Mass principal ?

[Stick Bender]

I was rereading the mass principal this morning & trying to figure the mass on a 44 in. bendy that I'm making but sense the base dimension chart stops at 58 in. , I understand the working limb to draw length calculation but does any body know how to calculate the base mass for a 44 in. bow ?

[High-Desert]

I'm pretty sure I've been doing it wrong, but I have always treated the chart as linear, although I'm sure it's truly not. So every 2" shorter bow, reduced mass by a half ounce. And then apply the other rules. It's always worked for a 44 in bow you would reduce mass by 3.5 ounces. I built a 40" bow using this method, of course sinew backed, and it came out what seems like an appropriate width and thickness for its poundage. I'm sure someone else knows more about this tho, this is just how I've done it.

Eric

[Whiskeyjet]

I have been wondering the exact same thing. 

[Badger]

I'm pretty sure I've been doing it wrong, but I have always treated the chart as linear, although I'm sure it's truly not. So every 2" shorter bow, reduced mass by a half ounce. And then apply the other rules. It's always worked for a 44 in bow you would reduce mass by 3.5 ounces. I built a 40" bow using this method, of course sinew backed, and it came out what seems like an appropriate width and thickness for its poundage. I'm sure someone else knows more about this tho, this is just how I've done it.

Eric

  Because it is more of a rule of thumb that a precise measurement I cut it off at certain points and designed more around typical bows. But I have used it linear and it seems to hold up fairly well. I will check out the op's and see what I come up with.

[Badger]

  If you were going 50# for a 24" draw bendy handle the online calculator says 6 oz. That's too light. The calculator takes off 5 oz for being 44" long. I would not subtract the 5 oz and go for a total mass of about 11 oz.

[Stick Bender]

Ok thanks Steve I appreciate it that will get me in the ball park !  Good to know for making shorter bows  Thanks !

[upstatenybowyer]

I just weighed a 42" bendy yew I made and it's 11 oz. Eureka!