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