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All Journal Jurnal Penelitian Saintek Momentum: Physics Education Journal
Yosaphat Sumardi
Universitas Negeri Yogyakarta
Decision Sciences, Operations Research & Management Physics

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AIR FLOW VISUALIZATION AROUND THE FLIGHT FLIGHT WINGS Yosaphat Sumardi
Jurnal Penelitian Saintek Vol 8, No 2: Oktober 2003
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (7598.165 KB) | DOI: 10.21831/jps.v8i2.5554

Abstract

This research is performed with objectives: (I) to show the patterns of velocity field  contour of airflow around the wings of subsonic plane, (2) to show factors  that influence these patterns,  and (3)  to explain their application in flight  engineering. The patterns  of velocity field contour  of  airflow  are  visualized  by  using  numerical  method  in Femlab software. Varying the velocity of airflow, the angle of attack, and the cross section form  of wings shows the visualization of these patterns.  The results of research show that the patterns  of velocity field  contour of airflow around the wings of subsonic plane may be circulation form.  Factors that influence these patterns of contour are the velocity of airflow, the attack angle of wings, and the cross section form  of wings. These three factors  determine lift coefficient and dragcoefficient.  In  commercial flight   it  is  used  airfoil  wings  that  areequipped by rear flaps on the trail edge of wings. These rear flaps canbe lowered of raised to adjust the cross section of airfoil. The slotsetting in the leading edge of wings can reduce the drag coefficient.Accordingly.fuel  efficiency andflight safety can be controlled.
Developing the student worksheet with problem-solving approach to improve critical thinking skills and the concept understanding of physics Eli Trisnowati; Yosaphat Sumardi
Momentum: Physics Education Journal Vol 3 No 1 (2019)
Publisher : Universitas PGRI Kanjuruhan Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (326.708 KB) | DOI: 10.21067/mpej.v3i1.3344

Abstract

The study aimed to investigate the quality of the developed student worksheet with a problem-solving approach in line to the determined criteria and the improvement of students’ critical thinking skills and the conceptual understanding of physics by implementing the student’s worksheet. This study was a research and development study by applying the development model by Borg & Gall. The try out subjects of validation product were students of grades X and XI of MAN (Islamic High School) Yogyakarta III. The data collection techniques used validation sheets, observation sheets, evaluation sheets of student’s worksheet, and tests. The product of this research was student’s worksheet with a problem-solving approach on the topic of optical instruments for grade X of senior high school. The evaluation of student’s worksheet by experts, teachers, peer reviewers, and students are at the best categories for learning, construct, and technical aspects. The gained standard score of students’ conceptual understanding and students’ critical thinking skills for grade X who learned through student’s worksheet with a problem-solving approach, called treatment class, were higher than students who learned without student’s worksheet with a problem-solving approach, called control class.
Co-Authors Eli Trisnowati