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03-21-2010, 07:29 PM
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Join Date: Aug 2007
Location: Iowa
Posts: 255
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Quick Question - HS702 relief holes?
Hi All,
Quick question... do I need the bend relief holes drilled in the HS-702 (forward HS spar) on the -8? I noticed the -7 has these and the manual explicitly says to drill them, but there is no mention in the -8 manual from what I can see. I *think* there are shown in the plans, but there are no dimensions or callouts that I am seeing (doesn't mean they aren't there) on the plans.
Advice? 
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03-21-2010, 10:01 PM
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Join Date: Aug 2007
Location: Iowa
Posts: 255
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After doing some more research, it does look like I just missed this on the plans. Will do it tomorrow.  If anyone knows differently, please speak up... :P
Thanks!
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03-22-2010, 03:46 AM
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Join Date: Jan 2005
Location: Houston, TX
Posts: 868
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You're not the only one who has missed it... I did as well. I don't recall that the text instructions mention the relief holes or cuts, but after my HS was done I noticed them on a buddy's RV-7 HS. Then I took a closer look at the drawings... oops. Oh well, I'm flying now 3+ years and 650 hours without, but keeping a close eye on any cracks developing there. If they show up, looks like I build another HS, oh joy!
__________________
John Bixby
RV-8 QB sn 82030 - 1750 hrs
O-360-A1D/CS/Pmags
Houston, TX
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03-22-2010, 02:45 PM
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Join Date: Feb 2010
Location: GTA, Ontario
Posts: 826
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I missed it too...  Here is a great link to see how it's done right... http://www.rv7factory.com/log/050601.html
I just started priming the left side of the HS and have time to do this (I hope)....I hope it's not too late, even though the bend is there?? I also held off in the counter sinking until I get that perfect on a piece of scrap first.
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03-22-2010, 02:47 PM
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Join Date: Aug 2007
Location: Iowa
Posts: 255
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I haven't riveted anything together and only have all of the skeleton parts laying on the table - could easily add these if it isn't too late with the bend in. Thoughts from others?
Thanks for the replies so far. 
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03-22-2010, 02:54 PM
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Join Date: Feb 2010
Location: GTA, Ontario
Posts: 826
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The link I posted was for the -7....I'm just ooking at mine right now and there is already somewhat aof a relief in the bend already...should I go further in? It is a newer kit (Nov 09) and I'm wondering if they have encorporated it in???
I haven't riveted anything yet either. I'll post a pic in a bit to show what I have and see if there are concerns with it.
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03-22-2010, 03:35 PM
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Join Date: May 2008
Location: central oregon
Posts: 1,089
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Don and casey- if the parts are not assembled, i would certainly put the relief radius in, even if the part is already bent. without the relief radius, the stress is concentrated in the corner and the part cracks eventually. I think that might have been where Dan C.'s tail didn't pass one of his annuals- he mentioned replacing it at one point.
edit- i found a chain saw file (round) to work very well for removing aluminium, and leaving a fairly clean surface. of course you want to make sure there are no scratches and the parts are properly polished when you are done. refer to deburring and edge prep in the manual.
__________________
nothing special here...
Last edited by Danny7 : 03-22-2010 at 03:38 PM.
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03-22-2010, 05:55 PM
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Join Date: Feb 2010
Location: GTA, Ontario
Posts: 826
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Thanks Danny...
I know what I'll be doing tonight!
Last edited by Don Patrick : 03-22-2010 at 10:22 PM.
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03-22-2010, 09:35 PM
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Join Date: Feb 2010
Location: GTA, Ontario
Posts: 826
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Okay, so here is the result....I'm hoping it's sufficient. I looked at the diagrams, measured it and tried to accurately transfer it.
You will notice an "misshapen" hole 3rd over from the top left. Is this something I should be concerned about? Should I put a larger rivet in it? I can't seem to find much information about an misshapen hole?
Any advise wold be appreciated.
Thanks
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03-22-2010, 10:00 PM
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Join Date: Aug 2007
Location: Iowa
Posts: 255
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Don,
Did you make those stress-reliever holes on the HS-702 or did the part come that way? Mine definitely doesn't have those from the factory.
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