and then you learn about rolling sheet metal.......
and not filing anything, then you can build the Northrup A-4 Alpha
http://airandspace.si.edu/webimages/highres/80-2100h.jpg
Jack Northrup didn't allow filing, sanding or grinding on the sheet metal

NC11Y is the plane hanging in the Smithsonian....
this is what it looked like originally;
http://www.airminded.net/alpha/alpha2_flt.jpg
my Father gave me the original photograph......his buddy is the test pilot......this is a stolen copy......the one in Air and Space (the Smithsonian magazine has been copied so many time you can't see the back ground)
it's missing;
it's original fuel tanks that my Father built
and it's ID tag......I have a blank one....and a letter from TWA requesting it
PSST.....those wing root fillets are one piece of metal as are the empannage fillets....
trust me he didn't use an English wheel....on a 30' long piece of aluminum
