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Equipment Discussions >> Mounts

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Keith Howlett
Pooh-Bah
*****

Reged: 03/06/07

Loc: Northumberland, UK
Re: Ultimate capacity yet portable mount: AP 2400GTO ? new [Re: dothead]
      #4420254 - 03/01/11 10:05 PM

Quote:

The question is, can we take the manufacturer's stated capacity as gospel ?
In the light that some are more conservative than others with their specs.

Don't want to stir a hornet's nest, but are there opinions if the Pm ME ("150lbs cap.") is as beefy as the AP1200 ("140lbs cap.) ?

As a purely visual guy, I don't like to use a labtop in the field (like the Pm ME requires).


Regards,

Ralph




Hi Ralph,

You see quite a few 20 inch RCOS mounted on Paramounts and these weigh 163 lbs without cameras and accessories. I don't think I would get away with that on my AP1200 but I think it would cope with the advertised cat/cass type 140 lbs load. (It was loaded to this level by the previous owner with no ill effects.)

Cheers,

Keith


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skybsd
Post Laureate
*****

Reged: 02/01/08

Re: Ultimate capacity yet portable mount: AP 2400GTO ? new [Re: Alph]
      #4420656 - 03/02/11 03:16 AM

Quote:

Quote:

Quote:

It is right now on sale for $12,500. It is a steal for anyone from the euro zone.




Errr., Nope, nope , and..., no

Regards,

skybsd




Sure, but he does not have to use an european dealer.





Indeed - I don't disagree with you..,

But unless such a buyer is willing to be creative - they're stuck with SB's EU distributorship's pricing

Regards,

skybsd


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dothead
scholastic sledgehammer


Reged: 08/13/08

Loc: Heidelberg, Germany
Re: Ultimate capacity yet portable mount: AP 2400GTO ? new [Re: Keith Howlett]
      #4420706 - 03/02/11 04:58 AM

Keith,

many thanks for your reply.

The question is how a mount will handle not a heavy, compact, but a "lightweight", but extremely long OTA.

While going lightweight with a long OTA (I'll use Carbon Fibre as material) sounds a good idea as far as portability of it is concerned, this also decreases the OTA's inertia against torque forces, like wind - talk about surface to mass ratio.

Guess I have to do real sound calculations to get a better idea of the matter - or better still, mount the 8" f/20 CFK refractor OTA on an AP1200 of someone else's first and see how the setup behaves...


Regards,

Ralph


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Keith Howlett
Pooh-Bah
*****

Reged: 03/06/07

Loc: Northumberland, UK
Re: Ultimate capacity yet portable mount: AP 2400GTO ? new [Re: dothead]
      #4422208 - 03/02/11 07:15 PM

Hi Ralph,

That's understood and it's a question for the good people at Astro-Physics. They are very helpful, it would be worth a phone call.

Cheers,

Keith


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Duncan Kitchin
Pooh-Bah


Reged: 12/16/04

Loc: Beaverton, OR, USA
Re: Ultimate capacity yet portable mount: AP 2400GTO ? new [Re: Alph]
      #4422674 - 03/02/11 11:10 PM

Quote:

Quote:

Quote:

It is right now on sale for $12,500. It is a steal for anyone from the euro zone.




Errr., Nope, nope , and..., no

Regards,

skybsd




Sure, but he does not have to use an european dealer.




I'm not so sure about that - buying from outside of Europe and having it shipped can be expensive - particularly if customs stop the package in transit (becomes more likely with large packages) and demand the payment of 20% VAT...

Regards & Clear Skies
Duncan


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RogerRZ
Whatta you lookin' at?
*****

Reged: 01/09/06

Loc: West Collette, NB, Canada
Re: Ultimate capacity yet portable mount: AP 2400GTO ? new [Re: Duncan Kitchin]
      #4423402 - 03/03/11 09:49 AM

One also has to put himself in a mount manufacturer's shoes.

Is there a market for a mount that can handle an 8" f/20 refractor. I don't know how many are actually out there, and of them how many of them would spring for a $20000 mount?


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dothead
scholastic sledgehammer


Reged: 08/13/08

Loc: Heidelberg, Germany
Re: Ultimate capacity yet portable mount: AP 2400GTO ? new [Re: RogerRZ]
      #4423818 - 03/03/11 12:53 PM

yes of course, nothing to be said against this.

But let's consider you own a CDK 20 at a private observatory.

The AP 1200 (capacity 140lbs) would struggle with this scope (140lbs OTA) and auxilliary equipment.

The AP 3600 (capacity 300+lbs) would seem to somehow be "overkill" for this setup.

The "AP2400" (capacity 200ish lbs) would be the ideal mount for this scope, and cost less than the 3600.


Regards,

Ralph


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wz2
Most Boring Astronomer...


Reged: 07/30/10

Re: Ultimate capacity yet portable mount: AP 2400GTO ? new [Re: dothead]
      #4424572 - 03/03/11 07:12 PM

I don't think any manufacturer wants to proliferate mounts in this price/capacity range. There's just not a big enough market.

Plus you're talking "private observatory" and CDK20 class instruments. A CDK20 is $32k for the scope alone. What's a comparable aperture RCOS go for, $50k? With scope, mount, dome, etc you're easily looking at rigs in the $100k range +.

I suspect the price difference between a hypothetical "AP2400" and the AP3600 would be relatively immaterial to a player in this range. Hence, not much motivation for AP to market one.

Just my opinion.

Chris


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dothead
scholastic sledgehammer


Reged: 08/13/08

Loc: Heidelberg, Germany
Re: Ultimate capacity yet portable mount: AP 2400GTO ? new [Re: wz2]
      #4424694 - 03/03/11 07:58 PM

so, the poor ol' 8" f/20 refractor...

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wz2
Most Boring Astronomer...


Reged: 07/30/10

Re: Ultimate capacity yet portable mount: AP 2400GTO ? new [Re: dothead]
      #4424780 - 03/03/11 08:36 PM

Ralph,

Won't this 8" f/20 scope create quite the torque moment arm across your broad German shoulders as well? It will be at least 14' long I'm assuming. You're looking for a portable mount so I'm thinking the whole set up will be portable, including scope?

Chris

ps Been to Munich - drank beer at Oktoberfest (lots) - it was fun


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dothead
scholastic sledgehammer


Reged: 08/13/08

Loc: Heidelberg, Germany
Re: Ultimate capacity yet portable mount: AP 2400GTO ? new [Re: wz2]
      #4424818 - 03/03/11 08:57 PM

will transport tube and lens separately... (get modular!)

shall be "movable" until I'll manage to build a home for it...

it can be done (see Ziggy's 9" f/15 Clark).

done too many tracks in Nepal and have seen the Sherpas strut their stuff...


Ralph

Edited by dothead (03/03/11 08:59 PM)


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wz2
Most Boring Astronomer...


Reged: 07/30/10

Re: Ultimate capacity yet portable mount: AP 2400GTO ? new [Re: dothead]
      #4424853 - 03/03/11 09:21 PM

Ralph,

Won't this thing also need a rather large (tall) tripod or pier to keep the focuser / eyepiece from scraping the ground?

Chris

Trekked Nepal myself. Flew into Lukla (before they paved the runway). I'm dating myself.


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dothead
scholastic sledgehammer


Reged: 08/13/08

Loc: Heidelberg, Germany
Re: Ultimate capacity yet portable mount: AP 2400GTO ? new [Re: wz2]
      #4425915 - 03/04/11 01:39 PM

yes - I'll go for a height-adjustable pier (ala Pier-Tech), offered by a local company (normally for industrial applications):

minimum height: 60"
maximum height: 100"

With the additional 15" height of the mount, the eyepice will be about 25" above the ground when OTA is pointed at zenith.



Regards,

Ralph

Edited by dothead (03/04/11 01:43 PM)


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