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  #1  
Old 01-24-2015, 02:21 PM
Ottertrack Ottertrack is offline
 
Join Date: May 2012
Location: Grand Marais
Posts: 30
Default Landing gear mount WD-721-R-PC

I wonder if anyone else has had this problem. I am building an RV-7A and am fine tuning the Landing Gear Mount. The problem is that to have all contact points of the mount up tight and flush with the web of F-704A Bulkhead, I would have to grind about 5/16 inch of material away on the aft side of the landing gear mount hole in the Forward Bottom Skin, F-772. This would encroach into the rivet hole in the F-704A flange. Any ideas on this? Thanks a lot.
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Old 01-24-2015, 03:13 PM
YellowJacket RV9 YellowJacket RV9 is offline
 
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Yep I had to; on one side I just included that rivet hole in the cutout as it was so close to it. I know I'm not the only one, either.

Chris
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  #3  
Old 01-24-2015, 03:58 PM
Ottertrack Ottertrack is offline
 
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Default Landing gear mount

Thanks Chris. I also emailed Vans with photos attached and suggested to them the only solution I could see was to grind away the rivet hole and install compensating rivets equidistant between the "disappeared" hole and the two adjacent holes on either side.
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  #4  
Old 01-26-2015, 09:48 AM
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bret bret is offline
 
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yip, just open it up to clear, I think I lost one rivit hole, pics on my site.
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  #5  
Old 01-26-2015, 03:00 PM
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bruceh bruceh is offline
 
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Yes, trim to fit, and you will take out one of the rivet holes. Here is a picture of the initial landing gear hole placement on the bottom skin.



Another shot from the inside looking up at the hole from the flipped over fuselage, you can see that you need to cut into the flange on the bulkhead.

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  #6  
Old 01-26-2015, 07:36 PM
Ottertrack Ottertrack is offline
 
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Thanks everyone, I appreciate your advice
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  #7  
Old 12-08-2018, 11:37 PM
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Draker Draker is offline
 
Join Date: Jun 2016
Location: Livermore, CA
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Bringing this very old (but helpful) thread back from the dead with a few extra questions. I'm at this point in my build too, and lo and behold, I'm going to also need to cut off at least 3/16" from my center section flange to allow the gear mount to lay flat. Trimming it to fit won't remove the second rivet hole from the end, but it will obviously bust edge distance:



I'm interested in how you guys have done this flange removal. I could file away just enough for the gear legs to fit, but would I simply leave the hole open? Rivet it anyway? I'm afraid this would be a recipe for a crack:



Might be better to remove the hole entirely:



But then what to do with the existing pre-punched hole in the bottom skin? Fill it with a rivet? I think this calls for an E-mail to Van's but I'm curious about what solutions the other 7A folks here have come up with.
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  #8  
Old 12-09-2018, 07:14 AM
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jcarne jcarne is offline
 
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I removed the hole entirely on both the spar flange and the bottom skin. Keep in mind that when you bolt the mount down there is most likely a small gap that will get closed up which will require more of that flange to be removed.
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  #9  
Old 12-09-2018, 08:28 AM
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wirejock wirejock is offline
 
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Default Rivet hole

I did the opposite. I actually marked the edge distance and managed to save the hole.
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  #10  
Old 12-10-2018, 07:38 AM
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Draker Draker is offline
 
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Thanks for the info. Larry, did you fit everything by grinding away powder coating from the gear socket? I don't see how to maintain edge distance here, given how far this thing has to go before seating against the center section.
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