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09-13-2014, 12:44 PM
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Join Date: May 2012
Location: Grand Marais
Posts: 33
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Cracked Upper Engine Mount Bracket
It appears I might have a big problem. As I was mounting the firewall and clamping the upper engine mount brackets to the longerons, I noticed both brackets have split at the vertex. It seems odd because I noticed before I clamped them to the longerons that I had the downward bend and twist of the longerons just right so that the brackets nest perfectly. Has anyone else seen this happen? Would this affect the structural integrity of the airplane? It seems to me that once the fingers of the bracket are securely fastened to the longerons, that is where the real strength is, but I'm not sure. I'll be calling Vans on Monday but thought I would ask you all. Thanks.
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09-13-2014, 12:53 PM
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Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,218
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If you're talking about the 4 mounts that go at the inside corners to tie the longerons to the firewall, they come that way on some (all?) kits.
__________________
Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
Last edited by Kyle Boatright : 09-13-2014 at 01:01 PM.
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09-13-2014, 01:19 PM
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Join Date: May 2012
Location: Grand Marais
Posts: 33
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Bracket flanges
Yes, Kyle, I am referring to the 2 upper engine mount brackets that are attached to the upper 2 corners of the firewall. They point aft and nest on the inside of the longerons. The weld joining the 2 flanges of the bracket failed.
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09-13-2014, 01:28 PM
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Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,218
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Quote:
Originally Posted by Ottertrack
Yes, Kyle, I am referring to the 2 upper engine mount brackets that are attached to the upper 2 corners of the firewall. They point aft and nest on the inside of the longerons. The weld joining the 2 flanges of the bracket failed.
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On my -6, they were not welded. Are you sure they were welded or did the powder coat break in the seam between the two tabs that mount to the longerons?
__________________
Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
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09-13-2014, 02:04 PM
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Join Date: May 2012
Location: Grand Marais
Posts: 33
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Not welded
I had a closer look at the vertex where the 2 flanges meet and you are correct. It was just the powder coating that split. So, am I correct in that the 2 flanges will have a small space between them when they are drilled to the longeron?
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09-13-2014, 02:23 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by Ottertrack
I had a closer look at the vertex where the 2 flanges meet and you are correct. It was just the powder coating that split. So, am I correct in that the 2 flanges will have a small space between them when they are drilled to the longeron?
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Yes, it allows them to flex slightly for a tight fit against the longeron angle.
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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09-13-2014, 02:39 PM
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Join Date: May 2012
Location: Grand Marais
Posts: 33
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engine mount bracket
Thanks guys for your guidance. I really appreciate it.
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09-13-2014, 03:00 PM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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Quote:
Originally Posted by Ottertrack
I had a closer look at the vertex where the 2 flanges meet and you are correct. It was just the powder coating that split. So, am I correct in that the 2 flanges will have a small space between them when they are drilled to the longeron?
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I nearly had a heart attack when I "discovered" mine. The Vans guy kinda chuckled, but was very nice. He said it happens often. It is part of the learning process I suppose. Congratulations, build on.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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09-13-2014, 04:29 PM
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Join Date: May 2012
Location: Grand Marais
Posts: 33
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heart attack
Yes, Bill, I was really angry at myself for "breaking the weld". It's nice to have other brains to pick on occasion.
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