Madcow Rocketry ARCAS HV User manual

ARCAS HV
Specications:
Length: 52.25”
Diameter 2.6”
Weight: 34oz
Recovery: 30” Nylon Chute
Motor Mount: 38mm
Fins: 4 - 1/16” G10
Recommended CG: 40”
Suggested Motors:
Aerotech Cesaroni
G67R-6 1070’ G115WT-8 1440’
H148R-10 2150’ H143SS-10 2430’
Parts List
1. (1) Fiberglass nose cone
2. (1) G10 coupler bulk plate
3. (1) Fiberglass coupler
4. (1) Pre-slotted body tube
5. (1) Forward body tube
6. (2) G10 centering rings
7. (1) 38mm motor tube
 8. (4)G10ns
9. (2) Eyebolts, (3) nuts, (1) washer
10. (1) Nylon shock cord
11. (2) Rail Buttons and Screws
12. (1) Vinyl Decal
Optional Recovery System
 1. (1)9”x9”ameproofchuteprotector
2. (1) 30” Nylon chute
Required to complete: 5 minute epoxy, 120/220
sandpaper,maskingtape, nishingller/paint,
RubbingAlcoholforcleaning.
®
K-144
898666 00144 4

2 ©2010 MadCow Rocketry™ ARCAS 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.
Fiberglasspartsstillcontainsmallamountsofmoldreleaseandothermaterialsonthe
surfacethatwillinhibitadhesivesand/orpaint.Itisimportanttocleaneachpartprior
toassemblywithasolutionof1partrubbingalcohol,3partswaterandadropofdish
washingsoap.IMPORTANT:donotsandanypartsuntilafteryouhavecleanedthem-
youwillembedthematerialsyouaretryingtocleanmakingitdifculttoclean.
TheG10partswillhaveholdingtabsleftoverfromtheCNCmachine.Thesesmalltabs
willneedtobesandedoffbeforeassembly.Beforeassemblinganypartwithepoxy,
roughupthesurfacetobeepoxiedusingcoursesandpaper.ThescratchesintheG10
surfacewillgivetheepoxysomethingtograbonto.
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.Theringwiththe1/4”hole
foraneyebolt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”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 test t one of
the ns to make sure there is enough room for the n tang between the centering
rings.
Mount the eyebolt using the two nuts
asshownintheforwardringhole.
Apply some epoxy to the nuts to
ensure they will not come loose later.
Attachoneendoftheshockcord
to the eyebolt using an overhand
knot. IMPORTANT: Make sure
the eyebolt and nut are aligned
properly so the motor assembly
can slide into the body tube.
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.
1/2” Exposed
1” Exposed
Forward Ring Hole
Fin Tang
Ensureringsareclearofthenslots

ARCAS Assembly ©2010 MadCow Rocketry™ 3
Step 4 – Rail Button Attachment
Drilla5/64”holeontherailbuttonlinefortheforwardandaftrailbuttons.Theafthole
shouldbe1/2”fromtheaftendoftheaftbodytubeandtheforwardholeshouldbe9”
aftofthefrontoftheaftbodytube.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.
IMPORTANT: Make sure the forward rail button screw protruding through the body
tube doesn’t snag the chute. Epoxy over the screw to provide a smooth surface.
The screw can also be cut shorter.
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.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 – Balance and Nose Cone Assembly
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rocketbalancesinfrontoftherecommendedCGinthespecicationsontherst
page.TheCGshouldbemeasuredfromthetipofthenosecone.Iftherocketbalances
aftoftherecommendedCGpoint,addweightinsidethenoseconeandsecurewith
epoxyuntiltherocketbalancesatorinfrontoftherecommendedpoint.Whenyouare
satisiedwiththebalanceoftherocket,epoxythenoseconeintotheforwardendofthe
frontbodytube.
1” Exposed
Fin Tang
Step 5 – Forward Section Assembly
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.
Ensureringsareclearofthenslots
Nextmarkthecoupler2.5”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3.5”ofcoupler
exposed. Make sure the coupler is straight and
the body tubes are aligned properly when they
are assembled later.

24338 El Toro Rd #E-134
Laguna Woods, CA 92637
949.547.8847
www.madcowrocketry.com
©2006 MadCow Rocketry™
®
Step 7 – Flying Your Model
Attachtheendoftheshockcordandthe
parachutetotheforwardeyebolt.Youcan
also attach the chute protector to the shock
cord just below the eyebolt. 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 in the motor
tube. Failure to use motor retention may
allow the motor to be ejected during the
ejection charge instead of the parachute,
making for a dangerous ballistic reentry.
IMPORTANT: always remember to check
your balance point and ensure your
rocket balances at or forward of the
recommended 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.
7”
8.5”
35.5”
34”
1.3”
Wide
Nose Cone Base