launch area, the better your chance of recovering your rocket. Football fields and
playgrounds are great. Launch only with little or no wind and good visibility.
Always follow the National Association of Rocketry (NAR) SAFETY CODE.
MISFIRES
TAKE THE KEY OUT OF THE CONTROLLER. WAIT ONE MINUTE BEFORE GOING
NEAR THE ROCKET! Take the plug and igniter out of the engine.If the igniter has burned,
it worked but did not ignite the engine because it was not touching the propellant inside
the engine.Put a new igniter all the way inside the engine without bending it. Push the
plug in place.Repeat the steps under Countdown and Launch.
NAR Safety Code
NO DRY
GRASS
OR WEEDS
KEY ALWAYS OUT UNTIL
FINAL COUNTDOWN!
HOLD KEY DOWN AND PRESS
LAUNCH BUTTON UNTIL LIFT-OFF!
4...
4...
15 FT. (5 M)
4... 3...2...1...
INSERT KEY.
PUSH DOWN
AND HOLD.
PRECAUTIONS
© 2002 Centuri Corp. All rights reserved. PN 82137 (1-02)
1...
1...
LAUNCH
BUTTON
LAUNCH SUPPLIES
(sold separately):
• Porta-Pad®II Launch Pad
• Electron Beam® Launch Controller
• Recovery Wadding
• Igniters (w/ engines)
• Igniter Plugs (w/ engines)
• Recommended Estes Engines:A8-3, B4-4,
B6-4, C6-5.
D.C.
A.
C. Fold. D. Roll.
E. Wrap lines
loosely, insert
Parachute,
Shock Cord and
Nose Cone into
Body Tube.
A. Insert 3 or 4 loosely crumpled
squares of RecoveryWadding.
B. Spike.
2...
2... 3...
3...
page 4
To avoid serious injury,
read instructions & NAR
Safety Code included with
engines.
PREPAREYOUR ENGINE
ONLY WHENYOU ARE
OUTSIDE ATTHE LAUNCH
SITE PREPARINGTO LAUNCH!
If you do not use your prepared
engine, remove the igniter before
storing your engine.