Scouts have used aluminum foil for "hobo" meals for decades. They chop up veggies, add a slab of hamburger, cover it all in foil, and cook it over hot coals. I have say that I have noticed them having more problems lately with holes in the foil. I wasn't sure if was cheap generic foil or what. Even heavy duty foil has the same problems.
Ken
The article is in reference to trying to build a vessel to boil water in. It is probably a lot different if you just want to do a potato on the coals.
I don't want to be rude but I have been surprised on many forums how many wasted or irrelevant post there are or how many derailments occur to the subject at hand (it would be courteous to create a new thread and then link to the original to prevent this) simply because some people Quick Post or skim through without all the facts and then thought they should defend their method or continue on about something that wasn't even in regard to the key points of the original topic....