The text manual, rudder section, says “4. Bolt the rudder horn mount tube to the spar“. Since the holes in the spar are not sized for the bolts, it seems obvious they need to be drilled. However, there is a hold slightly higher up the spar and off-center that is the same size as the bolts, so I know the CNC machine can make a hole that size. Since the machine can make holes that size and did not do so for the rudder horn mount, and there is no mention of drilling these holes, I wanted to confirm that this is the process.
I assume there are probably lots of places that need drilled to size where that isn’t called out, but since I have seen it called out in a number of other places, the fact that drilling was not called out in or prior to step 4, I decided I better check since I am just getting started and don’t want to screw up at the outset. 😁
m.whititng,
You have assumed correctly. The holes are left undersized intentionally to allow for any slight deviation in the rudder where it is a welded part. You need to up size one hole to number 11, pin the rudder horn and then use the rudder horn as a drill guide to up size the second hole. Manuals will be updated soon to elaborate on this process. Thanks for bringing it to our attention. Hope this helps and happy building!
Thanks,
Ryan