TRex2 wrote:Illini Warrior wrote:new prepper wrote:I’m using a trash can. In Dr. arthur Bradley’s You Tube video on them, He makes a strong case for using foil tape to seal them. …
you have the flaw pinpointed in that design – that gap between the lid & body needs to be addressed – the copper tape …
Actually no, that isn’t quite right. It isn’t the “gap” between the lid and the can, it is the shape of the lip (listen closely to the video – if it is the one I think it is, where he uses a signal generator and a spectrum analyser). That lip creates, shall we say “turbulance” as the wave passes over it. And one of the videos also shows that aluminum furnace tape works just as well (it actually worked better in his test) as copper tape, for a much lower price.
The upper edge of the frequency spectrum of a nuclear induced high altitude EMP is just over 200MHz, so the rivit holes are not a problem either.
UPDATE: The video is no longer available, but here is an article discussing that same test, and the writer ponits out that, in addition to the shape of the lip a long narrow slit gap between the lid and the can would contribute to “leakage.”
http://www.thesurvivalistblog.net/testi … rbage-can/
how about some good old practical knowledge thru hands on usage – using a garbage can isn’t anything – goes back about as far as I can remember – I set mine up brand new in the early 80s -….
there’s a gap – use whatever stupid semantics you want – there’s no precision used in rolling that edge because there’s no reason – thus the fit between the lid & body isn’t perfect – just to satisfy YOU – it’s the f___ing “shape” …
OK smart guy – why aren’t you watching and listening to that UTube closely? – testing clearly indicates the handle area has leakage – ?????
back to using tape? – where’s your answer? – the use of tape or wrapping in tin foil or some other one usage protection is flawed ….
Statistics: Posted by Illini Warrior — Thu Jul 20, 2017 6:45 am