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Michel
Joined: 10 Jan 2006
Posts: 966
Location: Norway
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 Posted: Fri Jan 11, 2008 1:09 pm Post subject: Jabiru. WAS: LOW power limits |
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On Jan 11, 2008, at 8:52 PM, Noel Loveys wrote:
| Quote: | What I question about the Jab is the 3300 rpm... That requires a very
short
prop to keep the inertial stresses down. That means that full power
for
takeoff isn't either developed or efficient. What i like about it is
of
course the fact you can leave the redrive at the shop 
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I have a Jabiru 60 by 38" two-blades fixed pitch wood prop, Noel. I
don't know if that is short or not; I don't know much about these
things. From what I understand, I have less torque for take-off. But it
is not my concern; I fly from a long asphalt runway. As you probably
know, I went from a Rotax 582 to the Jabiru. My decision was based on
the reliability and long TBO of a four-strokes engine; plus the light
weight and simplicity of a air-cooled and direct drive engine.
Take-off performance is about the same as the 582. At cruise attitude,
I need less power to keep 85 MPH, my cruise speed with the model 3. I
burn a bit less fuel and it is a quiet and smooth ride. Last, the
Jabiru 2200 is only slightly heavier than the 582 and, in order to keep
my CoG at the same place, I only had to move the battery from the
firewall to behind the seat.
The negative sides of the Jabiru are:
- Limited propeller choice.
- Needs a new cowling to accommodate for the boxer type engine.
Otherwise, I am quite pleased with it and I think that Lynn is too.
Cheers,
Michel Verheughe
Norway
Kitfox 3 - Jabiru 2200
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Kitfox 3 - Jabiru 2200 |
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Fri Jan 11, 2008 1:43 pm Post subject: Jabiru. WAS: LOW power limits |
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Absolutely, Michel and Noel. I'm not sure what short is, but I gather
my 62" (x46") is shorter by comparison to the 72-inchers, or whatever
the redrive crowd uses. But then, my engine got me across the country
last year at a pretty economical rate, I didn't lose a drop of
coolant, and didn't have to listen to, and worry about, a tach
reading of 5000+ rpm. In my case, a Sport Pilot, I can't fly with an
in-flight-adjustable prop anyway, so my prop choices are not that
limited. I just can't use a ground adjustable at the present time,
according to Jabiru, unless that's changed recently. My plane gets
off the ground in about 250 feet the last time I cared to check,
sometimes less. I usually fly alone, can kick the butts of the
spamcans that are foolish enough to try to outclimb me, but I'm
realistic enough to know that the screaming Rotax's would probably
outclimb me, so why get into that. It's all about what you want to do
with the plane, how you want to fly, and how you want the engine to
sound. I can't count the times I've heard "At least your plane
SOUNDS like a real plane."
Lynn Matteson
Grass Lake, Michigan
Kitfox IV Speedster w/Jabiru 2200
flying w/450+ hrs
On Jan 11, 2008, at 3:58 PM, Michel Verheughe wrote:
| Quote: |
On Jan 11, 2008, at 8:52 PM, Noel Loveys wrote:
> What I question about the Jab is the 3300 rpm... That requires a
> very short
> prop to keep the inertial stresses down. That means that full
> power for
> takeoff isn't either developed or efficient. What i like about it
> is of
> course the fact you can leave the redrive at the shop
I have a Jabiru 60 by 38" two-blades fixed pitch wood prop, Noel. I
don't know if that is short or not; I don't know much about these
things. From what I understand, I have less torque for take-off.
But it is not my concern; I fly from a long asphalt runway. As you
probably know, I went from a Rotax 582 to the Jabiru. My decision
was based on the reliability and long TBO of a four-strokes engine;
plus the light weight and simplicity of a air-cooled and direct
drive engine.
Take-off performance is about the same as the 582. At cruise
attitude, I need less power to keep 85 MPH, my cruise speed with
the model 3. I burn a bit less fuel and it is a quiet and smooth
ride. Last, the Jabiru 2200 is only slightly heavier than the 582
and, in order to keep my CoG at the same place, I only had to move
the battery from the firewall to behind the seat.
The negative sides of the Jabiru are:
- Limited propeller choice.
- Needs a new cowling to accommodate for the boxer type engine.
Otherwise, I am quite pleased with it and I think that Lynn is too.
Cheers,
Michel Verheughe
Norway
Kitfox 3 - Jabiru 2200
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Lynn
Kitfox IV-Jabiru 2200
N369LM |
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dave
Joined: 22 Sep 2006
Posts: 1382
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Fri Jan 11, 2008 8:06 pm Post subject: Jabiru. WAS: LOW power limits |
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Lynn do you take your jab all the way up to 3300??? That's screaming for a
direct drive!
Noel
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Sat Jan 12, 2008 4:46 am Post subject: Jabiru. WAS: LOW power limits |
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Nope...I've only seen 3300 once when I did a low pass under power at
a friend's airstrip. My 62 x 46 will only get me about 3150 under
most conditions, but usually I see about 3000 max straight and level.
Jab says 2750-2950 is the cruise range. Like I've said here before, I
think I'm over-propped, but that's what was engineered for me by the
Jabiru dealer/Sensenich, and I'm pretty happy with the way it works,
so no changes are in my immediate future.
Lynn Matteson
Grass Lake, Michigan
Kitfox IV Speedster w/Jabiru 2200
flying w/450+ hrs
On Jan 11, 2008, at 11:05 PM, Noel Loveys wrote:
[quote]
Lynn do you take your jab all the way up to 3300??? That's
screaming for a
direct drive!
Noel
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Lynn
Kitfox IV-Jabiru 2200
N369LM |
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dave
Joined: 22 Sep 2006
Posts: 1382
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| Posted: Sat Jan 12, 2008 8:07 am Post subject: Re: Jabiru. WAS: LOW power limits |
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Have you guys seen the Tony spicer video?
He flying a Sonex 3300 (at) 198 mph down the runway.
I for get the rpm.
I have a copy of it here somewhere, maybe I could upload ?
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Realtime Kitfox movies to separate the internet chatter from the truth
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Sat Jan 12, 2008 12:06 pm Post subject: Jabiru. WAS: LOW power limits |
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I'd like to see Jab go back and redesign the crank for a max of 2900 rpm.
That would allow a bit longer more efficient prop. Problem is they would
probably also have to increase displacement to maintain hp. Increasing
displacement means burning more fuel and dissipating more heat, dissipating
more heat... What to H... lets strap a high by pass turbine on to it and
call it an F-022 (F for fun) and have a big tanker follow us
everywhere!
The above written with tongue firmly planted in cheek.
Noel Loveys
AME Intern, RPP
Kitfox III-A, 582,B box
Ivo IFA, Aerocet 1100 floats
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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