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  #1  
Old 06-10-2015, 01:52 PM
Steve51B's Avatar
Steve51B Steve51B is offline
 
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Location: St. Paul, MN
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Default Is this a Landol Ring?

I recently removed this from the RV-4 that I purchased last Autumn. I rarely have a passenger and I'm trying to lighten up my plane.
I think it's a Landol ring, however, I've never seen a picture of one and a google image search netted me noting useful. I'm sure there are a few of you that can identify this thing.



The back side:



Detail of the only marking on it:



This is where it was on the plane:



Thanks
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  #2  
Old 06-10-2015, 02:30 PM
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Taildrgr Taildrgr is offline
 
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It looks like one to me. I had one on my RV-4.

It was hollow and filled with a weight ring and gel that was supposed to dampen the engine pulses in my wood prop.
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  #3  
Old 06-10-2015, 02:47 PM
BillL BillL is offline
 
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Location: Central IL
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OK, long version, Yes, technically it is called a visconic damper. An engine crankshaft rotation is a series of decelerations due to compression, and accelerations due to the power stroke. Additionally, there are torsional rotations of the crankshaft between the ends. The damper helps "average" the accelerations and decelerations, and is especially helpful at reduction of torsional peaks.

I don't know what specific problem it solves on this application, did you notice more/less vibration or other effects?
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and express it in numbers, you know something about it; but when you
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Last edited by BillL : 06-10-2015 at 02:51 PM.
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  #4  
Old 06-10-2015, 03:10 PM
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Steve51B Steve51B is offline
 
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Location: St. Paul, MN
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I didn't notice any differences in vibrations. I have a Sensenich wood prop and I called them to make certain it wasn't required. They said it is not required.

I get a slightly better pitch response now due to the CG being moved aft by a little bit.

I think that the builder installed it to move the CG forward since he was always hauling a passenger and some baggage. I very rarely fly with a passenger or baggage.

I guess that Landol is a brand name for what you described BillL. I'm wondering if it's a Landol or some other brand?
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  #5  
Old 06-10-2015, 04:27 PM
rv7charlie rv7charlie is offline
 
Join Date: May 2006
Location: Pocahontas MS
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Mark Landoll made what he called a harmonic damper or balancer with the weight in silicone, but also sold a simple steel ring that looked like that; intended to help with CG issues on some of the early RV's with wood props. Basically turned the starter ring gear assembly into a true flywheel. He was also one of the pioneers selling 'light weight' (automotive) starters and alternators. I had his steel ring, starter and alternator on the 1st -4 I owned (installed by the builder before I bought it).

Pretty sharp guy. Was flying a -4 when I first met him; later built a 'super 8' with a big 6cyl on it. I've known him for around 25 years, but haven't heard from him in at least a half dozen. Last time I talked to him he said he was retiring from selling a/c stuff. His company & phone number still come up if you use the google....

Charlie
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  #6  
Old 06-10-2015, 05:33 PM
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Steve51B Steve51B is offline
 
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So, rv7charlie, is it a Landol ring?
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  #7  
Old 06-10-2015, 06:52 PM
Kyle Boatright Kyle Boatright is offline
 
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Location: Atlanta, GA
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Quote:
Originally Posted by Steve51B View Post
So, rv7charlie, is it a Landol ring?
Almost certainly. (Sez a guy who used to own one.)
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  #8  
Old 06-10-2015, 07:07 PM
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Steve51B Steve51B is offline
 
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Thank you Kyle
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  #9  
Old 06-10-2015, 08:14 PM
qtrmiledan qtrmiledan is offline
 
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Location: Baton Rouge,La.
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Default Ring

Steve51B Check your PM's
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  #10  
Old 06-10-2015, 09:01 PM
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Neal@F14 Neal@F14 is offline
 
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That looks like a Landol harmonic balancer, not a "Landol Ring". The ring is just a plain steel ring. Both are valuable to the right buyer.
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