Today's Message Index:
----------------------
1. 05:31 AM - Re: Cylinder cooling (Daniel DW)
2. 01:46 PM - Re: Cylinder cooling (N1BZRich@aol.com)
3. 01:52 PM - Just for Grins- follow up (N1BZRich@aol.com)
4. 02:09 PM - Lightning bottom cowl air dam photos (N1BZRich@aol.com)
5. 06:18 PM - Re: Just for Grins- follow up (Jim and Mary Young)
6. 06:52 PM - Re: Lightning bottom cowl air dam photos (JOSEPH MATHIAS LINDA MATHIAS)
7. 10:59 PM - FW: Lightning bottom cowl air dam photos (James, Clive R)
8. 10:59 PM - FW: Cylinder cooling (James, Clive R)
9. 11:52 PM - Re: Lightning bottom cowl air dam photos (Brian Whittingham)
Message 1
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Subject: | Cylinder cooling |
Buz,
a picture of the lip or "air dam" on the Lightning cowl would be nice :-))
Danny
> Date: Thu, 21 Feb 2008 14:09:12 +1100> From: punga-iwi@netspace.net.au> T
o: lightning-list@matronics.com> Subject: Lightning-List: Cylinder cooling>
In a message dated 2/20/2008 8:13:07 P.M. Eastern Standard Time, > allanma
xe@yahoo.com writes:> > I ment cht > > OK, Allen, then here are some though
ts on CHTs:> Remember the key to good cylinder cooling on the jabiru powere
d > Lightning or Esqual is high pressure on top of the cylinders and low >
pressure under them. That makes sure the air flows from top to bottom > thr
ough the cooling fins and thus cools the cylinders. So make sure all > air
coming in through the two nose bowl intakes can only go to the area > above
the cylinders. Close up the area between the nose bowl and the > Jabiru su
pplied fiberglass intake ducts to insure all intake air only > goes into th
e fiberglass ducts. On the bottom cowl, to insure a lower > pressure, the L
ightning cowl has a lip or "air dam" that creates a lower > pressure area i
nside the lower cowl. This also insures the cooling air > moves from top to
bottom. I don't remember if the Esqual bottom cowl > has that or not since
my airplane is total Lightning from firewall > forward. So if the Esqual d
oes not have a lip on the bottom cowl, make > one using fiberglass or even
aluminum. Once both of these things are > done, then you can fine tune the
CHTs for individual cylinders by adding > small "deflectors" inside the fib
erglass ducts over the cylinder than > needs more cooling. Start with these
"eyebrow shaped" deflectors (so > they match up to the concave shape of th
e inside of the ducts) being > about three inches long by 3/8 inch deep. Th
ey trim them down if they > end up blocking too much air to the cylinder be
hind them. On my set up > I have two deflectors on each side over the middl
e and aft cylinders. > This "experimenting" is what home built aircraft is
all about - kind of > trial and error. > I think the hottest cylinder that
I ever see on N31BZ is around 320 > during a climb out on a really hot 100
degree day here in Virginia. By > the time I am climbing through about 3000
feet the temp then starts back > down from the high of 320 or so. Cruise t
emps are all well below 300. > So we know the above will work.> As I mentio
ned in the previous e-mail. You really should attend the > Jabiru engine se
minar. Certainly time and money well spent. You will > not only talk about
this type of thing, but will get to actually see how > the small deflectors
are glued inside the intake ducts. > Blue Skies,> Buz> > > > > -----------
-------------------------------------------------------------> Delicious id
eas to please the pickiest eaters. Watch the video on AOL > Living. > <http
://living.aol.com/video/how-to-please-your-picky-eater/rachel-campos-duffy/
====================> > >
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Message 2
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Subject: | Re: Cylinder cooling |
In a message dated 2/21/2008 8:32:45 A.M. Eastern Standard Time,
ddw55@hotmail.com writes:
a picture of the lip or "air dam" on the Lightning cowl would be nice
Danny,
I have looked through my photo files and can not find one that shows the
Lightning's bottom cowl. May have to take one the next time I remember to
take my camera to the airport.
Sorry,
Buz
**************Ideas to please picky eaters. Watch video on AOL Living.
(http://living.aol.com/video/how-to-please-your-picky-eater/rachel-campos-duffy/
2050827?NCID=aolcmp00300000002598)
Message 3
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Subject: | Just for Grins- follow up |
As a follow up to yesterday's "just for grins" message, it has been
confirmed that the automotive Garmen Street Pilot GPS really does show speeds in
excess of 200 MPH. And no, I did not do this test in a car.
Blue Skies,
Buz
**************Ideas to please picky eaters. Watch video on AOL Living.
(http://living.aol.com/video/how-to-please-your-picky-eater/rachel-campos-duffy/
2050827?NCID=aolcmp00300000002598)
Message 4
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Subject: | Lightning bottom cowl air dam photos |
Danny,
Right after I sent the previous message I remembered where you could see
the lip on the Lightning's bottom cowl. Go to the Lightning news web page
_http://www.arionaircraft.com/News.html_
(http://www.arionaircraft.com/News.html) , and scroll down to near the bottom and look at the photos for 1/5/2006,
Lightning Cowl Finalized, and also 2/15/2005, Wheel and gear fairings set for
trial. Both of these set of photos show the lip or air dam. The idea is
the same as on a car. The air dam forces air down and thus creates a lower
pressure area under the bottom cowl. Hope this helps.
Buz
**************Ideas to please picky eaters. Watch video on AOL Living.
(http://living.aol.com/video/how-to-please-your-picky-eater/rachel-campos-duffy/
2050827?NCID=aolcmp00300000002598)
Message 5
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Subject: | Just for Grins- follow up |
Unfortunately, I fly commercial a lot. I've been able to use my Delorme
Earthmate GPS at altitude. It does register the speed of the airliner and
shows the progress on the map. The last time I flew, the steward asked me
to put it away as they are not allowed. I didn't say anything and politely
put it away assuming it would not do any good to argue that it is a receive
only device and would not interfere with anything.
Jim Young
_____
From: owner-lightning-list-server@matronics.com
[mailto:owner-lightning-list-server@matronics.com] On Behalf Of
N1BZRich@aol.com
Sent: Thursday, February 21, 2008 4:50 PM
Subject: Lightning-List: Just for Grins- follow up
As a follow up to yesterday's "just for grins" message, it has been
confirmed that the automotive Garmen Street Pilot GPS really does show
speeds in excess of 200 MPH. And no, I did not do this test in a car.
Blue Skies,
Buz
_____
Delicious ideas to please the pickiest eaters. Watch the video on AOL
Living.
<http://living.aol.com/video/how-to-please-your-picky-eater/rachel-campos-du
ffy/2050827?NCID=aolcmp00300000002598>
Message 6
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Subject: | Re: Lightning bottom cowl air dam photos |
Danny,
These pictures might give you the idea; I cut the lip off to clear
the exhaust because it was touching and burning the cowl. However,
that raised temps a lot so I had to put a lip back on but moved it about
3/4 inch farther forward. I think you can see the shape of it though
and get the idea.
Linda
----- Original Message -----
From: N1BZRich@aol.com
To: lightning-list@matronics.com
Sent: Thursday, February 21, 2008 5:06 PM
Subject: Lightning-List: Lightning bottom cowl air dam photos
Danny,
Right after I sent the previous message I remembered where you
could see the lip on the Lightning's bottom cowl. Go to the Lightning
news web page http://www.arionaircraft.com/News.html, and scroll down to
near the bottom and look at the photos for 1/5/2006, Lightning Cowl
Finalized, and also 2/15/2005, Wheel and gear fairings set for trial.
Both of these set of photos show the lip or air dam. The idea is the
same as on a car. The air dam forces air down and thus creates a lower
pressure area under the bottom cowl. Hope this helps.
Buz
-------------------------------------------------------------------------
---
Delicious ideas to please the pickiest eaters. Watch the video on
AOL Living.
-------------------------------------------------------------------------
-------
Message 7
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Subject: | Lightning bottom cowl air dam photos |
Apologies I should have carried on reading the next few posts. Though my
comments still apply.
Looking at the pictures of the Lightning ducts and my Esquals the size
difference is massive.
Worth some 'liquid engineering' if there's space.
Regards, Clive
-----Original Message-----
From: owner-lightning-list-server@matronics.com
[mailto:owner-lightning-list-server@matronics.com] On Behalf Of
N1BZRich@aol.com
Sent: 21 February 2008 22:07
Subject: Lightning-List: Lightning bottom cowl air dam photos
Danny,
Right after I sent the previous message I remembered where you could
see the lip on the Lightning's bottom cowl. Go to the Lightning news
web page http://www.arionaircraft.com/News.html, and scroll down to near
the bottom and look at the photos for 1/5/2006, Lightning Cowl
Finalized, and also 2/15/2005, Wheel and gear fairings set for trial.
Both of these set of photos show the lip or air dam. The idea is the
same as on a car. The air dam forces air down and thus creates a lower
pressure area under the bottom cowl. Hope this helps.
Buz
________________________________
Delicious ideas to please the pickiest eaters. Watch the video on AOL
Living.
<http://living.aol.com/video/how-to-please-your-picky-eater/rachel-campo
s-duffy/2050827?NCID=aolcmp00300000002598>
Message 8
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Subject: | Cylinder cooling |
Here's one of Buz's Esqual's LS cowling, a bit grainy but shows the
cowling opening. It looks smaller than the Esqual which also has a lip.
How the actual airflow is affected with each, of course, would need
testing but anecdotal results just show the overall cooling package of
the Esqual is poor. This because the cowling was designed for the
Rotax.
Park my Esqual in a breeze after it's been running and there is plenty
of heat coming out the bottom of the cowl. I think cooling issues with
the Esqual is all around the front opening and the ducts. Just what Pete
and the guys changed with the Lightning cowlings. I think there will be
enough air flow out of the Esqual cowling opening it's just very tight
inside the ducts so that air will be 'choked' so the flow restricted.
One recent suggestion on the engine forum to improve 3300 cooling is to
modify the ducts like the type where the spark plugs and leads are
inside the ducts, this is as later 3300 engine ducts are. Whether we can
do this within the tight confines of the Esqual top cowling I don't
know. Will take a look next time I'm home.
Early 3300 engine in Jabiru's own J series planes also have cooling
issues and the cowlings were subsequently changed more like the
Lightning, though not as good it has to be said.
Regards, Clive
-----Original Message-----
From: owner-lightning-list-server@matronics.com
[mailto:owner-lightning-list-server@matronics.com] On Behalf Of
N1BZRich@aol.com
Sent: 21 February 2008 21:44
Subject: Re: Lightning-List: Cylinder cooling
In a message dated 2/21/2008 8:32:45 A.M. Eastern Standard Time,
ddw55@hotmail.com writes:
a picture of the lip or "air dam" on the Lightning cowl would be
nice
Danny,
I have looked through my photo files and can not find one that shows
the Lightning's bottom cowl. May have to take one the next time I
remember to take my camera to the airport.
Sorry,
Buz
________________________________
Delicious ideas to please the pickiest eaters. Watch the video on AOL
Living.
<http://living.aol.com/video/how-to-please-your-picky-eater/rachel-campo
s-duffy/2050827?NCID=aolcmp00300000002598>
Message 9
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Subject: | Lightning bottom cowl air dam photos |
Clive,
Somewhere around here I have a book that tells about cooling design and
eliminating drag. There's a particular ratio that you want to look for bet
ween entry area and exit area. The "lip" on the Lightning cowling helps to
drop the pressure following it and creates an air pump if you will. It's
giving ram effect cooling. Now if you have too little of an opening for th
e exit the air will tend to build up and spill back out the cowling in fron
t and cause greater cooling drag and less efficiency. If you have too smal
l of an opening in the front for the size of the rear, then you have air pu
lling through the openings like it should, but not enough quantity to poten
tially be inadequate. What I would like to see is somebody take it upon th
eir selves, maybe with a background in engineering, and modify their cowlin
g such as this:
http://www.airliners.net/photo/Untitled/Lancair-Legacy-2000/0454138/L/
Also see a better view of the bottom of the cowl here:
http://www.airliners.net/photo/Untitled/Lancair-Legacy-2000/0647171/L/
The first pic is most applicable. In this case, the air exits via two outl
ets which shroud the exaust. These protrude into the airstream a little an
d cause a partial pressure drop. The big drop in pressure comes from the e
ntry/exit sizes though. The air from the cowling exits around the exhaust
stacks. The nosegear strut is faired in and glassed to the bottom of the p
lane. Sure, some of you are going to say, well what about temperature arou
nd those exhausts. Temperature will make that pressure drop less than it c
ould if it were cool air and a dedicated duct. Well, the effects of temp o
n pressure decrease as the mass flow increases, to the point to where it ha
s virtually no impact if you design the cowl right.
Having said all of that. The Lightning cowl is very efficient at cooling.
It was designed with the entry/exit area in mind. Pete has commented befo
re that if they were to focus on any kind of drag reduction in the future,
the cowl would be one of those. It's great at cooling, pretty good in drag
, but could be a little better. If some of you engineer types had the know
how to modify and do a little testing and present the findings to Arion, i
f they were favorable to the point of being worthwhile, then you might get
a little chance to help make a great design even better!
>From the flight testing that I did, it is possible to get a little higher s
peeds out of the Lightning with simple drag reduction, but you're close to
Vne as it is. My focus would be on improving drag and instead of cruising
faster, being able to pull the throttle back a little more at high altitude
cruise. I think that Earl emailed me that he got 0.2-0.3 gph better fuel
burn with his gap seals. It doesn't sound like a lot but if you can get 0.
3 here and 0.2 there, then it would be possible to get 4 something gph in c
ruise in a Lightning and save 10% on fuel costs per year. If you fly 100 h
ours a year, if gas was $3.50/gallon, it amounts to an additional $175 on f
uel. The bigger savings may come in the long run though as you will likely
be running cooler and therefore improving the overall life and maintenance
cost of the engine. Just a few thoughts. Anybody else have any ideas on
the matter. Brian W.
___________________________________________________________
> Subject: FW: Lightning-List: Lightning bottom cowl air dam photos> Date:
Fri, 22 Feb 2008 06:55:55 +0000> From: clive.james@uk.bp.com> To: lightning
-list@matronics.com> > Apologies I should have carried on reading the next
few posts. Though my> comments still apply. > > Looking at the pictures of
the Lightning ducts and my Esquals the size> difference is massive.> > Wort
h some 'liquid engineering' if there's space.> > Regards, Clive> > -----Ori
ginal Message-----> From: owner-lightning-list-server@matronics.com> [mailt
o:owner-lightning-list-server@matronics.com] On Behalf Of> N1BZRich@aol.com
> Sent: 21 February 2008 22:07> To: lightning-list@matronics.com> Subject:
Lightning-List: Lightning bottom cowl air dam photos> > Danny,> Right after
I sent the previous message I remembered where you could> see the lip on t
he Lightning's bottom cowl. Go to the Lightning news> web page http://www.a
rionaircraft.com/News.html, and scroll down to near> the bottom and look at
the photos for 1/5/2006, Lightning Cowl> Finalized, and also 2/15/2005, Wh
eel and gear fairings set for trial.> Both of these set of photos show the
lip or air dam. The idea is the> same as on a car. The air dam forces air d
own and thus creates a lower> pressure area under the bottom cowl. Hope thi
s helps.> Buz> > > > ________________________________> > Delicious ideas to
please the pickiest eaters. Watch the video on AOL> Living.> <http://livin
g.aol.com/video/how-to-please-your-picky-eater/rachel-campo> s-duffy/205082
7?NCID=aolcmp00300000002598>
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