From: "Russell Jocoy" 
To: russjocoy{at}hotmail.com, telmor{at}teleport.com, milnecd{at}yahoo.com,
        atm{at}shore.net
Reply-To: "Russell Jocoy" 


>From: "Russell Jocoy" 
>Reply-To: "Russell Jocoy" 
>To: telmor{at}teleport.com, milnecd{at}yahoo.com, atm{at}shore.net
>Subject: Re: ATM Truss design thoughts.
>Date: Fri, 25 Jul 2003 22:22:59 -0400
>
>
>>From: Chuck Dethloff 
>>To: "Russell Jocoy"
>>,milnecd{at}yahoo.com,atm{at}shore.net
>>Subject: Re: ATM Truss design thoughts.
>>Date: Fri, 25 Jul 2003 13:08:16 -0700
>>
>>Russ,
>>

("atm{at}shore.net")

    Chuck,     Just a short response, I am in total agreement of you
statements of the previous listing.
     I do believe that no matter how small or "BIG" your primary mirror is
,... it needs to be supported
not only in the traditional "cell" type mount but also given the
picture frame safety clip capture on the front surface. This can be done
with minimal interference to the primary and insure that that precious
piece
of glass does not fall on it's face.  PS  even though  the back is glued
with silicon(RTV) it is a safety
net for the work of art.

("atm{at}shore.net")
>>It is wonderful that we have many technical advantages today, both in
>>terms of software and diversity of materials used. As well as access to
>>the minds of very talented individuals such as we have on this list. These
>>things make our telescopes better in many ways and I would not want it any
>>other way. But as noted, I do feel at times that we forget that their are
>>advantages to designs and materials that are not on the cutting edge as
>>well.
>>
>>Minimal scope designs have less wind resistance which does a lot to
>>counter their being lighter in weight as well. Course if they are tarped
>>during the daytime that changes the whole equation tremendously. Those
>>observing at star parties or other locations where the scope is commonly
>>left setup have to address that problem regardless of the weight of the
>>scope. And that can be done. A lighter scope is of course easier to move
>>and some would temporarily move it to a safer location inside their
>>vehicle.
>>
>>The probability of survivability of any scope from an event such as I
>>described is not only based on design, in fairness it would be greatly
>>affected by the exact circumstances of how it landed. Only by repeated
>>crash testing (scarry thought) would one be able to make conclusions that
>>have a high degree of certainty of what would likely happen to a scope of
>>any design. Intuitively though, over engineering does afford a greater
>>comfort zone which was my point.
>>
>>One thing that I learned from my friends experience was that having three
>>mirror clips instead of only one (which I have traditionally done because
>>the other two seemed redundant) is what saved Howard's mirror from being
>>possibly broken. The OTA was laying flat on back upside down when I came
>>upon it. The mirror no longer supported in it's sling was rather now
>>supported by the upper bumper and tipped forward against the two mirror
>>retainer eye bolts attached to the lower two bumpers. Without that
>>redundancy his mirror would have undoubtedly fell forward in the box and
>>could have been scratched or possibly broken.
>>
>>Perhaps I over reacted to the comments made, after all there is nothing
>>wrong with Clive or others being very enthusiastic about what they feel!
>>My comments were only intended to balance the equation of discussion from
>>another viewpoint that I feel is also valid.
>>
>>Chuck Dethloff
>
>
>("atm{at}shore.net")
>
>   Chuck,
>
>    This is the perfect response to an ever changing "hobby"
(bad word) .
>This is a way of entertaintment
>for many people and some take the concept to the extreme, which is good for
>the inovation and engineering
>ends of the ATM'ers.  I may be wrong, but  most ATM'ers are amateurs and
>are not concerned with
>cutting edge concepts. Don't get me wrong, I love to suck in the info on
>this list, But I feel at times
>that "newbies" are intimidated by the elevation of  technical
information
>at times.
>       I am not suggesting that intellect be chained, but that we look back
>to the kid  in the back yard with
>the grin looking at the stars, and then looking back to the eyepiece seeing
>that the world is really a
>small place.  I love this list and all the people interested in the process
>of making  windows to the
>universe. My comments may fall on conjecture but my heart is with all who
>desire to explore..
>                                                     Russ Jocoy........
>("atm{at}shore.net")
>
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