[NSRCA-discussion] Nose-Rings: O-ring replacement forCHnosering?

Thu Aug 9 05:59:20 AKDT 2007

I just sanded down the surface of the engine to fit right then made all my engines the same size in that spot. I too couldn't find a good fit O ring and I must have 1,000 in stock.

"Woodward, Jim" <jim.woodward at baesystems.com> wrote:        v\:* {behavior:url(#default#VML);}  o\:* {behavior:url(#default#VML);}  w\:* {behavior:url(#default#VML);}  .shape {behavior:url(#default#VML);}        st1\:*{behavior:url(#default#ieooui) }                Following up on the nose-ring thread.  This is pesky little piece of necessary equipment.  If the nose-ring is too tight, all kinds of funny things will happen with bolts shaking out, or maybe the nose-ring mounts breaking.  Before I really clued into the CH nose-ring not allowing rotation as it should, the nose-ring bolts were backing out every 3rd flight and would rub the spinner backplate.  After this happens a few times the 4-40 thread would not be good and it would need drilling out in favor of passing through the 4-40 and using lock nuts.  However the locknuts wouldn’t seat correctly because of the angle of the bevel – IE there is not enough spacing from the 4-40 holes to where the bevel begins to allow for
 a washer, or just even a lock nut to seat properly against the flat spot of the ring.  

  I recognize there are fixes to it but will go ahead and try the nose-ring seen at this link from Jerry’s website:    http://www.buddengineering.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=NRSWNR&Category_Code=P

  This nose-ring is more similar to our old favorite from Clayton Foster, and has a nice flat section where you can use a washer and locknut to secure it to the plane.

  Also, I have 3 YS 160’s.  All of them had too tight of a fit to allow the nose-ring to work properly.  I had made some NR out of 1/8” plywood and lined them with split fuel tubing as the best way to get the proper acting nose-ring.  However, given some shortness of time and such, it is nice to buy the product that fits right from the start so I am going to try the nose-ring depicted on the front of this assembly from Jerry.

  Thanks,
  Jim W.

---------------------------------

  From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of rcmaster199 at aol.com
Sent: Thursday, August 09, 2007 7:53 AM
To: nsrca-discussion at lists.nsrca.org
Subject: Re: [NSRCA-discussion] Nose-Rings: O-ring replacement forCHnosering?

  I use 3/16" rubber sheet from McMaster Carr. Cost was around 8 bux for a 1 foot square sheet as I recall. I have not had one fail yet (about 6 years now) but I have used them in 2 stroke applications, all the way up to a 2.10 cu in. The typical weight of one of these is around 6-8 grams. I also intend to use the technique for my new ZDZ40 F3A

Matt

-----Original Message-----
From: Ron Van Putte <vanputte at cox.net>
To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
Sent: Wed, 8 Aug 2007 10:08 pm
Subject: Re: [NSRCA-discussion] Nose-Rings: O-ring replacement forCHnosering?
    What a great idea!  It appeals to my inner Scot.  My mother was born in Scotland. 

    What's the thickness of the rubber sheet stock? 

    Ron Van Putte

      On Aug 8, 2007, at 9:33 PM, rcmaster199 at aol.com wrote:

    For those inclined to get "primitive" as Jim put it, here's what has worked for me:

    I use a tool designed for circle cuts mounted in a drill press, to cut the ID in rubber sheet stock. I measure the engine's front block and then adjust the tool to give me the exact cut. 

    The sheet is then cut in the form of a nose ring in my band saw, leaving about 3/16" edge all around, and "ears" at the mounting locations. Takes about 15 minutes of work and voila, the exact fit one needs and the whole thing is made of rubber

MattK

-----Original Message-----
From: Mike Hester <kerlock at comcast.net>
To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
Sent: Wed, 8 Aug 2007 11:43 am
Subject: Re: [NSRCA-discussion] Nose-Rings: O-ring replacement forCHnosering?

      Well after Vaughn told me the same thing, I mic-ed the 2 motors I had and they are indeed different, that's why there is no standard O ring that makes it all happy. So, a few minutes with a dremel and a lot of patience seems to be the answer. Just keep it round =)

    On that same note, I made the mistake early on of using the nose ring as-is. It may as well had been hard mounted. Everything on the plane shook loose....screws, adjusters, rattled the antenna out of the tube, you name it. Cost me a set of servos before I had that conversation and fixed it.

    "Don't be that guy"....LOL 

    -Mike

      ----- Original Message ----- 

    From: Woodward, Jim 

    To: NSRCA Mailing List 

    Sent: Wednesday, August 08, 2007 12:36 PM

    Subject: Re: [NSRCA-discussion] Nose-Rings: O-ring replacement forCHnosering?

      Thanks Mike,

    I can get primitive on the O-ring J   I was hoping for a McMaster Carr P/N.  If I find one, I think it would be a good idea for Central to supply two sizes of O-rings with unit to ensure it fits the motors.

    Thanks,

    Jim

    From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Mike Hester
Sent: Wednesday, August 08, 2007 12:32 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Nose-Rings: O-ring replacement for CHnosering?

      After much discussion, trial and error, the "fix" to this is to gently remove material from the O ring with a dremel and large drum sander, until it is a slip fit. You don't want it sloppy, but it should slide on and off without having to force it. Install with some lithium grease and you're all set! I've had to do a ton like this.

      -Mike

        ----- Original Message ----- 

      From: Woodward, Jim 

      To: NSRCA Mailing List 

      Sent: Wednesday, August 08, 2007 12:26 PM

      Subject: [NSRCA-discussion] Nose-Rings: O-ring replacement for CH nosering?

      Hi Guys,

    A while back Clayton Foster was making the CFE nose-rings and they always seemed to fit perfectly – snug but allows the engine to still rock back and forth.  I understand now that he is no longer making them, and that the Central Hobbies Nose-ring was supposed to be a replacement for it.  I have had several of the CH nose-rings and they fit so tightly as to form nearly a welded lock of the rubber to the motor.  I’m not opposed to making my own nose-rings, but I actually like the idea of being able to purchase something and use it once in a while too.  

    Has anyone found a P/N or different size O-ring to make these units fit the YS correctly?  After just speaking to Vaughn, he felt that the YS dimensional variances were too much to deal with so they shot for the middle ground.  If anyone has spec’d or tried a new o-ring for this device and could pass it along that would be great.

    Thanks,

    Jim

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