The 10 inch peice of shaft adds 98 grains.(got to count the glue that holds it in there) The total finished weight is 516 grains. The math comes out to 103 ft/lbs of kinetic energy if I use the same 300 f.p.s. that you used in your formula.secret said:Wheres the math? !0" piece of shaft weights 74 grains.....?????????????????????
Outstanding suggestion!arrowhead said:I guess I should have mentioned....By using the 10 inch peice of 1913 shaft it helps keep the forward of center balanced better. It also adds spine to the shaft.
By adding backweights to the insert you are effectively removing spine from the shaft. You are also adding too much weight to the front of the shaft. (just my opinion here...but we are getting our best flight between 15 and 18 % forward of center on most bows) I do know some guys are getting good flight with much more F.O.C.
Here is a tip: build the shaft without vanes. Shoot through paper just like you would with a vertical bow. When the paper tears look like an O you got the perfectly balanced arrow. It's a huge investment in time, but the results are well worth it.
secret said:No wander i couldnt get the victorys to fly,,,,,,, i didnt Modify them enough too fly!!!!!!!
thats what i thought also....so why all the "flight" complaints in this thread?????????it sounds as if this took a divebomb at some point.....nl outdoors said:Kinetic energy does not really effect arrow flight. Front of center will. Crossbow bolts generally fly best with alot of weight up front. If you have too much weight up front you will usually hit low left. The best way to tell if you have proper arrow flight is by bare shaft tuning.