<BLOCKQUOTE id=quote<font size=1 face='Verdana, Arial, Helvetica' id=quote>quote:<hr height=1 noshade id=quote>
JeffB-

How do you think the BKII's cams are optimized for lighter arrows? I know you found that in your setup that lighter arrows worked a little better, but do you think that can be atributed to finding the &quot;magic spine&quot; for your setup?<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face='Verdana, Arial, Helvetica' size=2 id=quote>

I don't think so, as the greater speed and energy was the case with various spined arrows in the same weight range out of my bow: various Carbon express shafts of different sppine values, , as well as two different spines of A/C/C's. In addition, I know of two other owners of the BT Pro-38DC (which uses the same general cam) who have run into the same scenario. Also, IIRC Matt/PA's results were similar to mine. Perhaps he will jump on here and comment.

<BLOCKQUOTE id=quote><font size=1 face='Verdana, Arial, Helvetica' id=quote>quote:<hr height=1 noshade id=quote>They would use the same cams on a bow set at 55#'s as they would on a 70# bow. How would the cams be designed for lighter arrows?<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face='Verdana, Arial, Helvetica' size=2 id=quote>

I'm not sure what you mean here regarding the different draw weights. Draw weight did not factor into my discussion re: the increased efficency of the BKII cams with lighter arrows. I did dicuss it regarding overall bow efficiency however.

Now, HOW are they optimized? Good question... I am no engineer.It is my OPINION it's done with where the cam stores more energy (in a relative sense) than most other cams: at the last few inches of draw weight. I believe this gives a lighter arrow (especially) a bigger initial &quot;push&quot; than most other cams as they travel back to brace.

JeffB <img src=icon_smile_big.gif border=0 align=middle>