permanent roto-copter (a variation of the toy helicopter) · 2016. 6. 5. · (at recsam science lab...
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2015/08©[email protected]
PERMANENTROTO-COPTER(Avariationofthetoyhelicopter)
IntroductionAtanyschoolsRoto-copterisoneofthemostpopularlow-costscienceactivities. Wecanalsouseasimplearmextensiontodropthecopterfromhigherplace;wecallitRoto-copterdropper. Inordertoprovidesafeandfunscienceactivitieswemodifiedthetoytomakeitsuitthedropper. Butusuallywecanenjoythecopteronlyfewseconds. Canwemakeacopterwhichkeepsonrotating? Somesciencecentrewebsitesshowcoptersampleswhichkeeponrotatingusingthinstring. Butitisdifficulttoavoidsuper-twistingoruntwistingofthestringwitheverydaymaterials. Therefore,wegaveupusingstringandtriedapplyingadifferentrotationaxisandanaxisholder,namely,abambooskewerandathinplasticstraw. Pleasereadhowtomakea“PermanentRoto-copter”fromnextpage.
IndonesianteachersplayingwiththeRoto-coptersandthedroppers.
(atRECSAMsciencelab2on29thOct2013)
Explaininghowtomakeanoldversioncopter.
(atSEAMEOHallon18thMar2015)Thestringwassuper-twistedoruntwisted.
Materialsandtools
Materials ToolsCopterpatternsheets(6coptersonasheet),4.0mmindiameterplasticstraws,5.0-6.0mmindiameterplasticstraws,andbambooskewers
Acuttingmat,acutter,apairofscissors,arulerdouble-sidedstickytape(18mminwidth),insulationtape(18mminwidth),andstickytape
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1.HowtomakeaPermanentRoto-copter
Printoutpatternsona70-80g/m2A4paperandcutout6modifiedcopterpatterns. Giveamountainfoldalongtheredline.
Givean“A”shapecutalongtheredline.
Turnthepatternsheetandpastedouble-sidedstickytape(18mminwidth)likethephotoabove. Removethestickerreleasepaper(whitepaper).
Paste100mmx18mminsulationtapestriponacuttingmat. Slicethetapetomakethreethinstrips.
Cutabambooskewerinto100mm. Ononeoftheendsoftheskewerwrapuponeofthetapestrips.
Cutathinplasticstraw(4.0mmindiameter)into60mm. Thencutitintothree3mmpartsanda50mmpart. (Pleasedonotworryabouta1mmlengthofthestraw.) Passtheskewerthroughstraws(two3mmparts,thenthe50mmpartandthethird3mmpart).
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Insertbareendoftheskewerintotheholeatthebottomofthemodifiedcopter.
Sandwichtheskewerwiththecopter.
Cutoffthetriangularshapes.
Collecta5.0-6.0diameterstraw(athickstraw). Theabovephotoshowshowtocutthestrawinordertomake3cmlonggutter.
Placethecopter’sthin50mmstrawattheborderofthegutterandtubularshapeofthethickstraw. Foldthegutterpartalongblacklinetomeettherightsideofthethickstraw.
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Applystickytapeontothethickstrawtoptofixthecopterfirmly.
Facethecoptertowardwind! NowyouhaveapermanentRoto-copter