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Arrow Speed?????

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JackCrafty:
If I use the rule:  100 fps + BDW*= average speed for an arrow that is 10 grains x BDW, most of my bows are shooting below average by about 10-15%.  I'm closing the gap though, and I've made at lease one bow that shoots above average.  I don't have data on all my bows, though. :-\

*BDW =  bow draw weight

I think most of us don't keep records of arrow speed because we build for fun and sport....not for competition.

Badger:
Jack, that rule of thumb came up at the first mojam and is confusing a lot of folks, the way it works is 100 fps plus draw weight with all bow using the same 500 grain arrow. really a pretty useless formula. Most now just use a 10 grains per pound formula which would put all bows at the same standard. I think average is about 150 fps while 175 fps would be exceptional add about 10% to those speeds for laminated all wood bows, boo backed etc.   Steve

JackCrafty:
Badger...so 150 fps would be about average assuming a 50# bow @ 28" draw?

My bows draw between 20-22", so I use a chart in TBB that shows a loss of about 3 fps for every inch below 28".  Is that about right?  (I don't remember too good). :-\

Badger:
Jack, that sounds about right. Steve

JackCrafty:
Badger, I'm going to bug you with another question, if I may?

Let's assume that a bow is 48" long, has a 22" draw, pulls 45#, and is a simple self bow.  What would be the average speed? ;D

I'm thinking the average would be a lot less than 150 fps, right?  Maybe 120 fps?  It's my understanding that short bows with short draws generally underperform compared to longer bows with longer draws (with the same draw weight).

The reason I ask is because I'm trying to develop some formulas for bow speed and ideal bow mass for short bows.  I'm also working on a spine chart for short arrows (under 24")

Thanks.

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