Today's Message Index:
----------------------
1. 04:21 AM - Re: Fab Bypass Filter (Dale Ensing)
2. 04:51 AM - Re: Fab Bypass Filter (Tim Bryan)
3. 05:22 AM - Re: Fab Bypass Filter (Dale Ensing)
4. 05:50 AM - Re: Fab Bypass Filter (rv6n@optonline.net)
5. 05:55 AM - Re: Aero-net Reuse... (wskimike)
6. 05:58 AM - Re: Fab Bypass Filter (Mike Robertson)
7. 08:02 AM - Re: Fab Bypass Filter (Reak, Brad)
8. 08:33 AM - Re: Fab Bypass Filter (Terry Watson)
9. 08:35 AM - Re: Aero-net Reuse... (Matt Dralle)
10. 09:21 AM - Re: Fab Bypass Filter (mr.gsun@gmail.com)
11. 11:06 AM - Re: Fab Bypass Filter (Dale Ensing)
12. 06:20 PM - Re: Fab Bypass Filter (mr.gsun@gmail.com)
13. 07:21 PM - Re: Fab Bypass Filter (Tim Lewis)
14. 07:42 PM - Re: Fab Bypass Filter (Emrath)
15. 08:03 PM - Re: Fab Bypass Filter (Ron Lee)
Message 1
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| Subject: | Re: Fab Bypass Filter |
The by-pass door, with magnet, on my O-360 was opening frequently. I suspect
on high MAP settings. It has been fixed closed. I have the cable control for
the door but have chosen not to put in on. I think this was another CYA
issue brought on after Van's became an employee owned business.
----- Original Message -----
From: "Emrath" <emrath@comcast.net>
Sent: Wednesday, May 28, 2008 10:08 PM
Subject: RV-List: Fab Bypass Filter
>
> Starting around late 2003, or so I think, Van's put out a modification for
> bypassing the filter in the FAB should the filter get clogged. This is for
> the vertical induction carb or FI-servo installations. The original
> method
> utilized a magnet and then a revised version utilized a cable operated by
> the pilot. At the time, when I first fabricated the FAB, I modified it
> according to the original method using the magnet. Today, as I finish up
> my
> panel and get prepared to put the forward top skin on, I began thinking
> about this once more. So, I'm wondering if anyone still has the magnet
> version of this modification on their ship and can tell me if the bypass
> magnet releases and lets air bypass the filter under NORMAL operating
> conditions or not. I'm driving myself crazy trying to determine what the
> NORMAL psi differential might be on this door to compare the calculated
> force needed to open the door and the amount the door will see during
> NORMAL
> operations. Anyone/everyone have some thoughts on this?
>
> Marty in Brentwood, RV6A
>
>
>
Message 2
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| Subject: | Fab Bypass Filter |
Wow, I didn't realize the door was opening under normal conditions. How did
you determine this? I fly off a grass runway and the thought of all that
crap getting in my engine is a bit frightening. Also how did you (what
method) close it off permanent?
Tim Bryan
RV-6 Flying
N616TB almost 100 hours now
> -----Original Message-----
> From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-
> server@matronics.com] On Behalf Of Dale Ensing
> Sent: Thursday, May 29, 2008 6:16 AM
> To: rv-list@matronics.com
> Subject: Re: RV-List: Fab Bypass Filter
>
>
> The by-pass door, with magnet, on my O-360 was opening frequently. I
> suspect
> on high MAP settings. It has been fixed closed. I have the cable control
> for
> the door but have chosen not to put in on. I think this was another CYA
> issue brought on after Van's became an employee owned business.
>
> ----- Original Message -----
> From: "Emrath" <emrath@comcast.net>
> To: <rv-list@matronics.com>
> Sent: Wednesday, May 28, 2008 10:08 PM
> Subject: RV-List: Fab Bypass Filter
>
>
> >
> > Starting around late 2003, or so I think, Van's put out a modification
> for
> > bypassing the filter in the FAB should the filter get clogged. This is
> for
> > the vertical induction carb or FI-servo installations. The original
> > method
> > utilized a magnet and then a revised version utilized a cable operated
> by
> > the pilot. At the time, when I first fabricated the FAB, I modified it
> > according to the original method using the magnet. Today, as I finish
> up
> > my
> > panel and get prepared to put the forward top skin on, I began thinking
> > about this once more. So, I'm wondering if anyone still has the magnet
> > version of this modification on their ship and can tell me if the bypass
> > magnet releases and lets air bypass the filter under NORMAL operating
> > conditions or not. I'm driving myself crazy trying to determine what
> the
> > NORMAL psi differential might be on this door to compare the calculated
> > force needed to open the door and the amount the door will see during
> > NORMAL
> > operations. Anyone/everyone have some thoughts on this?
> >
> > Marty in Brentwood, RV6A
> >
> >
> >
> >
> >
> >
> >
>
>
>
Message 3
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| Subject: | Re: Fab Bypass Filter |
The area where the door made contact with the airbox showed signs of
opening/closing. I semi-permanently closed it by bonding the door to the
airbox with fluorosilicone sealant which is resistant to gasoline. You could
do the same thing with a bit of Proseal from Van's.
I attributed my situation to the O-360 with spark advance from LASAR
ignition which puts out a lot of power on take off. Other engine set-ups may
not have the problem. However, if I remember correctly, Van's went to the
cable control set-up because they also discovered the magnet was not strong
enough to hold the door closed.
RV-6A N118DE
Dale Ensing
----- Original Message -----
From: "Tim Bryan" <n616tb@btsapps.com>
Sent: Thursday, May 29, 2008 7:36 AM
Subject: RE: RV-List: Fab Bypass Filter
>
> Wow, I didn't realize the door was opening under normal conditions. How
> did
> you determine this? I fly off a grass runway and the thought of all that
> crap getting in my engine is a bit frightening. Also how did you (what
> method) close it off permanent?
>
> Tim Bryan
> RV-6 Flying
> N616TB almost 100 hours now
>
>> -----Original Message-----
>> From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-
>> server@matronics.com] On Behalf Of Dale Ensing
>> Sent: Thursday, May 29, 2008 6:16 AM
>> To: rv-list@matronics.com
>> Subject: Re: RV-List: Fab Bypass Filter
>>
>>
>> The by-pass door, with magnet, on my O-360 was opening frequently. I
>> suspect
>> on high MAP settings. It has been fixed closed. I have the cable control
>> for
>> the door but have chosen not to put in on. I think this was another CYA
>> issue brought on after Van's became an employee owned business.
>>
>> ----- Original Message -----
>> From: "Emrath" <emrath@comcast.net>
>> To: <rv-list@matronics.com>
>> Sent: Wednesday, May 28, 2008 10:08 PM
>> Subject: RV-List: Fab Bypass Filter
>>
>>
>> >
>> > Starting around late 2003, or so I think, Van's put out a modification
>> for
>> > bypassing the filter in the FAB should the filter get clogged. This is
>> for
>> > the vertical induction carb or FI-servo installations. The original
>> > method
>> > utilized a magnet and then a revised version utilized a cable operated
>> by
>> > the pilot. At the time, when I first fabricated the FAB, I modified it
>> > according to the original method using the magnet. Today, as I finish
>> up
>> > my
>> > panel and get prepared to put the forward top skin on, I began thinking
>> > about this once more. So, I'm wondering if anyone still has the
>> > magnet
>> > version of this modification on their ship and can tell me if the
>> > bypass
>> > magnet releases and lets air bypass the filter under NORMAL operating
>> > conditions or not. I'm driving myself crazy trying to determine what
>> the
>> > NORMAL psi differential might be on this door to compare the calculated
>> > force needed to open the door and the amount the door will see during
>> > NORMAL
>> > operations. Anyone/everyone have some thoughts on this?
>> >
>> > Marty in Brentwood, RV6A
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>>
>>
>>
>
>
>
Message 4
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| Subject: | Re: Fab Bypass Filter |
I recently finished my condition inspection and discovered the magnet missing.
Obviously it vibrated off. I too have received the new cable mod but refuse
to put it on because it's design worries me. The thought of a rivet getting sucked
into the induction system is scary. So I removed the remaining parts of
the original system and fiber-glassed the opening closed because I would do a
180 and stay clear of weather that would call for the need of a bypass in the
first place. Before I sign off on the inspection a simple note will be made
in my POH explaining why my plane should not be flown in conditions that will
cause the FAB to be blocked..
Do not archive
----- Original Message -----
From: Emrath
Subject: RV-List: Fab Bypass Filter
>
> Starting around late 2003, or so I think, Van's put out a
> modification for
> bypassing the filter in the FAB should the filter get clogged.
> This is for
> the vertical induction carb or FI-servo installations. The
> original method
> utilized a magnet and then a revised version utilized a cable
> operated by
> the pilot. At the time, when I first fabricated the FAB, I
> modified it
> according to the original method using the magnet. Today, as I
> finish up my
> panel and get prepared to put the forward top skin on, I began
> thinkingabout this once more. So, I'm wondering if anyone
> still has the magnet
> version of this modification on their ship and can tell me if
> the bypass
> magnet releases and lets air bypass the filter under NORMAL operating
> conditions or not. I'm driving myself crazy trying to determine
> what the
> NORMAL psi differential might be on this door to compare the
> calculatedforce needed to open the door and the amount the door
> will see during NORMAL
> operations. Anyone/everyone have some thoughts on this?
>
> Marty in Brentwood, RV6A
>
>
>
>
>
>
>
>
Message 5
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| Subject: | Re: Aero-net Reuse... |
The Navy hardware manual doesn't allow reuse of these nuts on any critical
system like flight controls. Otherwise check the run-on torque for that
specific nut. I think the Navy goes overboard on this issue because if the
nut was installed properly and not overtorqued, the run on torque usually is
good for two or three times. I personally would replace it on critical
systems after one re-use.
Mike
----- Original Message -----
From: "Richard Seiders" <seiders@bellsouth.net>
Sent: Wednesday, May 28, 2008 6:15 PM
Subject: Re: RV-List: Aero-net Reuse...
>
> Ditto, Sam.
> Dick
>
>
> At 01:39 PM 5/28/2008, you wrote:
>>
>>Matt Dralle wrote:
>>>
>>>Hello Listers,
>>>What is the common opinion on the reuse of those aero-nuts with the
>>>little nylon insert? Seems like once you use one and take it off the
>>>strength of the nylon isn't as good any longer. Is there a "recommended"
>>>number of uses for them?
>>>Thanks,
>>>Matt
>>
>>
>>Matt, the rule-of-thumb I've always heard is as long as the nut still has
>>enough resistance that you can't thread it on the bolt by hand it is still
>>serviceable.
>>
>>Sam Buchanan
>>
>>
>>
>>
>>
>>
>>--
>>Release Date: 5/28/2008 7:20 AM
>
>
>
Message 6
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| Subject: | Fab Bypass Filter |
We found signs of the door openeing during high power setting on our IO-320
. Once I prosealed the door closed there was a very noticable increase in
manifold pressure during take-offs and the engine ran much better. We deci
ded to leave the door closed and replaced it recently with a new FAB withou
t a door cutout. Much better!!
Mike Robertson
Das Fed> From: densing@carolina.rr.com> To: rv-list@matronics.com> Subject:
Re: RV-List: Fab Bypass Filter> Date: Thu, 29 May 2008 08:18:47 -0400> > -
e area where the door made contact with the airbox showed signs of > openin
g/closing. I semi-permanently closed it by bonding the door to the > airbox
with fluorosilicone sealant which is resistant to gasoline. You could > do
the same thing with a bit of Proseal from Van's.> I attributed my situatio
n to the O-360 with spark advance from LASAR > ignition which puts out a lo
t of power on take off. Other engine set-ups may > not have the problem. Ho
wever, if I remember correctly, Van's went to the > cable control set-up be
cause they also discovered the magnet was not strong > enough to hold the d
oor closed.> RV-6A N118DE> Dale Ensing> > ----- Original Message ----- > Fr
om: "Tim Bryan" <n616tb@btsapps.com>> To: <rv-list@matronics.com>> Sent: Th
ursday, May 29, 2008 7:36 AM> Subject: RE: RV-List: Fab Bypass Filter> > >
, I didn't realize the door was opening under normal conditions. How > > di
d> > you determine this? I fly off a grass runway and the thought of all th
at> > crap getting in my engine is a bit frightening. Also how did you (wha
t> > method) close it off permanent?> >> > Tim Bryan> > RV-6 Flying> > N616
TB almost 100 hours now> >> >> -----Original Message-----> >> From: owner-r
v-list-server@matronics.com [mailto:owner-rv-list-> >> server@matronics.com
] On Behalf Of Dale Ensing> >> Sent: Thursday, May 29, 2008 6:16 AM> >> To:
rv-list@matronics.com> >> Subject: Re: RV-List: Fab Bypass Filter> >>> >>
>> The by-pass door, with magnet, on my O-360 was opening frequently. I> >
> suspect> >> on high MAP settings. It has been fixed closed. I have the ca
ble control> >> for> >> the door but have chosen not to put in on. I think
this was another CYA> >> issue brought on after Van's became an employee ow
ned business.> >>> >> ----- Original Message -----> >> From: "Emrath" <emra
th@comcast.net>> >> To: <rv-list@matronics.com>> >> Sent: Wednesday, May 28
, 2008 10:08 PM> >> Subject: RV-List: Fab Bypass Filter> >>> >>> >> > --> R
V-List message posted by: "Emrath" <emrath@comcast.net>> >> >> >> > Startin
g around late 2003, or so I think, Van's put out a modification> >> for> >>
> bypassing the filter in the FAB should the filter get clogged. This is>
>> for> >> > the vertical induction carb or FI-servo installations. The ori
ginal> >> > method> >> > utilized a magnet and then a revised version utili
zed a cable operated> >> by> >> > the pilot. At the time, when I first fabr
icated the FAB, I modified it> >> > according to the original method using
the magnet. Today, as I finish> >> up> >> > my> >> > panel and get prepared
to put the forward top skin on, I began thinking> >> > about this once mor
e. So, I'm wondering if anyone still has the > >> > magnet> >> > version of
this modification on their ship and can tell me if the > >> > bypass> >> >
magnet releases and lets air bypass the filter under NORMAL operating> >>
> conditions or not. I'm driving myself crazy trying to determine what> >>
the> >> > NORMAL psi differential might be on this door to compare the calc
ulated> >> > force needed to open the door and the amount the door will see
during> >> > NORMAL> >> > operations. Anyone/everyone have some thoughts o
n this?> >> >> >> > Marty in Brentwood, RV6A> >> >> >> >> >> >> >> >> >> >>
===============> > >
_________________________________________________________________
E-mail for the greater good. Join the i=92m Initiative from Microsoft.
ood
Message 7
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| Subject: | Re: Fab Bypass Filter |
When I built my air box (RV7A) I followed the directions and built the
alternate air door with the magnet. After flying the first 20 hours and
reading that Van's had redesigned the alternate air door, I decided that
for my type of flying, the benefit of an alternate air door was
non-existent but the cost of having the door open when it should closed
could be high ($$$). So I sealed the door shut and am not loosing any
sleep over the decision.
Brad Reak - RV7A, 70 hours.
Message 8
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| Subject: | Fab Bypass Filter |
I removed the door and magnetic latch and installed one of Van's oil cooler
shutters instead. It looks like it will work fine, when it flies.
Terry
RV-8A
Seattle
From: owner-rv-list-server@matronics.com
[mailto:owner-rv-list-server@matronics.com] On Behalf Of Reak, Brad
Sent: Thursday, May 29, 2008 7:56 AM
Subject: Re: RV-List: Fab Bypass Filter
When I built my air box (RV7A) I followed the directions and built the
alternate air door with the magnet. After flying the first 20 hours and
reading that Van's had redesigned the alternate air door, I decided that for
my type of flying, the benefit of an alternate air door was non-existent but
the cost of having the door open when it should closed could be high ($$$).
So I sealed the door shut and am not loosing any sleep over the decision.
Brad Reak - RV7A, 70 hours.
Message 9
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| Subject: | Aero-net Reuse... |
At 05:24 PM 5/28/2008 Wednesday, you wrote:
>Doing it and making it right are two entirely different questions.
>Paragraph 7-64 f. addresses nylon nuts.
>>>
>>> What is the common opinion on the reuse of those aero-nuts with the
>>> little nylon insert? Seems like once you use one and take it off the
>
Thank for all the great feedback, everyone!
Matt
Message 10
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| Subject: | Re: Fab Bypass Filter |
I've got a -7 with the forward facing injection and no bypass installed.
I've been considering installing one. My thought had been to put in a cable
operated air door with some scat tubing feeding it from a NACA vent under
the front of the cowl. My thought was that it wouldn't clog or ice up when
the air filter does even though it would be cold air. The other use for it
would be to increase my MP when I open it during cruise.
Any thoughts on this one?
Greg
do not archive
On Wed, May 28, 2008 at 7:08 PM, Emrath <emrath@comcast.net> wrote:
>
> Starting around late 2003, or so I think, Van's put out a modification for
> bypassing the filter in the FAB should the filter get clogged. This is for
> the vertical induction carb or FI-servo installations. The original method
> utilized a magnet and then a revised version utilized a cable operated by
> the pilot. At the time, when I first fabricated the FAB, I modified it
> according to the original method using the magnet. Today, as I finish up
> my
> panel and get prepared to put the forward top skin on, I began thinking
> about this once more. So, I'm wondering if anyone still has the magnet
> version of this modification on their ship and can tell me if the bypass
> magnet releases and lets air bypass the filter under NORMAL operating
> conditions or not. I'm driving myself crazy trying to determine what the
> NORMAL psi differential might be on this door to compare the calculated
> force needed to open the door and the amount the door will see during
> NORMAL
> operations. Anyone/everyone have some thoughts on this?
>
> Marty in Brentwood, RV6A
>
>
Message 11
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| Subject: | Re: Fab Bypass Filter |
Greg,
Connecting the bypass door via SCAT tubing hooked up to a NACA vent
would give you fresh, unheated, unfiltered air but why open the bypass
door in normal cruise? Van's ram air scoop supposedly gives a minimal
amount of MAP increase. Don't think the NACA vent would give any ram air
pressure. And would the NACA vent also be prone to freezing up to some
degree in a cold rain just as the filter in the airbox? Maybe not but
worh thinking about.
Dale
----- Original Message -----
From: mr.gsun@gmail.com
To: rv-list@matronics.com
Sent: Thursday, May 29, 2008 12:17 PM
Subject: Re: RV-List: Fab Bypass Filter
I've got a -7 with the forward facing injection and no bypass
installed. I've been considering installing one. My thought had been
to put in a cable operated air door with some scat tubing feeding it
from a NACA vent under the front of the cowl. My thought was that it
wouldn't clog or ice up when the air filter does even though it would be
cold air. The other use for it would be to increase my MP when I open
it during cruise.
Any thoughts on this one?
Greg
do not archive
On Wed, May 28, 2008 at 7:08 PM, Emrath <emrath@comcast.net> wrote:
Starting around late 2003, or so I think, Van's put out a
modification for
bypassing the filter in the FAB should the filter get clogged. This
is for
the vertical induction carb or FI-servo installations. The original
method
utilized a magnet and then a revised version utilized a cable
operated by
the pilot. At the time, when I first fabricated the FAB, I modified
it
according to the original method using the magnet. Today, as I
finish up my
panel and get prepared to put the forward top skin on, I began
thinking
about this once more. So, I'm wondering if anyone still has the
magnet
version of this modification on their ship and can tell me if the
bypass
magnet releases and lets air bypass the filter under NORMAL
operating
conditions or not. I'm driving myself crazy trying to determine
what the
NORMAL psi differential might be on this door to compare the
calculated
force needed to open the door and the amount the door will see
during NORMAL
operations. Anyone/everyone have some thoughts on this?
Marty in Brentwood, RV6A
Message 12
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| Subject: | Re: Fab Bypass Filter |
My thought is that the air filter robs some pressure and by providing fresh
air from a scoop or NACA vent might make up for some of this loss. I've
thought about the vent being prone to freezing or ice but since it is on the
bottom of the cowl and "facing" downward it would accumulate ice slower than
the air filter which sits just inside the engine air inlet facing upwards
just waiting for ice to cover it up. This whole idea wouldn't be the best
for preventing ice from suffocating the engine compared to warm air from
inside the cowl but I think there might be some benefit from the ram air.
Maybe I need a larger NACA vent & tubing. I don't want Van's lower snout,
though. Just don't like the looks of it.
Greg
On Thu, May 29, 2008 at 11:03 AM, Dale Ensing <densing@carolina.rr.com>
wrote:
> Greg,
> Connecting the bypass door via SCAT tubing hooked up to a NACA vent would
> give you fresh, unheated, unfiltered air but why open the bypass door in
> normal cruise? Van's ram air scoop supposedly gives a minimal amount of MAP
> increase. Don't think the NACA vent would give any ram air pressure. And
> would the NACA vent also be prone to freezing up to some degree in a cold
> rain just as the filter in the airbox? Maybe not but worh thinking about.
> Dale
>
> ----- Original Message -----
> *From:* mr.gsun@gmail.com
> *To:* rv-list@matronics.com
> *Sent:* Thursday, May 29, 2008 12:17 PM
> *Subject:* Re: RV-List: Fab Bypass Filter
>
> I've got a -7 with the forward facing injection and no bypass installed.
> I've been considering installing one. My thought had been to put in a cable
> operated air door with some scat tubing feeding it from a NACA vent under
> the front of the cowl. My thought was that it wouldn't clog or ice up when
> the air filter does even though it would be cold air. The other use for it
> would be to increase my MP when I open it during cruise.
>
> Any thoughts on this one?
>
> Greg
>
> do not archive
>
> On Wed, May 28, 2008 at 7:08 PM, Emrath <emrath@comcast.net> wrote:
>
>>
>> Starting around late 2003, or so I think, Van's put out a modification for
>> bypassing the filter in the FAB should the filter get clogged. This is for
>> the vertical induction carb or FI-servo installations. The original
>> method
>> utilized a magnet and then a revised version utilized a cable operated by
>> the pilot. At the time, when I first fabricated the FAB, I modified it
>> according to the original method using the magnet. Today, as I finish up
>> my
>> panel and get prepared to put the forward top skin on, I began thinking
>> about this once more. So, I'm wondering if anyone still has the magnet
>> version of this modification on their ship and can tell me if the bypass
>> magnet releases and lets air bypass the filter under NORMAL operating
>> conditions or not. I'm driving myself crazy trying to determine what the
>> NORMAL psi differential might be on this door to compare the calculated
>> force needed to open the door and the amount the door will see during
>> NORMAL
>> operations. Anyone/everyone have some thoughts on this?
>>
>> Marty in Brentwood, RV6A
>>
>>
>>
>>
>>
>>
>>
>>
> *
>
> href="http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/Navigator?RV-List
> href="http://forums.matronics.com">http://forums.matronics.com
> href="http://www.matronics.com/contribution">http://www.matronics.com/c*
>
> *
>
> *
>
>
Message 13
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|
| Subject: | Re: Fab Bypass Filter |
There's been one RV-6 fatal accident (that I personally know of) traced
to a snow-clogged air filter. Pilot and passenger killed.
I was lucky to survive the same thing in my RV-6A several years ago.
Van's bypass came out shortly thereafter.
Observations:
- Snow at night or while IMC may not be visible or recognized.
- The air filter can be blocked even when there is absolutely no visible
moisture accumulation on the airframe exterior.
- "I'll remember to use carb heat as a preventative" can be
overlooked/forgotten.
- Once blockage has occurred, the carb heat in an RV (using the carb
heat muff) will not melt the snow sufficient to restore required air
flow into the engine.
Omit a filter bypass at your peril.
Tim
P.S.
Other observations:
- There exists a breed of FAA "investigator" who will manufacture
fantastic stories if the facts don't support his pet views.
- A closed mouth and the AOPA legal services plan can be effective tools
against this sort of FAA fiction writer.
--
Tim Lewis -- HEF (Manassas, VA)
RV-6A N47TD -- 1000 hrs
RV-10 #40059 under construction
>
>
> The by-pass door, with magnet, on my O-360 was opening frequently. I
> suspect on high MAP settings. It has been fixed closed. I have the
> cable control for the door but have chosen not to put in on. I think
> this was another CYA issue brought on after Van's became an employee
> owned business.
>
> ----- Original Message ----- From: "Emrath" <emrath@comcast.net>
> To: <rv-list@matronics.com>
> Sent: Wednesday, May 28, 2008 10:08 PM
> Subject: RV-List: Fab Bypass Filter
>
>
>>
>> Starting around late 2003, or so I think, Van's put out a
>> modification for
>> bypassing the filter in the FAB should the filter get clogged. This
>> is for
>> the vertical induction carb or FI-servo installations. The original
>> method
>> utilized a magnet and then a revised version utilized a cable
>> operated by
>> the pilot. At the time, when I first fabricated the FAB, I modified it
>> according to the original method using the magnet. Today, as I
>> finish up my
>> panel and get prepared to put the forward top skin on, I began thinking
>> about this once more. So, I'm wondering if anyone still has the magnet
>> version of this modification on their ship and can tell me if the bypass
>> magnet releases and lets air bypass the filter under NORMAL operating
>> conditions or not. I'm driving myself crazy trying to determine what
>> the
>> NORMAL psi differential might be on this door to compare the calculated
>> force needed to open the door and the amount the door will see during
>> NORMAL
>> operations. Anyone/everyone have some thoughts on this?
>>
>> Marty in Brentwood, RV6A
>>
>>
>>
>>
>>
>>
>>
>
>
Message 14
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| Subject: | Re: Fab Bypass Filter |
Well, seems the consensus is to just not use a bypass for the filter based
on the responses. Thanks to everyone.
Marty in Brentwood, RV6A
Starting around late 2003, or so I think, Van's put out a modification
for
bypassing the filter in the FAB should the filter get clogged. This is
for
the vertical induction carb or FI-servo installations. The original
method
utilized a magnet and then a revised version utilized a cable operated
by
the pilot. At the time, when I first fabricated the FAB, I modified
it
according to the original method using the magnet. Today, as I finish
up my
panel and get prepared to put the forward top skin on, I began
thinking
about this once more. So, I'm wondering if anyone still has the
magnet
version of this modification on their ship and can tell me if the
bypass
magnet releases and lets air bypass the filter under NORMAL operating
conditions or not. I'm driving myself crazy trying to determine what
the
NORMAL psi differential might be on this door to compare the
calculated
force needed to open the door and the amount the door will see during
NORMAL
operations. Anyone/everyone have some thoughts on this?
Marty in Brentwood, RV6A
Message 15
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| Subject: | Re: Fab Bypass Filter |
Don't fly in snow/cold clouds.
Ron Lee
----- Original Message -----
From: "Tim Lewis" <timrvator@comcast.net>
Sent: Thursday, May 29, 2008 8:17 PM
Subject: Re: RV-List: Fab Bypass Filter
>
> There's been one RV-6 fatal accident (that I personally know of) traced to
> a snow-clogged air filter. Pilot and passenger killed. I was lucky to
> survive the same thing in my RV-6A several years ago. Van's bypass came
> out shortly thereafter.
>
> Observations: - Snow at night or while IMC may not be visible or
> recognized. - The air filter can be blocked even when there is absolutely
> no visible moisture accumulation on the airframe exterior.
> - "I'll remember to use carb heat as a preventative" can be
> overlooked/forgotten. - Once blockage has occurred, the carb heat in an RV
> (using the carb heat muff) will not melt the snow sufficient to restore
> required air flow into the engine.
>
> Omit a filter bypass at your peril.
>
> Tim
>
> P.S.
>
> Other observations:
> - There exists a breed of FAA "investigator" who will manufacture
> fantastic stories if the facts don't support his pet views.
> - A closed mouth and the AOPA legal services plan can be effective tools
> against this sort of FAA fiction writer.
>
> --
> Tim Lewis -- HEF (Manassas, VA)
> RV-6A N47TD -- 1000 hrs
> RV-10 #40059 under construction
>
>
>>
>>
>> The by-pass door, with magnet, on my O-360 was opening frequently. I
>> suspect on high MAP settings. It has been fixed closed. I have the cable
>> control for the door but have chosen not to put in on. I think this was
>> another CYA issue brought on after Van's became an employee owned
>> business.
>>
>> ----- Original Message ----- From: "Emrath" <emrath@comcast.net>
>> To: <rv-list@matronics.com>
>> Sent: Wednesday, May 28, 2008 10:08 PM
>> Subject: RV-List: Fab Bypass Filter
>>
>>
>>>
>>> Starting around late 2003, or so I think, Van's put out a modification
>>> for
>>> bypassing the filter in the FAB should the filter get clogged. This is
>>> for
>>> the vertical induction carb or FI-servo installations. The original
>>> method
>>> utilized a magnet and then a revised version utilized a cable operated
>>> by
>>> the pilot. At the time, when I first fabricated the FAB, I modified it
>>> according to the original method using the magnet. Today, as I finish
>>> up my
>>> panel and get prepared to put the forward top skin on, I began thinking
>>> about this once more. So, I'm wondering if anyone still has the magnet
>>> version of this modification on their ship and can tell me if the bypass
>>> magnet releases and lets air bypass the filter under NORMAL operating
>>> conditions or not. I'm driving myself crazy trying to determine what
>>> the
>>> NORMAL psi differential might be on this door to compare the calculated
>>> force needed to open the door and the amount the door will see during
>>> NORMAL
>>> operations. Anyone/everyone have some thoughts on this?
>>>
>>> Marty in Brentwood, RV6A
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>>
>
>
>
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