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Anyone with a jab on a mk3c/x??

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ces308

Joined: 03 Nov 2008
Posts: 317
Location: houghton lake ,mi

Posted: Mon Nov 17, 2008 10:31 pm Post subject: Anyone with a jab on a mk3c/x??

Is there anyone out there with a Jabiru 2200 on a MK 3 C or X ?If there is can you please give me some kind of idea of how it flies with it? 



thanks,

chris ambrose

pj.ladd(at)btinternet.com
Guest

Posted: Tue Nov 18, 2008 3:48 am Post subject: Anyone with a jab on a mk3c/x??

Jabiru 2200 on a MK 3 C or X >>



Hi Chris,

The Jabi is the only 4 stroke cleared for use with the Xtra in the UK. 

Lighter than the 912.  I have only been able to accumulate a few flying 

hours, this summer has been almost non existent, and I have not flown the 

Kolb with any other engine.



I can not give you comparisons but apart from being very noisy it seems OK. 

The noise I think is not the fault of the Jabi.  In the tractor 

configuration and cowled it is very quiet but totally exposed and with the 

pusher set up you wouldn`t want to fly without a headset.

With your rules of course there is nothing to stop you making a nice 

streamlined fairing which might change the whole aspect.

The engine is designed to run at 2800 rpm and this will give  65/70+ 

depending on trim and load.



Cheers



Pat

Ricochet

Joined: 29 May 2008
Posts: 36
Location: Fresno, CA

Posted: Tue Nov 18, 2008 8:28 am Post subject: Anyone with a jab on a mk3c/x??

Pat,



FWIW, there are many of us flying in front of and behind the Jab.   

Prop length makes a huge difference in noise in the pusher  

configuration.  Though not quiet, my 58-inch prop in a pusher config  

was way more quiet than the guys who used 62-inch props, regardless  

of the pusher they were flying.  As you say, in the tractor  

configuration it's an all together different story.  My Skyranger is  

known as the airport stealth, it's so quiet.



Jerry



 	  Quote: 	
		  

 I can not give you comparisons but apart from being very noisy it  

 seems OK. The noise I think is not the fault of the Jabi.  In the  

 tractor configuration and cowled it is very quiet but totally  

 exposed and with the pusher set up you wouldn`t want to fly without  

 a headset.

JetPilot

Joined: 10 Jan 2006
Posts: 1246

Posted: Tue Nov 18, 2008 10:01 am Post subject: Re: Anyone with a jab on a mk3c/x??

Pat,



The MX III is very loud inside with the 912 also, even with headsets the noise was a problem for me.  I don't know if you are allowed to modify anything on your plane in the UK, but the fix is pretty cheap and easy to do.  My airplane is much more enjoyable to fly since the sound proofing.  If you want pictures, let me know.



Mike

_________________
"NO FEAR" - If you have no fear you did not go as fast as you could have !!!

Kolb MK-III Xtra, 912-S

ces308

Joined: 03 Nov 2008
Posts: 317
Location: houghton lake ,mi

Posted: Tue Nov 18, 2008 10:12 am Post subject: Re: Anyone with a jab on a mk3c/x??

Mike...

Pictures ,please....always pictures!



Thank you all for responding to this!...one more thing too...pushers are always louder...Listen to a Lake or a Cessna 337...you can alway tell them apart from the others..

gaman(at)att.net
Guest

Posted: Tue Nov 18, 2008 10:15 am Post subject: Anyone with a jab on a mk3c/x??

Chris,

    That would be me.It flies fine,good climb,70 cruise (at)2600rpm,2.8 gph.Top speed full throttle,3100 rpm just under 90mph,and 2000hr TBO.Easy starting,smooth running.That being said,everyone on this list will tell you not to install one on your aircraft ,and for good reason.A direct drive prop generates a boat load of noise above 2300rpm on a pusher.I have gone to extraordinary measures to silence this in the cabin,and can say that it is only tolerable.Not good,not fair,only tolerable.It's a good engine,without the rattles and shudder you get out of the 912 series on shut down and startup.But that slow turning prop on the 912s  make it hard to beat on a pusher.The VW with redrive is as close as you can get and for about 1/2 the money.Happy hunting

  Gary  Aman MK-C jabiru 2200 390 hrs. 

From: ces308 <ces308(at)ldaco.com>

To: kolb-list(at)matronics.com

Sent: Tuesday, November 18, 2008 1:32:00 AM

Subject: Anyone with a jab on a mk3c/x??



 [quote][b]

NeilsenRM(at)comcast.net
Guest

Posted: Tue Nov 18, 2008 1:21 pm Post subject: Anyone with a jab on a mk3c/x??

Hey guys with all the changes I have made to engines over the years the 

primary noise maker is the prop. Get your tip speeds down and most of the 

noise will disappear. When I had a direct drive VW with a 60 inch prop 

turning 3600 RPM the tips would go super sonic. It would wake the dead, When 

switched to a 72 inch prop turning 2200 RPM it got much quieter. I had tried 

insulation and a muffler but nothing made as much impact as cutting the prop 

tip speeds.



Later when I changed to a new engine mounting system and some of the noise 

came back. So another major source of noise inside the cockpit is 

transmission of engine vibrations thru the engine mount. Set up a engine 

mount that lets the engine float as much as possible with out twisting or 

moving around too much.



Hope this helps.



Rick Neilsen

Redrive VW powered MKIIIC



---

Ricochet

Joined: 29 May 2008
Posts: 36
Location: Fresno, CA

Posted: Tue Nov 18, 2008 6:55 pm Post subject: Anyone with a jab on a mk3c/x??

Another way for reducing pusher prop noise, though I'm probably  

repeating myself, is to go to a 3-blade prop instead of a two.  Much  

of the noise comes from the blades chopping the disturbed air off the  

wings.  With a 2-blade, both blades chop at the same time increasing  

the noise level.  Three blades have only one blade at a time chopping  

the air, thereby reducing the noise.  The only three blade I'm aware  

of for a Jabiru is a Warp with perhaps a special adaptor plate.  If  

Sensenich's new carbon fibre prop can be had with three blades, that  

would be the way to go IMHO, but perhaps a touch expensive.



Jerry

On Nov 18, 2008, at 1:20 PM, Richard & Martha Neilsen wrote:



 	  Quote: 	
		   

 <NeilsenRM(at)comcast.net>



 Hey guys with all the changes I have made to engines over the years  

 the primary noise maker is the prop. Get your tip speeds down and  

 most of the noise will disappear.

 _

ces308

Joined: 03 Nov 2008
Posts: 317
Location: houghton lake ,mi

Posted: Tue Nov 18, 2008 7:56 pm Post subject: Re: Anyone with a jab on a mk3c/x??

I know....I was told that about the prop too....First i need to get this thing in the air and see what it does to get a base line...



chris ambrose

pj.ladd(at)btinternet.com
Guest

Posted: Wed Nov 19, 2008 2:15 am Post subject: Anyone with a jab on a mk3c/x??

gone to extraordinary measures to silence this in  the cabin,>>

  

 Its not noise in the cabin which is the problem in  the UK. It is the measured noise OUTSIDE which decides wether you get  a  noise certificate issued. Without it, you don`t fly.

  

 Various countries in Europe have differing levels  with the Germans, I think, being the tightest. Cutting down on the noise has  probably done more for the acceptance by the general public of our sort of  flying than anything else.

  

 Cheers

  

 Pat

   [quote][b]

pj.ladd(at)btinternet.com
Guest

Posted: Wed Nov 19, 2008 2:19 am Post subject: Anyone with a jab on a mk3c/x??

allowed to modify anything on your plane>>



Hi Mike,



provided that it doesn`t put the weight up above the limit or change 

something radically we are ok.

A different prop for instance would need clearance but rubber buffers, 

insulation materials stuck on panels etc would be OK.



Pics please.



Pat

pj.ladd(at)btinternet.com
Guest

Posted: Wed Nov 19, 2008 2:27 am Post subject: Anyone with a jab on a mk3c/x??

My Skyranger is

known as the airport stealth, it's so quiet.>>



Hi Jerry,

just a long shot but are you the person who rang me the other day to talk 

about Jabi`s on Kolbs?



Pat

Ricochet

Joined: 29 May 2008
Posts: 36
Location: Fresno, CA

Posted: Wed Nov 19, 2008 10:21 am Post subject: Anyone with a jab on a mk3c/x??

No Pat, not me.



Jerry

On Nov 19, 2008, at 2:26 AM, pj.ladd wrote:



 	  Quote: 	
		   



 My Skyranger is

 known as the airport stealth, it's so quiet.>>



 Hi Jerry,

 just a long shot but are you the person who rang me the other day  

 to talk about Jabi`s on Kolbs?



 Pat

HShack(at)aol.com
Guest

Posted: Wed Nov 19, 2008 5:40 pm Post subject: Anyone with a jab on a mk3c/x??

If a Warp will work an a Jabi, then a Kiev prop [aka Hot Prop] will work  even better.  It's a lot lighter.

  

 Howard  Shackleford

FS II

SC   

  In a message dated 11/18/2008 9:55:35 P.M. Eastern Standard Time,  maderah2(at)sbcglobal.net writes:

  	  Quote: 	
		  The only    three blade I'm aware  

of for a Jabiru is a Warp with perhaps a    special adaptor plate.   

	






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