I'm looking at building a jockey box with a 70" 5/16" stainless steel coil (installed in a drum-style cooler.) Seems to be a good compromise between size, weight and cost.
How quickly can I pull cold beer out of it without it foaming?
My back-of-envelope calculation says a 2133.6cm by 0.3125cm coil holds π × 0.31252 × 2133.6 = 654.5cm3 or a bit over six and a half litres of beer. The Mythbusters say you can cool a six pack of beer in five minutes with salted ice water, so I'd interpolate that one beer per minute would be achievable.
Can anyone confirm my theory with experimental evidence?