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Anyone with a GSO style 10” Truss RC… Can you help?

Sky-Watcher EQ6-R Pro Equatorial Mount Acquisition Deep Sky
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John Stone avatar
John Stone avatar
Here's a measurement that would really help me out.   

I need to calculate the distance from the frontmost top tip of the spider horizontally to the center of the RA axis when the scope is balanced on a mount with a normal mono APS-C camera setup (OAG, Filter wheel, camera)

Then I need the vertical distance from the top of the losmandy plate to the stopping point of the above measurement.

This will let me add my mount's center of RA axis to top of saddle to the second measurement then calculate the hypotenuse of right triangle these 2 measurements describe.

I need the distance in the following diagram.   My EQ6-R is 8" from center of RA to top of saddle.

tsk1979 avatar
tsk1979 avatar
Are you looking at Starfront?
If so, join their discord. IIRC, 10" RC's are standard Pier 299$. 

There are a couple of 10" folks there. The lite 199$ pier is about 8" Edge max. Once you hit 10" you are looking at standard piers.
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John Stone avatar
John Stone avatar
Yes, that’s the place.   

I’m ordering a Trident GTR (for the published guide spec of 0.15 rms - 0.3 rms) and it’s on the big side 8 3/4” from center of RA axis to top of saddle so I want to be sure they’ll take it before I order and send $10k worth of kit out there.  To me it would only be useful to have such things permanently on a pier somewhere.

I’m on their discord and have sent emails to their customer service address but have yet to hear a reply so I thought I’d see if someone could measure an actual scope for me because as far as I can tell it’s going to be close to the limits.

So if anyone has one and could carefully measure it out (+/- 1/2”) I would greatly appreciate it.
tsk1979 avatar
tsk1979 avatar
There is a Starfront Group, you can ask there. you can also ask around in community support channel the same question and see if any user sees that.
David Russell avatar
David Russell avatar
John, I have an RC 10, but to be honest I cant understand what your question is.

I cant do complicated maths at all ,but I can use a ruler.

what are you actually trying to figure out ?
John Stone avatar
John Stone avatar
David,

Can you measure the following 4 lines for me (orange, red, pink, yellow)

Please notice that the orange and red lines form a 90 degree angle.

Thanks so much.

David Russell avatar
David Russell avatar
I will measure this for you tomorrow John.  its dark out there now and I am shooting.
David Russell avatar
David Russell avatar
Hi John. its difficult to get exact measurements in these dimensions but I have tried.

1. the Pink Line is about 205mm. this measurement is exact,
2. the yellow line measures about 775mm. this could be plus or minus 10mm

3. the brown line is in the vicinity of 500mm. this could be plus or minus 30mm
4. the red line is in the vicinity of 370mm. this could be plus or minus 30mm.

the total distance for the Red and Pink are approximately 575 but this is an estimate.

of the 4 measurements

1 is the most accurate.
2 is reasonably accurate.
3. less accurate
4. same as 3 above.

I tried to use hypotenuse on a triangle maths to work it out, but the result numbers did not add up right, so I know some dimensions are not perfect. I am no good at maths anyway ,but these were the dimensions I could measure.

let me know if you want me to measure things again.

Dave
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David Russell avatar
David Russell avatar
John Stone:
David,

Can you measure the following 4 lines for me (orange, red, pink, yellow)

did the measurements help John ?
John Stone avatar
John Stone avatar
did the measurements help John ?



yes, thank you.  775mm is about 30 1/2” which is sad for me because I need it to be 29” or less to fit on a pier at my remote observatory.