Saville
Well Known Member
Hi all,
I need to install the crotch strap for my Hooker Harness and I have some very newbie questions:
The belt lug is already installed in the airplane:
I've looked at the plans and found this section of Drawing 18 (RV-8) "Misc Parts":
I cannot tell if this is for the lap belt attachment, the crotch strap attachment, or if it works for both. I am assuming the latter.
My harness is a Hooker Harness and I called the company to order the crotch straps (got them). The guy I spoke with said I need an "AN4" bolt for the attachment which is a 1/4" bolt.
I read - possibly here on VAF - (yes I did a search) that you need to install a bushing over the bolt. However the attachment lug on the crotch strap already has a bushing in it which brings the hole down to 1/4". So I'm confused and have a bunch of questions:
1) On the plans, the two pieces that make up the attachment lug are bent slightly to provide a 1/16" gap. The attachment piece on the harness is 1/8"
wide....
I take it that the harness piece does NOT go in between the two leaves of the attachment lug - correct?
What is to prevent the tightening of the bolt from removing that 1/16" spacing between the two leaves?
2) If it does not go in between then does it go in front of the two leaves, in back or does it not matter?
3) The plans show that the hole for the bolt is 1/4" in diameter. But the bolt I'm supposed to use is 1/4" in diameter. Furthermore as you can see the plans call out for a 5/16 "Seat Belt Lug Spacer"
...Am I supposed to ream out the 1/4" hole in the attachment lug so that I can fit a 5/16 "Seat Belt Lug Spacer" into the attachment lug?
Or do I simply run the bolt through the spacer that's already on the harness, through the 1/4" hole in the attachment lug, and finish off with washers and a nut?
Do the plans call out for that spacer because the Van's harnesses do not come with one (as the Hookers seem to do?)
4) Once the appropriate holes/spacer confusion is cleared up, I then have to finish off the bolt with a washer(s) and nut:
One flat washer and one lock washer?
What kind of lock washer?
Some AN4's that I look at have holes in the bolt for, I imagine, a cotter pin. Should the bolt be cotterpinned with a castle nut?
Or safety wired?
Or should a nylon nut be used?
5) Lastly, certainly the bolt should be long enough for sufficient threads to be grabbed and the cotter pin hole revealed - but can the bolt be too long, in this application?
Lots of newbie questions I know and I appreciate any help.
Thanks!
I need to install the crotch strap for my Hooker Harness and I have some very newbie questions:
The belt lug is already installed in the airplane:
I've looked at the plans and found this section of Drawing 18 (RV-8) "Misc Parts":
I cannot tell if this is for the lap belt attachment, the crotch strap attachment, or if it works for both. I am assuming the latter.
My harness is a Hooker Harness and I called the company to order the crotch straps (got them). The guy I spoke with said I need an "AN4" bolt for the attachment which is a 1/4" bolt.
I read - possibly here on VAF - (yes I did a search) that you need to install a bushing over the bolt. However the attachment lug on the crotch strap already has a bushing in it which brings the hole down to 1/4". So I'm confused and have a bunch of questions:
1) On the plans, the two pieces that make up the attachment lug are bent slightly to provide a 1/16" gap. The attachment piece on the harness is 1/8"
wide....
I take it that the harness piece does NOT go in between the two leaves of the attachment lug - correct?
What is to prevent the tightening of the bolt from removing that 1/16" spacing between the two leaves?
2) If it does not go in between then does it go in front of the two leaves, in back or does it not matter?
3) The plans show that the hole for the bolt is 1/4" in diameter. But the bolt I'm supposed to use is 1/4" in diameter. Furthermore as you can see the plans call out for a 5/16 "Seat Belt Lug Spacer"
...Am I supposed to ream out the 1/4" hole in the attachment lug so that I can fit a 5/16 "Seat Belt Lug Spacer" into the attachment lug?
Or do I simply run the bolt through the spacer that's already on the harness, through the 1/4" hole in the attachment lug, and finish off with washers and a nut?
Do the plans call out for that spacer because the Van's harnesses do not come with one (as the Hookers seem to do?)
4) Once the appropriate holes/spacer confusion is cleared up, I then have to finish off the bolt with a washer(s) and nut:
One flat washer and one lock washer?
What kind of lock washer?
Some AN4's that I look at have holes in the bolt for, I imagine, a cotter pin. Should the bolt be cotterpinned with a castle nut?
Or safety wired?
Or should a nylon nut be used?
5) Lastly, certainly the bolt should be long enough for sufficient threads to be grabbed and the cotter pin hole revealed - but can the bolt be too long, in this application?
Lots of newbie questions I know and I appreciate any help.
Thanks!