eddie, the astroplane is safe at my mothers with the NOS saturn, when i open it i will measure it and clear up any confusion,
in the meantime i can tell you the hub spacing is very close to 6" but its not 3" deep, 2.5" is close,
http://i5.photobucket.com/albums/y152/ukmudduck/astroplanehub2.jpg
http://i5.photobucket.com/albums/y152/ukmudduck/astroplanehub.jpg
the down tubes are two piece, 2 x 1/2" x 48" tube minus the depth of the hub, swaged like the sigma hoop at the joint
the upper tube is 5/8" x 48" minus the depth of the hub
the user manual states a 13" spreader rod protruding past the legs 1/4" so 12" center spacing at the spreader,
the hoop is 4 pieces of 3/8" x 24" tube, 29.5" spacing at the hoop will be close,
hat is 4 x 1/8" x 24" stainless steel
the mast needs to be 1-1/4" to 1-3/4" diameter which will effect the impedance,
my mast is 1-1/2" diameter.
