lvuman(at)gmail.com
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 Posted: Sat Aug 23, 2008 10:42 am Post subject: CH-701 + Jabiru 3300 - why is zenusa & zencan different |
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This might be a good time to jump in here as there seems to be a lot of discussion as to whether the Jabiru 3300 is an adequate engine for the 701.
I have the first or close to the first 701 with a Jabiru 3300. It was the prototype plane used by Pete at JabiruUSA to fit a firewall forward package using the 701. A proven 601 cowling was modified for the purpose and more recently was modified again to address cooling issues. Although the original cowling worked well at temperatures at 75 degrees or less, cooling issues, specifically CHT's, were too high while climbing for any length of time. I finally modified the cowling and the cooling ducts to allow 40% more inlet air and opened the bottom of the cowling to allow the correct differential pressure. The modification worked wonderfully. I no longer have any cooling issues although I haven't flown "Buzz" in temps greater than 95 degrees. I believe Pete at JabiruUSA has since modified his firewall forward package to change his cowling and inlet ducts to approximate my installation. Should be great.
I tried several different propellers (thanks to the helpful staff at JabUSA) and have found the correct combination for me. In this process, Pete sent me a 68" prop which I loved but it was tested with the original cowling and the temps were even slightly higher due to flatness of the blades close the inlet openings. Would be fun to try it now with the improved cowling but am very satisfied with my 64" prop.
The performance has been very acceptable, however it's hard to judge the difference in a Rotax powered 701 as my aircraft has been modified with PegaStol wings (retractable slats), extended gear, etc., making it slightly heavy although the wing installation increased my gross weight to 1,200lbs. It does get off very quickly and climbs with two people at about 1,000' per minute. Works for me.
I really like the Jab engine. I had a 701 with a Jab 2200 and knew the next project would be another Jab. They start smoothly and easily, and most of all, hardly any vibration in cruise. I cruise at about 85 with less than 4 gallons per/hour at about 2500rpm but can push it up to 100 easily if I want to pay for the gas. With the new hydraulic lifters, there is very little maintenance, single carb (which is a big plus), and easy to do maintenance if needed.
I have about 65 hours on Buzz so far. I removed the wings and stored it in my garage while I went to Alaska and Colorado for the summer. I plan to put the wings back on shortly and hopefully, fly it to the Copperstate
Fly-in in Arizona the first part of October.
Hope this answers a few of the questions. For those of you interested, I have a few pictures posted at:
http://www.flickr.com/photos/22918119(at)N08/
On Sat, Aug 23, 2008 at 10:01 AM, Donald Koehnlein <mustangg40(at)yahoo.com (mustangg40(at)yahoo.com)> wrote:
[quote] --> Zenith701801-List message posted by: Donald Koehnlein <mustangg40(at)yahoo.com (mustangg40(at)yahoo.com)>
I spoke to a builder in AZ that has built 2 701's one
with the Jab 3300 w/ pegstol wings and one with the
Rotax 912. His advise to me in his retrospect that
there wasn't that much extra benefit cost, maintenance
and flying characteristics with the Jab 3300. He
recommended the Rotax 912.
I also spoke to a Rotax mechanic in Tucson who fly's
behind a 912 in a Flight Design CT. His experience on
the 912 is that they are very reliable and have little
maintenace as long as you change the plugs and oil at
regular intervals. I'm from Missouri so he could be a
little bias but he does fly behind a 912.
Don Koehnlein
Prospective builder
701/750
--- flicka750 <flicka750(at)gmail.com (flicka750(at)gmail.com)> wrote:
> --> Zenith701801-List message posted by: "flicka750"
> <flicka750(at)gmail.com (flicka750(at)gmail.com)>
>
> The ZenUSA doesn't even say JAB-3300 is a 'choice',
> the ZenCAN says JAB is a choice. The USA site
> appears to suggest that JAB is "Engine non grata'.
>
> A 'choice' infers that it works.
>
> I have seen the 'homebuilt alt' engine dvd's so
> what. I change the subject and not just answer the
> question?
>
> 1.) Why is does one site mention the Jab3300 and the
> other not?
>
> 2.) Is the ZenCan 701(QB) different or NOT? I don't
> think it is, thus if its the same plane, and if the
> 'choice' in Canada leads to a safe airplane, then
> why would that not be true in the USA?
>
> Regarding the 'homebuilt alt' dvd's, they're all
> marketing & PR sales video-lit provided by each
> manufacturer. Hardly unbiased. I come here to hear
> from those at the end of the food chain to see how
> they work in the field. I don't think that vendors
> who are at the beginning of the food chain are
> credible. I have never say the guys at 'homebuilt
> dvd' say anything bad about anything, the love
> everyone; why not, everyone promote's their dvd's.
>
> The entire homebuilt kit plane biz is about 'xxx
> airforce' marketing, where everyone promotes all the
> products. The problem is getting credible non-biased
> end user information.
>
> The current EAA mag I get monthly talks about
> building a plane for less than $20k, yet the average
> is now around $60k. Reading the site at SONEX tells
> me they really know whats going on. Homebuilt planes
> aren't for little guys in shop anymore its a big
> buck game now where people are now spending on
> average more for a 'kit plane' than if they just
> bought a new plane.
>
> I'm glad that Matronics has this board, I'm glad
> there is at least one board in the EAA homebuilt
> world that isn't censored and controlled by vendors.
> We really need to have solid answers to questions,
> and not just base decision on emotions and feelings.
>
> [quote="Joemotis(at)aol.com"]In a message dated
> 8/22/2008 9:06:08 A.M. Pacific Daylight Time,
> flicka401(at)gmail.com (flicka401(at)gmail.com) writes:
>
> > Anybody have any ideas? I know that two
> different brothers are running two different
> company's, and
>
>
> The Fsat-Build Kit is supplied "firewall-back" to
> allow for easy installation of your choice of
> engine, including Rotax 912S,Jabiru 3300,
> Continental O-200 and more.
>
> "Your choice of engine" is not a recommendation.
>
> It's only a deal if it's where you want to go. Find
> your travel deal here
>
(http://information.travel.aol.com/deals?ncid=aoltrv00050000000047).
>
> >
>
>
> [quote="Joemotis(at)aol.com"]In a message dated
> 8/22/2008 9:06:08 A.M. Pacific Daylight Time,
> flicka750 writes:
>
> > Anybody have any ideas? I know that two
> different brothers are running two different
> company's, and
>
>
> The Fsat-Build Kit is supplied "firewall-back" to
> allow for easy installation of your choice of
> engine, including Rotax 912S,Jabiru 3300,
> Continental O-200 and more.
>
> "Your choice of engine" is not a recommendation.
>
>
>
> It's only a deal if it's where you want to go. Find
> your travel deal [b]here
>
(http://information.travel.aol.com/deals?ncid=aoltrv00050000000047).
>
> > [b]
>
>
> --------
> flicka750(AT)gmail
> "Common sense is the accumulated prejudices
> before the age of 18" Einstein
>
>
>
>
> Read this topic online here:
>
>
http://forums.matronics.com/viewtopic.php?p=200077#200077
>
>
>
>
>
>
>
>
> browse
> Un/Subscription,
> FAQ,
> http://www.matronics.com/Navigator?Zenith701801-List
>
> Forums!
>
> Admin.
>
>
>
>
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