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Check Valve For Static System Cabin Venting...

 
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Matt Dralle
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Joined: 08 Nov 2005
Posts: 25627
Location: Livermore CA USA
PostPosted: Mon Apr 19, 2010 12:51 pm    Post subject: Check Valve For Static System Cabin Venting... Reply with quote
Dear Listers,

Looking at the requirements for IFR certification of the RV-8, it looks like the only thing I don't have is an "alternate static source". This seems like it would be as simple as adding a "T" valve in the 1/4 neoprem static air tube that goes along under the left hand canopy rail.

Does anyone have any suggestions on something I could just cut the tube and stick in line with a little thumb screw to switch between the fuselage or cabin source?

I'm assuming this will meet the requirement?

Thanks!

PS - Attached are a couple of pictures from Taxi-testing and Magnetometer calibration this weekend. Cool?
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Log
Status: Final Bits/Inspection/Test Flight

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Matt Dralle
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Matt Dralle
Site Admin


Joined: 08 Nov 2005
Posts: 25627
Location: Livermore CA USA
PostPosted: Mon Apr 19, 2010 6:48 pm    Post subject: Check Valve For Static System Cabin Venting... Reply with quote
At 03:53 PM 4/19/2010 Monday, you wrote:
Quote:


Matt, cut the tubing, insert a 'T' with a short stub of tubing. Put a plug in the tube of a type that you can pull out easily if needed.
Simple, light, and inexpensive.
Linn
Matt Dralle wrote:
>Dear Listers,
>
>Looking at the requirements for IFR certification of the RV-8, it looks like the only thing I don't have is an "alternate static source". This seems like it would be as simple as adding a "T" valve in the 1/4 neoprem static air tube that goes along under the left hand canopy rail.
>
>Does anyone have any suggestions on something I could just cut the tube and stick in line with a little thumb screw to switch between the fuselage or cabin source?
>
>I'm assuming this will meet the requirement?
>
>Thanks!


What a great idea, Linn! Thanks. Here's what I did tonight including a couple of pictures...

I added a small "T" Nylon fitting in the 1/4" tube for static air just in front of the instrument panel under the left cockpit rail. I cut a short piece of 1/4" tubing and filled it with black RTV and then put a piece of heat shrink tubing over it to form a handle. The whole thing fits nicely under the cockpit rail and from the pilot's position is just barely visible, yet can be accessed easy. In the event that icing conditions occur, the fitting can be unscrewed and the plug removed for cabin venting.

Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: Final Bits/Inspection/Test Flight

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gaillard.peck.ctr(at)nell
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PostPosted: Tue Apr 20, 2010 7:54 am    Post subject: Check Valve For Static System Cabin Venting... Reply with quote
Beautiful airplane Matt. Congratulations. I look forward to news of the first flight.

Gail Peck
RV-8 Wings slow build
Las Vegas

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koppk1



Joined: 11 Sep 2008
Posts: 7
Location: Jacksonville, FL
PostPosted: Tue Apr 20, 2010 8:08 am    Post subject: Check Valve For Static System Cabin Venting... Reply with quote
Where did you get the ideal an alternate static source was required for IFR flight. No such thing as an IFR "certification" BTW...



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