Sounds like you may already have some other track in use? If so, what? By straight, do you mean the tail track?
If you are using Atlas Code 55 sectional track, you can use the 30.61" radius 11.31 degree section, but you will have two possible issues: 1. there will be a reverse curve on each leg of the wye, so a speed limit is in order 2. straight track separation will be about 2.5" - you'll have to decide if that's a problem. George
Not sure how your question regards track code? As for track arrangement brainstorming, I highly recommended one of the free track planning programs. They let you fiddle around with track pieces and get a fair idea of what fits and what doesn't. Sent from the magical mystery box
I think that you are looking for a #5 switch this will bring you back straight again. Otherwise use flex track.
Yah... wyes angles are half of that of a typical turnout since there are two curves involved instead of just one. A #2.5 wye equals a #5 turnout, a #4 wye would equal a #8 turnout, etc.