 |
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: Thu Jul 03, 2008 12:37 pm Post subject: Cooling & Cowling |
 |
|
Since I struggled with the cooling on my 912-S Tri gear for so very
long I thought I'd throw my thoughts into this subject. I have found
the air cooling of the fins to be inadequate. If you look at the round
inlets in relation to where the top of the engine sits you will find
they are too low and too outside. After trying everything to get mine
to cool on the ground and in the climb I finally got mad and took a
drummel tool to the inlets and opened them up a bit to the top and in
towards the spinner. For now... she looks a little sad but my CHT's
instantly dropped about 10 to 15 degrees. I'm going to work on the
inside of these holes next to provide an expanding 1" wall to eliminate
any turbulence of the incoming air flow.
Believe me I'v tried everything everyone has mentioned here from
closing up all the gaps around the rad to closing the gills. Nothing
did more for taxi and climb cooling than raising these holes. If you
look at all the LSA's with rotax engines the intakes are higher so the
air can get to the top of the engine before it's pulled or pushed down
through the fins. The real solution would be for rotax to start selling
plenums like the Jab's then route the hoses to fit over them.
Regards,
Jeff R.
A258 - N128LJ / Gold Rush 130 hours and enjoying every flight more.
PS. Jeff of Baby blue... If your making a mold that turns out
successfully try and saving it. I would love a better designed cowl.
;0)
| | - 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: Thu Jul 03, 2008 12:52 pm Post subject: Cooling & Cowling |
|
|
Jeff,
Should I end up with a cowl that pleases me, esthetically and does the
job on cooling and air speed, I will use it as a plug and build a mold
for it. I'm sure you could twist my arm for use of the mold... 
Jeff - Baby Blue
JEFF ROBERTS wrote:
| Quote: | Since I struggled with the cooling on my 912-S Tri gear for so very long
I thought I'd throw my thoughts into this subject. I have found the air
cooling of the fins to be inadequate. If you look at the round inlets in
relation to where the top of the engine sits you will find they are too
low and too outside. After trying everything to get mine to cool on the
ground and in the climb I finally got mad and took a drummel tool to the
inlets and opened them up a bit to the top and in towards the spinner.
For now... she looks a little sad but my CHT's instantly dropped about
10 to 15 degrees. I'm going to work on the inside of these holes next to
provide an expanding 1" wall to eliminate any turbulence of the incoming
air flow.
Believe me I'v tried everything everyone has mentioned here from closing
up all the gaps around the rad to closing the gills. Nothing did more
for taxi and climb cooling than raising these holes. If you look at all
the LSA's with rotax engines the intakes are higher so the air can get
to the top of the engine before it's pulled or pushed down through the
fins. The real solution would be for rotax to start selling plenums like
the Jab's then route the hoses to fit over them.
Regards,
Jeff R.
A258 - N128LJ / Gold Rush 130 hours and enjoying every flight more.
PS. Jeff of Baby blue... If your making a mold that turns out
successfully try and saving it. I would love a better designed cowl. ;0)
size color="#000000" face="courier new,courier">
href="http://www.matronics.com/Navigator?Europa-List">http://www.matronics.com/Navigator?Europa-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
------------------------------------------------------------------------
Checked by AVG.
|
| | - 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 |
|
|
Brian Davies
Joined: 10 Jan 2006
Posts: 124
Location: uk
|
| Posted: Thu Jul 03, 2008 1:53 pm Post subject: Cooling & Cowling |
|
|
Jeff,
Do you have the Rotax fibre glass cooling cowl fitted to your engine? This picks up the air from the Stbd front inlet and forces it down through the fins.
Brian Davies
G-DDBD 912S Trigear
From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of JEFF ROBERTS
Sent: 03 July 2008 21:34
To: europa-list(at)matronics.com
Subject: Cooling & Cowling
Since I struggled with the cooling on my 912-S Tri gear for so very long I thought I'd throw my thoughts into this subject. I have found the air cooling of the fins to be inadequate. If you look at the round inlets in relation to where the top of the engine sits you will find they are too low and too outside. After trying everything to get mine to cool on the ground and in the climb I finally got mad and took a drummel tool to the inlets and opened them up a bit to the top and in towards the spinner. For now... she looks a little sad but my CHT's instantly dropped about 10 to 15 degrees. I'm going to work on the inside of these holes next to provide an expanding 1" wall to eliminate any turbulence of the incoming air flow.
Believe me I'v tried everything everyone has mentioned here from closing up all the gaps around the rad to closing the gills. Nothing did more for taxi and climb cooling than raising these holes. If you look at all the LSA's with rotax engines the intakes are higher so the air can get to the top of the engine before it's pulled or pushed down through the fins. The real solution would be for rotax to start selling plenums like the Jab's then route the hoses to fit over them.
Regards,
<?fontfamily><?param Helvetica>Jeff R.
A258 - N128LJ / Gold Rush 130 hours and enjoying every flight more.
PS. Jeff of Baby blue... If your making a mold that turns out successfully try and saving it. I would love a better designed cowl. ;0)<?/fontfamily>
<?pre><?b><?font size=2 color="#000000" face="courier ================= Features Un/Subscription, Photoshare, and href="http://www.matronics.com/navigator?europa-list">http://www.matronics.com/Navigator?Europa-List<?/a> --> <?a href="http://forums.matronics.com">http://forums.matronics.com<?/a> -Matt <?a href="http://www.matronics.com/contribution">http://www.matronics.com/contribution<?/a> ===========
<?/b><?/font><?/pre><?/body><?/html>
No virus found in this incoming message.
Checked Date: 02/07/2008 19:02
[quote][b]
| | - 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 |
|
|
grahamsingleton(at)btinte
Guest
|
| Posted: Thu Jul 03, 2008 2:14 pm Post subject: Cooling & Cowling |
|
|
Jeff
I fiddled with Jab 6 baffles and plenums for weeks. Finally Tony Higgins
told us to put a box below the air filter plenum to give non curving
airflow into the mouth of the carburetter. That cured the very uneven
CHTs instantly. It seems all the cooling problems were caused by uneven
mixture distribution from the single carb on the Jab. Tony never says
anything on here unfortunately.
Graham
JEFF ROBERTS wrote:
| Quote: | Since I struggled with the cooling on my 912-S Tri gear for so very
long I thought I'd throw my thoughts into this subject. I have found
the air cooling of the fins to be inadequate. If you look at the round
inlets in relation to where the top of the engine sits you will find
they are too low and too outside. After trying everything to get mine
to cool on the ground and in the climb I finally got mad and took a
drummel tool to the inlets and opened them up a bit to the top and in
towards the spinner. For now... she looks a little sad but my CHT's
instantly dropped about 10 to 15 degrees. I'm going to work on the
inside of these holes next to provide an expanding 1" wall to
eliminate any turbulence of the incoming air flow.
Believe me I'v tried everything everyone has mentioned here from
closing up all the gaps around the rad to closing the gills. Nothing
did more for taxi and climb cooling than raising these holes. If you
look at all the LSA's with rotax engines the intakes are higher so the
air can get to the top of the engine before it's pulled or pushed down
through the fins. The real solution would be for rotax to start
selling plenums like the Jab's then route the hoses to fit over them.
Regards,
Jeff R.
A258 - N128LJ / Gold Rush 130 hours and enjoying every flight more.
|
| | - 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: Thu Jul 03, 2008 2:36 pm Post subject: Cooling & Cowling |
|
|
Jeff,
If you are a good eater you need a good bowel movement. You may create openings in the cowling for air entree, if you don't create an excit the air will stay immobile under the cowling. For instance: if you enlarge the forward round inlets as I did then the surface for air intake enlarges by the square diameter. Second thing to do like I did: In the original cowling concept I felt some warm air entering trough the wheel well and the landing gear arm sleeve. After my modification I can put the Jeppensen airfield leaves on the sleeve and they stay fixed because there is a suction outwards now. I also measured under cowling temperatures and after my mods they are the same as outside temperatures + - 5°C. Terry Seaver experimented also in this matter and finaly cut down the end of the inner aluminium duct. I wish you courage and fun during your experiment.
Best regards,
Karel Vranken, F-PKRL actually 160 hours. 912 ULS Airmaster CSU
[quote] ---
| | - 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: Thu Jul 03, 2008 4:07 pm Post subject: Cooling & Cowling |
|
|
Brian,
When I bought my kit from Florida in 2002 I was told I didn't need it.
Most people then didn't do the third opening. If I had to do it over I
would have not listened to them but hind sight?
Jeff R.
A258 - N128LJ / Gold Rush 125 hours and climbing slowly.
On Jul 3, 2008, at 4:50 PM, Brian Davies wrote:
| Quote: | Jeff,
Do you have the Rotax fibre glass cooling cowl fitted to your engine?
This picks up the air from the Stbd front inlet and forces it down
through the fins.
Brian Davies
G-DDBD 912S Trigear
From: owner-europa-list-server(at)matronics.com
[mailto:owner-europa-list-server(at)matronics.com] On Behalf Of JEFF
ROBERTS
Sent: 03 July 2008 21:34
To: europa-list(at)matronics.com
Subject: Cooling & Cowling
Since I struggled with the cooling on my 912-S Tri gear for so very
long I thought I'd throw my thoughts into this subject. I have found
the air cooling of the fins to be inadequate. If you look at the round
inlets in relation to where the top of the engine sits you will find
they are too low and too outside. After trying everything to get mine
to cool on the ground and in the climb I finally got mad and took a
drummel tool to the inlets and opened them up a bit to the top and in
towards the spinner. For now... she looks a little sad but my CHT's
instantly dropped about 10 to 15 degrees. I'm going to work on the
inside of these holes next to provide an expanding 1" wall to
eliminate any turbulence of the incoming air flow.
Believe me I'v tried everything everyone has mentioned here from
closing up all the gaps around the rad to closing the gills. Nothing
did more for taxi and climb cooling than raising these holes. If you
look at all the LSA's with rotax engines the intakes are higher so the
air can get to the top of the engine before it's pulled or pushed down
through the fins. The real solution would be for rotax to start
selling plenums like the Jab's then route the hoses to fit over them.
Regards,
Jeff R.
A258 - N128LJ / Gold Rush 130 hours and enjoying every flight more.
PS. Jeff of Baby blue... If your making a mold that turns out
successfully try and saving it. I would love a better designed cowl.
;0)
|
| | - 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
