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Post by BT on Feb 11, 2009 7:18:51 GMT -5
Birds of a feather ;D Yup....thats close enough  |
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Post by Doegirl on Feb 12, 2009 1:13:31 GMT -5
Birds of a feather ;D Yup....thats close enough Hmmm, I'm not too sure about taking a grinder to those broadheads. Reason being is my lack of confidence in actually being to reshape those heads and reset the bevel with any sort of precision. When it comes to stuff like this I just suck.  I would much prefer to use these heads as is. |
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Post by Doegirl on Feb 16, 2009 1:57:37 GMT -5
I found the courage to put broadhead to grinder and was pleasantly suprised. Not as painful as I envisioned it to be. I'm going to have to invest in a set of calipers, since eyeballing the width against a tape measurer is a pain in the butt. The tanto tip is not as wide, but I did not grind the tip down to a COC. I got three heads down to 7/8" width and a 2 grains deviation between the three. I'll reset the bevel, sharpen, and they should be good to go.  I might play around with some other unvented (vented blades are taboo) trad heads like STOS and Zwickey. |
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Post by BT on Feb 16, 2009 13:30:02 GMT -5
Good for you! I'll bet your gonna see some very good results provided the centerline holds. |
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royden
Senior Board Member
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Post by royden on Feb 16, 2009 21:37:10 GMT -5
 good job doegirl 2 grns is real close for hand grinding on a head. You could check width by making a jig 7/8" wide with a 1/8" hole in the center for the threads - by turning the machined broadhead in the jig you will see if one side is longer .... never done it but I think it would work to help get your heads all be the same.
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Post by stilllearning on Feb 20, 2009 22:06:32 GMT -5
I will be sending my bow off to BT tomorrow morning. But before I sent it out I wanted to try a few shots into the pail to see what would happen. I will have to get the weight of the arrows once I can borrow a grain scale. This Martin Prowler SE is shooting at 240 ft per second and that is not that fast at all. The pull is set at about 54 lb of pull. So I started out with a pale full of water and some arrows. I took the Easton Epic and put a 75 gr boss bullet on it and another arrow with the same head but it is the Easton Epic ST shaft. I wanted to see if there was any difference. All shots taken from 20 yards. The flat flight limit of this bow. Here are the photos with the Boss bullets. I was a little surprised to see them up to the fletches. Very interesting.   Older epic on top and the new ST technology on the bottom.  This photo in here only because I found it neat with the lighted nock.  OK after some repairs to the pail, you have to love duct tape, and I turned the pail 90 degrees from the first shots. It was getting darker and harder to see the pail so I put some duct tape on the pail so I would have points of aim. I took two more arrows which were the same as the first two shots, one Easton Epic and one Easton Epic ST. They were both fitted with 85 gr Magnus Stinger with Bleeder blades. The actual weight on these is closer to 95 gr for some reason. Two more shots and I am not sure what to think. You look and make your own conclusions.  Wait a minute ..... Were is the other arrow? There is the second hole.  Oh there it is..... but wait that is the older larger diameter arrow and it is that far through?   Very interesting. I only wish I had the new arrows that BT suggested I use to try them. BT if you have a chance to try it when the bow gets there could you try the fast flight arrows so we have a base line for the new bow when it arrives? It will be interesting to see what results we get from the bow BT has set up at 280 ft per second and shooting poundage in the hight 40's. |
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Post by Doegirl on Feb 21, 2009 7:16:12 GMT -5
Excellent pics, Stilllearning It'll be exciting to see you get back your BT'ized Martin  |
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Post by Buckshot06 on Feb 21, 2009 7:56:32 GMT -5
Great pics and the bucket test BT showed works realy good. So what heads do you plan on using for hunting  |
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Post by BT on Feb 21, 2009 12:12:50 GMT -5
Excellent! This should be a really fun thread to follow. I promise to add where I can, ask questions when I have them! Hats off to you guys for taking this on, and sharing with the rest of us! BT - since there could be some time between posts, can you tack this to the top of the thread so we don't loose track of it if a lot of posts come between entries? Folks might want to check in and see what's going on periodically, and once it rolls off the page it tends to get harder to find for folks. I have been doing just that and by the way....After having reposted this entire board....we moderators need to talk  ALSO! It will be easy to see who is saying what. Doegirl is quoted in yellow and stilllearning is quoted in white |
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Post by BT on Feb 21, 2009 12:32:00 GMT -5
Stilllearning...I hope you included both those arrows with the bow  I need to know the listed gpi for each of those arrows please. Also.... For the penetration test that you just did.... The fletching are not allowing the arrow to show it's full potential and are skewing the results. Bare shaft or feathers is the only way to go. However...I saw what turned out to be the facts on the first round which was (as you stated) that the old epic outperformed. This part of the reason that I need specs and the arrows on hand before I break this all down. Some thoughts though... First of all the impact difference shows that there is either a difference in the outside diameter of the arrow or that the bow is out of tune (rest low/high) or both. The incline of the arrow will effect penetration so the difference (in part) could be due to the fact that one arrow is true while the other is not. If tune is ruled out then we have to look at shaft diameter. If diameter is different then the larger shaft will strike higher. Also...if the shaft is larger/smaller this will effect the same tuning issue as if the rest were too high/too low. AT longer ranges, the diameter difference would effect so little a change (due to the vanes correcting flight) that it would be unlikely to effect anything. However...at close ranges, the vanes would not effect the needed change in most cases. The net effect pertaining to head performance however is very well shown where the higher ratio stinger out performs the high ratio boss. It would be my belief that the stinger equiped arrow would have cleared the bucket easily without the blazers or with feathers attached. |
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good job doegirl 
