Tonight's Dumb Idea...

[jim ivey]

Bob
Actually I understand your explanation,and suspected that was the case.I 
feel that the engine compartment is an unfriendly place for a servo,hi-temp 
and oil residue area.
I had a G62 with the throttle servo mounted inside the fuse on the box mount 
and it survived ok.
Go fer it.

Jim Ivey



jivey61 at msn.com





>From: "Bob Pastorello" <rcaerobob at cox.net>
>Reply-To: discussion at nsrca.org
>To: <discussion at nsrca.org>
>Subject: Re: Tonight's Dumb Idea...
>Date: Tue, 17 Feb 2004 19:11:38 -0600
>
>Actually, Jim, the vibration frequency of a typical YS or large 2 stroke is
>QUITE a bit lower.  Simply, the 049 piston/counterweight is slapping around
>at 22000 or more...the pattern motor somewhere around 8K.  That's an order
>of magnitude less.
>     Where the concern may be is the IMPULSE strength...the "thump" of that
>counterweight.  Kinda like an oil rig pump....HUGE counterweight, and the
>earth shakes with every thump....smaller pumps, pumping same rate but with
>different MASS counterweight - way less thump.
>
>Then there's the actual impact....If the servo, attached to the motor mass,
>is moving at exactly the same rate and intensity as the motor itself, I'd
>challenge that the RELATIVE force transmitted to the servo is LESS than 
>that
>of a servo constrained someplace in the airframe.  My theory is that the
>constraining force, distance, and rigiditiy of mounting actually modifies
>the resonance or thump that hits the servo.  AND - it's connected full time
>via the pushrod to the motor that is thumping along at it's natural rate.
>
>So we'll try it, and see what happens!!
>
>Bob Pastorello, Oklahoma
>NSRCA 199, AMA 46373
>rcaerobob at cox.net
>www.rcaerobats.net
>
>
>----- Original Message -----
>From: "jim ivey" <jivey61 at msn.com>
>To: <discussion at nsrca.org>
>Sent: Tuesday, February 17, 2004 6:59 PM
>Subject: Re: Tonight's Dumb Idea...
>
>
> > Ok enough. Have you ever held a .049 in you hand,between your fingers
>while
> > it was running.Multiply this vibration by 280 times and that is what the
> > servo feels that is mounted on the mount of a YS 140.
> > I'm dodging now.
> >
> > Jim Ivey
> >
> >
> >
> > jivey61 at msn.com
>
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