Abstract: This invention presents a trough-shaped solar collector. The solar collector includes a trough-shaped reflector for concentrating incoming solar rays upon a focal axis. The reflector includes a flexible reflective film having a concave reflective surface. The reflective film is braced by a bulkhead-and-rod frame that is disposed inside the concave space created by the reflective surface of the reflective film. The reflective film is placed in longitudinal tension using spring clamps, and is intermediately held against bulkhead members using straps. The solar collector has a variety of support rod patterns to maintain the integrity of the bulkhead-and-rod frame. The solar collector may be collapsed into a smaller space for shipping or storage.