Peter van den Berg wrote:A dead end bench of that size would work, provided it is constructed as shown on the website.
Peter van den Berg wrote:
Good question! The workings of a bell relies on the difference in volume between the exhaust (and inlet) pipe and the bell. To see what the difference is, take a cross section area of the bell/bench where a column is and compare it to the csa of the exhaust. The resulting figure should be at least 5 times the pipe's csa, preferably more. In other words: the smaller the bell, the less the gases are able to slow down and stratify, separating the hotter form the colder gases. One column every 4 feet won't affect the bell's aerodynamics much, but every 1 foot does.