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Air Box Mounting Plate

 
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ferrerg(at)comcast.net
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PostPosted: Tue Sep 23, 2008 5:38 am    Post subject: Air Box Mounting Plate Reply with quote

The last two times that I did my conditional inspection I found that my air box mounting aluminum plate was cracked.

The first time I made a new mounting plate and tried to eliminate as many stress risers as I could. But it cracked again.

This time I'm having a machine shop cut the rear hole behind the carburetor air intake (needed to clear the rear part of the carburetor) with a water cutting tool.

I'm hoping that a smoother cut will prevent stress risers.

Does anyone have any suggestions that may prevent the cracking?
--
Gabe A Ferrer
RV6 N2GX
South Florida's Treasure Coast
email: ferrerg(at)comcast.net
cell: 561 758 8894
[quote][b]


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Dale Ensing



Joined: 11 Jan 2006
Posts: 571
Location: Aero Plantation Weddington NC

PostPosted: Tue Sep 23, 2008 5:46 am    Post subject: Air Box Mounting Plate Reply with quote

Do you have adequate flexibility/movement at the airbox snout/cowl inlet seal to minimize stress on the airbox plate when there is movement of the engine?
Dale Ensing
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Dale Ensing
RV-6A
Aero Plantation
Weddington NC
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pitts_pilot(at)bellsouth.
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PostPosted: Tue Sep 23, 2008 5:56 am    Post subject: Air Box Mounting Plate Reply with quote

ferrerg(at)comcast.net wrote:
Quote:
The last two times that I did my conditional inspection I found
that my air box mounting aluminum plate was cracked.

The first time I made a new mounting plate and tried to eliminate as
many stress risers as I could. But it cracked again.

This time I'm having a machine shop cut the rear hole behind
the carburetor air intake (needed to clear the rear part of
the carburetor) with a water cutting tool.

I'm hoping that a smoother cut will prevent stress risers.

Does anyone have any suggestions that may prevent the cracking?
You might try getting the prop dynamically balanced to reduce the

vibration. Water cutting will still leave small knicks that will
(could?) start to crack. A fine file followed by emery cloth to make it
smooth is good prevention.
Linn
do not archive
Quote:
--
Gabe A Ferrer
RV6 N2GX
South Florida's Treasure Coast
email: ferrerg(at)comcast.net
cell: 561 758 8894
*
*


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n223rv(at)wolflakeairport
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PostPosted: Tue Sep 23, 2008 6:19 am    Post subject: Air Box Mounting Plate Reply with quote

We made our second one out of 0.090 material....

From: ferrerg(at)comcast.net
Sent: Tuesday, September 23, 2008 9:37 AM
To: RV List <rv-list(at)matronics.com>
Subject: RV-List: Air Box Mounting Plate

The last two times that I did my conditional inspection I found that my air box mounting aluminum plate was cracked.

The first time I made a new mounting plate and tried to eliminate as many stress risers as I could. But it cracked again.

This time I'm having a machine shop cut the rear hole behind the carburetor air intake (needed to clear the rear part of the carburetor) with a water cutting tool.

I'm hoping that a smoother cut will prevent stress risers.

Does anyone have any suggestions that may prevent the cracking?
--
Gabe A Ferrer
RV6 N2GX
South Florida's Treasure Coast
email: ferrerg(at)comcast.net
cell: 561 758 8894
[quote]

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[b]


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carl.froehlich(at)cox.net
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PostPosted: Tue Sep 23, 2008 1:47 pm    Post subject: Air Box Mounting Plate Reply with quote

I had two plates crack on my 8A. I modified the cowl intake (more forward) and have a scat hose connection to the airbox. I assumed the added weight of the hose was causing the problem.

I made a plate out of .032” stainless steel – problem solved.

Carl Froehlich
RV-8A (450 hrs)
RV-10 (fuselage)

From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Michael Kraus
Sent: Tuesday, September 23, 2008 10:18 AM
To: rv-list(at)matronics.com
Subject: RE: Air Box Mounting Plate



We made our second one out of 0.090 material....

From: ferrerg(at)comcast.net
Sent: Tuesday, September 23, 2008 9:37 AM
To: RV List <rv-list(at)matronics.com>
Subject: Air Box Mounting Plate
The last two times that I did my conditional inspection I found that my air box mounting aluminum plate was cracked.



The first time I made a new mounting plate and tried to eliminate as many stress risers as I could. But it cracked again.



This time I'm having a machine shop cut the rear hole behind the carburetor air intake (needed to clear the rear part of the carburetor) with a water cutting tool.



I'm hoping that a smoother cut will prevent stress risers.



Does anyone have any suggestions that may prevent the cracking?

--
Gabe A Ferrer
RV6 N2GX
South Florida's Treasure Coast
email: ferrerg(at)comcast.net
cell: 561 758 8894
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