Model Rockets BOOSTAR-C User manual

Assembly Instructions
Parts Included:
1 Stage Tube
3 Laser Cut Balsa Fins
1 Trust Ring
1 Motor Tube
1 Launch Lug
1 Motor Hook
2 Centering Rings
1 Decal Sheet
Materials (not Included):
Yellow ood or hite Glue
Sanding Sealer
Paint Brush
Sandpaper (#240 grit)
Gloss Spray Paint
Primer Spray Paint
Masking Tape
Motor Mount Assembly
Step 1 – Insert the flat end of the metal
motor hook into the pre-cut slot ¼” from the
end of the motor tube.
Step 2 – Slightly expand the inside of the 2
larger centering rings by twisting on the end
of the nose cone. Important: Don’t expand
the smaller trust ring.
Step 3 – hile holding the motor hook in
the slot, apply glue around the motor tube
between the marks. Push the expanded end
of the centering rings over the motor hook
until the rings are between the marks on the
motor tube.
The rings should be positioned as shown
Step 5 – Apply glue around the outside of
the thrust ring and insert into the motor tube
at the end where the motor hook is inserted.
Push in until against the motor hook and flush
with the end of the motor tube.

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Inserting and Attaching
the Motor Mount
Step 1 – Refer to the drawing below to
locate the bottom of the stage tube by the
1 1/8” fin slot distance. Using a Q-tip or your
little finger apply glue liberally around the
inside end of the stage tube ½” in at the end
of the slotted for the fins.
Important: Do the following motor mount
insertion in one move. Do not stop until the
motor mount is in the correct position.
Step 2 – Insert the motor mount and push
in until the bottom of the motor tube is flush
with the bottom on the stage tube. Both rings
should be clear of the fin slots. Clean any
residue glue from the slots and set aside to
dry.
Attaching the
Staging Coupler
Step 1 – Using a Q-tip or your little finger
apply glue liberally around the inside end of
the stage tube at the end opposite the motor
hook.
Step 2 – Insert the coupler and push in
until the end of the coupler is ½” from the
end of the stage tube. ipe off any glue on
the coupler with a dry paper towel.
Preparing and
Attaching the Fins
Step 1 – Press or break out the balsa fins
from the laser cut sheet.
Step 2 – Sand the leading edge and the tip
of each fin round. Leave the root of the fin
where it inserts and attaches to the body tube
square.

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Step 3 – Apply a bead of glue to the root
edge on each fin and insert the root tab of
each fin into the fin slots on the stage tube.
The middle root edge of the fins should glue
against the motor tube inside and the front
and rear root edge against the stage tube
outside.
Step 4 – Apply a thin bead of glue along the
length of the launch lug and attach to the
stage tube and fin where the launch lug line is
marked. Allow to dry for ½ hour or more.
Important: Keep the fins and the launch
lug aligned while drying. Make sure the fins
are aligned 120 degrees apart. Use the fin
guide on this page to align the fins while
drying.
Preparing and
Attaching the Fins Continued…
Step 5 – After the fins and launch lug have
dried, apply a thin layer of glue between the
body tube and the fins, and the body tube and
launch lug with your finger to create a fillet
that will strengthen the fins and launch lugs.
Set aside to dry. Check the fin alignment to
make sure they are 120 degrees apart while
drying.
Finishing Your Rocket
(Optional
Step 1 – Using #240 grit sandpaper, sand
the fins of the rocket lightly to remove loose
grain and sand the nose cone so that the
paint will stick.
Step 2 – Apply sanding sealer to the fins
and let dry. Sand the fins with #240 grit
sandpaper between coats of sanding sealer.
Re-do this process until the fins are smooth
and the balsa grain is filled.
Step 3 – Using masking tape, mask off the
coupler so that spray paint is not applied
during priming and finish coat.

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Finishing your roc et cont…
Step 3 – Roll up a sheet of paper and insert
into the bottom of the stage tube to hold your
rocket booster, apply a thin coat of flat white
or gray primer spray enamel to the whole
rocket booster using even back and forth
movements. Let the primer dry and sand
using #240 grit sandpaper. Re-coat and sand
as necessary.
Step 4 – Apply a first thin color coat of
gloss spray enamel to the whole rocket
booster using even back and forth
movements.
Let the first coat tack up for a few minutes.
Then follow up with a heavier coat. Do not
coat too heavily or the paint will sag. The best
results are obtained when the color coat is
just thick enough to gloss. If additional coats
are needed to cover the primer with full color,
re-apply after the color coat has tacked up
within the first hour or wait 24 hours until the
color coat is completely dry. Let the final coat
dry for 24 hours.
Step 5 – Remove the masking tape from
the coupler.
Step 6 – Remove the pressure sensitive
decals from the backing paper and apply to
the fins and body tube. Use the picture on the
cover of this manual for a guide to decal
placement.
Flying Your Rocket Booster
The Boostar-C is designed to be a booster
stage for any of the ModelRockets.us single
stage rockets that use a .99” diameter body
tube. This includes the following rockets:
Centauri Roc et
Sword Payload Roc et
Flight chec list:
□ Boostar-C Rocket Booster
□ Single Stage Model Rocket
□ Launch Pad & Controller w/Batteries
□ Recovery adding
□ Model Rocket Motors and Igniters
Recommended Motors:
Boostar-C B6-0 & C6-0.
Centauri A6-4, A8-5, B6-4, B6-6, C6-5, C6-7.
Sword A6-4, A8-3, B6-4, C6-5.
Step 1 – Trial fit the booster coupler into
the end of the single stage rocket. If the fit is
too tight sand the coupler with #240 grit
sandpaper until the coupler slides in with
some friction, but still can be removed. If it is
too loose, add some masking tape to create a
friction fit.
Step 2 – Prepare your single stage rocket
according to the instructions supplied with
your single stage rocket kit.
Important: Insert the single stage motor
without the igniter. The igniter will be
installed in the booster stage instead.
Step 3 – Insert the Boostar-C rocket
booster all the way into the single stage
rocket. Align the launch lugs of the booster
stage and the single stage rocket by twisting
the booster stage in the single stage rocket.
Step 4 – Install model rocket motor igniter
into the booster rocket motor according
manufacturers recommended procedure.
Step 5 – Insert the booster stage rocket
motor with the nozzle/igniter end facing the
rear of the rocket. The motor should clip into
place with the motor hook retaining the
motor.
IMPORTANT: FOLLO THE N.A.R.
SAFETY CODE REGARDING
LAUNCHING AND THE USE OF MODEL
ROCKET MOTORS