Today's Message Index:
----------------------
1. 10:15 AM - Re: Engine cooling Louver Vents (FLYaDIVE)
2. 10:41 AM - Re: Engine cooling Louver Vents (Carl Meek)
3. 03:25 PM - Re: Engine cooling Louver Vents (FLYaDIVE)
Message 1
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| Subject: | Re: Engine cooling Louver Vents |
Carl:
Did you receive the email and pictures? Wes, tells me that the pictures
did not get posted.
Barry
On Mon, Jul 23, 2012 at 3:38 AM, Carl Meek <carlmeek@gmail.com> wrote:
> Barry=85 I'm interested in your concept here, but I can't understand it.
> Any chance of a photo?
>
> I'm currently working on cooling my Jabiru 3300 in the Europa.
>
> I've put a 5" lip on the bottom of the cowl exit and this has made a big
> difference to temperatures in the climb, but it has highlighted uneven
> cylinder cooling - so my next project is to put some dams to force air
> between the middle cylinder, and also to route HT leads straight out away
> from air-flow rather than the bundle of cables blocking it all up.
>
> -Carl.
>
> On 23 Jul 2012, at 01:21, FLYaDIVE wrote:
>
> Jeff:
>
> The hard and fast rule for forced air cooling is the EXHAUST area must be
> at least TWICE the size INTAKE area.
> Another simple little trick in cooling is to create a negative pressure
> area directly at the ramp exhaust port(s). This can be done with a simpl
e
> piece of aluminum strip 1 1/2 to 2" wide and long enough to span the ramp
> area and bent lengthwise down the center-line at a 45 deg angle sort of
> like this
> ---> ___/ [But flip it so it angles DOWN] Then rivet it to the edge o
f
> the air exhaust ramp. Works great and you will NEVER notice any drag...
> Just lower temps.
>
> Barry
>
>
> On Fri, Jul 20, 2012 at 2:36 PM, Jeffrey J Paris <
> jeffrey-j-paris@excite.com> wrote:
>
>> Gentlepeople,
>>
>> A few months ago someone out on our lists mentioned that they were usin
g
>> some louvered vents in an aid to cooling their Jabiru installation. I
>> would be interested to see if anyone has some anecdotal or actual
>> experience with utilizing louvered vents on the bottom of a cowl in an
>> effort to aid and imnprove engine cooling.
>>
>> In my case I have a Jab3300 powered Zentith Zodiac in which I'm pretty
>> much dialed into in terms of cooling. However, I am also a builder of a
>> Jab 3300 powered Europa Classic Monowheel and due to the fact that the
>> footwells and the main landing gear truncate the bottom opening of the c
owl
>> making a clean and big enough exit a bit "messy".
>>
>> I am curious to see if a set of vented louvers running parallel and
>> under each cylinder would create enough pull to enhance cooling? (Bonanz
as
>> have em') Do the experts think I might have some luck with just such an
>> installation?
>>
>> Thanks for your time and consderation.
>>
>> Jeff Paris
>>
>> *
>>
>> ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-L
isttp://forums.matronics.com
>> _blank">http://www.matronics.com/contribution
>> *
>>
>>
> *
>
> href="http://www.matronics.com/Navigator?JabiruEngine-List">http://www.
matronics.com/Navigator?JabiruEngine-List
> href="http://forums.matronics.com/">http://forums.matronics.com
> href="http://www.matronics.com/contribution">http://www.matronics.com/c
ontribution
> *
>
>
> *
>
===========
===========
===========
===========
> *
>
>
Message 2
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| Subject: | Re: Engine cooling Louver Vents |
Hi Barry,
Yes, I received the pictures fine. I'm just trying to puzzle out exactly
where the thing mounts =85.
Attached is a picture of my new "lip"
Regards,
-Carl.
On 24 Jul 2012, at 18:14, FLYaDIVE wrote:
> Carl:
>
> Did you receive the email and pictures? Wes, tells me that the
pictures did not get posted.
>
> Barry
>
> On Mon, Jul 23, 2012 at 3:38 AM, Carl Meek <carlmeek@gmail.com> wrote:
> Barry=85 I'm interested in your concept here, but I can't understand
it. Any chance of a photo?
>
> I'm currently working on cooling my Jabiru 3300 in the Europa.
>
> I've put a 5" lip on the bottom of the cowl exit and this has made a
big difference to temperatures in the climb, but it has highlighted
uneven cylinder cooling - so my next project is to put some dams to
force air between the middle cylinder, and also to route HT leads
straight out away from air-flow rather than the bundle of cables
blocking it all up.
>
> -Carl.
>
> On 23 Jul 2012, at 01:21, FLYaDIVE wrote:
>
>> Jeff:
>>
>> The hard and fast rule for forced air cooling is the EXHAUST area
must be at least TWICE the size INTAKE area.
>> Another simple little trick in cooling is to create a negative
pressure area directly at the ramp exhaust port(s). This can be done
with a simple piece of aluminum strip 1 1/2 to 2" wide and long enough
to span the ramp area and bent lengthwise down the center-line at a 45
deg angle sort of like this
>> ---> ___/ [But flip it so it angles DOWN] Then rivet it to the
edge of the air exhaust ramp. Works great and you will NEVER notice any
drag... Just lower temps.
>>
>> Barry
>>
>>
>> On Fri, Jul 20, 2012 at 2:36 PM, Jeffrey J Paris
<jeffrey-j-paris@excite.com> wrote:
>> Gentlepeople,
>>
>> A few months ago someone out on our lists mentioned that they were
using some louvered vents in an aid to cooling their Jabiru
installation. I would be interested to see if anyone has some anecdotal
or actual experience with utilizing louvered vents on the bottom of a
cowl in an effort to aid and imnprove engine cooling.
>>
>> In my case I have a Jab3300 powered Zentith Zodiac in which I'm
pretty much dialed into in terms of cooling. However, I am also a
builder of a Jab 3300 powered Europa Classic Monowheel and due to the
fact that the footwells and the main landing gear truncate the bottom
opening of the cowl making a clean and big enough exit a bit "messy".
>>
>> I am curious to see if a set of vented louvers running parallel and
under each cylinder would create enough pull to enhance cooling?
(Bonanzas have em') Do the experts think I might have some luck with
just such an installation?
>>
>> Thanks for your time and consderation.
>>
>> Jeff Paris
>>
>>
>> ist"
target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List
>> tp://forums.matronics.com
>> _blank">http://www.matronics.com/contribution
>>
>>
>>
>>
>>
href="http://www.matronics.com/Navigator?JabiruEngine-List">http://www.m
atronics.com/Navigator?JabiruEngine-List
>> href="http://forums.matronics.com/">http://forums.matronics.com
>>
href="http://www.matronics.com/contribution">http://www.matronics.com/co
ntribution
>>
>
>
>
> ist"
target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List
> tp://forums.matronics.com
> _blank">http://www.matronics.com/contribution
>
>
>
>
>
Message 3
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| Subject: | Re: Engine cooling Louver Vents |
WOW Carl...
That this is almost pointing straight down. Isn't there ANY way you could
sweep it back? As I mentioned you do not want to have an angle there more
than 45 Deg. I would guess you are at 80 Deg. This is a HUGE amount of
Drag and a HUGE LACK of flow out of the cowl.
Also, as mentioned - The exhaust area of a cowl must be at least twice the
area of the intake - BUT - In your case the intake must also be increased
because of the TURBULENCE and LACK of flow out of the cowl. Now you have
to FORCE more air into the cowl just to overcome the inefficient exhaust
area. This would be more parasitic internal drag. Not what you want, not
for cooling and not for speed - Which is also cooling.
If you can - Sweep the exhaust pipe back so it almost parallels the belly -
Sweep the fixed cowl flap back. IF you can not sweep it back ADD a
backward curve to the exhaust ramp. You want the exhaust ramp facing as
rear as possible. Better a tube than a wall.
Attached are pictures of a rough sketch.
If what Carl has is the same as what others have that is the #1 cause for
high temps.
Barry
On Tue, Jul 24, 2012 at 1:41 PM, Carl Meek <carlmeek@gmail.com> wrote:
> Hi Barry,
>
> Yes, I received the pictures fine. I'm just trying to puzzle out exactly
> where the thing mounts =85.
>
> Attached is a picture of my new "lip"
>
> Regards,
> -Carl.
>
>
> On 24 Jul 2012, at 18:14, FLYaDIVE wrote:
>
> Carl:
>
> Did you receive the email and pictures? Wes, tells me that the pictures
> did not get posted.
>
> Barry
>
> On Mon, Jul 23, 2012 at 3:38 AM, Carl Meek <carlmeek@gmail.com> wrote:
>
>> Barry=85 I'm interested in your concept here, but I can't understand it.
>> Any chance of a photo?
>>
>> I'm currently working on cooling my Jabiru 3300 in the Europa.
>>
>> I've put a 5" lip on the bottom of the cowl exit and this has made a big
>> difference to temperatures in the climb, but it has highlighted uneven
>> cylinder cooling - so my next project is to put some dams to force air
>> between the middle cylinder, and also to route HT leads straight out awa
y
>> from air-flow rather than the bundle of cables blocking it all up.
>>
>> -Carl.
>>
>> On 23 Jul 2012, at 01:21, FLYaDIVE wrote:
>>
>> Jeff:
>>
>> The hard and fast rule for forced air cooling is the EXHAUST area must b
e
>> at least TWICE the size INTAKE area.
>> Another simple little trick in cooling is to create a negative pressure
>> area directly at the ramp exhaust port(s). This can be done with a simp
le
>> piece of aluminum strip 1 1/2 to 2" wide and long enough to span the ram
p
>> area and bent lengthwise down the center-line at a 45 deg angle sort of
>> like this
>> ---> ___/ [But flip it so it angles DOWN] Then rivet it to the edge
>> of the air exhaust ramp. Works great and you will NEVER notice any drag
...
>> Just lower temps.
>>
>> Barry
>>
>>
>> On Fri, Jul 20, 2012 at 2:36 PM, Jeffrey J Paris <
>> jeffrey-j-paris@excite.com> wrote:
>>
>>> Gentlepeople,
>>>
>>> A few months ago someone out on our lists mentioned that they were
>>> using some louvered vents in an aid to cooling their Jabiru installatio
n.
>>> I would be interested to see if anyone has some anecdotal or actual
>>> experience with utilizing louvered vents on the bottom of a cowl in an
>>> effort to aid and imnprove engine cooling.
>>>
>>> In my case I have a Jab3300 powered Zentith Zodiac in which I'm pretty
>>> much dialed into in terms of cooling. However, I am also a builder of
a
>>> Jab 3300 powered Europa Classic Monowheel and due to the fact that the
>>> footwells and the main landing gear truncate the bottom opening of the
cowl
>>> making a clean and big enough exit a bit "messy".
>>>
>>> I am curious to see if a set of vented louvers running parallel and
>>> under each cylinder would create enough pull to enhance cooling? (Bonan
zas
>>> have em') Do the experts think I might have some luck with just such a
n
>>> installation?
>>>
>>> Thanks for your time and consderation.
>>>
>>> Jeff Paris
>>>
>>> *
>>>
>>> ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-
Listtp://forums.matronics.com
>>> _blank">http://www.matronics.com/contribution
>>> *
>>>
>>>
>> *
>>
>> href="http://www.matronics.com/Navigator?JabiruEngine-List">http://www
.matronics.com/Navigator?JabiruEngine-List
>> href="http://forums.matronics.com/">http://forums.matronics.com
>> href="http://www.matronics.com/contribution">http://www.matronics.com/
contribution
>> *
>>
>>
>> *
>>
>> ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-L
isttp://forums.matronics.com
>> _blank">http://www.matronics.com/contribution
>> *
>>
>>
> *
>
> href="http://www.matronics.com/Navigator?JabiruEngine-List">http://www.
matronics.com/Navigator?JabiruEngine-List
> href="http://forums.matronics.com/">http://forums.matronics.com
> href="http://www.matronics.com/contribution">http://www.matronics.com/c
ontribution
> *
>
>
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