Today's Message Index:
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1. 06:56 AM - Re: Engine thru bolts and? (Tim Juhl)
2. 08:07 AM - Re: Re: Engine thru bolts and? (Paul Mulwitz)
3. 08:32 AM - Re: Engine thru bolts and? (Tim Juhl)
Message 1
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| Subject: | Re: Engine thru bolts and? |
Paul,
Good to hear from you. I hate to admit it, but life got in the way and I took
almost a year off from building. I'm back at it now, working every day, but haven't
kept up with the latest scuttlebutt.
I've read of some issues developing with the Jabiru but am not surprised.... nothing
like having a bunch out there being used and abused to show where the potential
issues are. I'm not going to panic but I am looking to see if there is
anything I should do before I hang it to save myself hassle later on.
I suspect that a lot of the problems being reported are heat related, something
I plan to monitor very closely and try to deal with during my flight testing.
Based upon your experience do you have any suggestions for me?
Tim
--------
______________
CFII
Champ L16A flying
Zodiac XL - Jabiru 3300A
Wing modifications done - back working on the fuselage
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=395813#395813
Message 2
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| Subject: | Re: Engine thru bolts and? |
Hi Tim,
As far as I know you are already on the right page. I had lots of heat
issues to resolve on my plane. That dominated the first 10 hours of
flight testing. I never let the engine get too hot. After using full
power for takeoff and climb to 500 AGL I reduced power to keep CHTs
below the max (using Dynon EMS). Fortunately, the 3300 is a lot of
engine for this little airplane and operating at low RPM is still plenty
to maintain flight. Now I use full throttle for any extended climb as
recommended. This makes a somewhat richer mixture than high cruise power.
I don't know for a fact, but I suspect many of the problems experienced
by Jabiru owners are related to overheating the engine. Once you let it
get too hot the aluminum starts to soften.
Good luck,
Paul
On 3/7/2013 6:55 AM, Tim Juhl wrote:
>
> Paul,
> Good to hear from you. I hate to admit it, but life got in the way and I took
almost a year off from building. I'm back at it now, working every day, but
haven't kept up with the latest scuttlebutt.
>
> I've read of some issues developing with the Jabiru but am not surprised....
nothing like having a bunch out there being used and abused to show where the
potential issues are. I'm not going to panic but I am looking to see if there
is anything I should do before I hang it to save myself hassle later on.
>
> I suspect that a lot of the problems being reported are heat related, something
I plan to monitor very closely and try to deal with during my flight testing.
>
> Based upon your experience do you have any suggestions for me?
>
> Tim
>
> --------
> ______________
> CFII
> Champ L16A flying
> Zodiac XL - Jabiru 3300A
> Wing modifications done - back working on the fuselage
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=395813#395813
>
>
Message 3
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| Subject: | Re: Engine thru bolts and? |
Paul,
The heat issue has plagued the Jabiru from the beginning. When I attended classes
at Shelbyville they spent some time discussing how to best deal with it.
I agree with you that careful engine management might pay big dividends.
The hottest running engine I've ever dealt with was the Continental O-470 in my
1975 C182. To keep CHT's in line it was necessary to either open the cowl flaps,
enrich the mixture, reduce power or increase airspeed (in climb). Usually
a combination of things. The XL lacks cowl flaps and adjustable mixture so
you are pretty much left with the latter two and as you point out, the Jab has
enough surplus power to make that feasible.
I did finally get a chance to fly in an XL, thanks to Dr. Ed Moody in Rayne, LA.
We stopped in on the way home from visiting our kids in OK and TX over Xmas/New
Year's 2011/2012. The XL climbed out like a "Homesick Angel" and obviously
had power to spare.
Thanks again!
Tim
--------
______________
CFII
Champ L16A flying
Zodiac XL - Jabiru 3300A
Wing modifications done - back working on the fuselage
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=395828#395828
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