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Trim System Question
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Richard Pike

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

Posted: Wed Nov 11, 2009 6:45 pm Post subject: Re: Trim System Question

[quote="pj.ladd(at)btinternet.com"]The intention was to reduce noise  >>

  

 Hi there,

  

 Did it?  The farmer who owns the field I fly  from is constantly wickering on about the noise from the Kolb. He says it is  worse that the Challenger I used to have and that got him pretty hot under the  collar.

  

 Noise seems to be built in with a pusher  configuration. Not noise in the cockpit, that can be dealt with by decent  headphones , but the noise which causes complaints from the  neighbours.

  

 i cocked up a landing the other day and decided on  another circuit for practice. I am reluctant to climb out at less than full  throttle so went out at full chat and the farmer was waiting for me when i  landed, looking down his nose. Of course he flies a Cub which makes no more  noise than a sewing machine.

  

 Does a larger a gap between the trailing edge and  the prop help?

  

 Pat

    	  Quote: 	
		  [b] 	




Pat, don't remember what engine/gearbox you are running, but recently I had a chance to fly a MKIII with a C box on the 582, and a 3 blade Warp. The 3:1 gearbox makes the prop noise way less than my 2.58:1 box. Also got to stand on the ground and listen to it while someone else flew it, and it is much quieter. Apparently prop noise is the biggie.



Richard Pike

MKIII N420P (420ldPoops)

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Thom Riddle

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

Posted: Thu Nov 12, 2009 5:10 am Post subject: Re: Trim System Question

Richard,



Pat and I and several other Kolbers have Jabiru power with no PSRU so the prop noise can get pretty onerous. My full throttle climb at Vy is at 3,000 rpm. The 64" prop means a tip speed of about 570 mph. Not Mach 1 but a good bit faster than most Rotax powered props. 



Pat can correct me if I'm wrong but I'm pretty sure the UK does not permit his Jabiru powered Kolb to turn the maximum the engine manufacturer allows (3,300 rpm) because of the noise regulations.

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rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Thu Nov 12, 2009 6:16 am Post subject: Trim System Question

Richard, Pat, I second this. My IIIC has a 582, C box with 4:1 and 3 blade 66" WD prop. My neighbor has told me I can barely be heard on downwind when I fly it low (700' instead of 1000'). My other neighbor flies a couple VW direct drive planes and can still be heard when he's out of sight. 



Rick Girard

do not archive



On Wed, Nov 11, 2009 at 8:45 PM, Richard Pike <richard(at)bcchapel.org (richard(at)bcchapel.org)> wrote:

 [quote]--> Kolb-List message posted by: "Richard Pike" <richard(at)bcchapel.org (richard(at)bcchapel.org)>

  

 [quote="pj.ladd(at)btinternet.com"]The intention was to reduce noise  >>

 

  Hi there,

 

  Did it?  The farmer who owns the field I fly  from is constantly wickering on about the noise from the Kolb. He says it is  worse that the Challenger I used to have and that got him pretty hot under the  collar.

 

  Noise seems to be built in with a pusher  configuration. Not noise in the cockpit, that can be dealt with by decent  headphones , but the noise which causes complaints from the  neighbours.

 

  i cocked up a landing the other day and decided on  another circuit for practice. I am reluctant to climb out at less than full  throttle so went out at full chat and the farmer was waiting for me when i  landed, looking down his nose. Of course he flies a Cub which makes no more  noise than a sewing machine.

  

  Does a larger a gap between the trailing edge and  the prop help?

 

  Pat

 

 > [b]

 

 

 Pat, don't remember what engine/gearbox you are running, but recently I had a chance to fly a MKIII with a C box on the 582, and a 3 blade Warp. The 3:1 gearbox makes the prop noise way less than my 2.58:1 box. Also got to stand on the ground and listen to it while someone else flew it, and it is much quieter. Apparently prop noise is the biggie.

  

 Richard Pike

 MKIII N420P (420ldPoops)

 

 

 

 

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pj.ladd(at)btinternet.com
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Posted: Thu Nov 12, 2009 6:27 am Post subject: Trim System Question

Pat, don't remember what engine/gearbox you are running,>>



Hi Richard,

I have a Jabiru with a 2 blade 157 cms dia..  I had  a 503 with a 2 blade on 

the Challenger.



Pat

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