Looking at the drawings I notice a 5/8" hole in the left front HS spar between the HS-710 and the HS-714. I see no mention of it in the narratives. When do I drill this hole? I have just done all the match drilling, disassembled & deburred and ready to dimple and prime. Should I do it now?
Van's Air Force
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When to drill trim cable hole in front spar HS?
- Thread starter water4d
- Start date
Michael Brown
Active Member
manual trim?
I take it you are using the manual trim. I would say drill it the same time as the fuse. That way the holes match. Good Luck!
I take it you are using the manual trim. I would say drill it the same time as the fuse. That way the holes match. Good Luck!
Now is good.
I drilled the trim cable holes in mine during the construction of the HS before I riveted anything together. There isn't really anything to line up between the fuselage and the HS since the manual trim cable comes up through a lightening hole in the rear deck of the fuselage and goes through the front HS spar, through the HS and then exits the rear HS spar into the left elevator. There's plenty of flex in the cable and plenty of room back there to get the cable into a hole in the front spar almost any place you could possibly want to put it.
The only possible alignment issues would be between the HS and the elevator and the holes in mine (located per plans) were dead on. Even if the holes in the rear spar and the elevator were off a bit there's still some room for error so I'd go ahead and drill 'em.
I drilled the trim cable holes in mine during the construction of the HS before I riveted anything together. There isn't really anything to line up between the fuselage and the HS since the manual trim cable comes up through a lightening hole in the rear deck of the fuselage and goes through the front HS spar, through the HS and then exits the rear HS spar into the left elevator. There's plenty of flex in the cable and plenty of room back there to get the cable into a hole in the front spar almost any place you could possibly want to put it.
The only possible alignment issues would be between the HS and the elevator and the holes in mine (located per plans) were dead on. Even if the holes in the rear spar and the elevator were off a bit there's still some room for error so I'd go ahead and drill 'em.
alpinelakespilot2000
Well Known Member
There is no reason for a 5/8" hole if you are going electric trim! I believe the plans say to drill that only if you are going manual trim.
sglynn
Well Known Member
When to drill trim hole
Kevin, I am at the same place now on my RV-7A horizantal stabalizer. So did you drill the hole before riveting anything? That's what I am inclined to do. I'm not sure why folks want electric trim. Doesn't it add weight? I had electric trim on a Cherokee and it was marginal for usefulness.
Kevin, I am at the same place now on my RV-7A horizantal stabalizer. So did you drill the hole before riveting anything? That's what I am inclined to do. I'm not sure why folks want electric trim. Doesn't it add weight? I had electric trim on a Cherokee and it was marginal for usefulness.
