13brv3
Well Known Member
Greetings,
Years ago, I built an RV-8, and I recall that Van had a chart in the manual that gave the torque specs for each combination of bolt type, and nut type. When it came time to torque my wing bolts, I don't recall having any doubt about what was correct, since I had the chart to look it up on.
I just installed the wings permanently today on my current RV-8 project, and I DO mean permanently. MAN were those bolts tight Anyway, I found that Van has a different chart now, and it doesn't mention NAS bolts at all.
Next step was to go to the handy dandy AN43-13, and I can't find NAS torque specs in there either. There's a nice chart for normal bolts, but I didn't see any chart for NAS bolts.
I seem to recall that NAS bolts have higher torque ranges than normal bolts, but so far, I can't find anything to prove that. My other local RV buddy has loaned his builders manual out, but had a note that the torque for the NAS1304 bolts was 80-100 in-lbs, and the NAS1307 bolts was 520-630 in-lbs. So far, I haven't found these specs printed anywhere.
The other point that nags me is the nuts that we're using. Van calls out for AN365 nuts, which are just common tension type friction nuts. When using these with NAS bolts, would you use the torque value for a common bolt, or for an NAS bolt?
For now, I have the NAS1307's torqued to 40 ft-lbs, and the NAS1304's torqued to 70 in-lbs. These are the common bolt specs.
Do I need to go up to NAS bolt specs, and if so, what are they? I would also need to see the source of the spec for myself to be sure.
Thanks,
Rusty (DAR's paperwork on my desk)
Years ago, I built an RV-8, and I recall that Van had a chart in the manual that gave the torque specs for each combination of bolt type, and nut type. When it came time to torque my wing bolts, I don't recall having any doubt about what was correct, since I had the chart to look it up on.
I just installed the wings permanently today on my current RV-8 project, and I DO mean permanently. MAN were those bolts tight Anyway, I found that Van has a different chart now, and it doesn't mention NAS bolts at all.
Next step was to go to the handy dandy AN43-13, and I can't find NAS torque specs in there either. There's a nice chart for normal bolts, but I didn't see any chart for NAS bolts.
I seem to recall that NAS bolts have higher torque ranges than normal bolts, but so far, I can't find anything to prove that. My other local RV buddy has loaned his builders manual out, but had a note that the torque for the NAS1304 bolts was 80-100 in-lbs, and the NAS1307 bolts was 520-630 in-lbs. So far, I haven't found these specs printed anywhere.
The other point that nags me is the nuts that we're using. Van calls out for AN365 nuts, which are just common tension type friction nuts. When using these with NAS bolts, would you use the torque value for a common bolt, or for an NAS bolt?
For now, I have the NAS1307's torqued to 40 ft-lbs, and the NAS1304's torqued to 70 in-lbs. These are the common bolt specs.
Do I need to go up to NAS bolt specs, and if so, what are they? I would also need to see the source of the spec for myself to be sure.
Thanks,
Rusty (DAR's paperwork on my desk)