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Greg McFarlane
Joined: 12 Apr 2012
Posts: 57
Location: Albany Western Australia
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 Posted: Sun Feb 17, 2013 4:40 am Post subject: Cabin Static Vent |
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Has anyone with an alternate static vent inside the cabin compared the pressure readings against the normal outside static vent set up in our unpressurized RV10s ? I've got a friend with an RV6 who has his AutoPilot using cabin static pressure to stop the altitude hunting caused by outside static lag. His set altitude compared to altimeter readings are so close as to make one wonder if outside static is needed at all in our Experimental Aircraft given the variations caused by different vents and leaks etc
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dave.saylor.aircrafters(a
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| Posted: Sun Feb 17, 2013 3:36 pm Post subject: Cabin Static Vent |
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My AP changes altitude a little when I open the alternate static. Maybe 50 feet? I forget if it climbs or descends. I can move it up and down a little by opening/closing the air vents.
On Sunday, February 17, 2013, Greg McFarlane wrote:
| Quote: | --> RV10-List message posted by: "Greg McFarlane" <[url=javascript:;]grbcmcfarlane(at)gmail.com[/url]>
Has anyone with an alternate static vent inside the cabin compared the pressure readings against the normal outside static vent set up in our unpressurized RV10s ? I've got a friend with an RV6 who has his AutoPilot using cabin static pressure to stop the altitude hunting caused by outside static lag. His set altitude compared to altimeter readings are so close as to make one wonder if outside static is needed at all in our Experimental Aircraft given the variations caused by different vents and leaks etc
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=394444#394444
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Dave Saylor
831-750-0284 CL
[quote][b]
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Bob Turner
Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA
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| Posted: Mon Feb 18, 2013 9:48 pm Post subject: Re: Cabin Static Vent |
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I tried it today. With alternate static my indicated airspeed jumped up about 10 knots.
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Bob Turner
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rv10flyer
Joined: 25 Aug 2009
Posts: 364
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| Posted: Wed Feb 20, 2013 7:56 am Post subject: Re: Cabin Static Vent |
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Pressure inside my cabin is was approx 100' less than outside with all heat and fresh air vents closed at cruise during initial test flights. When I opened alt static switch with AP on, it pitched down. Since then, I have sealed some openings around top of cabin at door hinges. It would also depend on whether you had heat and/or fresh air intakes open.
My TT DFII AP has some adjustments that can be made to compensate for this problem.
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