Could someone recommend a wood arrow length, wood type, vendor, and spine for this set up?

Centaur Triple Carbon
50.5 lbs @ 29" draw
125 gr. front
3 5'' Shield cuts

I'm guessing I'll need the arrow to be 31'' long..

With that setup, my first choice would be Doug Fir, cut 30" BOP, spined 60-65.  That's a high performance bow, so spine may even need to be more.  If you want 31" arrows, increase spine by 5#.

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QuoteOriginally posted by Blackhawk:
With that setup, my first choice would be Doug Fir, cut 30" BOP, spined 60-65.  That's a high performance bow, so spine may even need to be more.  If you want 31" arrows, increase spine by 5#.

That will be real close!!  

I agree 100% with everyone so far.

Snag will set you up with some great arrows.

Thanks guys.

Just made up some rivercanes for my 50 lb longbow, 29,5" long, they are sturdy and and fly well, about 600 grain. Also made up some black/sweet birch about 500 grain that seem to be flying well.

I think you are gonna want more than 60 lb spine with a 31" BOP.  I believe your Centaur is cut to center and shooting a hard string which adds 10 lb.  3" of shaft is another 12-15 lb.  I would recommend 70-74.  You can always build the shalf out a bit if they aren't quite stiff enuf.

This is where a set of test arrows really comes in handy and shows its worth.

I'd recommend 65-70# tapered cedars cut 30" bop. If you're drawing 29" you shouldn't need to have them longer than 30"