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lbgjb10
Joined: 28 Jan 2008
Posts: 67
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 Posted: Tue Aug 16, 2011 1:25 pm Post subject: air box alternate air |
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Taking things apart at annual. Noticed that alternate air doesn't seem to work right. Picture 2 shows it closed and under tab to keep it closed. Picture 1 shows it fully ?? open. BUT when you close it, it won't slide under tab for closing unless you have the tab loose, but then it closes, but stays open a little bit. Any suggestions?? thanks.
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Jim Berry
Joined: 10 Jan 2006
Posts: 237
Location: Denver
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| Posted: Tue Aug 16, 2011 1:58 pm Post subject: Re: air box alternate air |
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My recollection is that Van indicates in the FAB instructions that once the alternate air door is opened, it cannot be closed while in flight i.e. you must pull the cowl to get it fully closed.
Jim Berry
N15JB
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pitts_pilot(at)bellsouth.
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| Posted: Tue Aug 16, 2011 2:17 pm Post subject: air box alternate air |
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OK, let's think this through. The door is there to bypass a plugged
filter ... ice or snow ...... bird ...... or maybe to get around the
pressure drop across the filter, I dunno. Anyway, why not hinge the
door on the inside ..... make the door larger than the opening and hold
it closed with a magnet of sufficient tenacity so normal operation won't
open the door. If the filter becomes clogged the suction automatically
opens the door. No controls needed, and it automatically resets.
Now I agree that there there's some testing involved regarding the
tenacity of the magnet. Moving the magnet further from it's metal catch
... layers of paper or plastic will move the magnet away a smidgen at a
time.
An alternate method would be a weak spring ....
Any discussion???
Linn
On 8/16/2011 5:58 PM, Jim Berry wrote:
| Quote: |
My recollection is that Van indicates in the FAB instructions that once the alternate air door is opened, it cannot be closed while in flight i.e. you must pull the cowl to get it fully closed.
Jim Berry
N15JB
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=349688#349688
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rene(at)felker.com
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| Posted: Tue Aug 16, 2011 2:49 pm Post subject: air box alternate air |
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This goes way back in my memory.....but I think this was discussed when I
first started my project and I think may have even been an option then. The
problem with the magnet, etc. it is that it is not being controlled by the
pilot and it can be activated without you knowing and thus you could be
by-passing the filter all the time without even knowing........just my
opinion. Since it is one safety device that I don't ever what to have to
use, if I ever needed it and I have to remove the cowl to reset, I don't see
it as much of a problem.
Just an opinion....maybe not even a good one.
Rene' Felker
N423CF
801-721-6080
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Bob Turner
Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA
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| Posted: Tue Aug 16, 2011 4:39 pm Post subject: Re: air box alternate air |
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Vans' instructions definitely say that once pulled, you have to drop the cowl and manually reset it to fully closed.
There are some production aircraft with "automatic" alternate air, as you describe. But i suspect alternate air is needed so seldom that the re-setting is just a once in a blue moon thing.
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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| Posted: Tue Aug 16, 2011 6:26 pm Post subject: air box alternate air |
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My Mooney has automatic alternate air. A circular plate on the inside of air filter box, held closed by a spring that is secured with nut and cotter pin. Nut is tightened to provide 3-4 lbs pressure holding plate closed. It has enough area that if something like 1 psi suction develops in the air box, it opens, otherwise closes.
On Tue, Aug 16, 2011 at 5:39 PM, Bob Turner <bobturner(at)alum.rpi.edu (bobturner(at)alum.rpi.edu)> wrote:
| Quote: | --> RV10-List message posted by: "Bob Turner" <bobturner(at)alum.rpi.edu (bobturner(at)alum.rpi.edu)>
Vans' instructions definitely say that once pulled, you have to drop the cowl and manually reset it to fully closed.
There are some production aircraft with "automatic" alternate air, as you describe. But i suspect alternate air is needed so seldom that the re-setting is just a once in a blue moon thing.
--------
Bob Turner
RV-10 QB
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http://forums.matronics.com/viewtopic.php?p=349708#349708
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