Just how "flexible" are your carbon shafts with different tip weights?

[threeunder]

I've been doing a lot of experimentation lately with 30" CE Heritage 150's and 250's.
With the 250's out of my #55 @ 28 K-Mag pulled at 28.5" (B-50 string), I'm getting good arrow flight with everything from 175 gr. up through 250 gr.
Just wondering if this "flexibility" in tip weight is what everyone else is seeing.
Ken

[Matt Green]

i havn't played with dif tip wts alot but what little experimenting i've done has lead me to believe that it take a LOT of wt to break down a carbon arrow. However, cutting the least bit adds more stiffness than one woudl ever think.
mg

[SS Snuffer]

Matt has got right!

[RUTANDSTRUT]

my tuning and testing shows that the length of the arrow has more influence on tuning than the actual tip weights.

[Wally Dye]

I have been messing with this for a while.  I got into bareshafting and had a Centaur Carbon Elite that spoiled me.  It would bareshaft "darts" at 30+ yards.
I've been messing with others and got some new shafts.  Since switching to carbons it has become more difficult to "trim" than my aluminums.  I sent an email off to Stu Miller about spine calculations.  I need to get some 340's tuned to an ACS.  Basically Stu told me that a 25 grain change in point weight on my carbon 340's is equivalent to 1" arrow length change (adding weight effectively reduces spine).  I got a set of "tuning points", figured a way to use them so I didn't need to glue in the inserts and it seems to work.  This is for bareshaft testing.  Some well mounted feathers I'm sure can overcome some decent variances in point weight but, I've been looking to get what Stu recommends with bare shafts, then with feathers, the flight will be sweet.
Since adding the feathers increases arrow "spine" he recommends tuning to slightly weak.   I have a question in for him now since he indicated that the feather weight is the key factor. If it is just the weight, I am thinking about adding some tape to the rear of the arrow equal to the weight of the feathers.  That way, I can tune for a "straight in" arrow, take off the tape, put on the feathers and theoretically it should work.
BTW (I'm sure lots of guys use this but, I never read about it) for tuning now, I screw my point into my insert, slide it into the arrow, put a wrap of electricians tape (or whatever is closest) around the shaft and point/insert and I can now try different test weights to get a ballpark idea of where I need to go with the arrow length.
Another kicker is where the riser is cut.  My ACS is 3/16" past center (makes it want stiffer spined arrows) so to get 340's without going too short, I had to shim it to just about center (did this once with an ILF riser, a piece of an old belt measured .140" or just a bit less than 3/16).  This turned a bow that wanted a 28" 340 with my 125 gr tip into a bow that is now happy with a 30" arrow and I won't have a broadhead "caressing" my bow hand.
Longwinded.  Hope it helps someone.

[reddogge]

For a hunting arrow I start out with the weight of the broadhead and insert and then tune the arrow to that weight. I use the same weight field point as close as I can.

[CRS]

I know while tuning arrows I can walk the bareshafts across the target face with different weights.  I have seen as much as 36" in horizontal POI.  I do not know what that means as far as measurable arrow flexing though.

I agree with Matt, cutting a little makes a huge difference with carbons.

Lately I have been doing what reddogge does.  I pick the weight I want to use and tune the arrows to tip weight cutting them 1/4" at a time.

I screwed up with some Easton Axis Nanos.
1.  In my experience, they differ in MFX's. I have found that the dynamic spine is stiffer for same length arrows.

2.  I accidently cut an extra 1/2" off while making up some arrows.  I know, measure twice, cut once.  I wanted to use 146-170 grain tips.  But I ended up having to go up to 300gr in one bow and 225gr in another to m ake up for the 1/2".  The total arrow weights ended up at 700 and 625 respectively.  I was trying for mid  500gr total arrow weight.

[katman]

The closer a bow is to center shot the more forgiving of spine it may be.

Ken, how are you tuning?

[hunt it]

My findings are: that fat carbons are alot more forgiving with different weight tips and also different bow weights as well. The skinny carbons tend to give me alot less variance.

A GT 55/75 shoots out of bows from 54# to 74# and the 250 FMJ or 340 axis tends to be very fussy about what weight bow and tip. I find I need different skinny shafts for each weight bow to tune perfectly. Whereas that fat shaft will fly good out of 3 or 4 bows of different weight and tip weights.

[JRY309]

I feel the length of a carbon and how close to center the bow has will make it more forgiving.I bought some used carbons years back that was 1" past my draw.They were showing alittle too stiff.So I thought I could add more weight to weaken the spine.But the more weight I added the worse they got.This was on a longbow cut 1/8" off center.They were in effect bouncing off the riser instead of flexing around it.