Madcow Rocketry Squat User manual

Squat™
Specications:
Length: 28.5”
Diameter 4.0”
Weight: 30oz
Motor Mount: 54mm
Fins: 3 - 1/4” Plywood
CG: 19” from nose tip
Estimated CP: 23” from nose tip
Parts List
1. (1) Nose Cone
2. (1) pre-slotted body tube
3. (2) Centering rings
4. (1) 54mm motor tube
 5. (3)laser-cutns
6. (1) Eyebolt, nut and washer
7. (1) Nylon shock cord
8. (2) Rail Buttons and Screws
Required to complete: 5 minute epoxy,
120/220sandpaper,maskingtape, nishing
ller/paint,noseweight.
K-158
898666 00158 1
®

2 ©2010 MadCow Rocketry™ Squat™ Assembly Squat™ Assembly ©2010 MadCow Rocketry™ 3
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
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 1/2” of motor tube exposed. Make sure you clean the motor
tubeofanyepoxysoasnottointerferewiththentangslater.Aftertheaftringisdry,
make a mark 1/4” 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. Also make sure the
n tangs will t between the
two centering rings.
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 knot.
Step 3 – 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 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.
Step 4 – Rail Button Attachment
Drill a 5/64” hole on the rail button line for the forward and aft rail buttons. These holes
should go into the centering rings. Apply a small amount of epoxy in the holes and
attach the rail buttons using the supplied #6 wood 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 2 – Insert Motor Tube Assembly into Body Tube
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
1/2” Exposed
1/4” Exposed
Forward Ring Hole
Fin Fin Tang
Step 5 – Balancing 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 and adding
some epoxy. Hold the nose cone with the tip down so the weight will be as far forward
as possible. IMPORTANT: Screw in several screws through the plastic nose cone
into the lead to hold it in place. Grind or cut off the screw head before lling and
applying the nose cone nish. The epoxy will not stick to the inside of the nose
cone and if you do not anchor with screws, the liftoff force will cause the weight to
become dislodged causing an unstable model.
IMPORTANT: Proper CG is critical to the stability of this model.
This model will require some ballast in the nose - the amount will
depend on how you build and the size motor you use to y. Do
not y without balancing this model properly as a dangerous
unstable ight will result.

Step 6 – Flying Your Model
Attach the end of the shock cord and the parachute to the nose cone. You can
also attach the chute protector to the shock cord just below the nose cone.
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: always remember to check your balance point and ensure
your CG is forward 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.
24338 El Toro Rd #E-134
Laguna Woods, CA 92637
949.547.8847
www.madcowrocketry.com
©2010 MadCow Rocketry™
®