RVG8tor
Well Known Member
OK, I need a little help with reading a DWG. It is DWG 3 Sec D-D, of the empennage kit. This should be common to a lot of the kits. The HS-404 and HS-405 ribs are not pre-drilled. I am not sure why other than to give builders a chance to see how it was done in the old days. In the instructions (Pg 6-2, second step under “Drilling the Horizontal Stabilizer”) it tells you to mark then drill the holes in the 405 fwd side of fwd flange according to SEC D-D (pictured below). I just want to make sure I am reading this correctly, so I will describe in words what I think the DWG is trying to communicate.
1. Looks like there will be 4 holes total in the fwd flange of HS-404
2. First hole is ¼ in from the top of the flange with a note to make sure the edge distance is maintained. I guess this means shoot for ¼ inch but make sure minimum edge distance is maintained. This would be the top hole in the flange, also top hole shown in the DWG.
3. Next hole down is ¼ inch BELOW where the HS-810 angle ends.
4. Next hole down is ¼ inch ABOVE where the HS-814 angle starts.
5. The last hole is ½ inch below the hole made in my step 4 above.
So the critical step is #1, it shows ¼ inch but you must also account for edge distance from the top edge of the flange. The other holes should follow from the first hole (top hole). My concern is the edge distance on HS-404 (nose rib in front of 405) could be an issue since the rear flange on that part is trimmed down to clear the 810/814 angles and depending on how that part lays into the gap between the 810 and 814 angles, edge distance might be an issue since the second and third hole from the top match up to the trimmed flange on the aft of the 404 nose rib. The step for drilling the 405 holes does not address the effect on the 404 nose rib flange but it seems that this needs to be accounted for, before drilling the 405 as this becomes a guide later. I know I can call Van’s about this tomorrow; I just wanted to see what others have done.
Cheers
![](/proxy.php?image=http%3A%2F%2Fimg205.imageshack.us%2Fimg205%2F2530%2Fimg1415mj2.th.jpg&hash=b5d6dd94e2b7e032b52f0e2f18e7503f)
1. Looks like there will be 4 holes total in the fwd flange of HS-404
2. First hole is ¼ in from the top of the flange with a note to make sure the edge distance is maintained. I guess this means shoot for ¼ inch but make sure minimum edge distance is maintained. This would be the top hole in the flange, also top hole shown in the DWG.
3. Next hole down is ¼ inch BELOW where the HS-810 angle ends.
4. Next hole down is ¼ inch ABOVE where the HS-814 angle starts.
5. The last hole is ½ inch below the hole made in my step 4 above.
So the critical step is #1, it shows ¼ inch but you must also account for edge distance from the top edge of the flange. The other holes should follow from the first hole (top hole). My concern is the edge distance on HS-404 (nose rib in front of 405) could be an issue since the rear flange on that part is trimmed down to clear the 810/814 angles and depending on how that part lays into the gap between the 810 and 814 angles, edge distance might be an issue since the second and third hole from the top match up to the trimmed flange on the aft of the 404 nose rib. The step for drilling the 405 holes does not address the effect on the 404 nose rib flange but it seems that this needs to be accounted for, before drilling the 405 as this becomes a guide later. I know I can call Van’s about this tomorrow; I just wanted to see what others have done.
Cheers
![](/proxy.php?image=http%3A%2F%2Fimg205.imageshack.us%2Fimg205%2F2530%2Fimg1415mj2.th.jpg&hash=b5d6dd94e2b7e032b52f0e2f18e7503f)
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