Madcow Rocketry mini Patriot User manual

Specications:
Length: 21”
Diameter 1.6”
Weight: 8oz
Recovery: 18” Nylon Chute
Motor Mount: 29mm
Fins: 4 - 1/8” Plywood
CP: 15” from nose tip
CG: 13.25s” from nose tip
Recommended Motors:
Single Use Reloadable
D12-5* 455’ E16W-7 1380’
E9-6 * 848’ E23T-6 1006’
F20W-7 2011’ F52T-8 2274’
F23J-7 1763’ G64W-10 3308’
G79W-10 3070’ 51F36-9 (BS) 1696’
*Requires 29/24 adaptor 57F59-9 (WT) 1859’
56F120-9 (VX) 1837’
41F36-7 (SS) 1349’
107G83-9 (BS)2994’
93G80-9 (SK) 2817’
Parts List
1. (1) Nose cone
2. (1) Aft body tube
3. (1) Forward body tube
4. (2) Centering rings
5. (1) 29mm motor tube
 8. (4)laser-cutns
9. (1) Kevlar® shock cord section
10. (1) Nylon shock cord section
 11. (1)6”x6”ameproofchuteprotector
12. (1) 18” Nylon chute
13. (2) ¼” launch lugs
14. (1) Coupler
16. (1) Decal
Required to complete: 5 minute epoxy,
120/220sandpaper,maskingtape, nishing
ller/paint.
K-107
mini Patriot
898666 00107 9
®
23016 Del Lago, Unit C, Laguna Hills, CA 92653
949.547.8847
www.madcowrocketry.com
©2006 MadCow Rocketry™

2 ©2014 MadCow Rocketry™ mini Patriot Assembly mini Patriot Assembly ©2014 MadCow Rocketry™ 3
Step 3 – Forward Section
Mark the coupler 2” from the forward edge. Apply some epoxy to the inside of the front
of the aft body tube section and slide the coupler up to the mark. Apply some epoxy to
the inside of one end of the forward body tube and slide over the coupler. Observe the
mark to make sure the coupler stays centered between the two tubes. Make sure the
coupler is straight and the body tubes are aligned properly while the epoxy sets.
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
Step 2 – Insert Motor Tube Assembly into Body Tube
Testteachofthensintotheprecutnslots.Becauseplywoodthicknessvaries,you
may need to sand the slot to the correct width. 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 centering rings are just clear of the
nslots.It’sagoodideatotesttanineachslotherebeforetheepoxysets.Holdthe
Ensureringsareclearofthenslots
body tube with the motor tube assembly
down until the epoxy sets. Make sure the
weight of the motor tube doesn’t cause it
to slide out of alignment. IMPORTANT:
Make sure the forward end of the body
tube is clear of epoxy so the coupler
can go into the forward end of the aft
body tube.
Step 4 – Fin 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aftbodytube.Thislinewillbeused
latertoalignthelaunchlugs.Testteachofthensintotheprecutnslots.Then
shouldseatrmlyagainstthemotortube-sandeachnorslot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.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byapplyingathin
beadofepoxyatthen-bodytubejoing.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.
Step 6 – Balancing Your Model
Assembleyourmodelandinsertthelargestmotoryouintendtoy(orsimulatethe
weight with a substitute) and ensure that the CG is at least 1 body diameter in front of
theestimatedCPpointspeciedontherstpage.TheCPpointismeasuredfromthe
tip of the nose cone. If the CG is behind the desired point, add weight inside the nose
cone by pouring lead shot into the nose cone tip and adding some epoxy. You can drill
a 1/4” hole in the base of the nose cone to make it easier to pour lead shot and epoxy
inside the nose cone.
Testtcenteringringsoverthemotormounttubeandsandmotortubeifnecessary.Also
testtthecenteringringsinthebodytubeandsandifnecessary.Spreadsomeepoxyon
the outside of one end of the motor tube and slide the ring (without the notch) until there
is approximately 1/2” of motor tube exposed. Make sure you clean the motor tube of any
epoxysoasnottointerferewiththentangslater.IMPORTANT: 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.
Fin
Fin Tang
1/2” Exposed
IMPORTANT:
2” Exposed
Forward Ring Notch
Push cord in corner and
tack with epoxy
The shock cord in this kit consists
of a shorter section of Kevlar and a
longer section of nylon cording. The
two sections should be tied together
using a single overhand, ring bend
ordoublesherman’sknot.The
Kevlar section will be attached to
the motor mount and the nylon
section will be attached to the nose
cone.
Wrap the end of the Kevlar shock
cord around the forward end of the
motor tube and tack in place with
CA.Makesurethecordlaysat
enough so it will not interfere with
the body tube when you slide the
motor tube inside. Apply some
epoxy to the cord to hold it in place.
Make sure the cord is secure
and will not come loose later with
ejection forces that will pull on the
shock cord.
Step 5 – Launch Lug
Mark the CP point along the launch lug line you made in the previous step. Make sure
you measure the CP point from the tip of the nose cone and NOT the end of the body
tube. Apply a small amount of epoxy on the launch lug line about ¾” long on the CP
mark. Press one of the launch lugs into the epoxy and ensure that it is aligned with the
launch lug line previously drawn on the body tube. You can site down the tube and look
through the launch lug to make sure it is straight. Similarly epoxy the second launch
lugabout2”fromtheaftendofthebodytube(alignedwiththeaftendofthens).Site
down both launch lugs and make sure they are both aligned. If you have a ¼” launch
rod, you can use this to ensure that both lugs are aligned properly.

Step 7 – Flying Your Model
Attach the parachute to the shock cord
2/3 of the way between the nose cone
and body tube. You can also attach the
chute protector to the shock cord near the
parachute. 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.
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: some motors do not have a
thrust ring that rides against the back of the
motor tube. You can construct a thrust ring
by wrapping a ¼” wide strip of masking tape
around the aft end of the motor until you have a
layer of masking tape approximately the same
thickness of the motor tube. Do not y without
a thrust ring as the motor will y through the
rocket causing a dangerously unstable free
ying rocket motor.
IMPORTANT: always remember to check your
balance point and ensure your CG is ahead of
the specied CG point.
IMPORTANT: 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.
IMPORTANT: In no event shall Madcow
Rocketry be liable for any direct, indirect,
punitive, incidental, special consequential
damages whatsoever arising out of or
connected with the use or misuse of it’s
products. The buyer assumes all risk and
liability resulting from ANY use of any and all products sold by Madcow Rocketry. Your
purchase and use of any Madcow Rocketry product constitutes your agreement to and
acceptance of these terms. If you do not agree to these terms and conditions, you must return
the unused product in resalable condition for a refund or credit.
IMPORTANT: Please contact us via phone or email if you have any questions about
constructing or ying your model.
Nose Cone
Base
Red 0.75”
Wide
Yellow
3.25” Wide
Black 0.75”
Wide
Black 0.75”
Wide
Black
0.75” Wide,
1.5” Long,
4 equally
spaced
around
tube
Lines up
with leading
edge of the
ns.
23016 Del Lago, Unit C
Laguna Hills, CA 92637
949.547.8847
www.madcowrocketry.com
©2014 MadCow Rocketry™
®