@inproceedings{oai:jaxa.repo.nii.ac.jp:00005654,
 author = {丸山, 純 and 横山, 佳之 and 宮嵜, 武 and 姫野, 龍太郎 and Maruyama, Jun and Yokoyama, Yoshiyuki and Miyazaki, Takeshi and Himeno, Ryutaro},
 book = {宇宙航空研究開発機構特別資料: 境界層遷移の解明と制御研究会講演論文集　第39回, JAXA Special Publication: Proceedings of the 39th JAXA Workshops on Investigation and Control of Boundary-Layer Transition},
 month = {Dec},
 note = {Using a high-speed video camera, we have recorded the trajectory and the rotation of a hard baseball and a sphere thrown by pitching machines. We measured the drag and lift coefficients by analyzing the video images. We altered pitching machines on the market in order to throw a 'gyro-ball', whose rotational axis lies almost in the translational direction. The drag coefficient of a gyro-ball decreases with the Reynolds numbers (Re). For a fast-ball, the drag coefficient doesn't depend on Re and the lift coefficient is increases with the Re and the Spin Parameter (SP). The drag coefficient of a sphere is larger than that of a baseball for fast- and gyro-pitches, indicating that seams on the ball surface have substantial influence on the flow field., 資料番号: AA0063608009, レポート番号: JAXA-SP-07-009},
 pages = {27--30},
 publisher = {宇宙航空研究開発機構, Japan Aerospace Exploration Agency (JAXA)},
 title = {硬式野球ボールに働く流体力の測定},
 volume = {JAXA-SP-07-009},
 year = {2007}
}