PVCパイプで作った汽車の笛｜笛 よくできています。笛は意外と作るのがめんどうでやったことがありません。 BellowsTrain Whistle The whistles are loud and very realistic sounding. The bellows provides the air to blow the whistles. All the parts are easy to find. The project does not require any special skills. The whistles are made from standard 3/4" I.D. PVC. The whistles are tuned to Bb, D, F, and G. The whistles are approximately 7" (Bb), 8" (D), 9" (F) and 10" (G) without the end caps and 90 degree elbows. If you would like to have more detailed instructions on how to build this train whistle, go to Amazon. com, kindle book section, and search for "BELLOWS TRAIN WHISTLE". The construction manual contains over 70 photos and diagrams along with step by step detailed instructions. The bellows cloth is imitation leather (Naugahyde) found at most fabric stores.