Anyone with a reason for....

[anchorman]

I am having a slight problem wth my woods and broadheads. I am right handed and shooting a 125 or 145 grain field point and they hit dead on. I switch to my 145 grain brodhead and it starts shooting left like it's a stiff spine. How can this be when the field points are hitting right on and lighter weight?...Thanks

[Benny Nganabbarru]

Field points can hide incorrect spine to a large degree; broadheads can show-up a weak spine that was otherwise hidden. Can you tell us more about your set-up?

[anchorman]

Draw length around 27 1/2 pulling 57 at 28 shafts are 60-65 spine and cut 29 1/4 3 fletch with 5" feathers

[mater]

It might not have recovered yet. Even though it is left, it might be weak spine. Can you try 125 gr. broadhead? I find that broadheads make some of my arrows shoot like there weak, because the heads stick out farther. Its like a longer arrow.
    Mark

[John3]

This is why I always tune my arrows with broadheads installed.. They show exactly what is happening...

Right handed shooter with fletched arrows hitting left equals a STIFF arrow.. No doubt at all.  

You need a heavier broadhead or start over with longer shafts or increase the brace height of your bow... And then tune again..

[anchorman]

I was thinking stiff shaft but with the lighter field points hitting right on and flying good has me confused. I know doesn't take much..lol I am shootin 20 yards so I hope that is has recovered by then. I will increase the brace height a little and see what happens thanks.

[xtrema312]

Field point can shoot well to the eye and be too stiff or weak.  How about a bare shaft?  You could also be over stiff and getting a kick off the riser with the 125's.  That would make them shoot ok with FP's, but not BH's.

[mater]

With what you said about hitting well with the field points, you have another issue. Dont buy into that {gotta be such and such} There are many variasions.  If its hitting the nock on the riser, it will take alot longer to stabalize. And can also be weak. Also check alighnment of your broadheads. A crooked broadhead will never fly right. Leave us know what you find.

[Benny Nganabbarru]

Is it a real longbow, or a modern deflex-reflex hybrid, or a recurve? Is the shelf centre-cut? Are you using a low-stretch string or Dacron? I'm leaning toward your arrows being too weak.

[jarhead_hunter]

What type of broadheads are you using????

In the old days we used to experience 'wind/wing planing' where the BH would actually act like an airplane wing and cause the arrow to deflect.

It was a very common problem with 2 blade BH if I remember correctly.....

Charles.

[anchorman]

It's a recurve cut 1/8 past center with fast flight string..using snuffers..I think I have figured the problem out..I hate to admit this but when I was shooting my broadheads I was getting my head over to far a buddy of mine was watching me shoot both arrows and noticed this. It had me worried as I have had this set up for a couple of years and couldn't figure out what had happened.. I feel really stupid now..thanks guys for helping and one thing I did do was raise my brace height a 1/4 inch

[Benny Nganabbarru]

Just to run a formula past you that I use, told me by Danny Rowan:

Your actual draw weight plus five: ~55.5 + 5 = 60.5

Plus five if using low-stretch string: 60.5 + 5 = 65.5

Plus five if cut past centre: 65.5 + 5 = 70.5

Plus five for every inch of arrow over 28": 70.5 + 7.5 = 78

Plus five if using tips over 160 grains: Not applicable, remains 78

So, I'd be looking at getting shafts that are 75/80#.

A lot of fellows won't like what I've got to say, buy I honestly believe that with a modern, centre-cut recurve, there is almost no such thing as too stiff, but there is easily such a thing as too weak. Out of my Black Widow PCHx, shooting 69.5# at 29.5", I cannot tell the difference between 95/100# shafts (which the formula recommends for the 160 grain broadheads I use) and 105/110# shafts. These latter are for my 83# at 29" Schafer Silvertip, but work just as well out of the lighter bow. The sow that I shot through didn't realise that the arrow was too stiff. Too weak, on the other hand, and those arrows are all over the place.