View Full Version : Speed?
01-21-2010, 09:10 AM
What kind of speed should I be looking for out of my bow? It is advertised at 345fps. The bow is an 09 firecat 70lb dr wt 28" dl 5575 gt arrows with 100 tips.
depending on what model of GT 5575 arrow it is(pro,XT or XP), cut at 28 in with 100 gr head is going to be anywhere from 375 to 395 gr. What is on your string? dloop and peep? silencers?i will assume yes. Cams wrapped and in tune. I would say your going to get 305-310fps range.
01-21-2010, 04:15 PM
Try this: http://utopiaprogramming.com/ke/KineticEnergy.html#
01-21-2010, 05:48 PM
I just tried it and with the known variables input it came very close to what my real world speeds are. The last time I shot through a chronograph it was hitting very consistently 289-290 fps. The calculator estimated 292.7 fps. Needless to say I bookmarked the site.
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