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Scott's Aircraft Build Logs
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Date: 4-25-2010
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Number of Hours: 6.00
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Manual Reference:
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Brief Description: Center Section assembly
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Today I started assemblying the center section of the fuselage. By this stage of the game I guess Van's Aircraft figures you know what you are doing. The instructions become much more vague as in one or two sentence that "describe" a few hours wok. Of course, when you start with the tail section you get step by step instructions. Anyway, the is a document that describes the "fit and finish" of the foward bottom skin (F-772, it is under your feet,) the center section skin (F-776, it goes from under your knees to the back of the baggage compartment) and the F-704 bulkhead.
It part it says "The first situation involves the tricycle gear “A” model kits only. The construction plans state that the “outboard” 5 rivets on both the left and right side of the plane (most forward row in F-776) need to be installed “double flush”. Having the rivet’s shop heads on the inside of the plane flush with the interior surface of the F-704 allows the tricycle gear leg socket to fully nest into position. To achieve this, the builder will have to machine countersink the F-704 on the inside (top surface of the flange of the F-704 if the plane is upright) so that the rivet, when driven, will end up flush with that surface. On the exterior, the F-772 will be dimpled and the F-776 and F-704 flange will be machine countersunk to accept the F-772 dimple. Obviously the F-776 is too thin for a machine countersink and the result will be an “over countersinking” of that skin and a slight countersinking of the F-704 flange underneath. This is standard practice. Remember I said in part.
So. the first part of the day was spent finishing the countersinking of F-776 and F-704 to ensure a nice fit when the three pieces come together. After that task was finished I went to work on the assembly of the center section skeleton. First was riveting and bolting the seat ribs to the aft portion of F-704. One step of the process is applying the correct torque for the bolts. Not a problem during construction, I have an in-lb torque wrench. B
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