[ Question ] Ballast Weldment Hole spacing - Printable Version +- Rotorway Forums (https://rotorwayforums.com) +-- Forum: Rotorway General (https://rotorwayforums.com/forum-1.html) +--- Forum: Maintenance & Troubleshooting (162/A600) (https://rotorwayforums.com/forum-2.html) +--- Thread: [ Question ] Ballast Weldment Hole spacing (/thread-81.html)

Ballast Weldment Hole spacing - Sam Oliver - 02-12-2026 Any particular engineering reason the hole spacing for the ballast weight mount to the weldment in the tailboom have different edge clearances? I'm building an A600 from parts gathered hither and yonder.   Most Brand new parts, some previously installed but none ever completed.  This is the case with this mount.   It was previously drilled and the hole placement by the previous person was 5/16 on both edges.   The drawing show a different edge clearance on the forward hole?     I'm thinking a 16th of an inch in this application is not critical as it still falls within normal edge clearance limits. RE: Ballast Weldment Hole spacing - Lyle Swallows - 02-12-2026 my "best guess" would be looking at the support gusset on the bottom leaves very little room on the nut side of the fastener so they had to give it such little edge distance. 9/16" would be the more appropriate edge distance. and whoever drill yours initially just mirrored both sides. i dont think this would be an issue looking at the materials and the load doesnt have a great enough leverage in my opinion. i am not an engineer however, just a mechanic. RE: Ballast Weldment Hole spacing - Sam Oliver - 02-13-2026 Yes, My guess is the original builder just "missed" that difference when they were laying out holes.   And as I reminisce on my basic introduction to physics as I struggled through my basic education many moons ago, I would think the force working on that particular  forward portion of the mount would be predominantly much less than the force on the rear mount.  More appropriate is good.  But appropriate enough is the final  straw.  Using the Good, better, best analogy, and thumbing through my AC 43 library, I have concluded that it is not a safety issue and will use that ballast mount tube as previously drilled on my project.   As always, thanks for the input. Sam