F-711 Bulkhead   September 30th, 2010

The F-711 Bulkhead is a double bulkhead, since it is one of the attach points of the horizontal stabilizer.

The first step is to cut out a notch as shown below.  I used a dremel tool for the rough cut, and then  a file and abrasive wheel to smooth it out to final size.

There are two aluminum bars that get riveted to the bulkhead, so you have to clamp them and match-drill them to the web of the F-711

The bottom of the bars are slimmed down (weight savings?).  While at it, I also marked the extrusion used for the tail tie-down.

Finally, here is the completed F-711.  Note the additional angle between the two bars.  Also, note that this bulkhead is near the aft end of the fuselage, and the angles of the flanges start to get sharp enough that you must bend them with the seaming pliers before you even attempt to fit it into between the side skins of the tailcone.

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F-710 Bulkhead   September 26th, 2010

The F-710 Bulkhead has a reinforcing angle across the top.  In order to clear the longerons, the angle is notched at the ends.

The idea is that the angle fits within the flanges of the F-710

And here is the entire bulkhead with angle clamped in place, ready for drilling.

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F-707 and F-708 bulkheads   September 25th, 2010

The F-707 and F-708 bulkheads are pretty simple — just join the two halves and drill the two 5/8″ for the electrical wiring.

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Drilling F-706 Bulkhead   September 19th, 2010

This is the next bulkhead on our way to the tail of the plane.  The elevator bellcrank sits between the two ribs shown here.


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Bending the F-729C Angle   September 19th, 2010

This little angle serves as support in the F-706 bulkhead assembly.  The drawings show how it has to be bent to 88.5 degrees (rather than 90 degrees).  So, how do you bend this thing by 1.5 degrees?  Well, I just clamped it to my vise and cranked a little at a time until it was about right!

I checked it against a square and measured the distance between the angle and the edge of the square.   I was looking for 19.5 mils, if you’re curious 🙂

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