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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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 Posted: Mon Jul 04, 2011 11:07 am Post subject: Re: N1014S MarkIII Xtra first flight - Frank D |
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Frank,
Welcome to the growing number of Jabiru powered Kolbs. What serial number is your Jabiru and what prop are you turning?
FYI, my Jabiru has not needed an oil cooler in about 270 hours.
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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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ces308
Joined: 03 Nov 2008
Posts: 317
Location: houghton lake ,mi
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| Posted: Mon Jul 04, 2011 6:11 pm Post subject: Re: N1014S MarkIII Xtra first flight - Frank D |
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Thom...
What are you CHT's at cruise?? And are these the back 2 cylinders?? (closest to the prop?) Also I have been comparing your rpm/gph findings with mine and find the fuel burn is very close to the same as yours at those rpm settings !
chris ambrose
M3X/Jabiru A 2200 194 .hrs
N327CS
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Frankd
Joined: 28 Mar 2008
Posts: 64
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| Posted: Mon Jul 04, 2011 8:30 pm Post subject: Re: Jabiru scoops |
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Hi Guys,
The scoops on my Jabiru are certainly non-standard, they are for a trike and I also have a prop extension.
The scoops go around a body so they spread out at the front. But it gives a nice area to put the oil cooler if I want one.
Before I put the extension on the prop the distance between the back end of the scoop and the prop was about 1/2 inch, now it 4 inches! Not the best at sucking the air thru the tube, so it get hot fast..
If I don't get the temps down quickly, I'll buy normal scoops going all the way to the prop..
EXPERIMENTAL takes on a new meaning..
Fly safe.
FrankD
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Tue Jul 05, 2011 2:39 am Post subject: Re: N1014S MarkIII Xtra first flight - Frank D |
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Chris,
I monitor three cylinders for CHT and one for EGT. My typical cruise speed is 82-85 mph at about 2725-2750 rpm with CHTs running around 250F. The oil temperature at cruise is generally in the 200F-210F and the EGT is rich at around 1200F at low altitude and lower still at higher altitudes.
During climb at Vy (60mph) and WOT the CHTs go to 300-320F or so at 3,000 RPM. They might go higher if I continued to climb at full throttle but my EGT gets over 1350 so I back off the throttle or put the nose down to correct that.
Because of the rich cruise and lean WOT condition, I finally got around to ordering a richer main jet and leaner needle jet which should arrive this week. If they work as suggested, I should be able to continue WOT climb at Vy and see how high the CHTs go. Also hope for higher EGTs at cruise and consequent lower fuel consumption.
I'd like to see your numbers too.
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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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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Tue Jul 05, 2011 2:45 am Post subject: Re: N1014S MarkIII Xtra first flight - Frank D |
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Frank,
The NORMAL Jabiru scoops do not go to the prop. There are baffles at the entry and between the cylinders to make sure the air is directed over and then down between the cylinders and down at the back of the aft cylinders.
Attached is a photo of the normal scoops on my Jabiru.
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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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