RE: arrows/ tip weight??
 

Try these, the Gold Tip website FOC calculator: http://www.goldtip.com/calculators/foc.asp

or go to Jackson's Archery Page and try this one here: http://home.att.net/%7Esajackson/foc.html

Jackson's page is great, with a wealth of resource info, including a pretty awesome ballistics calculator. It's been in my "Favorites" for about 3 yrs. now. Good Luck, hope that helps a little.

RE: arrows/ tip weight??
 

Get one of the programs . They take the guesswork out of it. I use OT2 and really like it. With it you can try different setups for your bow without having to buy the arrows first. Well worth the small price.