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601XL Jab3300 cooling

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n787xl(at)aol.com
Guest

Posted: Wed Oct 17, 2007 7:45 am Post subject: 601XL Jab3300 cooling

List

 

 On Oct 13th at the Zenith fly in at Cloverdale, 3 of the  601xl's /Jab3300 equiped planes had an exterior air scoop on the 2, 4, & 6 side!

 

 Comments??

 

 JES

 601XL/JAB3300

 70% complete.

 

   

 

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Tim Juhl

Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan

Posted: Wed Oct 17, 2007 8:03 am Post subject: Re: 601XL Jab3300 cooling

Are you sure you weren't looking at the carb air scoop?  If they have the new Jab cowling then the big scoop under the prop (where the carb air intake is on most planes) is for the oil cooler.   



If it is for cooling, then please post a picture if you have one.



Tim

_________________
______________
CFII
Champ L16A flying
Zodiac XL - Jabiru 3300A
Almost done! It'll fly in spring!

craig(at)craigandjean.com
Guest

Posted: Wed Oct 17, 2007 8:04 am Post subject: 601XL Jab3300 cooling

>  On Oct 13th at the Zenith  fly in at Cloverdale, 3 of the  601xl's /Jab3300 equiped planes had an  exterior air scoop on the 2, 4, & 6 side! 

  

 Two of the three were N601FW (Alan & Nathalie Smith)  and N601WF (Stephen Smith). The reasoning is that the vents on the cowl (from  Jabiru Pacific) slope back. On the side where the prop blade swings up the air  bypasses the vent. So the eyebrow vent keeps the air from bypassing the vent. I  don't remember what improvement was seen.

  

 You  can read about building the twin planes in 4 months here:

  

 http://www.qualitysportplanes.com/qsp-2006_072.htm

  

 --  Craig

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Tim Juhl

Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan

Posted: Wed Oct 17, 2007 8:15 am Post subject: Re: 601XL Jab3300 cooling

I see what you mean...... seems like there are some serious design issues with that cowling.   The pix of the  latest from JabiruUSA is attached.  I hope it works a little better.

Tim

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Newer style XL cowling from JairuUSA

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_________________
______________
CFII
Champ L16A flying
Zodiac XL - Jabiru 3300A
Almost done! It'll fly in spring!

amyvega2005(at)earthlink.
Guest

Posted: Wed Oct 17, 2007 8:37 am Post subject: 601XL Jab3300 cooling

Craig and fellow dudes,

The eyebrow you see on those planes is typ;ically for only the break in period.  The Tennessee Cowling which i have seen installed on one 601 has its own set of issues.  the key is push as much air through the top of the cylinder cooling fins. the # 5 cylindar of the Jab 3300 has cooling issues on either one, the key is to tackle the cooling issues"within reason"  what I mean is that so long as my CHT on the rear heads don't go above 345 and egt over 1340 at cruise , i can live with it.  the key is to get over 70 hourds then reassess.  One thing I did see is the tennesee fitting on the Kit was a little better however you have to do a lot more glassing work, and the air ducts are a work in proces.  

Juan 



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mosquito56

Joined: 24 Aug 2007
Posts: 77
Location: Laredo, Tx

Posted: Wed Oct 17, 2007 10:00 am Post subject: Re: 601XL Jab3300 cooling

I see alot of discussion concerning the cooling issues with the Jab3300. Is this a "Plane to hot to fly issue" or a "I want to cruise faster issue"?

  I am planning on ordering the Jab soon, however,  I live in a very hot area and over 105 temps during the summer is normal. Will I be able to fly the jab here in my 601, or will I just have to slow down a little during hot periods?

Don

_________________
Don Merritt- Laredo, Tx
.

psm(at)ATT.NET
Guest

Posted: Wed Oct 17, 2007 10:19 am Post subject: 601XL Jab3300 cooling

Hi Don,



I'm not exactly sure what your question is.



As I understand it, the Jabiru 3300 works fine on the 601XL.  It is 

the highest power engine commonly used on this design.  I don't have 

personal experience yet, but the cooling should be fine on the 

XL.  There have been some posts about using this engine on the 701, 

but I think most people agree this is too much engine for that airframe.



The performance difference you can expect from the Jabiru depends on 

what engine you compare it to.  It has lots more horsepower than any 

of the other engines usually used on the XL.  That could translate to 

higher cruise speed, but it is more likely to show up in climb rate.



I will start installing my Jabiru in my XL pretty soon.



Paul

XL fuselage

At 11:00 AM 10/17/2007, you wrote:

 	  Quote: 	
		  



I see alot of discussion concerning the cooling issues with the 

Jab3300. Is this a "Plane to hot to fly issue" or a "I want to 

cruise faster issue"?

   I am planning on ordering the Jab soon, however,  I live in a 

 very hot area and over 105 temps during the summer is normal. Will 

 I be able to fly the jab here in my 601, or will I just have to 

 slow down a little during hot periods?

Don



--------

Don Merritt

aspen1150(at)yahoo.com
Guest

Posted: Wed Oct 17, 2007 11:04 am Post subject: 601XL Jab3300 cooling

I'm in an area where the summer temps are over a hundred degrees also,  the Jab 3300 cools just fine in my 601 XL during these hot times.



mosquito56 <mosquito-56(at)hotmail.com> wrote:  [quote]--> Zenith-List message posted by: "mosquito56" 



I see alot of discussion concerning the cooling issues with the Jab3300. Is this a "Plane to hot to fly issue" or a "I want to cruise faster issue"?

I am planning on ordering the Jab soon, however, I live in a very hot area and over 105 temps during the summer is normal. Will I be able to fly the jab here in my 601, or will I just have to slow down a little during hot periods?

Don



--------

Don Merritt

KLRD

Rans S-12 Flying not built

Zodiac 601xl-Middle Fuse -Jab3300 on order





Read this topic online [quote][b]

n282rs(at)satx.rr.com
Guest

Posted: Wed Oct 17, 2007 11:12 am Post subject: 601XL Jab3300 cooling

Don



A Jabiru will work fine. Most peoples cooling issues occur during break in. Usually while you figure out where to put the deflectors in the baffles.  It would be easier to do your break in during the cooler months. 



I don't know if I would want to do my first few test flights at Laredo International. I can see you getting extended downwind instructions while the CHT's go over the top. 



As far as 105 degree temps, you probably won't want to be inside a Zodiac then, no matter what engine you have. The sweat will be pouring down your face so fast, you won't be able to see where you are going. 



Randy Stout

San Antonio TX

www.geocities.com/n282rs

n282rs (at) satx.rr.com

--

amyvega2005(at)earthlink.
Guest

Posted: Wed Oct 17, 2007 1:53 pm Post subject: 601XL Jab3300 cooling

here in florida its hitting 95 when i fly.  the faster the plane flys the better, you want to stuff as much air through  the cowling, so i am flying at 2950 rpm at 120 to 130 mph.



Juan



--

mosquito56

Joined: 24 Aug 2007
Posts: 77
Location: Laredo, Tx

Posted: Wed Oct 17, 2007 2:23 pm Post subject: Re: 601XL Jab3300 cooling

I guess most of the issues have been cleared up by the newer versions of the engine. I was reading about experimental experimental engines (Jabiru was not used much, I had only seen one in my life) when I first bought my Rans S-12. As I read the Rans Page, I would goto the Jab just to browse and I was always reading about overheating problems.

   Makes me feel a little better since I plan to order my Jab in the next few days.

Don

_________________
Don Merritt- Laredo, Tx
.

japhillipsga(at)aol.com
Guest

Posted: Thu Oct 18, 2007 8:16 am Post subject: 601XL Jab3300 cooling

Ed, don't fly slower, just fly higher, Bill

 

 

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