#36192 Feb 1 5:23 AM
Our pier, construction seen here,
is about 180 cm tall. It is 300 cm diameter. The tube on our 102mm
refractor and the counterweight are often too close to the pier. The
counterweight on the 12" SCT comes even closer. In your case, t'were
me, I'd start with a diameter of 350 cm and use concrete with at least
4 full length pieces of rebar, (drilled and glued to the bedrock with
epoxy). I would get a pier extension like the metal one shown at the
above link (made by our own Rainer) for the top of the pier, so as to
afford maximum clearance for the counterweights and OTA.
Please be sure to post pictures here, and at observatory.com.
Best of Luck with your project.
--- In Losmandy_users@yahoogr
> Hi all,
> This is perhaps out of topic but have to ask:
> I'm designing a permanent observatory and if I want a long permanent
> pier let say 210cm, approx what diameter is needed (and material
> thickness)? Let say steel put into solid rock, maybe concrete filled.