Show exhaust stack stach blamed for plane disasters array army air experts believe that in tho exhaust stack they have found the firebug largely responsible for the tendency of crashed planes to burst into names flames and which ha bas cost coet many lives the much repeated naming flaming coffins designation of certain old types of army planes by col william mitchell arose from this tendency an air service report said eaid that 30 80 crash tests were conducted on obsolete airplanes it was discovered that the exhaust stack was a very serious source of fire and that if it were possible to so BO design an exhaust stack that it would be cool enough to prevent the self ignition of gasoline or oil sprayed into the stack the number of fires would be very greatly reduced preliminary designs of standard length water cooled exhaust manifolds and short air cooled manifolds bave shown that it is entirely possible to prevent fires from this source fa said i id the report |