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jeffrey-j-paris(at)excite Guest
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Posted: Sun Jun 05, 2011 3:51 pm Post subject: CHT issues on a 3300 |
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Dear Gurus of the Jabiru Engine World,
I am currently back in flight test mode after finishing the "B" mods to my Zenith CH601XL. Before the Mods I was having CHT issues with the engine after I had installed the recommended " economy carb tuning kit" from Jabiru USA when we attended their excellent engine seminar. Since then I have been battling High CHT's on my #2, #3, #4, #5 cylinders. #1 runs cool and #6 is in the 260 F range.
I have attempted all sorts of methods in an attempt to improve the cooling of my heads. (See attached pictures) During my second to last flight I removed all of my "enhancements" and just went back to factory FWF. Here are the known Facts of my engine:
A) All CHT senders are placed between the plug and a washer (per Pete Krotje of Jab USA)
B) I added a fiberglass cross flow to my rubber elbow to "smooth" out the air in my induction system into the carb.
C) Jettting in the Carb Main Jet #255 Needle Jet #285 ( Per Ben Krotje Jab USA)
D) My Flight Today in stabilized cruise of 2300 RPM to get my lowest CHT #'s:
Cylinder # EGT CHT
1 1320 256
2 1302 313
3 1306 335
4 1343 324
5 1212 296
6 1308 251
E) Oil temp 198 degrees F
F) Pulled plugs burning a nice tan color, exhaust soot is a nice grayish tan as well.
G) Engine starts on first throw of the starter key, but I have to get throttle up or she stalls with the choke-on ( result of Economy tuning mods)
H)m Warm engine start is a no brainer.
Any RPMs past 2300 up to 3000 results in cylinders 2, 3,4, 5 approaching and hitting 350 degress F. I pull back on the throttle and aim my nose down to get things at least into the "yellow zone" of my AuRacle Engine Monitor indications. I have tried all sorts of baffling, extending the lip on my cowls exit for airflow, played with the jetting and induction system of my carb, and listened to all the suggestion threads on the internet and still haven't got things under control.
Any ideas or insights, pictures would be of great help. Thanks for your time and consideration.
Cheers,
Jeff Paris Jab 3300 Zenith Ch601XLB and Jab 3300 Europa Monowheel Classic Rochester, NY KSDC
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aerobiz1(at)gmail.com Guest
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Posted: Sun Jun 05, 2011 7:13 pm Post subject: CHT issues on a 3300 |
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Hi Jeff,
This is what has worked for me.......
1. Measure your actual Main Jet orifice with a metric drill or guage. I found the stamped size (#255 was actually #250, so I took it out to #260 - so from 2.5mm to 2.6mm)
2. Removed the plenum chamber airfoil-shaped flow divider and placed a 1/2 inch diam tube/rod in its place.
3. Drilled the main airbleed out to 3/16 inch _ that's the one that goes from the intake bellmouth straight to the needle jet emulsion tube. Â Remove these, drill airbleed carefully and remove swarf, then before replacing the separate emulsion tube with its 4 x 2.5 mm holes, drill these 4 holes out to 3mm.
While you are about it, you can drill out the choke system fuel bleed jet in the float bowl to 1 - 1.2 mm, and the idle airbleed jet in the bellmouth to 1.2 mm and use #35 pilot jet.
FWIW,
Martin
J230
On Mon, Jun 6, 2011 at 9:47 AM, Jeffrey J Paris <jeffrey-j-paris(at)excite.com (jeffrey-j-paris(at)excite.com)> wrote:
[quote] Â
Dear Gurus of the Jabiru Engine World,
Â
I am currently back in flight test mode after finishing the "B" mods to my Zenith CH601XL. Before the Mods I was having CHT issues with the engine after I had installed the recommended " economy carb tuning kit" from Jabiru USA when we attended their excellent engine seminar. Â Since then I have been battling High CHT's on my #2, #3, #4, #5 cylinders. Â #1 runs cool and #6 is in the 260 F range.
Â
 I have attempted all sorts of methods in an attempt to improve the cooling of my heads.  (See attached pictures)  During my second to last flight I removed all of my "enhancements" and just went back to factory FWF.  Here are the known Facts of my engine:
Â
A) Â All CHT senders are placed between the plug and a washer (per Pete Krotje of Jab USA)
Â
B) I added a fiberglass cross flow to my rubber elbow to "smooth" out the air in my induction system into the carb.
Â
C) Jettting in the Carb  Main Jet #255 Needle Jet #285 ( Per Ben Krotje Jab USA)
Â
D) Â My Flight Today in stabilized cruise of 2300 RPM to get my lowest CHT #'s:
Â
Cylinder # Â Â Â Â EGT Â Â Â Â CHT
Â
1 Â Â Â Â Â Â Â Â Â Â Â Â 1320 Â Â Â Â 256
2 Â Â Â Â Â Â Â Â Â Â Â Â 1302 Â Â Â Â 313
3 Â Â Â Â Â Â Â Â Â Â Â Â 1306 Â Â Â Â 335
4 Â Â Â Â Â Â Â Â Â Â Â Â 1343 Â Â Â Â 324
5 Â Â Â Â Â Â Â Â Â Â Â Â 1212 Â Â Â Â 296
6 Â Â Â Â Â Â Â Â Â Â Â Â 1308 Â Â Â Â 251
Â
E) Oil temp 198 degrees F
F) Pulled plugs burning a nice tan color, exhaust soot is a nice grayish tan as well.
G) Â Engine starts on first throw of the starter key, but I have to get throttle up or she stalls with the choke-on ( result of Economy tuning mods)
H)m  Warm engine start is a no brainer.
Â
  Any RPMs past 2300 up to 3000 results in cylinders 2, 3,4, 5  approaching and hitting 350 degress F.  I pull back on the throttle and aim my nose down to get things at least into the "yellow zone" of my AuRacle Engine Monitor indications.  I have tried all sorts of baffling, extending the lip on my cowls exit for airflow,  played with the jetting and induction system of my carb, and listened to all the suggestion  threads on the internet and still haven't got things under control.
Â
Any ideas or insights, pictures would be of great help. Â Thanks for your time and consideration.
Â
Cheers,
Â
Jeff Paris  Jab 3300 Zenith Ch601XLB  and Jab 3300 Europa Monowheel Classic  Rochester, NY KSDC
Â
Â
[b]
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Clive J
Joined: 03 Nov 2007 Posts: 340 Location: UK
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Posted: Mon Jun 06, 2011 12:31 am Post subject: CHT issues on a 3300 |
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Hi Jeff, those look to be the narrrow air ducts with plugs caps outside. There is a bigger set if your cowls will take them?
Regarding the inlet holes I know there is a school of thought that with the shape you have the air can struggle to go in and would rather go over the top of the cowl.
Try a 'brow' to the holes, tape a strip of card or something over the top coming forward to see if you aren't capturing the air flow.
What's going on at the back cylinder? Is there a space for the air to escape without doing anything? My early 2200 ducts had a hole at the back you could put your hand up (see sketch).
The air will always take the easy way out. You do have the blanks in between the barrels to stop the air getting out that way? I can see a way out at the front on the front cylinder, close those gaps also.
Aside from that......
Good luck, regards, Clive
From: owner-jabiruengine-list-server(at)matronics.com [mailto:owner-jabiruengine-list-server(at)matronics.com] On Behalf Of Jeffrey J Paris
Sent: 06 June 2011 00:47
To: jabiruengines(at)yahoogroups.com; jabiruengine-list(at)matronics.com
Subject: CHT issues on a 3300
Dear Gurus of the Jabiru Engine World,
I am currently back in flight test mode after finishing the "B" mods to my Zenith CH601XL. Before the Mods I was having CHT issues with the engine after I had installed the recommended " economy carb tuning kit" from Jabiru USA when we attended their excellent engine seminar. Since then I have been battling High CHT's on my #2, #3, #4, #5 cylinders. #1 runs cool and #6 is in the 260 F range.
I have attempted all sorts of methods in an attempt to improve the cooling of my heads. (See attached pictures) During my second to last flight I removed all of my "enhancements" and just went back to factory FWF. Here are the known Facts of my engine:
A) All CHT senders are placed between the plug and a washer (per Pete Krotje of Jab USA)
B) I added a fiberglass cross flow to my rubber elbow to "smooth" out the air in my induction system into the carb.
C) Jettting in the Carb Main Jet #255 Needle Jet #285 ( Per Ben Krotje Jab USA)
D) My Flight Today in stabilized cruise of 2300 RPM to get my lowest CHT #'s:
Cylinder # EGT CHT
1 1320 256
2 1302 313
3 1306 335
4 1343 324
5 1212 296
6 1308 251
E) Oil temp 198 degrees F
F) Pulled plugs burning a nice tan color, exhaust soot is a nice grayish tan as well.
G) Engine starts on first throw of the starter key, but I have to get throttle up or she stalls with the choke-on ( result of Economy tuning mods)
H)m Warm engine start is a no brainer.
Any RPMs past 2300 up to 3000 results in cylinders 2, 3,4, 5 approaching and hitting 350 degress F. I pull back on the throttle and aim my nose down to get things at least into the "yellow zone" of my AuRacle Engine Monitor indications. I have tried all sorts of baffling, extending the lip on my cowls exit for airflow, played with the jetting and induction system of my carb, and listened to all the suggestion threads on the internet and still haven't got things under control.
Any ideas or insights, pictures would be of great help. Thanks for your time and consideration.
Cheers,
Jeff Paris Jab 3300 Zenith Ch601XLB and Jab 3300 Europa Monowheel Classic Rochester, NY KSDC
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wb2ssj(at)frontiernet.net Guest
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Posted: Mon Jun 06, 2011 2:48 am Post subject: CHT issues on a 3300 |
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Jeff, call me tonight. Tex 223-3220
[quote] ---
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info(at)flylightning.net Guest
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Posted: Mon Jun 06, 2011 12:33 pm Post subject: CHT issues on a 3300 |
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Jeff,
One thing missing is the dam in the front of the air-duct. This starts in the bottom of the duct and runs up to about the welsh plug in the head above the rocker shaft, may be about 2” tall.
If both ducts are like this in the front the majority of your cooling air is going underneath the front cylinder. This will also contribute to a lower pressure differential between the cowl and the duct, limiting the amount of air passing the cylinders.
I can provide a picture or two if you like.
Nick Otterback
Arion Aircraft
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info(at)flylightning.net Guest
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Posted: Mon Jun 06, 2011 12:39 pm Post subject: CHT issues on a 3300 |
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Jeff,
Along with my last email here is a picture. These are a new set of ducts, however it is important to put this air-dam in the front of the older ones as well.
Note in the right side of the picture is a cut out in the fins and a small half moon shape plug visible. That plug is for an oil galley, I would suggest making that dam this tall.
Thanks
Nick Otterback
Arion Aircraft
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jeffrey-j-paris(at)excite Guest
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Posted: Tue Jun 07, 2011 12:48 pm Post subject: CHT issues on a 3300 |
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Dear Jabiru 3300 Guru's,
First of all thank you for all of your input I appreciate as I battle the heat demons in my cowl. Yesterday I spent the day working on my CHT cooling issues. I have attached some pictures for everyone to look at. Anyways in addition to adding some aluminum sheet which profiles and seals in inboard baffles to the cylinders I attempted to add airdams to the front of the baffles, per Nick Otterback's suggestion. In addition, I added some rubber stuffing to seal up the back of baffles and I added rubber washers over each sparkplug to seal up and air leaks from the plugs as they protrude through the old style baffles.
First flight today yielded these numbers in cruise:
RPM 2500-Note had to use to keep CHTs in at least the yellow range. All powered climbs yielded high temps approachin 350F. air temp at time of flight was 75 F and oil temp was 212F.
Cylinder EGT (F) CHT (F)
1 1315 265
2 1271 330
3 1311 315
4 1353 315
5 1219 326
6 1338 292
RPM 2400-Note had to use to keep CHTs in at least the yellow range. All powered climbs yielded high temps approachin 350F. In addition, I changed these items I removed the rubber from the back of the baffles, removed the butterfly baffles from underneath the cylinders, and added improved airdams to the fron of the 2,4,6 cylinder bank. Outside temp at flight was 88 F Oil Temp. 212F
Cylinder EGT (F) CHT (F)
1 1285 256
2 1258 316
3 1282 318
4 1347 315
5 1204 271
In a sense I have made some progress. However, I cannot do a normal rate of climb without cylinders 2,3,4,5 heading for the races towards 350F and I can't even imagine what temps I would see at max gross weight with a passenger. So I am obviously not getting the utility out of the aircraft as I would like.
Thanks for your time and consideration. I just want to go out flying like the old days before I messed things up! LOL
Cheers Jeff Paris 2 Jabs in the nest/both sick
2514.jpg Shows a "scoop" that I added to aid in my old style oil cooler Seems to work temps on cooler days 190F hot days 212F.
2515.jpg Top of engine looking forward.
2529.jpg I added some aluminum sheet, cut precisely to the cylinder profile to seal up both inside baffles.
2530.jpg Per Nick Otterback's / Flylightning suggestion I added an air dam to the front right baffle on the 2,4,6 cylinder bank
2531.jpg Shows the 1,3,5 cylinder baffle entrance
2532.jpg I experimented with adding the butterfly cylinder baffles to the underside of the cylinders, I tested them during my first flight today and removed them for the second flight
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aerobiz1(at)gmail.com Guest
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Posted: Tue Jun 07, 2011 1:39 pm Post subject: CHT issues on a 3300 |
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Jeff,
I reckon the angle that your oil cooler is presenting to the incoming air is too great. Â A normal tube and fin radiator like that does NOT like any more than 20 degrees before the air 'bounces' off. Â Less than 7 degrees is ideal.
Remind me, what instrumentation are you using to gain these numbers ?
We have had issues with a Dynon reading high....
Martin
On Wed, Jun 8, 2011 at 6:44 AM, Jeffrey J Paris <jeffrey-j-paris(at)excite.com (jeffrey-j-paris(at)excite.com)> wrote:
[quote] Dear Jabiru 3300 Guru's,
Â
First of all thank you for all of your input I appreciate as I battle the heat demons in my cowl.  Yesterday I spent the day working on my CHT cooling issues.  I have attached some pictures for everyone to look at.  Anyways in addition to adding some aluminum sheet which profiles and seals in inboard baffles to the  cylinders I attempted to add airdams to the front of the baffles, per Nick Otterback's suggestion.  In addition, I added some rubber stuffing to seal up the back of baffles and I added rubber washers over each sparkplug to seal up and air leaks from the plugs as they protrude through the old style baffles. Â
Â
First flight today yielded these numbers in cruise:
Â
RPM 2500-Note had to use to keep CHTs in at least the yellow range. All powered climbs yielded high temps approachin 350F. air temp at time of flight was 75 F Â and oil temp was 212F.
Â
Cylinder    EGT (F)    CHT (F)
1 Â Â Â Â Â Â Â Â Â 1315 Â Â Â Â Â Â 265
2 Â Â Â Â Â Â Â Â Â 1271 Â Â Â Â Â Â 330
3 Â Â Â Â Â Â Â Â Â 1311 Â Â Â Â Â Â 315
4 Â Â Â Â Â Â Â Â Â 1353 Â Â Â Â Â Â 315
5 Â Â Â Â Â Â Â Â Â 1219 Â Â Â Â Â Â 326
6 Â Â Â Â Â Â Â Â Â 1338 Â Â Â Â Â Â 292
Â
RPM 2400-Note had to use to keep CHTs in at least the yellow range. All powered climbs yielded high temps approachin 350F. Â In addition, I changed these items I removed the rubber from the back of the baffles, removed the butterfly baffles from underneath the cylinders, and added improved airdams to the fron of the 2,4,6 cylinder bank. Â Outside temp at flight was 88 F Â Oil Temp. Â 212F
Â
Cylinder    EGT (F)    CHT (F)
1 Â Â Â Â Â Â Â Â Â 1285 Â Â Â Â Â Â 256
2 Â Â Â Â Â Â Â Â Â 1258 Â Â Â Â Â Â 316
3 Â Â Â Â Â Â Â Â Â 1282 Â Â Â Â Â Â 318
4 Â Â Â Â Â Â Â Â Â 1347 Â Â Â Â Â Â 315
5 Â Â Â Â Â Â Â Â Â 1204 Â Â Â Â Â Â 271
Â
In a sense I have made some progress. Â However, Â I cannot do a normal rate of climb without cylinders 2,3,4,5 heading for the races towards 350F Â and I can't even imagine what temps I would see at max gross weight with a passenger. Â So I am obviously not getting the utility out of the aircraft as I would like. Â
Â
Thanks for your time and consideration. Â I just want to go out flying like the old days before I messed things up! Â LOL
Â
Cheers Jeff Paris  2 Jabs in the nest/both sick
Â
Â
Â
2514.jpg  Shows a "scoop" that I added to aid in my old style oil cooler Seems to work temps on cooler days 190F  hot days 212F.
Â
2515.jpg  Top of engine looking forward.
Â
2529.jpg  I added some aluminum sheet, cut precisely to the cylinder profile to seal up both inside baffles.
Â
 2530.jpg  Per Nick Otterback's / Flylightning suggestion I added an air dam to the front right baffle on the 2,4,6 cylinder bank
Â
2531.jpg  Shows the 1,3,5 cylinder baffle entrance
Â
2532.jpg  I experimented with adding the butterfly cylinder baffles to the underside of the cylinders, I tested them during my first flight today and           removed them for the second flight
[b]
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jerryvmd
Joined: 18 Apr 2008 Posts: 25
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Posted: Wed Jun 08, 2011 10:04 am Post subject: CHT issues on a 3300 |
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Jeff,
I had similar issues early on. Check the archives as there is alot of
info on cooling issues. Two things that worked for me. 1. It appears
that your air dams at the entrance to the Ram Ducts my be too low. 2.
Remove some of the cowl on the bottom half at the air exit around the
nose wheel strut. Then temporarily duct tape a piece of aluminum to
make the rim bevel larger. This causes a negative air pressure actually
drawing more air out the bottom. In effect creating more air moving
from the inlets through the cowl/cylinders to the exit. The size of the
exit hole is important but the larger lip helped alot. I now have the
opposite problem. In the winter my cylinder head temps tend to run cold
(several read only 220 to 250) with a Grand Rapids EIS. In summer
(Pennsylvania) in a long climb number 3 cylinder might get to 350 but
returns to upper 200's after lowering nose to cruise.
Jerry
On 6/7/2011 4:44 PM, Jeffrey J Paris wrote:
Quote: | Dear Jabiru 3300 Guru's,
First of all thank you for all of your input I appreciate as I battle
the heat demons in my cowl. Yesterday I spent the day working on my
CHT cooling issues.
|
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dons701
Joined: 22 May 2009 Posts: 80 Location: Hershey, PA
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Posted: Wed Jun 08, 2011 10:26 am Post subject: Re: CHT issues on a 3300 |
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Exactly what I had to do with my CH701 Jerry. Cut the exit much larger and bought some white aluminum flashing to make a 4 inch lip to start with. My temps took a dive. My inlets are about 3 to 4 times the size of Jeff's much faster plane......Don B
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Jabiru 2200A #2456 95 hours
Sensenich Wood 64-PJ-36 Prop |
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Clive J
Joined: 03 Nov 2007 Posts: 340 Location: UK
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Posted: Wed Jun 08, 2011 12:11 pm Post subject: CHT issues on a 3300 |
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When I had the Rotax cowl on my Esqual I got a step change in the
cooling by adding an outlet baffle.
It went back three times as far as it went down, so it was more
streamlined than the 'lips' that I've seen added by others. I don't have
a picture of mine but I do of the one I copied, Dave Mc was good enough
to send me the attached.
If you think about it, a hanging baffle on the cowl outlet will create
some suction but not as much as something more streamlined. I cured my
head cooling with the duct like this but went on to change to a new cowl
for oil cooling reasons.
I would recommend trying a more streamlined 'baffle/duct' on the outlet.
Regarding the dam on the inlet, there is a school of thought that the
tumbling effect of a vertical baffle is better than a 'ramp' I recall
someone trying both and finding the vertical baffle better.
The hanging baffles inside the ducts that restrict airflow, restrict
airflow so there is a balance between how much they restrict and how
much they deflect, any restriction is not a good thing with marginal
cooling.
Roger mentioned the smoke test's to see where the airflow goes, this
will show mow much air gets deflected over the cowl and so bypasses the
ram air entry. Another reason why creating more 'pull' on the outlet is
so successful.....IMHO.
Regards, Clive
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