Home › Forums › Bows and Equipment › New Blackwidow PSR III. Tunning problems

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    • javier
      Member
        January 29, 2013 at 9:40 am
        Post count: 4
        #5081

        Hi, I´ve just received my new BW PSR III T/D 60″ 60# @30″.

        I have some problems tunning my arrows.

        I’ve used the bare shaft test, and my CE Heritage 350 has always flight weak, cutted to 31.5″ and 100gr field points.

        I have problems of clearance too. When I’ve shot fletched arrows, hen feather strikes my hand.

        You can see the photos where the arrow is hitting the shelf and my hand.

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      • Stephen Graf
        Moderator
          January 29, 2013 at 11:33 am
          Post count: 2429
          #37105

          You might look at raising the nocking point on the string. Can’t tell from the pictures, but if it is hitting the shelf and your hand, it is probably too low.

        • javier
          Member
          Member
            January 29, 2013 at 2:58 pm
            Post count: 4
            #37279

            The problem was that I need a second nock under the arrow.

            Now bare shafts fly really stright!

          • javier
            Member
            Member
              February 4, 2013 at 5:39 pm
              Post count: 4
              #44674

              I have finally tunned my bow and arrows. They fly pretty well with CE Heritage 350 31’5″ 200gr point. The bow a brace height of 7″. The problem is that I need a nock height of 1″ to get a correct bare shaft flight, and I think it could be too much. I shoot 3 under, and the bow was ordered on that way.

              So at this moment there aren’t any problems with the weakness of my arrows. Shooting this bare shafts, I need to rise my nock to 1″ offsquare because the tail of the arrow was always down. But I think 1″ is too high.

            • Stephen Graf
              Moderator
                February 5, 2013 at 12:30 pm
                Post count: 2429
                #45659

                Those 350’s might be a bit over spined. I’m surprised you are getting good arrow flight at all. If you try a weaker shaft, or add a couple hundred points to the end, you might be able to lower your string nock set.

              • javier
                Member
                Member
                  February 5, 2013 at 2:39 pm
                  Post count: 4
                  #45767

                  Steve Graf wrote: … add a couple hundred points to the end, you might be able to lower your string nock set.

                  I´m sorry, but don’t understand what do you mean.

                  I’m using a 125gr field point and 70 gr brass inserts.

                  Is there a relationship between the weight of the point and nock height?

                  Thanks

                • Stephen Graf
                  Moderator
                    February 7, 2013 at 12:51 pm
                    Post count: 2429
                    #47986

                    Firstly I didn’t check my typing in the previous post. I said “a couple hundred points” when I meant a couple hundred grains.

                    If you move the arrow up the string, you are changing how the bow casts the arrow. You can compensate for incorrect spine by moving the arrow up or down the string. Usually, if you move the arrow farther up the string you compensate for an underspined arrow. But that’s not always the case. I am just guessing, but I think you still need more weight to make that arrow fly right.

                    But if it was me, I’d get a weaker arrow and start over. By the time you get those 350’s flying right they will be heavier than the bow….

                    Those 350’s are thicker than 250’s as well. Which pushes them away from the riser and means they need to have a weaker spine to fly right.

                    But you are there, not me. So take these words as not worth much.

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