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Unboxing New Explore Scientific 10" Truss Dobsonian Reflector

dob reflector
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#101 Eddgie

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Posted 25 January 2019 - 11:14 AM

I did not see it mentioned in this tread, but did anyone provide the weight of the assembled truss assembly?

 

The ES web page says it is 44 lbs, but that seems high.   My Orion 12" only weighs 50 lbs.  Is it really that heavy?



#102 Starman1

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Posted 25 January 2019 - 01:21 PM

Weights picked up from reviews on 10" ES truss tube dob:

Mirror box only  30.8 lbs

Rocker box only 14.8 lbs

Trusses, trunnions, and UTA 13.7 lbs

Complete OTA 44.5 lbs

Complete telescope 59.3 lbs



#103 Eddgie

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Posted 25 January 2019 - 08:07 PM

Weights picked up from reviews on 10" ES truss tube dob:

Mirror box only  30.8 lbs

Rocker box only 14.8 lbs

Trusses, trunnions, and UTA 13.7 lbs

Complete OTA 44.5 lbs

Complete telescope 59.3 lbs

Thank you.  That is consistent with the published specs.

 

I am just surprised that the full up OTA weighs almost as much as my 12" truss dob OTA. 

 

Again, my thanks for confirming the specs.


Edited by Eddgie, 25 January 2019 - 08:07 PM.


#104 Dana in Philly

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Posted 26 January 2019 - 08:10 AM

Yeah, like I said earlier, I dunno why they call it an "ultralight." The marketing folks must've dreamed that up.

 

Packs up pretty compact, though.


Edited by Dana in Philly, 26 January 2019 - 08:30 AM.


#105 Dana in Philly

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Posted 26 January 2019 - 08:24 AM

1/25/19 after-action report: last night it was clear, in the low 20s, with a 9 degree dewpoint. So, nice and dry.
And my neighbors have finally brought their Christmas decorations in (including the mind boggling 12 foot illuminated inflatable Minion). And the seeing here in the Delaware Valley was pretty dang good, good enough to use the ES 4.5mm 52° effectively. With the seeing and the new light shrouding I could resolve six stars in the Trapezium, up two from my usual four. Sirius B was visible. I could resolve Sirius, Betelgeuse and others to Airy disks. I lasted two hours before cold hands and feet brought me in.

 

The Orion Nebula is so spooky as it drifts by in the eyepiece.

 

Good stuff.


Edited by Dana in Philly, 26 January 2019 - 12:32 PM.

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#106 iKMN

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Posted 26 January 2019 - 12:22 PM

Yeah, like I said earlier, I dunno why they call it an "ultralight." The marketing folks must've dreamed that up.
 
Packs up pretty compact, though.


I’m right there with you and my 10” ES. It’s not ultra light at all. It replaced my 12” LB though for the reason you mentioned. “Packs up pretty compact“

I’m going with the ES 16” this summer but I’m keeping my 10” too.

Really like your thread and all your mods btw Dana.

K

#107 Starman1

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Posted 26 January 2019 - 02:05 PM

Obsession has a name for theirs: "Ultra-Compact".  Doesn't mention weight.

ES should take a tip from that.


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#108 DNA7744

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Posted 04 March 2019 - 10:45 AM

I just wanted to put a "Thanks" into this thread!  I just purchased an ES 12 Truss...and the thread really helped a lot in setting up the scope the first time.  The instructions were a little difficult to follow the first time!  Thanks again!



#109 Dana in Philly

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Posted 04 March 2019 - 05:29 PM

Speaking as the OP, you're welcome. Thanks to everyone who commented and contributed information.

 

For me, the most tense part of assembly is attaching the UTA to the trusses. (Perhaps this is a truism for truss dobs.) Riffing on DSN's suggestion (see back in the thread a bit), I made little dime-sized discs out of plastic milk jug material, with a center-hole punched in each, to collect the trusses together and hold each pair in place for the UTA. Stick the attachment bolt through the truss pair, then through the milk-jug disc, the pair stays together while you position the UTA; then screw the bolt into the UTA attachment bracket.

 

The little milk-jug discs can go whizzing off into the air when you disassemble (zing!), so this isn't yet a perfect solution for me.

 

You'll find that a shroud helps to gather the trusses as well (and improves contrast). Shrouds by Heather highly recommended!

 

Enjoy the scope.


Edited by Dana in Philly, 04 March 2019 - 06:09 PM.

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#110 Dana in Philly

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Posted 20 April 2019 - 05:05 PM

Addendum!

 

My hack (kludge?) to replace the stock hockey puck altitude tensioners, which I found not to work all that well. I ordered four of these M6 25mm knurled knobs from Amazon:

 

20190420 140143

 

Then bought four window latches from the hardware store,

 

20190420 140150

 

put a double layer of self-adhesive cork furniture sliders on one side, thus:

 

20190420 140159
 
and now I have four of these little assemblies which can be installed in the rocker box to press against the sides of the altitude wheels:
 
20190420 140335
 
which can be tightened down as needed, to retard, or even halt the altitude motion.
 
Cheap, and works well. Very useful for low angles when using a lot of glass on the focuser. I may try other materials than cork, and other thicknesses, until I get this to what I think is a happy optimum.

 


Edited by Dana in Philly, 20 April 2019 - 05:29 PM.



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