challgren(at)mac.com
Guest
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 Posted: Sat Oct 13, 2007 8:54 am Post subject: CH701 Firewall Forward Kit |
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On Apr 9, 2007, at 2:11 PM, Pete Krotje wrote:
| Quote: | Jabiru USA Sport Aircraft announces the release of a complete firewall
forward installation kit for the CH701. Kit includes cowls, mount,
all
systems, prop and spinner.
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Pete:
I had a Jabiru 3300 (Serial #33A67) on our Zenith 601 HDS and you
were very helpful as we were ironing out our various cooling and fuel
burn problems. We were very pleased with the 3300 and it is my
first choice for the 701 I am building now.
I notice that the pictures in your April 9 Email have been replaced
by "CH 701 Series, Coming soon". I am wondering what progress has
been made on the Jab 3300 for the Zenith 701?
I am at that point in the 701 building process where the Jon's 701
video and Zenair's graphic instructions suggest I put the engine
mount on. Before I order the engine mount I need to make an engine
choice, Jabiru 3300 or Rotax 912S.
I have previously queried the Zenith list last December on these two
choices and received one thoughtful and disquieting responses which I
quote below in part:
"Hi Stan, I spent an hour on the phone with Jabiru and talked to a
owner there. The discussion was to confirm my personal feelings of
the Jab 3300 in a 701. Funny enough the owner holds the same belief
and concerns that I share. The Jab is a great engine and I have
absolutely no problems with it in a 601XL. But your 701 is a
different story.
Jabiru USA is trying to build a FWF for the 701 right now and they
are having major problems. The new arrangement of the hydraulic heads
means that the engine must be lowered yet again. What does this mean?
It means that you will have to swing an even smaller prop then before
and the 701 truly needs a large prop for its airframe.
SO some of the negatives involved in choosing a 3300
· Engine is truly to heavy
· FWF is not available yet
· Direct drive means a smaller less efficient prop for the
701 design, wich benefits greatly from a large prop.
· Too much power for the airframe
· Prop placement is below the longerons and throws off the
proper placement, handeling may be affected, Jabiru is unsure of this
at the moment.
· Engine is too wide and makes the nose look funny.
· Cooling is going to be an issue even with the new FWF
(possibly)
· Nose of your plane is longer, possible C or G issues and
weight added to tail.
· Uses more gas then the Rotax for comparable speeds.
· Single carb, not as efficient as dual at attitude.
· So truly with the smaller prop, even though the Jabiru 3300
has a better power to weight ratio then the Rotax 912S, it will have
less power over all in your 701 and burn a lot more fuel.
· There is not a very big difference in cost between the
Jabiru 3300 and the Rotax 912S after you add the price of the FWF to
either engine package.
· The Jabiru 3300 is all air- cooled in it’s right it has
many benefits but the liquid cooled heads on a plane in Canada is a
lot less prone to cooling shock on approach especially if you are
flying in Altitudes.
Don’t get me wrong, I really love the Jabiru 3300, I’m not crazy
about the 2200 and in a 601 XL I would do my best to help any builder
consider the Jab over the Rotax in a flash. But hands down the Rotax
is truly the best fit in my opinion for the 701."
Notwithstanding the quotes above, I favor the Jab 3300 because of the
superior service you provided us even though we had purchased the
engine from the unsatisfactory dealer in California. Also, the
3300's beauty, reliability and lack of problems in service is far
superior to the 912S.
So, the bottom line. Is the 701 compatible with the 3300 and, if so,
what is the expected date of the firewall forward package?
Stan Challgren
N701VG (reserved)
303-674-6910
24754 Chris Drive
Evergreen, Co 80439
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