Fuselage -2

August 23, 2014, 8 hours, 391 hours total
Work continued on the assembly of the Center Bulkhead, section 20 of the fuselage build. I countersunk the center section with the #30 100 degree countersink. The aft bulkhead is assembled with a combination of different type and sized rivets. Half of the rivets are flush, the other round head rivets, 426s and 470s respectively. The right aft bulkhead require flush head while the left half the round head rivets.

Assembly of the center bulkhead requires the left and skin attach flanges, two different sized skin stiffeners in addition to the aft bulkhead.

Pictured below are the left and right aft side bulkheads, and skin stiffeners, primed and ready to install.

 The aft bulhead is shown prior to assembly.

 Pictured below are the left and right skin attach flangles.

 These next two pictures show the two flanges installed on the aft bulkhead using seven each LP4-3 rivets.You can see that I primed the attachment locations only.

 Installation of the left and right bulkheads included AN470AD4-4, AN470AD4-9 and LP4-3 rivets.

 A photo of the formed head side of the rivets. Pretty consistent if I say so myself.

 In the next two photos you'll see the mix of AN426 and AN470 rivets along the upper roll of aft bulkhead attach.

 Next two photos show the left and right skin stiffeners attached with CR3213-45 draw rivets.

 Only three rivets installed in the second row of attach points. This completes assembly of the center section bulkhead.

 Section 21, Mid Fuselage Ribs and Bottom skins is next. The completed assembly looks pretty complex. Should be fun!!