building rubber powered indoor duration
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Building Rubber Powered Indoor Duration. Workshop - POLBAN Bandung, 7 April 2007. Introduction. Pesawat model bertenaga karet merupakan salah satu bagian dari cabang olah raga kedirgantaraan (Aeromodelling) Umumnya pesawat model bertenaga karet termasuk dalam kategory “free flight”. - PowerPoint PPT PresentationTRANSCRIPT
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April 20, 2023 2007 Indoor Free Flight Community
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Building Indoor Duration
Building Rubber PoweredIndoor Duration
Workshop - POLBANBandung, 7 April 2007
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April 20, 2023 2007 Indoor Free Flight Community
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Building Indoor Duration
Introduction
• Pesawat model bertenaga karet merupakan salah satu bagian dari cabang olah raga kedirgantaraan (Aeromodelling)
• Umumnya pesawat model bertenaga karet termasuk dalam kategory “free flight”.
• Setelah pesawat dilepas, maka ia akan terbang sendiri sesuai dengan karakteristik aerodynamic-nya atau yang telah ditentukan oleh pembuatnya (berdasarkan kondisi trim).
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Building Indoor Duration
Introduction
Type: Scale/Sport
• Open (indoor/outdoor)
• Dime scale (16” span)
• Peanut (13” span)
• Pistachio (8” span)
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Building Indoor Duration
Introduction
Type: Indoor Duration• Science Olympiade (SO)
– Berat minimum 8 & 10 gram (tanpa karet)– Propeller harus plastik buatan pabrik– Cover kertas tissue– Wing span maksimum 45 cm, chord 5”
• F1L - EZB– Berat minimum 1.2 gram.– Propeller harus dari kayu balsa– Cover tidak boleh micro film– Wing span maksimum 45.8 cm, chord 7.6 cm
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Building Indoor Duration
Introduction
Type: Indoor Duration• F1M
– Berat minimum 3 gram (tanpa karet)– Cover tidak boleh micro film– Wing span maksimum 46 cm
• F1D– Berat minimum 1.2 gram (tanpa karet)– Berat karet maximum 0.6 gram– Propeller boleh rangka balsa– Cover boleh micro film– Wing span maksimum 55 cm, chord 7”
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Building Indoor Duration
Introduction
Type: Indoor Duration• Pennyplane
– Berat minimum 3 gram (tanpa karet)– Propeller harus kayu balsa– Motor stick kayu pejal tanpa penguat– Cover tidak boleh micro film– Wing span 45.6cm, chord 5”
• Ministick– Berat minimum 0.4 gam (tanpa karet)– Wing span ~ 7”.
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April 20, 2023 2007 Indoor Free Flight Community
Indoor Free FlightCommunity
Building Indoor Duration
Introduction
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April 20, 2023 2007 Indoor Free Flight Community
Indoor Free FlightCommunity
Building Indoor Duration
Introduction
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Building Indoor Duration
Where to Start?
• Untuk dapat membangun pesawat model bertenaga karet diperlukan beberapa alat dan material.
• Alat-alat bantu maupun material bisa didapat disekitar kita asalkan fungsinya sesuai dengan yang diperlukan
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Building Indoor Duration
Tools
• Building Board: soft board, plafon,dll
• Alat potong: cutter, silet, hobby knife
• Jarum pentul
• Kertas lilin, plastik
• Kertas tebal untuk pola (template)
• Tang
• Penggaris
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April 20, 2023 2007 Indoor Free Flight Community
Indoor Free FlightCommunity
Building Indoor Duration
Tools
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Materials
• Kayu balsa: 1/32”, 1/16”, 1/20”, 1/8”
• Kertas tissue, plastik Wrap
• Lem: Lem kayu, ambroid, Super glue
• Kawat piano: 0.4mm – 0.7mm
• Benang
• Karet ukuran: 1/16”, 3/32”, 1/8”
• Dll tergantung ide pembuat
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Indoor Free FlightCommunity
Building Indoor Duration
Materials
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April 20, 2023 2007 Indoor Free Flight Community
Indoor Free FlightCommunity
Building Indoor Duration
Materials
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Building Indoor Duration
Plans
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Building Indoor Duration
ConstructionsPlans & Template
• Buat gambar pola dengan skala 1:1• Buat pola sayap dan ekor datar dari kertas
tebal
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Building Indoor Duration
ConstructionsWing & HTP
• Buat bahan rangka sayap dari kayu balsa 1/16” (1.5mm)
• Buat rib dari pola dari balsa 1/16”
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Building Indoor Duration
ConstructionsWing & HTP
• Pasang batang rangka dan rib pada pola atau template. Jangan lupa pola ditutup pakai plastik atau kertas lilin agar lem tidak menempel ke pola
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Building Indoor Duration
ConstructionsCovering
• Setelah rangka kering, cover sayap dengan kertas tissue.
• Oleskan lem kertas pada rangka, lalu pasang tissue. Tarik tissue sampai tegang
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Building Indoor Duration
ConstructionsDihedral
• Buat dihedral setelah sayap dicover.• Takik pakai cutter & patahkan. Setelah
pada posisi yang benar tetaskan power glue.
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Building Indoor Duration
ConstructionsDihedral
• Atau buat sayap menjadi 2 bagian.• Satukan kedua bagian sesuai sudut
dihedral.
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Building Indoor Duration
ConstructionsShaft, Hook, & Bearing
• Buat poros propeller, kait belakang, dan bearing dari kawat piano.
• Bearing dapat juga mengunakan plastik cutton but.
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Building Indoor Duration
ConstructionsMotor stick
• Potong motor stick dari balsa 1/8” (3 mm) sesuai ukuran
• Untuk memperoleh kekuatan maksimum, potong motor stick sesuai arah serat kayu
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Building Indoor Duration
ConstructionsMotor stick
• Pasang bearing dengan menggunakan benang. Lalu oleskan power-glue pada bagian benang.
• Sebagai alternatif, belah bagian depan stick, lalu selipkan bearing dan dilem.
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Building Indoor Duration
ConstructionsPropeller
• Siapkan balsa tebal 1/32” atau paling tipis yang tersedia. Amplas setipis mungkin yang mampu dilakukan.
• Potong sesuai pola bilah propeller• Basahi dengan air, lalu tempel ke pipa diameter ~
4” dengan posisi miring 15-20o
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Building Indoor Duration
ConstructionsPropeller
• Siapkan spar pemegang bilah propeller sesuai dengan ukuran.
• Pasang bilah sehingga menghasilkan propeller pitch 1.5 – 2 kali diameter.
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Building Indoor Duration
ConstructionsPropeller
• Siapkan pemegang bilah propeller. Buat dudukan sehingga saat propeller terpasang, menghasilkan pitch sesuai yang diinginkan.
• Pasang bilah propeller ke propeller hub.
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Building Indoor Duration
ConstructionsAssembly
• Rakit bagian-bagian model sesuai dengan pola.
• Bila diinginkan dapat dibuat agar tiap-tiap komponen bisa dilepas.
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Building Indoor Duration
ConstructionsAssembly
• Bila perlu gunakan jig.
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Building Indoor Duration
FlyingPreparations
• Siapkan model dalam kondisi sudah dirakit.
• Pilih karet dengan ukuran yang sesuai.• Bila memungkinkan, pergunakan alat
bantu pemutar karet dan torsi meter.
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Building Indoor Duration
FlyingPreparations
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FlyingTrimming
10 LANGKAH TRIMMING
1. Tentukan posisi titik berat (Center of Gravity / CG). 2. Timbang model tanpa propeller dan karet untuk menentukan letak
CG. 3. Lepaskan model agar melayang (gliding). 4. Atur sudut dan posisi ekor datar agar diperoleh gliding yang baik. 5. Periksa kestabilan pesawat dengan sedikit menukik dan menanjak. 6. Bila perlu atur kembali posisi CG agar lebih stabil. 7. Beri tanda lokasi CG yang baru (bila dirubah pada langkah 6). 8. Pasang propeller dan karet, kemudian kembalikan CG pada posisi
seperti langkah 7. 9. Test terbang dengan tenaga karet secukupnya. 10. Atur sikap dan pola terbang dengan mengubah arah thrust.
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Building Indoor Duration
FlyingTrimming
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Building Indoor Duration
FlyingRubber characteristics
• Contoh karet 3/32”; 2 strand; 16.4”
Climb phaseCruise phaseDescend phase
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Building Indoor Duration
FlyingRubber winding
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Building Indoor Duration
FlyingRubber winding
Torque meter
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Building Indoor Duration
FlyingFlight Test
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April 20, 2023 2007 Indoor Free Flight Community
Indoor Free FlightCommunity
Building Indoor Duration
FlyingFlight Test
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Building Indoor Duration
FlyingFlight Test