Arrow spine help

[GOODWIN]

Started to shoot Dad's longbow that has been collecting dust. Thought I'd try some cedar shafts he had laying around as well. I was shooting one that had been fletched with a 145gr fieldpoint. I'm getting a severe fishtail with the tail end kicking right until about 15yards when it straightens out. I'm right handed shooting a 55# @ 28". Granted my form and release need a lot of work but trying to get the right spined arrows. Am I under or over-spined?

 

[Beekeeper]

It may not be the spline. Check your nocking point and your string alignment with your rest. Make sure you are getting a crisp / smooth release when you shoot.

 

[GOODWIN]

It may not be the spline. Check your nocking point and your string alignment with your rest.

Well I'm shooting off the shelf with just a leather pad. I don't think you can get true centershot with this bow either. I've started my knocking point about 1/8" above 90 degree. If the knocking point is off wouldn't that cause porpoising rather than side-to-side fishtailing? I'm new to the long bow so fill me in...

 

[TNtrapper]

Best way to determine spine is to put the paper up and see what its showing.With a left tail tear shows your arrow is too weak and under spined. Right tear it is overspined. Youre grouping will generally be shooting to the left too if they are overspined.

 

[sagebrush]

move your nock up or down

 

[GOODWIN]

My spine was too stiff. I ended up getting a fp test kit that came with different weight points. I found the 190gr points gave me great flight. I've sinced then ordered some ACE 2 blade BH's. Hope to get my first longbow kill soon!