Cool!
That system was used by mail planes in the US back in the Golden Age.
It was also used for glider pickups by the Air Commandos in WW2.
Thanks for posting this. :ernae:
The concept goes back a long way. RPO (Railway Post Office) catcher systems date to the late 1800's and were picked up by the aviation industry but all along there have been problems. The concept is still in use today for aerial banners
http://www.advertisingairforce.com/sites/advertisingairforce/faqs/howitworks/howitworks.asp
www.faa.gov/library/manuals/aviation/media/faa-fs.pdf
The Aerocar system was designed for packages and was an integrated part of the aircraft design (unlike most others that were simply an add-on) but still had the drawbacks in spite of the "good idea"
-there is a strain on the aircraft - both at pickup and in flight. Constant use of high power settings is common.
-use requires low-altitude, slow-speed operation (always a risk)
-there are hazards to surrounding people and structures (esp. at pick-up and drop points)
-a ground crew is required which adds cost and complexity (and injury! Been there, lost the t-shirt, but that would be another thread)
Likely the epitome of such systems was the Fulton surface-to-air recovery system
http://en.wikipedia.org/wiki/Fulton_surface-to-air_recovery_system
which was designed for human "packages". Even it had 'risks' - during testing they used a pig...
"as pigs have nervous systems close to humans. Lifted off the ground, the pig began to spin as it flew through the air at 125 mph (200 km/h). It arrived on board uninjured but in a disoriented state. Once it recovered, it attacked the crew."
As far as I have found, the Aerocar was the only civilian aircraft designed for production with such a system as a factory option. As with many "good ideas" the application produced so many obstacles that it proved to be uneconomical or impractical. Nonetheless, Plymouth deserves some credit for planning and developing the concept commercially.