permanent roto-copter (a variation of the toy helicopter) · 2016. 6. 5. · (at recsam science lab...

1 2015/08 © Hideo Nakano [email protected] PERMANENT ROTO-COPTER (A variation of the toy helicopter) Introduction At any schools Roto-copter is one of the most popular low-cost science activities. We can also use a simple arm extension to drop the copter from higher place; we call it Roto-copter dropper. In order to provide safe and fun science activities we modified the toy to make it suit the dropper. But usually we can enjoy the copter only few seconds. Can we make a copter which keeps on rotating? Some science centre websites show copter samples which keep on rotating using thin string. But it is difficult to avoid super-twisting or untwisting of the string with everyday materials. Therefore, we gave up using string and tried applying a different rotation axis and an axis holder, namely, a bamboo skewer and a thin plastic straw. Please read how to make a “Permanent Roto-copter” from next page. Indonesian teachers playing with the Roto-copters and the droppers. (at RECSAM science lab 2 on 29th Oct 2013) Explaining how to make an old version copter. (at SEAMEO Hall on 18th Mar 2015) The string was super-twisted or untwisted. Materials and tools Materials Tools Copter pattern sheets (6 copters on a sheet), 4.0 mm in diameter plastic straws, 5.0 - 6.0 mm in diameter plastic straws, and bamboo skewers A cutting mat, a cutter, a pair of scissors, a ruler double-sided sticky tape (18 mm in width), insulation tape (18 mm in width), and sticky tape

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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