Call for proposals

  • Call for proposal announcement: 23 February 2017
  • It was announced using LAPAN website, unversities (by flyers), and schools (by email and study-visitation)
  • The acceptance closed 21 April 2017


Proposals and Initial screening

  • 31 proposals were accepted, all of them are Kategory 1
  • Initial screening was held on 10 May 2017
  • Proposal’s reviewer are from LAPAN:
    • Clara Y. Yatini (astronomy)
    • Rasdewita Kesumaningrum (astronomy)
    • Fitri Nuraeni (geophysics)
    • Emmanuel S. Mumpuni (astronomy)
    • M. Muhammad Musafar K. (Physics)
    • Mira Juangsih (Mathematics)
    • Siska Filawati (Physics)


Selected Proposals

1. ID17 "Gravity vs. air resistence"

2. ID28 "Balloon rocket in zero Gravity"

3. ID21 "Returning trajectory of paper boomerang"

Hypothesis: The parachute and the weight will move in the direction of applied force. It is because when the gravity is zero, then the weight will be zero.

The movement of the parachute will be slower than because the air which a parachute collides with, there is the air resistance force.

  • In experiment 1 the parachute will stay.
  • In experiment 2 the parachute will move to above.
  • Experiment 3 the parachute will move down.
  • Experiment 4 the parachute will move to above.
  • Experiment 5 the parachute will move to above
  • Experiment 6 will also move to above.


  • The returning trajectory of a boomerang involves the aerodynamic lift of its airfoil shape plus the gyroscopic precession associated with its rapid spin.
  • The precession redirects the airfoil so that it "flys" around the returning path.
  • Boomerang is basically just two wings stuck together and both generate lift that keeps the boomerang in the air.
  • As the boomerang is rotating the top actually rotates with the direction the boomerang is moving while the bottom is rotating in the opposite direction so air flows faster over the top of the boomerang creating more lift.




Hypothesis: the boomerang will "fly" higher in zero gravity condition than in the earth. Because there's no gravitational force, the weight of the boomerang equals to 0.

  • Even if we throw it too low or too weak, it won't fall to the ground.
  • If we throw too high, it will touch the ceiling.
  • If we throw straight, it will fly higher than in earth.


Experiment :

A4 printing paper 80gsm

  • Made of a half a4 printing paper 80gsm
  • Weight 2 gr
  • Every arm 14.8 cm length
  • Light and stiff

Batik paper craft (1)

  • Made of batik paper craft 70 gsm
  • Weight 4 gr
  • Every arm 18 cm length
  • Bigger size need less force to throw but fragile, tend to fly out of its trajectory after several throws

Batik paper craft (2)

  • Made of batik paper craft 70 gsm resize to half a4 size
  • Weight 2 gr
  • Every arm is 15 cm length
  • Light but less stiff than A4 printer paper boomerang, more fragile and tend to fly out of its trajectory after several throws

How to throw

  • Hold the boomerang with the middle line is on top
  • Stand with body face to your left (the boomerang made for right arms)
  • Use your wrist to spin the boomerang
  • Do not use force, let it fly casually


Launch Item

  • 5 sets of following ALL boomerangs
    • A4 printing paper boomerang
    • Batik paper craft (1) boomerang
    • Batik paper craft (2) boomerang
    • Origami paper boomerang

For the white boomerang :
it made of A4 80 gsm 210 x 297 mm premium multi purpose paper
Brand : Bola Dunia
produced by PT. Pindo Deli Pulp and Paper Mills, Karawang, Jawa Barat,
Indonesia (
For the Batik boomerang :
Paper craft 63.5 cm x 49.5 cm
Product name/brand : Sansan Wawa paper craft
Produced by PT. Indah Bumi Sanwa Jaya (website:
Product number 11006-2070 paper craft

  • Proposal Title  : Returning Trajectory of Paper Boomerang
  • Proposer  : Laurentius Feliks Christmarines
  • Age/Category  : 16/1
  • School   : Senior High School 1 Batam, Indonesia
  • Awards  : Certificate and Trophy