REPORT

2023 Summer Semester Flying Robot Project Team A Article 3June 07, 2023

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This week, we started constructing the main wing using the ribs we cut out from the 3mm thick balsa boards with the laser cutter last week. We printed and brought a real-size blueprint of the ribs of the main wing when looked at from above. Since we had to print the blueprint using A4 size paper, we stuck them together properly by cutting part of the margin and combining them.
Next, we placed the ribs in the according place and secured them using masking tape. Ensuring that the ribs stood vertically, three 4mm*4mm balsa sticks were inserted to put the ribs together. At first, we had to force the sticks into the gaps, and the rib making the end of the main wing was slightly off the ground. A teacher who saw this told us some of the balsa sticks could be crooked. When we checked this, we noticed that the balsa sticks near the leading and trailing edges of the wing were bent significantly. Furthermore, since the laser cutter cuts the material from directly above, the sides of the gaps were vertical although the balsa stick went through diagonally, and we realized that this was also a cause of the misalignment. After correcting these issues and attaching the sticks to the rib using instant glue, the wing framework was completed.
We also started constructing the tail wing. Using the laser cutter, we cut out the parts from the 3mm thick balsa boards and glued them together using instant glue. One of the parts we cut out last week was extremely weak and bendy (maybe due to the humidity?), so we will cut this part again next week and continue making the tail wing. 今週は先週厚さ3mmのバルサ板からレーザーカッターで切り出したリブを組み合わせて主翼の作成に取り掛かりました。主翼のリブを上から見たような実寸大の設計図をA4用紙で印刷し、それを貼り合わせた設計図を組み立てる際に使いました。
設計図にリブをのせてそれをマスキングテープで固定し、リブが垂直に立っていることを確かめながら4mm*4mmのバルサ角柱をリブの溝に通しました。最初に通した時はバルサ角柱を溝に押し込まないと入らず、さらに末端のリブが少し机から浮いた状態でした。それを見た先生の方から「バルサ角柱が曲がっているのでは？」ということを教えてもらい、確認したところ翼の前縁と後縁付近のバルサ角柱が大きく曲がっていることに気づきました。さらに、レーザーカッターは真上から部材を切り出すため溝の断面が垂直になってしまっており、これもずれの原因であると気がつきました。これらのことを修正して角柱を瞬間接着剤で貼り付けることで主翼の骨組みが完成しました。
尾翼の作成にも取り掛かりました。レーザーカッターを用いて厚さ３mmのバルサ板から尾翼のパーツを切り取り、瞬間接着剤を用いて貼り付けました。先週切り出したパーツのうちのいくつかがとても弱く、ふにゃふにゃになってしまっていたため（湿度の影響？）、来週またこのパーツは切り出して尾翼の作成を続けます。

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