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TimRVator(at)comcast.net
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 Posted: Mon Dec 05, 2016 9:31 am Post subject: Filtered Air Box options - save your life |
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The round RV air filter has become clogged by snow in at least two cases
that I know of, resulting in two fatalities (one case) and an off-field
landing (second case). RV carb heat air (at least on the RV-6) was not
hot enough to melt snow clogging the round RV air filter.
Cowl air is certainly not hot enough to melt snow from the filter.
I recommend builders learn from past history (including a fatality).
Install a filter bypass (Van's design or another design) that provides
an alternate air path to potentially save your life in case of a clogged
filter.
Tim
--
Tim Lewis -- HEF (Manassas, VA)
A&P
RV-6A N47TD -- 1104 hrs - sold
RV-10 N31TD -- 860 hrs
Kelly McMullen wrote on 12/5/2016 5:36 AM:
| Quote: | I have studied the question quite a bit. Quite frankly I think the
bypass door is a bad design and doesn't accomplish what it should.
There is no need to bypass a round filter.
Given that the air filter is an automotive round design, the physics
argue against it ever getting blocked by impact icing or any other
type like snow, frost, dust, you name it. Nothing but vapor can make
the 180 degree turn to hit the backside of the filter.
On the other hand there is some small risk that snow or ice could
block the air intake from the outside. That could be addressed by
installing the carb heat fitting at the front of the snorkel that is
designed for carbureted engines. Whether you hooked it up to heat or
not, it would provide intake air in the unlikely event that the inlet
was blocked, and would be able to be openned and closed. And you would
always have filtered air.
I did install the drain, because I didn't do the bypass door. I'm
still thinking about the carb heat door.
Kelly
-sent from the I-droid implanted in my forearm
On Sun, Dec 4, 2016 at 9:59 PM, Dan Charrois <dan(at)syz.com
<mailto:dan(at)syz.com>> wrote:
<mailto:dan(at)syz.com>>
> On 2016-Dec-04, at 5:30 PM, Carlos Trigo <trigo(at)mail.telepac.pt
<mailto:trigo(at)mail.telepac.pt>> wrote:
>
>
<trigo(at)mail.telepac.pt <mailto:trigo(at)mail.telepac.pt>>
>
> In the Van's manual, there are 2 things that are optional :
> - the FAB box drain tube, and
> - the Filter Bypass door
I put in both myself, but with the filter bypass door in place, I
can't imagine how the drain tube would ever get used. Any fuel
that ends up at the bottom of the FAB box is just going to leak
around the edges of the bypass door, since it's hardly
hermetically sealed.
Dan
---
Dan Charrois
President, Syzygy Research & Technology
Phone: 780-961-2213 <tel:780-961-2213>
====================================
br> fts!)
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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| Posted: Mon Dec 05, 2016 7:21 pm Post subject: Filtered Air Box options - save your life |
|
|
Thanks for the heads up. Personally, I have no need nor plans to fly in snow.
I suppose one could design a plate to mostly block the normal intake if the carb heat intake was activated, to prevent snow from entering the FAB.
Or you can do the Van's bypass to feed unfiltered air.
-sent from the I-droid implanted in my forearm
On Mon, Dec 5, 2016 at 10:30 AM, Tim Lewis <TimRVator(at)comcast.net (TimRVator(at)comcast.net)> wrote:
| Quote: | --> RV10-List message posted by: Tim Lewis <TimRVator(at)comcast.net (TimRVator(at)comcast.net)>
The round RV air filter has become clogged by snow in at least two cases that I know of, resulting in two fatalities (one case) and an off-field landing (second case). RV carb heat air (at least on the RV-6) was not hot enough to melt snow clogging the round RV air filter.
Cowl air is certainly not hot enough to melt snow from the filter.
I recommend builders learn from past history (including a fatality). Install a filter bypass (Van's design or another design) that provides an alternate air path to potentially save your life in case of a clogged filter.
Tim
--
Tim Lewis -- HEF (Manassas, VA)
A&P
RV-6A N47TD -- 1104 hrs - sold
RV-10 N31TD -- 860 hrs
Kelly McMullen wrote on 12/5/2016 5:36 AM:
| Quote: | I have studied the question quite a bit. Quite frankly I think the bypass door is a bad design and doesn't accomplish what it should. There is no need to bypass a round filter.
Given that the air filter is an automotive round design, the physics argue against it ever getting blocked by impact icing or any other type like snow, frost, dust, you name it. Nothing but vapor can make the 180 degree turn to hit the backside of the filter.
On the other hand there is some small risk that snow or ice could block the air intake from the outside. That could be addressed by installing the carb heat fitting at the front of the snorkel that is designed for carbureted engines. Whether you hooked it up to heat or not, it would provide intake air in the unlikely event that the inlet was blocked, and would be able to be openned and closed. And you would always have filtered air.
I did install the drain, because I didn't do the bypass door. I'm still thinking about the carb heat door.
Kelly
-sent from the I-droid implanted in my forearm
On Sun, Dec 4, 2016 at 9:59 PM, Dan Charrois <dan(at)syz.com (dan(at)syz.com) <mailto:dan(at)syz.com (dan(at)syz.com)>> wrote:
--> RV10-List message posted by: Dan Charrois <dan(at)syz.com (dan(at)syz.com)
<mailto:dan(at)syz.com (dan(at)syz.com)>>
> On 2016-Dec-04, at 5:30 PM, Carlos Trigo <trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)
<mailto:trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)>> wrote:
>
> --> RV10-List message posted by: Carlos Trigo
<trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt) <mailto:trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)>>
>
> In the Van's manual, there are 2 things that are optional :
> - the FAB box drain tube, and
> - the Filter Bypass door
I put in both myself, but with the filter bypass door in place, I
can't imagine how the drain tube would ever get used. Any fuel
that ends up at the bottom of the FAB box is just going to leak
around the edges of the bypass door, since it's hardly
hermetically sealed.
Dan
---
Dan Charrois
President, Syzygy Research & Technology
Phone: [url=tel:780-961-2213]780-961-2213[/url] <tel:[url=tel:780-961-2213]780-961-2213[/url]>
====================================
br> fts!)
r> > com" rel="noreferrer" target="_blank">www.aeroelectric.com
w.buildersbooks.com" rel="noreferrer"
target="_blank">www.buildersbooks.com
p.com" rel="noreferrer" target="_blank">www.homebuilthelp.com
e.com" rel="noreferrer" target="_blank">www.mypilotstore.com
" rel="noreferrer" target="_blank">www.mrrace.com
rel="noreferrer" target="_blank">http://www.matronics.com/contribution
-Matt Dralle, List Admin.
====================================
-List" rel="noreferrer"
target="_blank">http://www.matronics.com/Navigator?RV10-List
====================================
FORUMS -
eferrer" target="_blank">http://forums.matronics.com
====================================
WIKI -
errer" target="_blank">http://wiki.matronics.com
====================================
b Site -
-Matt Dralle, List Admin.
rel="noreferrer" target="_blank">http://www.matronics.com/contribution
====================================
|
====================================
br> fts!)
r> > /www.aeroelectric.com" rel="noreferrer" target="_blank">www.aeroelectric.com
w.buildersbooks.com" rel="noreferrer" target="_blank">www.buildersbooks.com
p.com" rel="noreferrer" target="_blank">www.homebuilthelp.com
e.com" rel="noreferrer" target="_blank">www.mypilotstore.com
" rel="noreferrer" target="_blank">www.mrrace.com
rel="noreferrer" target="_blank">http://www.matronics.com/contribution
-Matt Dralle, List Admin.
====================================
-List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List
====================================
FORUMS -
eferrer" target="_blank">http://forums.matronics.com
====================================
WIKI -
errer" target="_blank">http://wiki.matronics.com
====================================
b Site -
-Matt Dralle, List Admin.
rel="noreferrer" target="_blank">http://www.matronics.com/contribution
====================================
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD |
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