roundhouse and turntable spacing

You could try the forum search feature located on the "MENU" block top left of the page. The minimum length of the roundhouse track would be what's needed to clear your longest loco/loco & tender from the TT. I don't recall ever seeing a roundhouse sitting right on the edge of a turntable, but it could be done that way I suppose. Again, the TT should be large enough to handle your largest motive power. Your roundhouse side tracks need to line up with your roundhouse door openings. It would be nice to have your TT lead in long enough to hold your largest engine.

I would eyeball some examples. 

Simon

Thanks guys.  still looking for Chuck's pfd

Steve,

Are these the pdfs you're looking to obtain?  Please note that they are principally based on the Korber roundhouse.  Other roundhouses, with differing degree of curvature at the entrance doors, will produce different results.  There have been some good turntable-roundhouse planning articles in older issues of Model Railroader.

Chuck

Steve,

there are roundhouse planning pdf’s on our website from the various manufactures  on our links page including the Korber one Chuck posted here.

here is the link to that info page: 

Roundhouse planning info

Thank you. That's what I was looking for.