Corkscrewing arrows?

[Cromm]

Hi,
A guy I know has just made some new arrows. They are to the same spec as his other arrows in weight,spine,length and feathers. The only diff is the colour of the nock but it is still the same make.
Well the older arrows shoot just where he is look no worries but the new ones corkscrew as they fly. I've checked the arrows and have no idea why they would behave like this. Any ideas?

The arrows are wood by the way.

[Lefty]

Is he sure that they are spined the same as the others?  Is he able to spine check some from each group, or just those were the size shafts he ordered both times?  Because it really sound like they are different spine and maybe where every he got the shafts, mis-marked or mis-sent a heavier spine, or he mis-ordered.  
 If everything is truely the same then I would check the nock point on his string and make sure that it hasn't moved down and he is getting contact with the shelf on the shot.  Also can double check brace height.  But if he can shoot new and old side by side and only the new ones corkscrew, then it has to be the arrows.

[Whip]

Are they wood arrows?  Did he orient the grain correctly?  That can sure make a big difference.

[Jim Wright]

Check the nocks to be sure they are not excessively tight on the serving.

[Pat B]

Flip the arrows over so the cock feather is in towards the bow and give them a try. Sometimesthis works.

[Cromm]

Thanks for replying everyone. Will past on info and see what can be done about the wooden arrows.

[30coupe]

Is the cock feather a different color than the hen feathers? Sometimes that can give the appearance of cork screw flight even though the arrows are actually flying fine. I've had this happen myself. I replaced the cock feather with one of the same color as the hens and they straightened right out. It's just an optical illusion.

[Cromm]

Hi,
No all the same colour.
Thanks for your time

[slowbowjoe]

I asked the same question a few months back, got a ton of feedback. Search "arrows corkscrew in flight".
My problem was largely due to stiff spine (added lots of point weight), and tuning brace height and nock height.
Still not great flight with those carbons, but much improved.

[T Lail]

my daughter just had the same issue, and it turned out to be tight nocks on the string.....took a nail file and a few stokes later.....darts......(also a low nocking point may cause some cork screwing)

[creekwood]

Here is a photo of an arrow that corkscrewed in flight every time......

[chanumpa]

You have alott of great advise here so far.My advise is to respine test the new ones.I dont trust shafts untill I have spinned them myself.It just is what it is.Then,put your arrow on the nock,hold bow facing the floor,hoit string with a decent slap.Did the arrow fall off the string,or just hang on the string?I want mine to have fell off.Not too easy of course,but not to have hung on.If the hung on get the nail file out.Wa.State champ and 9year black bear record holder taught me this 32 years ago.

[Cromm]

Thank you everyone for the info and help. Will go see him today in the day light and use some of the replies to work out what could be wrong.