Madcow Rocketry Patriot User manual

Specications:
Length: 52.5”
Diameter 4.0”
Dry Weight: 53oz
Recovery: 36” Nylon Chute
Motor Mount: 38mm
Fins: 4 - 1/4” Plywood
CG: 32” from nose tip
Parts List
1. (1) Nose Cone
2. (1) Pre-slotted body tube
3. (1) Forward body tube
4. (1) Coupler
5. (1) Bulkhead
6. (2) Centering rings
7. (1) 38mm motor tube
 8. (4)laser-cutns
9. (2) Eyebolt, nut and washer
10. (1) Nylon shock cord
11. (1) 12x12 Chute Protector
12. (1) 36” Nylon chute
13. (2) Rail buttons and screws
14. (1) Vinyl Decal
Required to complete: 5 minute epoxy, 120/220
sandpaper, masking tape, lead weight to
balance,nishingller/paint.
K-134
Patriot
898666 00134 5

2 ©2007 MadCow Rocketry™ Patriot Assembly
Please make sure you read all directions and understand how to assemble your model
beforeyoustartconstruction.Itisalsoagoodideatotestteachpartbeforeassembly
–somemanufacturingtolerancesmayrequirelightsandingbeforenalassembly.
Laser cut parts will exhibit varying amounts of charring on the edges depending on the
density of the plywood. The charred edges do not interfere with bonding and do not
need to be cleaned before assembly. In most cases the charring will be cleaned up
duringsandingfornishingandpainting.
Step 1 – Motor Mount Assembly
Roughsandthemotortubesotheepoxywillstickbettertothemotortube.Testt
thecenteringringsoverthemotormounttubeandsandifnecessary.Alsotesttthe
centering rings in the body tube and sand if necessary. One of the rings will have a
hole for an eyebolt to attach the shock cord - this will be the forward ring. Spread some
epoxy on the outside of one end of the motor tube and slide the ring (without the hole)
until there is approximately 1/4” of motor tube exposed. Make sure you clean the motor
tubeofanyepoxysoasnottointerferewiththentangslater.Aftertheaftringisdry,
make a mark 2” from the other end of the motor tube. Spread some epoxy on the motor
tube and slide the forward ring until it aligns with the mark. VERY IMPORTANT: make
sure there is not any epoxy on the motor tube that would interfere with the n
tangs later on. Mount the eyebolt using the nut and washer in the forward ring hole.
Apply some epoxy to the nut to ensure it will not come loose later. Attach one end of the
shock cord to the eyebolt using an overhand knott.
1/4” Exposed
2” Exposed
Forward Ring Hole
Fin
Fin Tang
Step 2 – Body Tube Assembly
Wrap the shock chord into a small bundle and stuff it inside the motor tube for this next
step.Testtthemotortubeassemblyintothebodytubetoensureasnugt.Sandthe
centeringringsifnecessary.Whenyouaresatisedwiththet,spreadsomeepoxyon
the inside of the body tube and slide the forward centering ring of the motor assembly
into the body tube. Make sure you have the motor assembly facing the right way!
Spread some more epoxy on the inside edge of the body tube before sliding the rear
centering ring into the body tube. Continue
sliding the assembly inside the body tube until
the aft end of the motor tube is even with the
aft end of the body tube. It’s a good idea to
testtanineachslotherebeforetheepoxy
sets. Hold the body tube with the motor tube
assembly down until the epoxy sets. Make
sure the weight of the motor assembly doesn’t
cause it to slide out of alignment.
Ensure centering rings are
clearofthenslots

Patriot Assembly ©2007 MadCow Rocketry™ 3
Step 4 – Fin Assembly
Step 3 – Forward Section Assembly
Using a door jam or small section of angle stock, pencil a line halfway between two of
thensthatextendsfromthefronttothebackofthebodytube.Thislinewillbeused
later to align the rail buttons.
Testteachofthensintotheprecutnslots.Thenshouldseatrmlyagainstthe
motortube-sandeachnifnecessary.Whenyouaresatisedwiththet,applysome
epoxytotheendofthentangthatwillcontactthemotortubeaswellasthenrootthat
willcontactthebodytube.Also,spreadathinlayerofepoxyoneachsideofthentang.
Slidethenintoplaceandcheckthealignment.Continuerecheckingthenalignment
untilyouaresuretheepoxyhasset.Cleananyexcessepoxyfromaroundthenjoint.
Repeatfortheremainingns.
Next,applyepoxylletstobothsidesofeachn.Carefullysmooththeepoxylletswith
yourngerbeforetheepoxysets.Alloweachllettosetbeforerotatingtheairframefor
thenextllet.
Insert the eyebolt through the hole in the center of the bulkhead and secure using the
washer and nut. IMPORTANT: Apply some epoxy to the nut and eyebolt threads
to ensure the nut doesn’t come loose later. Apply some epoxy to the inside of the
coupler and push the bulkhead in so there is about a 1/8” to ¼” of coupler exposed.
Aftertheepoxyhasset,applyalletofepoxyaroundtheinsideedgeofthecoupler
bulkhead joint.
Next mark the coupler 2” from the forward edge. Apply some epoxy to the inside of the
forward body tube section and slide the coupler up to the mark. There should be 4”
of coupler exposed. Make sure the coupler is straight and the body tubes are aligned
properly when they are assembled later.
Step 5 – Rail Button Attachment
Drill a 1/8” hole on the rail button line for the forward and aft rail buttons. The holes
should go into the forward and aft centering rings. Apply a small amount of epoxy in the
holes and attach the rail buttons using the supplied 8-32 screws. Make sure the screw is
loose enough for the rail button to spin freely - this ensures the button is not compressed
to the point it will hang on the rail guide.
Step 6 – Flying Your Model
At this point, pack the chute and assemble the rocket. Insert the largest motor
thatyouintendtoy(orsimulatetheweightwithanappropriatesubstitute)and
ensurethattheCGisforwardofthepointdenedinthespecicationsonthe
rstpage.TheCGshouldbemeasuredfromthetipofthenosecone.Ifthe
CGisbehindthespeciedpoint,addweightinsidethenoseconebypouring
lead shot into the nose cone, adding some epoxy and sealing the hole with a

24338 El Toro Rd #E-134
Laguna Woods, CA 92637
949.547.8847
www.madcowrocketry.com
©2006 MadCow Rocketry™
1/4” screw. Make sure you hold the nose
cone with the tip pointing up while the
epoxy cures so all the weight will be in the
shoulder of the nose cone. IMPORTANT:
the epoxy will not stick to the inside of the
nose cone and if you attempt to epoxy the
weight to the tip of the nose cone, the liftoff
force may cause the weight to become
dislodged causing an unstable model.
Whenyouaresatisedwiththebalance
of your model, attach the nose cone to the
forward section of the forward body tube
using epoxy.
When packing your chute, wrap the chute
protector around the chute with the opening
in the chute protector facing forward.
Always make sure your chute is well
protected as the hot ejection motor gasses
will melt the nylon chute.
NOTE: drill a small 1/8” hole in the
chute compartment to allow venting.
IMPORTANT: always use positive motor
retention to secure the motor.Failure to
use motor retention will cause the motor
to be ejected instead of the parachute
making for a dangerous ballistic reentry.
IMPORTANT: always remember to check
your balance point and ensure your CG
is ahead of the specied CG point.
Atthispointyourmodelisreadytoy.
Always follow the NAR safety code and
remember that rockets are not toys and
can be dangerous if not prepared and
used properly. If you are a beginner, it is a
goodideatoywithacluborothergroup
of experienced rocketeers until you have
gained some experience.
Now go have some fun!
Nose Cone
Base
Red 3” Wide
Yellow 7 1/4”
Wide
Black 1 3/4”
Wide
Black 1 3/4”
Wide
Black
1 3/4” Wide,
6” Long,
4 equally
spaced
around tube
6” From Aft
End - Note:
thenswill
encroach
into the black
stripe
Body Tube
Break