Showing posts from November, 2014

Thinking of a telescope rebuild

20 years ago, I built Big Blue:

It's been a great telescope.  But it is, well, big.  About 120 145 pounds, hard to take apart, hard to transport.  I've been reading up on alternative designs, and I came across this one by legendary Mel Bartels.  Here is my take on it.  A very light scope, easy to disassemble, and easier to transport.  First, the assembled scope:

It will easily disassemble and fold up for transport:

And the plywood bits will all fit on a single standard 4x8 sheet:

I'm not sure when I'll get around to building it, but it is fun to think about.

Edit (Nov 10 2014): I started disassembly, and found that the scope is actually 20% heavier than I realized (and includes 25 pounds of counterweights).  From initial estimates, the new design will weigh:

Upper cage: 6 pounds (was 11 pounds)
Mirror box: 46 pounds (was 53 pounds)
Rocker box: 30 pounds (was 41 pounds)
Counterweights: 8 pounds (was 25 pounds)

Overall, a 35% weight diet.  The mirror box/mirror combo is…