MK Dual Elavator Bellcrank & Pushrod?

[Ron Van Putte]

On Feb 3, 2005, at 11:43 AM, Rick Wallace wrote:

> Agree w/ John about using foam as a vibration damper. Also, someone 
> much wiser than me pointed out that whatever is installed should NOT 
> be halfway, 1/4 way, or any reasonable fraction of the pushrod 
> length because these may end up as stationary nodes in the vibrating 
> rod, and end up doing no good.

Rick - I thought  "stationary nodes" that "end up doing no good" were 
all those guys who complain about everything and help with nothing.  
<VBG>

BTW, that's good advice to place the foam dampers at irregular 
intervals to avoid the vibration nodes.

Ron Van Putte

> >From: "John Ferrell" <johnferrell at earthlink.net>
>  >Reply-To: discussion at nsrca.org
>  >To: <discussion at nsrca.org>
>  >Subject: Re: MK Dual Elavator Bellcrank & Pushrod?
>  >Date: Thu, 3 Feb 2005 09:07:36 -0500
>  >
>  >Be very careful about alignment. An extra bushing on the shaft can 
> cause a lock up under vibration.
>  >A foam rubber damper is safer. It can be as simple as a wad of foam 
> or as complicated as another bulkhead.
>  >
>  >John Ferrell
>  >http://DixieNC.US
>  >
>  >   ----- Original Message -----
>  >   From: Jerry Wilson
>  >   To: discussion at nsrca.org
>  >   Sent: Wednesday, February 02, 2005 10:59 PM
>  >   Subject: MK Dual Elavator Bellcrank & Pushrod?
>  >
>  >
>  >   I've mounted the bellcrank and will use Central's carbon fiber 
> push rod.  The pushrod length from servo to crank is about 28".
>  >
>  >
>  >
>  >   Is it necessary to install a support of the rod  halfway down the 
> fuselage to prevent flexing.  And if so does anyone have a simple way 
> of doing this inside a fiberglass fuselage?
>  >
>  >
>  >
>  >   TIA
>  >
>  >   Jerry
>  >
>  >

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