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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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 Posted: Wed Jul 16, 2008 7:01 pm Post subject: kolb sighting/Jabiru Powered MKIII |
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| Quote: | I haven't flown a mk-3 with a 912 on it so I can't give you an opinion.But the jabiru is a simpler install,air cooled, a tough and dependable unit.The only draw back is prop speed and the noise that it produces.When you spin a prop at 3100 behind a Kolb it really gets your attention.
G Aman,
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Gary:
I don't think Rick Neilsen had either, not until I took him flying out of Goulding's, Monument Valley, UT. Rick was quite surprised when we blasted out of the 5,190 ft MSL airstrip.
There is a lot of difference flying a Kolb with a direct drive and a redrive engine. In the early days, John Williamson had a Jabiru direct drive on his Kolbra. My 912ULS powered MKIII would eat him up in take off, climb and cruise was about the same, once John W got the Kolbra up to altitude and speed.
Think it was May 2005, I met John W at Canon City, CO. We departed the next morning for Leadville, CO, highest airport in the North American Continent. John W took off and left me in his dust, take off, climb, and cruise. Amazing what the 912ULS did for the Kolbra. The greatest improvement in the Kolbra performance was going from a short two blade high rpm prop to a big three blade slow turning prop.
The 912 series engines are also simple to install. The coolant radiator has never been a problem since I hung the first one on a Kolb. A direct drive engine will never perform on the same level as a redrive engine on a MKIII or any other model Kolb.
Short, high rpm, two blade props can not compete with slower turning long two and three blade props. Just the way it works out.
Rick Neilsen started out with a direct drive VW, then went to a redrive. Ask Rick how much difference in performance the redrive made.
john h
mkIII
[quote] [b]
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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gaman(at)att.net
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| Posted: Thu Jul 17, 2008 5:15 am Post subject: kolb sighting/Jabiru Powered MKIII |
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John,
I agree.I guess what we need on our MK-3s is a100hp radial that spins1800rpm and weighs 130# I really like the Jabiru,it's smooth and easy on fuel, less than 3 gph at 2750.It doesn't leak oil .It's a VW with an Australian accent.
G Aman,hearing impaired,but happy.
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NeilsenRM(at)comcast.net
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| Posted: Thu Jul 17, 2008 5:23 am Post subject: kolb sighting/Jabiru Powered MKIII |
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John/Gary
I have flown a 80 HP 912 a number of times at old Kolb and New Kolb. It is surprising the improvement 25% more power from a 912ULS gives a MKIIIC .
The Jabiru is a great engine but isn't a great match for Kolb aircraft. The engine when compared to my direct drive VW is 20-30 lbs. lighter produces 5 more HP at 200-300 less RPM. This is all great and with the perfect prop does a acceptable job but. When I put a redrive on my VW I got almost twice the thrust from the same engine turning the same RPMs. Even with all the on paper advantages of the Jabiru, it just can't match the thrust of a 80 HP redrive engine and it is thrust that is important. The 100 HP 912 really puts it and my VW to shame. Now if they would cut the cost of the a 912 by $10,000-12,000....
Rick Neilsen
Redrive VW powered MKIIIC
[quote] ---
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Ricochet
Joined: 29 May 2008
Posts: 36
Location: Fresno, CA
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| Posted: Thu Jul 17, 2008 7:27 am Post subject: kolb sighting/Jabiru Powered MKIII |
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and then, John and Gary, I hung a 3300 Jab on the back of my Titan. It weighs about 15 lb more than a 912, costs about the same (or did) and climb went at sea level as predicted, from 1400 to 2000 fpm. I think it might have stayed with a 912 Kolb, and it always got everyone's attention from its incredible climb angle, including during my bi-annuals. Still, a little noisy.
Jerry--also hearing challenged--not impaired, Gary 
On Jul 17, 2008, at 6:12 AM, gary aman wrote:
[quote]John,
I agree.I guess what we need on our MK-3s is a100hp radial that spins1800rpm and weighs 130# I really like the Jabiru,it's smooth and easy on fuel, less than 3 gph at 2750.It doesn't leak oil .It's a VW with an Australian accent.
G Aman,hearing impaired,but happy.
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NeilsenRM(at)comcast.net
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| Posted: Thu Jul 17, 2008 8:51 am Post subject: kolb sighting/Jabiru Powered MKIII |
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Jerry
With 120 HP you should get super performance. On the Jab web site they list the fuel consumption at 4 GPH for the 4 cyl. and 6.8 GPH on the 6 cyl. (at) 75 %. With that much power you can get a bunch of thrust even if it isn't very efficient. My direct drive VW would wake the dead when I wound my 60" prop up to 3600 RPM. That noise you hear is HP being turned into something other than thrust.
Rick Neilsen
Redrive VW powered MKIIIC
[quote] ---
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Fri Jul 18, 2008 3:13 am Post subject: Re: kolb sighting/Jabiru Powered MKIII |
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Gaman and Ricochet,
It appears that in addition to slow flight contest, short landing and take-off contests, we are now competing for most deaf Kolb aviator.
For the record, you guys who are hearing challenged or impaired, you're gonna have a long ways to go to beat me in this regard. I am 100% deaf in both ears, but my bi-lateral cochlear implants enable me to converse with ATC pretty well and when I want to fly quietly, all I have to do is turn off the gadgets!
do not archive
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_________________
Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
- Anonymous |
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gaman(at)att.net
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| Posted: Fri Jul 18, 2008 5:05 am Post subject: kolb sighting/Jabiru Powered MKIII |
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Thom,
You win.
Do not archive.
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