[ap-gto] Re: 600 GTO payload capacity


Feb 29 6:27 PM

 


----------------------------

#307 Feb 29 6:27 PM

While waiting for our Biblical sequence of rain

storms to pass here in the San Francisco Bay area I've

taken to idle speculations...



Anyone care to speculate why the 600 series mount is

is rated to carry a SCT size of 10 inches max where as

the Losmandy G11, which is not that much different in

size, routinely carries C14's ?



Lets limit the discussion to visual applications only.



*sigh* back to polishing my counter weights...



-Doug



USPS: Douglas W. Forehand INTERNET: dwf@...

Sun Microsystems Inc. VOICE: (408) 774-8015

901 San Antonio Road, MS USUN02-101 FAX: (408) 774-2098

Palo Alto, California 94303-4900



----------------------------

#308 Feb 29 6:52 PM

"Douglas W. Forehand" wrote: >

> Anyone care to speculate why the 600 series mount is

> is rated to carry a SCT size of 10 inches max where as

> the Losmandy G11, which is not that much different in

> size, routinely carries C14's ?

>

> Lets limit the discussion to visual applications only.



Hi Doug:



Here are the specs, although it is hard to compare since two

manufacturers may rate their mounts differently.



Eq. Head wt..Rating



Losmandy GM-8.21#..30# ?8" SCT

AP 400..21#..? 8" SCT

AP 600..27#..? 10" SCT

Losmandy G-11.36#..60#

AP 900..40#..70#

AP 1200..91#..140#

HGM 200..97#..150#



The G-11 is a pretty hefty mount, closer to the 900 in size.



Derek



----------------------------

#310 Feb 29 10:46 PM

A C14 on a G11 mount is quite stable for visual use.



Rich



>Hi everyone;

>

>I think that ratings such as this are to be taken with the proverbial

>grain of salt. They are really just guidelines. People differ in the

>priorities they assign to minimizing weight and cost on the one hand,

>versus greater stability on the other. Manufacturers rarely state the

>criteria they use in their ratings. One European manufacturer goes

>assigning weight capacities for different telescope weight and tube

>length combinations. Company 7 sells the Losmandy G-11/Celestron 11 as

>a combined package and suggests a C-11 is the maximum this mount can

>handle effectively. They say this combination may be on light side for

>Astro-photography. Nonetheless, many people have taken great images

>with this setup. I used to own a Losmandy GM-100, which was the G-11's

>predecessor. Even though the GM-100 was more robust than the current

>G-11, I think a C-14 would have been too much for it.

>

>doug.forehan-@...> wrote:

>

>original article:www.egroups.com/group/ap-gto/?start=307

>> Anyone care to speculate why the 600 series mount is

>> is rated to carry a SCT size of 10 inches max where as

>> the Losmandy G11, which is not that much different in

>> size, routinely carries C14's ?

>>

>

>

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----------------------------

#312 Mar 1, 2000

No way, the 900 GTO is much much larger then the G11. I have owned both

mounts and I would put the G11 at the 600E size, Definatly not in the same

league as the 900 gto. I have owner both mounts and have used the same size

scope on them and the 900 is significantly more stable and load capacity and

in every way more then the G11....though the 600E and the G11 (while I would

lean on the 600E greater) is a much more reasonable comparison.



charles

----- Original Message -----

From: Derek Wong dawong@...>

To: ap-gto@egroups.com>

Sent: Tuesday, February 29, 2000 9:52 PM

Subject: [ap-gto] Re: 600 GTO payload capacity





> "Douglas W. Forehand" wrote:

> >

> > Anyone care to speculate why the 600 series mount is

> > is rated to carry a SCT size of 10 inches max where as

> > the Losmandy G11, which is not that much different in

> > size, routinely carries C14's ?

> >

> > Lets limit the discussion to visual applications only.

>

> Hi Doug:

>

> Here are the specs, although it is hard to compare since two

> manufacturers may rate their mounts differently.

>

> Eq. Head wt. Rating

>

> Losmandy GM-8 21# 30# ?8" SCT

> AP 400 21# ? 8" SCT

> AP 600 27# ? 10" SCT

> Losmandy G-11 36# 60#

> AP 900 40# 70#

> AP 1200 91# 140#

> HGM 200 97# 150#

>

> The G-11 is a pretty hefty mount, closer to the 900 in size.

>

> Derek

>

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> Shop the web for great deals. Save on Computers,

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>







----------------------------

#313 Mar 1, 2000

Hi Charles,



I like the 900GTO too, I bought one. But the G11 is

amazingly stable even with a C14. Maybe it has more

to do with the Losmandy semi-pier and tripod.



Rich



>No way, the 900 GTO is much much larger then the G11. I have owned both

>mounts and I would put the G11 at the 600E size, Definatly not in the same

>league as the 900 gto. I have owner both mounts and have used the same size

>scope on them and the 900 is significantly more stable and load capacity

and >in every way more then the G11....though the 600E and the G11 (while I

would >lean on the 600E greater) is a much more reasonable comparison.

>

> charles

>

>----- Original Message -----

>From: Derek Wong dawong@...>

>To: ap-gto@egroups.com>

>Sent: Tuesday, February 29, 2000 9:52 PM

>Subject: [ap-gto] Re: 600 GTO payload capacity

>

>

>> "Douglas W. Forehand" wrote:

>> >

>> > Anyone care to speculate why the 600 series mount is

>> > is rated to carry a SCT size of 10 inches max where as

>> > the Losmandy G11, which is not that much different in

>> > size, routinely carries C14's ?

>> >

>> > Lets limit the discussion to visual applications only.

>>

>> Hi Doug:

>>

>> Here are the specs, although it is hard to compare since two

>> manufacturers may rate their mounts differently.

>>

>> Eq. Head wt. Rating

>>

>> Losmandy GM-8 21# 30# ?8" SCT

>> AP 400 21# ? 8" SCT

>> AP 600 27# ? 10" SCT

>> Losmandy G-11 36# 60#

>> AP 900 40# 70#

>> AP 1200 91# 140#

>> HGM 200 97# 150#

>>

>> The G-11 is a pretty hefty mount, closer to the 900 in size.

>>

>> Derek

>>

---------------

>> Shop the web for great deals. Save on Computers,

>> electronics, Home furnishings and more.

>> click.egroups.com/1/1559/2/_/3615/_/951879164/

>>

>> -- 20 megs of disk space in your group's Document Vault

>> -- www.egroups.com/docvault/ap-gto/?m=1

>>

>>

>>

>

>

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----------------------------

#314 Mar 1, 2000

Date: Tue, 29 Feb 2000 23:52:34 -0800

> From: "Steve Leikind" sleikind@...>

>

> I think this is a matter of personal preference. My experience has

> been that a G-11 is adequate with a Meade 12" SCT OTA provided there is

> no wind. However, in light to moderate wind, there is too much

> vibration for my taste. On the other hand, if I used this combination

> in an observatory sheltered from wind -- maybe.

>

> "rich n." rnap-@...> wrote:

>

> > A C14 on a G11 mount is quite stable for visual use.

> >

>



So does anyone believe there is cause for concern about the long

term reliability of the motors and bearings in either the G11

or the AP600GTO when loaded with the mass of a C14 + counterweights ?



-Doug



USPS: Douglas W. Forehand INTERNET: dwf@...

Sun Microsystems Inc. VOICE: (408) 774-8015

901 San Antonio Road, MS USUN02-101 FAX: (408) 774-2098

Palo Alto, California 94303-4900



----------------------------

#315 Mar 1, 2000

>

>> > A C14 on a G11 mount is quite stable for visual use.

>> >

>>

>

>So does anyone believe there is cause for concern about the long

>term reliability of the motors and bearings in either the G11

>or the AP600GTO when loaded with the mass of a C14 + counterweights ?

>

>-Doug





Why push a very nice, not inexpensive, mount like

the AP600GTO by loading it down with a C14?



Once when I wanted to compare my old AP 152mm f/9

StarFire to my new AP 155mm f/9 EDT StarFire, I mounted

the older StarFire on Celestron SP mount. With extra weights

and careful balancing the SP motors drove the big OTA

very nicely.



Apparently the G11 is designed to take a heavy load. It is

also relatively inexpensive. If I couldn't afford one of the larger

AP mounts I would feel much better taking a chance with the

less expensive G11.



Rich



----------------------------

#316 Mar 1, 2000

From: "Rich N." rnapo@...>

> Date: Wed, 1 Mar 2000 14:50:49 -0800

>

> >>

> >> > A C14 on a G11 mount is quite stable for visual use.

> >> >

> >>

> >

> >So does anyone believe there is cause for concern about the long

> >term reliability of the motors and bearings in either the G11

> >or the AP600GTO when loaded with the mass of a C14 + counterweights ?

> >

>

>

> Why push a very nice, not inexpensive, mount like

> the AP600GTO by loading it down with a C14?



I agree.

As far as me and my 600GTO are concerned its an academic question.

>

> Apparently the G11 is designed to take a heavy load.



That is my understanding as well. However being an engineer I'm

interested in what design features Losmandy optimized (bearings,

high torque motors,...). So far all I've heard leads me to the

conclusion that there really isn't a significant difference between

the CAPABILITIES of the mounts; just their specs.

> It is also relatively inexpensive. If I couldn't afford one of the

> larger AP mounts I would feel much better taking a chance with the

> less expensive G11.



Although the GOTO G11 is none too cheap at $3595.



-Doug



USPS: Douglas W. Forehand INTERNET: dwf@...

Sun Microsystems Inc. VOICE: (408) 774-8015

901 San Antonio Road, MS USUN02-101 FAX: (408) 774-2098

Palo Alto, California 94303-4900







----------------------------

#317 Mar 1, 2000

> From: "Rich N." rnapo@...>

>> Date: Wed, 1 Mar 2000 14:50:49 -0800

>>

>> >>

>> >> > A C14 on a G11 mount is quite stable for visual use.

>> >> >

>> >>

>> >

>> >So does anyone believe there is cause for concern about the long

>> >term reliability of the motors and bearings in either the G11

>> >or the AP600GTO when loaded with the mass of a C14 + counterweights ?

>> >

>>

>>

>> Why push a very nice, not inexpensive, mount like

>> the AP600GTO by loading it down with a C14?

>

>I agree.

>As far as me and my 600GTO are concerned its an academic question.

>

>>

>> Apparently the G11 is designed to take a heavy load.

>

>That is my understanding as well. However being an engineer I'm

>interested in what design features Losmandy optimized (bearings,

>high torque motors,...). So far all I've heard leads me to the

>conclusion that there really isn't a significant difference between

>the CAPABILITIES of the mounts; just their specs.



Not true. The only load specs for 600 say it will take certain sized

OTAs. The Cas rating is 10". The G11 is/was sold with C14s.

A C14 is quite a bit more of a load than a 10" Meade SCT.

>> It is also relatively inexpensive. If I couldn't afford one of the

>> larger AP mounts I would feel much better taking a chance with the

>> less expensive G11.

>

>Although the GOTO G11 is none too cheap at $3595.





Ok, for the GOTO model, but I have virtually zero interest in GOTO.

The standard G11 can be purchased for about $2k USD.



Rich



>

>-Doug



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