Gordon (et al):
If you want dirigibles, here are a couple of links that might be of interest. Enjoy.
73 de
Gene Smar AD3F
This one is of personal interest to me. When I worked at a local electric utility in PA (early 1980s), my research group was asked by a close-to-retirement VP to see if we could use dirigibles to transport ungodly heavy power transformers across our service territory. (Quick backgrounder - one of our generating stations had lost a main step-up transformer in a fire, so our transportation department put their emergency restoration plan into motion by scheduling a rail car to transport a spare transformer 80 miles to the location of the fire. However, Penn Central Railroad, which had placed the spare originally, had since gone bankrupt and the rails to the fire location had been torn up and scrapped. This transformer had to be re-routed over other tracks from central PA through southern Canada and back, a distance of over 3,000 miles, to replace the failed unit 80 miles away.) Our group approached Piasecki folks to discuss the feasibility of hoisting 50+ ton transformers with these things and flying across populated areas in PA, but we ultimately came to our senses and recommended against it.