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Jims RV-8
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Date: 9-1-2014
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Number of Hours: 3.70
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Manual Reference: 8-21, 22
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Brief Description: Tailcone Bulkheads – Drilling the WD-409
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I separated the Rudder stops, angles and controls stops from the F-800 angle piece by cutting at the locations shown – after consulting the drawing, then I smoothed and radiused the parts. I didn’t work the F-810C-1 & F-811C-1 angles just yet because I don’t have the longerons installed yet – but will finalize their fit when the longerons are installed.
Next I clecoed the F-812A-1, and F-812C-1 Bulkheads to each other and drilled all the 1/8” common holes. I opened the bend angle on the forward bulkhead flanges so that they both taper in to the rear/smaller end of the fuselage in parallel. The plans say do this with a hand seamer, but I found it easier to do it by hand.
For the next step, I had read that there were issues with the plans for the where to drill the keeper rivets on the WD-409 Tail spring. It took a while for me to decipher View A-A on DWG 73 but with the help of VAF and Jeff Mitchell’s build site - I managed to get a picture of what is called for. For those of you building an -8, one of the dimensions (the vertical distance between the AN4 bolts) is listed as 7/8" but this may be incorrect! The revised dimension for this according to the forum builders is 1- 23/32". Double check your plans. Anyway, the revised dimension doesn’t come into play until later – so after researching the proper dimension, I felt confident enough to measure and mark the vertical position of the top edge of the WD-409 Tail spring mount – this is the part that the tail wheel is attached too – so it’s kind of a big deal. (movie line). Once marked – it was a matter of clamping the assembly into the drill press to drill the keeper holes. With the assembly still all clamped up, I machine countersunk the rivet keeper holes as they need to be flush so that the vertical stabilizer will be able to be mounted flush to the back of this assembly.
Just clicked over 800 hours....
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clamped and drilled
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revised plans and countersunk keeper holes
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