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condensation on carb

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tkben002

Joined: 06 Jul 2011
Posts: 54
Location: Alexandria, LA

Posted: Tue Aug 09, 2011 3:15 pm Post subject: condensation on carb

I have almost 5 hours on my new to me Kolbra and enjoying every minute of it, however I am starting to come into some questions I am hoping someone here will be able to help me out with.



First, I will try to attach a picture but not sure if it will come thru or not, but after flying over the weekend I noticed condensation on the carb.  At first I thought it was a gas leak but it did not taste or smell like gas.  It was almost 100 degrees outside with a relative humidity around 60%.  Is this normal?  Have you ever noticed this before on yours with these conditions?  If so, makes me wary of flying in the winter due to carb ice.



Second, I have and EIS and jabiru 2200.  The last time I flew there was a 70 degree difference the in the CHT's ( 245 to 250 on one to 300 to 320 on the other)  Any ideas on where to check (all cables and connections are tight).



Third, Initially the RPMS have been pretty consitant but the last time I flew they fluctuated quite a bit and never really settled down,  fluctuations were usually from 200 to 500 rpms.  



Lastly, performance,  I have a 2200 and a warp drive ground adjustable 58" prop  ( i do not know what it is set at but will check shortly)  I am only getting about 650 fpm climb solo.  I am getting 2860 to 2940 climb/WOT.  I think I should take out some pitch but not sure how much to take out, any recommendations?



Thanks in advance



Travis

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Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Tue Aug 09, 2011 3:55 pm Post subject: Re: condensation on carb

Travis,

The condensation on the carb is probably due the cold carb body (fuel evaporation inside throat) and the relatively high moisture content in the hotter outside air condensing on the colder surface. Just like on the outside of your iced tea glass on a hot day. Does not mean you are having carb ice.



Assuming your engine is running properly and making power as it should, it appears that you do need to reduce the pitch in your prop. At Vy and WOT you should be seeing 3,000 rpm. The climb rate should improve somewhat with higher rpm during climb. With over pitched prop on a 100 degree day you can't expect a very high rate of climb with a direct drive engine. How much does your Kolbra weigh empty and how much during your typical solo flight? Where are you located?



My rpms are steady (EIS). You should call Jabiru about this. They have been helpful every time I've called.



All my CHTs are usually within 25-30 degrees of each other but it sometimes takes some careful modifications of baffles in the air scoops to get this. Ask Jabiru about this too.

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_________________
Thom Riddle
Buffalo, NY (9G0)

Don't worry about old age... it doesn't last very long.
- Anonymous

tkben002

Joined: 06 Jul 2011
Posts: 54
Location: Alexandria, LA

Posted: Tue Aug 09, 2011 3:56 pm Post subject: Re: condensation on carb

I just went and checked the prop pitch.  It appears to be between 13 and 13.5 degrees at the tip. (if I did it right).



Travis

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Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Tue Aug 09, 2011 3:57 pm Post subject: Re: condensation on carb

Trvis,



forgot to mention that it would be helpful if you would reduce the size of your photo attachments a bit before posting.

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Thom Riddle
Buffalo, NY (9G0)

Don't worry about old age... it doesn't last very long.
- Anonymous

Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Tue Aug 09, 2011 4:10 pm Post subject: condensation on carb

Travis,



It is important to get both blades pitched as close to the same as

possible. 1/2 degree difference is not as close as they should be to

minimize vibrations.



Thom



On Aug 9, 2011, at 8:01 PM, "tkben002" <tkben002(at)bellsouth.net> wrote:



 	  Quote: 	
		   



 I just went and checked the prop pitch.  It appears to be between 13 and 13.5 degrees at the tip. (if I did it right).



 Travis





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=349066#349066

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_________________
Thom Riddle
Buffalo, NY (9G0)

Don't worry about old age... it doesn't last very long.
- Anonymous

tkben002

Joined: 06 Jul 2011
Posts: 54
Location: Alexandria, LA

Posted: Tue Aug 09, 2011 4:48 pm Post subject: Re: condensation on carb

the kolbra empty is 580, and with me in it I am anywhere from 830 to 870 depending on how much gas I have at the time.

The Cht probes are on cylinders 1 and 2 and I assumed those are the hottest cylinders (which are yours on), the cht's on the previous flight were pretty close to the same and the rpms were normal, just the last time everything fluctuated quite a bit.  I figured there was something loose (wire, etc) but I have been unable to find it.

I have been taking my time trying to go over everything with the plane since it is new to me, and trying to fine tune it the best I can.  



Thanks,

Travis

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Richard Pike

Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee

Posted: Tue Aug 09, 2011 7:36 pm Post subject: Re: condensation on carb

It is impossible to figure out what you are trying to show. Use picture resizer to get the picture to a manageable size.



Richard Pike

MKIII N420P (420ldPoops)

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Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Wed Aug 10, 2011 2:49 am Post subject: Re: condensation on carb

Travis,

I have CHT sensors on cylinders 1,2 & 3. A single EGT on cylinder #4.

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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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