These rockets are usually Dr Pepper bottles with conical necks. Some have been shrunken from 500 ml to 400 ml using boiling water. The two tall bottles on the left are joined bottom to bottom for larger motor volume. The noses are half tennis balls, attached using hot melt glue and colored electrical tape. The fins are corrugated plastic sign board friction fitted into report cover spines.
Recovery is ballistic, the fins typically pop off without damage.
These rockets fly fast and very high. They make a very exciting whistling sound as they come home, discouraging us from trying to catch them. They do not fly as high as my fluorescent tube cover rockets fly. This rocket took off vertically at 100PSI and went into a flat stable glide. It was lost some 300 feet from the launch site on the roof of a building.