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propeller to boom tube clearance?

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tombaisley

Joined: 20 Jan 2012
Posts: 30
Location: afton,ny

Posted: Tue Dec 10, 2013 3:04 am Post subject: propeller to boom tube clearance?

I have a MKIIIC w/ 582, installed a  66" two bladed prop mounted with a 3.5" spacer. The clearance is .875", it looks awful close?

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rowedenny

Joined: 09 Mar 2008
Posts: 338
Location: Western PA

Posted: Tue Dec 10, 2013 6:19 am Post subject: propeller to boom tube clearance?

My distance is 1.5", but I have heard of some that are less than  an inch. My current engine is super smooth so it doesn't shake too much, when I swap to the 2 cylinder Rotax 670 I'm going to maintain at least my current distance as I have heard they are a little rough below 2500 rpm. 

Pretty sure you'll be ok, but check with other 582 operators.



Dennis "Skid" Rowe

Mk3, 690L-70, Leechburg, PA



 	  Quote: 	
		   On Dec 10, 2013, at 6:04 AM, "tombaisley" <tombaisley(at)yahoo.com> wrote:

 

 

 

 I have a MKIIIC w/ 582, installed a  66" two bladed prop mounted with a 3.5" spacer. The clearance is .875", it looks awful close?

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=415303#415303

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Arty Trost

Joined: 25 May 2006
Posts: 205
Location: Sandy, Oregon

Posted: Tue Dec 10, 2013 6:34 am Post subject: propeller to boom tube clearance?

Although this happened in a Drifter - the placement of the boom and propeller is similar enough that I'll share my own experience. I was testing a new prop that was slightly longer than the one I'd been flying with. There was about 1.5" clearance and it seemed fine - so I took it for a test flight. It was a fairly windy day and I landed at a friend's airport; due to the configuration of hangars and hills and wind, I ran into mechanical windshear. I bounced upon landing, the boom flexed... and I ended up trucking the Drifter out for repairs. 



I had flown many times in that level wind, had ignimoniously bounced  before - but never with such disasterous results. I attribute it totally to the longer prop that didn't allow for sufficient clearance.



The guys on this list will probably tell you what the correct clearance should be - and perhaps say that my Drifter experience has no similarity to your Kolb. But your question brought up vivid memories!



Arty Trost

Sandy, Oregon

 

www.LessonsFromTheEdge.com/uladventure2009.htm



"Life's a daring adventure or nothing"                      Helen  Keller



"I refuse to tip toe through life just to arrive safely at death."

       On Tuesday, December 10, 2013 3:10 AM, tombaisley <tombaisley(at)yahoo.com> wrote:  

   -->  Kolb-List message posted by: "tombaisley" <tombaisley(at)yahoo.com (tombaisley(at)yahoo.com)>I have a MKIIIC w/ 582, installed a  66" two bladed prop mounted with a 3.5" spacer. The clearance is .875", it looks awful close?Read this topic online here:http://forums.matronics.com/viewtopic.php?p=415303#415303http://www.matronics.com/contributip;                     &nhsp;              - MATRONICS WEB FORUMS -

  

 

  



 



 [quote][b]

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Tue Dec 10, 2013 7:03 am Post subject: propeller to boom tube clearance?

I have a MKIIIC w/ 582, installed a  66" two bladed prop mounted with a 3.5"

spacer. The clearance is .875", it looks awful close?

 



Tom B/Kolbers:



Without digging out the MKIII Manual, I believe tail boom to prop tip

clearance is 1".



My last flight to Alaska I flew with a 72" Warp Drive 3 blade prop with 3/4"

prop tip to tail boom clearance.



Take a look at the way the engine mounts and airframe are designed.  Then

see how much you can deflect the engine downward.  



I don't recommend anyone flying with less than the published factory prop

tip to tail boom clearance.  However, 3/4" prop clearance was thoroughly

tested before, during, and after my last flight north.



john h

mkIII

Titus, Alabama

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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Tue Dec 10, 2013 7:17 am Post subject: propeller to boom tube clearance?

Although this happened in a Drifter - the placement of the boom and propeller is similar enough that I'll share my own experience. 

Arty Trost

Sandy, Oregon



 	  Quote: 	
		      Arty T/Kolbers: Although the placement of the prop tip and tail boom on a Kolb, all models, is similar to a Maxair Drifter, that is where the similarity ends.  If my recollection serves me correctly, the Drifter engine is mounted on a single square aluminum root tube that projects aft of any main fuselage down tubes for vertical support.  Sitting here at my computer I can visualize that root tube deflecting downward during a hard landing. I once stalled my mkIII during takeoff from a very confined area at  about 30 feet altitude with full flaps.  I hit the ground so hard, in a level attitude, it wiped the main gear off the aircraft.  After I finished crashing, I noticed two things.  One, I was sitting much closer to the ground, and two, I could not find my glasses.  Was wearing David Clark headset at the time.  I hit the ground hard enough my glasses ended up in the nose pod.  Despite the other damage, there was no prop strike.  The prop was still turning when I hit the ground.   	
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

rickofudall

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

Posted: Tue Dec 10, 2013 8:23 am Post subject: propeller to boom tube clearance?

Tom, I used a finger width as my gauge for clearance on the same setup. If you need more clearance you can flop the motor mounts, depending on how you have them set, so that the long side is down on the front pair and up on the rear pair. The change in angle also helps the airplane trim up a bit easier, too and you don't have to buy any new hardware. 



Rick Girard



On Tue, Dec 10, 2013 at 5:04 AM, tombaisley <tombaisley(at)yahoo.com (tombaisley(at)yahoo.com)> wrote:

  	  Quote: 	
		  --> Kolb-List message posted by: "tombaisley" <tombaisley(at)yahoo.com (tombaisley(at)yahoo.com)>

  

 I have a MKIIIC w/ 582, installed a  66" two bladed prop mounted with a 3.5" spacer. The clearance is .875", it looks awful close?

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=415303#415303

 

 

 

 

 

 

 

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