The tire without air is a tire that has a very extraordinary influence on the units of vehicle users, both public vehicles and tactical vehicles in the military. In addition to being used in the field of duty, this airless tire can be used for other supporting vehicles of army so there are not many obstacles during operations. Therefore, it takes good materials and proper calculations in making this airless tire tread so that in the future there are no obstacles when using it. The research methods used are experimental methods and field studies. The study was conducted repeatedly and the data was taken directly in the field. After mechanical testing of the rubber material is done to find out the physical properties of the strength of the material. Furthermore, the entire printing and assembly process is carried out and tested on the vehicle, for the conclusion of static analysis of rubber sample material that has been done has determined the proper hardness for the material connected with polyurethane, the appropriate hardness for this rubber is 80 KN/mm. The process has been tested from each sample of rubber hardness variations and the results are determined, in addition to rheometer testing or maturation process takes 5 minutes and is given a temperature of 100 °C and is assisted by hydraulic so that air from volcanic rubber is lost with the help of hydraulic pressure.
Media audio visual adalah bentuk multimedia. Multimedia merupakan salah satu media yang dapat digunakan dalam proses pembelajaran. Berdasarkan observasi yang dilakukan di SMA Negeri 4 Palembang, dilihat dari kegiatan pembelajaran pada mata pelajaran sejarah masih belum memaksimalkan multimedia, hal ini disebabkan antara lain guru dalam proses pembelajaran masih menggunakan media pembelajaran yang masih berbentuk visual, untuk dikategorikan sebagai media hal tersebut belum mencangkup materi secara keseluruhan. Media audio visual ini dipilih untuk mengatasi permasalahan tersebut, dengan pertimbangan untuk memanfaatkan fasilitas yang telah tersedia di SMA Negeri 4 Palembang. Tujuan pengembangan media ini adalah menghasilkan suatu produk media pembelajaran sejarah khususnya materi Sejarah Kolonialisme Barat di Indonesia Materi Benteng Marlborough Bengkulu dapat dijadikan alternatif dalam pencapaian tujuan pembelajaran. Penelitian ini menggunakan model perkembangan melalui sepuluh tahap berikut: (1) penelitian dan pengumpulan informasi, (2) perencanaan, (3) mengembangkan awal dari produk, (4) pengujian lapangan awal, (5) revisi awal produk, (6) uji coba pertama, (7) perbaikan dan penyempurnaan produk, (8) validasi produk, (9) revisi produk akhir, (10) menyebarluaskan produk. Hasil pengembangan media audio visual tergolong baik, meliputi penilaian dari media berada pada kriteria baik, penilaian dari isi media baik serta penilaian dari guru mata pelajaran sejarah di sekolah yang berada pada kriteria baik.
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