 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
jeff(at)rmmm.net
Guest
|
 Posted: Tue Aug 08, 2006 6:39 am Post subject: Air Box Falling Off |
 |
|
Hi All,
I am currently adding some strength with 3 layers of bid around the
tubes that the carbs connect to on the air box. They have started to
collapse from the pressure of the clamps. I have had the whole box
come off from the 2 rubber hoses 3 times. Yes I have the brace in the
back going to the motor mount. I even safety wired it to the carbs and
one of the wires eventually broke. It is the standard NACA on the top
of the cowl with the 912-S. Has anyone else experienced this and is
there another way of connecting it to the carbs or reinforcing the
connection to the carbs?
I believe it may be from the pressure of the ram air coming in from the
over size NACA on top. I have all that air going into a plenum thats
mounted to the top of the air box. I was thinking of making the plenum
opening smaller so some of the air just goes into the engine area and
less pressure is placed on the top of the box.
All Ideas are welcome as I am out of them. Thanks in advance for any
help!
Jeff
A258 Flying off the 40
| | - The Matronics Europa-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?Europa-List |
|
|
|
| Back to top |
|
 |
jthursby(at)tampabay.rr.c
Guest
|
| Posted: Tue Aug 08, 2006 7:13 am Post subject: Air Box Falling Off |
|
|
Hi Jeff, Bond in some short pieces of aluminum tubing for the clamping area.
It's a combination of pressure (clamps) and heat.
Jim Thursby
--
| | - The Matronics Europa-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?Europa-List |
|
|
|
| Back to top |
|
|
pete(at)lawless.info
Guest
|
| Posted: Tue Aug 08, 2006 8:48 am Post subject: Air Box Falling Off |
|
|
Hi Jeff
I had the same problem last year. I cut off the collapsed tube from the
airbox and replaced it with some aluminium tube glassed into position. No
further problems in nearly 100 hours and you can do the clamps up as tight
as you like.
Regards
Pete
| | - The Matronics Europa-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?Europa-List |
|
|
|
| Back to top |
|
|
jeff(at)rmmm.net
Guest
|
| Posted: Tue Aug 08, 2006 9:15 am Post subject: Air Box Falling Off |
|
|
Thanks Guys! I don't know why I didn't think of that. Going after some
tubing now.
Jeff
A258 Trying to find time to fly off the 40
On Aug 8, 2006, at 11:47 AM, Pete Lawless wrote:
| Quote: |
Hi Jeff
I had the same problem last year. I cut off the collapsed tube from
the
airbox and replaced it with some aluminium tube glassed into position.
No
further problems in nearly 100 hours and you can do the clamps up as
tight
as you like.
Regards
Pete
|
| | - The Matronics Europa-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?Europa-List |
|
|
|
| Back to top |
|
|
kheindl(at)msn.com
Guest
|
| Posted: Tue Aug 08, 2006 10:26 am Post subject: Air Box Falling Off |
|
|
Jeff,
Exactly the same kept happening to me. The airbox tubes simply aren't strong
enough, and you can't really tell when they are collapsing.
I have a very simple fix: get a piece of 1 7/8th inch alu tube, cut off two
short pieces and jam them into the inside of the tubes. ACS will sell you
12" for a few dollars.
To ensure that the airbox never comes off, I also jammed a piece of blue
foam between the box and the firewall.
Hope that makes sense.
Karl
| Quote: | From: JEFF ROBERTS <jeff(at)rmmm.net>
Reply-To: europa-list(at)matronics.com
To: europa-list(at)matronics.com
Subject: Air Box Falling Off
Date: Tue, 8 Aug 2006 12:16:19 -0500
Hi All,
I am currently adding some strength with 3 layers of bid around the tubes
that the carbs connect to on the air box. They have started to collapse
from the pressure of the clamps. I have had the whole box come off from
the 2 rubber hoses 3 times. Yes I have the brace in the back going to the
motor mount. I even safety wired it to the carbs and one of the wires
eventually broke. It is the standard NACA on the top of the cowl with the
912-S. Has anyone else experienced this and is there another way of
connecting it to the carbs or reinforcing the connection to the carbs?
I believe it may be from the pressure of the ram air coming in from the
over size NACA on top. I have all that air going into a plenum thats
mounted to the top of the air box. I was thinking of making the plenum
opening smaller so some of the air just goes into the engine area and less
pressure is placed on the top of the box.
All Ideas are welcome as I am out of them. Thanks in advance for any help!
Jeff
A258 Flying off the 40
http://www.matronics.com/Navigator?Europa-List
http://wiki.matronics.com
|
| | - The Matronics Europa-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?Europa-List |
|
|
|
| Back to top |
|
|
jeff(at)rmmm.net
Guest
|
| Posted: Tue Aug 08, 2006 11:23 am Post subject: Air Box Falling Off |
|
|
Thanks Karl,
I just ordered a foot through WICKS. I'll bond them in with redux then
safety wire the box back on as we'll.
Jeff
A258
Do not archive.
On Aug 8, 2006, at 1:24 PM, Karl Heindl wrote:
| Quote: |
Jeff,
Exactly the same kept happening to me. The airbox tubes simply aren't
strong enough, and you can't really tell when they are collapsing.
I have a very simple fix: get a piece of 1 7/8th inch alu tube, cut
off two short pieces and jam them into the inside of the tubes. ACS
will sell you 12" for a few dollars.
To ensure that the airbox never comes off, I also jammed a piece of
blue foam between the box and the firewall.
Hope that makes sense.
Karl
> From: JEFF ROBERTS <jeff(at)rmmm.net>
> Reply-To: europa-list(at)matronics.com
> To: europa-list(at)matronics.com
> Subject: Air Box Falling Off
> Date: Tue, 8 Aug 2006 12:16:19 -0500
>
>
>
> Hi All,
> I am currently adding some strength with 3 layers of bid around the
> tubes that the carbs connect to on the air box. They have started to
> collapse from the pressure of the clamps. I have had the whole box
> come off from the 2 rubber hoses 3 times. Yes I have the brace in
> the back going to the motor mount. I even safety wired it to the
> carbs and one of the wires eventually broke. It is the standard NACA
> on the top of the cowl with the 912-S. Has anyone else experienced
> this and is there another way of connecting it to the carbs or
> reinforcing the connection to the carbs?
> I believe it may be from the pressure of the ram air coming in from
> the over size NACA on top. I have all that air going into a plenum
> thats mounted to the top of the air box. I was thinking of making the
> plenum opening smaller so some of the air just goes into the engine
> area and less pressure is placed on the top of the box.
> All Ideas are welcome as I am out of them. Thanks in advance for any
> help!
> Jeff
> A258 Flying off the 40
>
>
> http://www.matronics.com/Navigator?Europa-List
> http://wiki.matronics.com
>
http://www.matronics.com/Navigator?Europa-List
Limit Now At: 1MB - 08/08/06 (was 2MB)
|
| | - The Matronics Europa-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?Europa-List |
|
|
|
| Back to top |
|
|
ami(at)mcfadyean.freeserv
Guest
|
| Posted: Tue Aug 08, 2006 12:30 pm Post subject: Air Box Falling Off |
|
|
<<I was thinking of making the plenum
| Quote: | .... so some of the air just goes into the engine area and less pressure
is placed on the top of the box.
>
I had in mind doing that by means of leaving off the rubber sealing tongue
|
that contacts the top of the airbox, but in order to use any "surplus" air
for general cooling of the under-cowl/electrics and to allow automatic
venting of trapped hot air after shutdown. The loss in recovered pressure to
the air box is probably negligible as the cowl is already pressurised from
the forward facing nostrils (less what is lost through the exits). No
results yet or confirmation that the flow through the NACA doesn't reverse
at high AoA..
Duncan McF.
---
| | - The Matronics Europa-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?Europa-List |
|
|
|
| Back to top |
|
|
karelvranken(at)hotmail.c
Guest
|
| Posted: Tue Aug 08, 2006 12:46 pm Post subject: Air Box Falling Off |
|
|
Jeff,
It's a question of temperature and clamp pressure. Note that the tubes are
slightly conic. I found the whole box of pour design. I toke a negative of
it in two halves.
Then I made a new box with a mix of carbon and glass and I insert an
aluminium tube to match the carb intake. Carbon is conductive that is
whatfore I make a layer of glass in contact with the aluminium.
Great pleasure in building,
Karel Vranken. # 447 Mono XS Rotax 912S Airmaster CSU F-PKRL final control
september 7th.
---
| | - The Matronics Europa-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?Europa-List |
|
|
|
| Back to top |
|
|
topglock(at)cox.net
Guest
|
| Posted: Tue Aug 08, 2006 3:28 pm Post subject: Air Box Falling Off |
|
|
Jeff,
Exactly the same problem, here. Drove a large socket into the hole to
expand the crushed glass, then added one layer of bid to the outside.
After that cured, I added three layers of bid to the inside. Problem
solved...
Don't close the air duct. You need all the air you can get, to those
carbs...
Jeff - Baby Blue
200 hours and the first annual is in the books...
JEFF ROBERTS wrote:
| Quote: |
Hi All,
I am currently adding some strength with 3 layers of bid around the
tubes that the carbs connect to on the air box. They have started to
collapse from the pressure of the clamps. I have had the whole box
come off from the 2 rubber hoses 3 times. Yes I have the brace in the
back going to the motor mount. I even safety wired it to the carbs and
one of the wires eventually broke. It is the standard NACA on the top
of the cowl with the 912-S. Has anyone else experienced this and is
there another way of connecting it to the carbs or reinforcing the
connection to the carbs?
I believe it may be from the pressure of the ram air coming in from
the over size NACA on top. I have all that air going into a plenum
thats mounted to the top of the air box. I was thinking of making the
plenum opening smaller so some of the air just goes into the engine
area and less pressure is placed on the top of the box.
All Ideas are welcome as I am out of them. Thanks in advance for any
help!
Jeff
A258 Flying off the 40
http://www.matronics.com/Navigator?Europa-List
http://wiki.matronics.com
|
| | - The Matronics Europa-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?Europa-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
