[hara]

I refrained from replying to the thread earlier because I thought I was missing something.

I'm not understanding, what is so special about this block? :shrug:

The surface area to volume ratio is poor. There are no fins or channels inside the block. I'm afraid that comparing it to a comercially available block will yield results that will not be great at all. I think good aircooling would beat your block (by good I mean reeeeally good, and a bit noisy).

One might argue that this block is simple to make, but so is a #rotor block.

With a hacksaw and drill, I've demonstrated that a cathar clone could be easily done (will not perform as good as cathar's, obviously).

Graystar, with a flat design, you will hit the wall too early. Optimisation will only yield a couple more degrees. Listen to the experts, don't expect to know everything from the start, they know what they're saying.