boat assignment

7/25/2019 Boat Assignment

1/13

ENGR101

Assignment 4 Cover Sheet

Individual Design & Build: he Aluminium !oil Boat

I confirm that the submission attached to this cover sheet is entirely my own work (apart fromgeneral verbal discussion with other students).

Signed: _____________________________

Name:

ID Num"er:

#sername:

Design Studio $%orsho'( num"er:

Due Date and ime: Tuesday 6 May 2!"# $ pm

Date and Time Received

(College Use Only)


2/13


3/13

Individual Design

and Build:

Aluminum Boat

ENGR101

Assignment 4

Jaco !a"y

Uni#e"sity o$ Cante"%"y

May 1st2014


4/13

Summary

&oats a"e man%$act%"ed and sold all a"o%nd t'e o"ld t'%s t'ei" indi#id%al

const"%ction is essential !e*endent on t'e *%"*ose o$ t'e oat its s'a*emay e alte"ed 'et'e" it+s %sed to ca""y a la"ge eig't o" is %ilt $o" s*eed

t'e man%$act%"ing o$ t'e oat is essential ,'e *"olem is to design and

%ild a oat %sing only al%min%m $oil t'at can 'old coins t'at o"t' ten Ne

-ealand dolla"s $o" one min%te ,'"ee di.e"ent oat designs 'e"e s/etc'ed

and %ilt %sing t'e same net a"ea o$ al%min%m $oil $o" $ai" testing to e in

*lace o" t'e "st test %sing a net a"ea o$ 100cm2 all t'"ee designs $ailed3

'oe#e" in inc"easing t'e net a"ea to 200cm2 and ens%"ing t'e ay in 'ic'

t'e coins e"e stac/ed as consistent it as t'e 5at '%ll6 design 'ic'

co%ld it''old t'e most eig't

Problem Statement

7n $%ll t'e *"olem states t'at indi#id%ally yo% m%st design3 %ild and

s%ccess$%lly test a oat solely made o$ t'e minim%m amo%nt o$ al%min%m

$oil *ossile to 'old ten Ne -ealand dolla"s+ o"t' o$ coins $o" at least si8ty

seconds ,'e sol%tion ill 'ig'lig't 'ic' s'a*e o$ oat can it''old t'emost mass d%e to only its %ni9%e design as t'e amo%nt o$ al%min%m $oil is

constant eteen #a"io%s oat s'a*es 7n te"ms o$ t'e s*ecications o$ t'e

e8*e"iment e m%st ens%"e all oat s'a*es a"e eing tested in a $ai" $as'ion3

t'%s t'e coins m%st all e stac/ed t'e same on t'e oat $o" e8am*le yo%

cannot stac/ all coins one on to* o$ t'e ot'e" $o" one oat and t'en *%t t'em

in 4 di.e"ent stac/s $o" t'e anot'e" oat s'a*e ,o contin%e t'e ay in 'ic'

t'e coins and t'e oat a"e *laced in t'e ate" m%st e t'e same t'"o%g'o%t

t'e e8*e"iment3 decide 'et'e" yo% *lace t'e oat in "st t'en t'e coins in

t'e oat o" *%t ot' t'e oat and t'e coins in as one and t'is m%st e t'e

same t'"o%g'o%t olloing t'is a"e t'e limitations o$ t'e test o%ld e

in#ol#ing *ossile lea/s and *%nct%"es in t'e oat conside"ing al%min%m $oil

is easily "i**ed ,o contin%e t'e com*le8ity o$ ce"tain designs o%ld limit

'at can e %ilt %sing al%min%m $oil t'e mo"e com*le8 ones eing me"e

im*ossile to ma/e %sing t'e mate"ials "est"icted to inally c"eating oats

t'at a"e e8actly t'e same to 'o t'ey e"e designed3 e#en in t'e case o$


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sim*le st"%ct%"ed oats ac'ie#ing *e"$ect symmet"y3 lengt's and t'%s

staility ill e a dic%lty

Research and Investigations

i"st t'e lig'test comination o$ coins to gi#e a #al%e o$ ten dolla"s m%st e

estalis'ed(1)

Coin ty*e (Ne

-ealand)

!iamete" (mm) ;ass(g)

,en cents 20< 400i$ty cents 24><


6/13

As seen in ig%"e 2 t'e %oyancy $o"ce is g"eate" t'an t'e

eig't t'%s alloing t'e oDect to 5oat3 i$ t'e eig't

s%cceeds t'e

%oyancy $o"ce

t'e oDect ill sin/ (2) Acco"ding A"c'imedes

*"inci*le t'e %oyancy $o"ce is e9%al to t'e eig't o$ t'e

ate" dis*laced y t'e oDect (=) ,'%s it is *"edicted t'att'e oat s'a*e 'ic' 'as t'e ca*acity to dis*lace t'e most ate" ill 'old

t'e most eig't ,'e"e$o"e o%t o$ t'e t'"ee oat s'a*es c'osen t'e long

ide '%ll const"%ction o$ t'e 5at '%ll design ill conse9%ently 'a#e t'e

g"eatest ma8im%m %oyancy $o"ce alloing t'e oat to ca""y t'e most

eig't

7t is a common misconce*tion t'at all lig't oDects ill 5oat on ate" and all

'ea#y oDects ill sin/ oe#e" t'is is "ong it is in $act t'e density o$ t'eoDect %nde" e8amination 'ic' dete"mines 'et'e" an oDect ill 5oat in

ate" o" not As e /no density is t'e amo%nt o$ mass *e" %nit #ol%me3

t'%s t'e oats density m%st e less dense t'an t'e density o$ ate" 'ic' is

100g"amFcm=6 ,'is can e calc%lated $o" all oat s'a*es e$o"e tested in

ate" so it' t'is yo% can *"edict 'et'e" t'e oat ill 5oat o" not

Alternative solution

i"st design ,'is initial design as a canoe s'a*e it' a "o%nded /eel '%ll

,'is as t'e "st s'a*e %sed d%e to t'e oats de*t' ,'is is also a #e"ycommon s'a*e $o" a oat t'%s as a "eason $o" its c'oice ,'e oat as

tested %sing 10 y 10 cm $oil and $ailed sin/ing immediately 'en *lacing

coins in one y one t'e canoe o%ld e %nstale and sin/ on one side 7n

do%ling t'e al%min%m $oil %sed to 10 y 20 cm and *lacing t'e coins in t'e

oat "st and t'en t'e oat and t'e coins toget'e" in t'e ate" %sing a

s*at%la *lace t'e oat in t'e ate" in t'e most stale ay3 t'e oat 'eld all

eig't o"ce

Figure ": Relationshi# beteen Buoyancy $orce and


7/13

< to dolla" coins $o" @0 seconds Using inc"ements o$ 20 cent *ieces t'e

oats ma8im%m eig't as $o%nd to e


8/13

20cm net $oil as in t'e design one t'is is also %sed in design t'"ee it' t'is t'e 5at

'%ll design managed to 'old #e 2 dolla" coins $o" si8ty seconds it' a ma8im%m

eig't o$ 10?Hg"ams e$o"e sin/ing %"t'e"mo"e %nli/e in design one t'e oat as

easie" to c"eate in a stale symmet"ical ay d%e to its

,'i"d design ,'is design as c'osen in attem*t to me"ge ot' design one and

to+s oat s'a*es toget'e" 7t 'as a *a"allelog"am st"%ct%"e 'ic' is e9%ally dee*as it is ide and long oe#e" in *"actice t'is oat st"%ct%"e as t'e ea/est

lasting only >2< seconds ca""ying #e to dolla" coins it as an %ns%ccess$%l

Stac/ed again so t'at all coins a"e to%c'ing t'e ase o$ t'e oat t'%s no coins a"e

stac/ed on to* o$ one anot'e"3 stac/ing *"ocesses 'ic' 'a#e een delie"ately

/e*t constant t'"o%g'o%t t'e testing o$ all t'"ee designs $o" t'e tests to e $ai"

=d

0H


9/13

E#al%ation ;at"i8

I"o*e"ty eig't Canoe lat %ll Ia"allelog"am

Sco"e eig'te

d sco"e

Sco"e eig'te

d Sco"e

Sco"e eig'te

d Sco"e;inimi

es

Iotential

$o" lea/s

2 4 ? < 1) 2 4

;a8im%

m load

'eld

4 4 1@ < ") 1 4

Staility = = H < 1* 4 12S%**o"t

s

"e9%i"ed

load

(


10/13

,otal Kol%me o$ lat %ll !esign: KB 2d L =d L 0H4)

(H?1) B 1041N is t'eoats ma8im%m

%oyancy $o"ce (@)

/onstruction0

Analysis and

Testing

,'e oat as

const"%cted %sing

20cm y 10cm o$

al%min%m $oil 'ic' as $olded don to gi#e t'e dimensions o$ 2H


11/13

g"ams o$ coins and it ma8im%m load to ens%"e t'e test "es%lts e"e

acc%"ate3 t'e oat as le$t to d"y eteen tests to con"m no ate" as

st%c/ to t'e oat t'at co%ld eig' it don Also noted t'at t'e test $ailed

it' a 10 y 10 cm $oil as t'e coins e"e $o"ced to e stac/ed on to* o$ one

anot'e" and t'e eig't as concent"ated in a single a"ea ma/ing it %nstale

and easily s%n/ ,'e "es%lts s'oed a la"ge load ca*acity in com*a"ison it'

t'e ot'e" oats 'ic' as to e e8*ected d%e to its la"ge #ol%me and stale

symmet"ical s'a*e

Final valuation7n s%mma"y t'e design did sol#e

t'e *"olem it'in t'e

s*ecications and limitations 7n

nding t'e est s%itale oat

s'a*e to 'old a ma8im%m load

t'e 5at '%ll design did D%st t'at

'olding %* to 10?g"ams o"t' o$

coins it'o%t lea/ing o" ti**ing to one side d%e to instaility Alt'o%g'

*e"'a*s t'e s'a*e o$ t'e oat o%ld not o"/ in "eal o"ld designs $o" t'econst"aints o$ t'e e8*e"iment it as a s%ccess in its design $o" 'olding

eig't 7n "e*eating t'e *"olem "esea"c'ing mo"e into a oat s'a*e t'at

'as a conca#e ottom "at'e" t'an a 5at to dis*lace e#en mo"e ate" and

allo t'e oat to ca""y mo"e eig't3 $%"t'e" "esea"c' co%ld 'a#e also een

done in ma8imiing t'e #ol%me o$ t'e oat to its $%ll *otential in o"de" to

inc"ease its o#e"all ma8im%m %oyancy $o"ce


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Personally the design process overall was helpful individual to me due to the

fact it helped my skills in carrying out a test in an in-depth manner, viewing

each aspect of the test from various angles to discover a reliable solution

within the specications and limitations of the test! "n terms of the tests

actual goal and indeed identifying what the true problem made it hard to

detect what way to steer the report was a di#culty! $urthermore the actual

building and testing of the boat posed accessional problems because of the

delicacy of the material in use! %owever inclusive the test and report

established good basic understanding in the eld of individual build and

design!

Re$erences

(1) eig'ts and diamete"s o$ N- coins'tt*:FF"ngo#tnFnotes_and_coinsFcoinsF01014


13/13

boat assignment

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