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  #21  
Old 03-15-2017, 03:53 AM
Pittsartist Pittsartist is offline
 
Join Date: Aug 2013
Location: UK
Posts: 103
Default

Hi Bob,

The gussets are from drawings often referred to as the "Netherthorpe mod" here in England. It's an LAA "Repeat mod" first done on G-ODEE in 2004. It seems almost every UK aircraft I look at has had this done

They are basically home made from 1/8" 4130 Steel plate, 4 parts are added - the elongated triangles (welded top & bottom) and the roughly 2 x 2" end plates welded to the mount ends.

Cheers,

Richard
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  #22  
Old 03-15-2017, 07:48 AM
FLY6 FLY6 is offline
 
Join Date: May 2010
Location: Stoney Creek On. Ca
Posts: 64
Default Cowl

Have you put the cowl on yet? From the picture it looks as if there is an area that is going to be close to the cowl at the landing gear.
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  #23  
Old 03-15-2017, 07:51 AM
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Bob Martin Bob Martin is offline
 
Join Date: Jan 2005
Location: Richmond, Virginia
Posts: 862
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Richard,
Thanks for the reply.
1/8 is thicker than the Van's gussets.
12 years of history says something!
All good info. Best pictures I have seen posted regarding the fix.
Thanks
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RV-6 0-360 C/S 1100+TT
James cowl/plenum, induction, -8VS and Rudder.
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  #24  
Old 03-16-2017, 04:09 AM
Pittsartist Pittsartist is offline
 
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Location: UK
Posts: 103
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Quote:
Originally Posted by FLY6 View Post
Have you put the cowl on yet? From the picture it looks as if there is an area that is going to be close to the cowl at the landing gear.
Yes - all fits ok with no mods to the cowl (Phew !)
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  #25  
Old 03-20-2017, 04:30 PM
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RV6_flyer RV6_flyer is offline
 
Join Date: Jan 2005
Location: Uniontown, PA
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Quote:
Originally Posted by RV6_flyer View Post
The cracking is very common for high time RV-6s and RV-6s that operate off of grass. The fix is to install the WD-762A-L and WD-762A-R Gear Socket Gusset to engine mount that is used on the RV-7.

At 2,724 hobbs hours, I added the gussets to my mount.
Here is what the gusset looks like on my spare engine mount.








Welding done by a professional Aerospace welder.

Here is a video clip of one of the gussets.
https://youtu.be/7MBCb1X-Z2c
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KVVS RV-6
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  #26  
Old 03-21-2017, 05:03 AM
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Bob Martin Bob Martin is offline
 
Join Date: Jan 2005
Location: Richmond, Virginia
Posts: 862
Default Nice example

Gary,
Nice work, good example of the repair.
Thanks for pictures.
Of all my spare parts...I never thought to keep a "spare" engine mount!
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RV-6 0-360 C/S 1100+TT
James cowl/plenum, induction, -8VS and Rudder.
Louisa, Virginia KLKU
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  #27  
Old 03-21-2017, 06:06 AM
rvsxer rvsxer is offline
 
Join Date: May 2007
Location: Inver Grove Hgts, MN
Posts: 188
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I just found the same crack, on the right side on my RV-6 after 1450 hours. The left side cracked and was repaired a few years ago. This time the mount came off for the gusset mod, and it's over at Aerospace Welding in Eagan, MN for the full treatment. One less thing to worry about later.
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RV-6 N207AM w/G3X, 1,400 hours +
South St. Paul, MN (KSGS)
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  #28  
Old 03-21-2017, 04:30 PM
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N941WR N941WR is offline
 
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Location: SC
Posts: 10,678
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OK, you have me frightened now. My -9, mount vintage 2009, doesn't have those additional horizontal braces.

I guess I'll be taking a closer look at my lower mounts the next time the cowling comes off.

Thanks for the great write-up!
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  #29  
Old 03-21-2017, 05:30 PM
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hgerhardt hgerhardt is offline
 
Join Date: Oct 2006
Location: torrance, ca
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Quote:
Originally Posted by RV6_flyer View Post
Here is what the gusset looks like on my spare engine mount.... Welding done by a professional Aerospace welder.
Gary, after all that welding on the gear sockets, do the gear legs still slide into the holes?

Heinrich
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  #30  
Old 03-21-2017, 08:05 PM
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RV6_flyer RV6_flyer is offline
 
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Location: Uniontown, PA
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Quote:
Originally Posted by hgerhardt View Post
Gary, after all that welding on the gear sockets, do the gear legs still slide into the holes?

Heinrich
Yes. TIG welding does not appear to make as much heat or at least there was no issue.
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