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WTT3 bow photos and FD curves (images on page 3)

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Re: WTT3 bow photos and FD curves (images on page 3 added May 9)

Postby wantoknow » Wed May 13, 2009 9:07 pm

Still don't know what to think about the top end on this one.
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Re: WTT3 bow photos and FD curves (images on page 3 added May 9)

Postby wantoknow » Wed May 13, 2009 9:30 pm

One more b4 bed.
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Re: WTT3 bow photos and FD curves (images on page 3 added May 9)

Postby Hornseeker » Thu May 14, 2009 9:48 am

Good lord... is it actually possible to get nearly 99% efficiency from a longbow and 10gpp???? TJ..KEN... DAMMMMMMM! :o I have my work cut out...

Thanks again and again for all the hard work. And like Galen said earlier, questioning and reworking this stuff is NOT any sort of slam, only constructive criticism that we all need to make things more accurate. Wow... good Chit!

As for me figuring things out... its not like "light bulb" type stuff. ITs just that I think I need to get a little more limb working and pay a little more attention to timing. I will do that as time allows.

E
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Re: WTT3 bow photos and FD curves (images on page 3 added May 9)

Postby badger5149 » Thu May 14, 2009 10:22 am

I don't think it is possible, a good test would be to have Ken shoot a 1,000 grain arrow through his bow. If the arrow does about 145 then the new measure just might be right. I suspect the measurement for stored energy is low. Steve
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Re: WTT3 bow photos and FD curves (images on page 3 added May 9)

Postby wantoknow » Thu May 14, 2009 10:31 am

badger do you have another method for calculating the FD curve? I'm using a program that I found on line. I'm having trouble getting excel to use imputed draw lengths along with the draw weights.
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Re: WTT3 bow photos and FD curves (images on page 3 added May 9)

Postby badger5149 » Thu May 14, 2009 10:40 am

WTK, I wish I did, I just add up all the numbers at 1" increments and then divide by 12. This method initself is slightly flawed as it does not average out between the inches but is usually close enough for purposes. On the last 1" of draw which was only 1/2" I divided that by two as it was a 1/2 inch pound measure. The fdc graphs are still invaluable I think only slight correction is needed, I notice there are only 20 inch pound measurements fed in, there should be one more on the low end I believe but it wouldn't change things much anyway. Steve
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Re: WTT3 bow photos and FD curves (images on page 3 added May 9)

Postby Kenro » Thu May 14, 2009 11:35 am

badger5149 wrote:a good test would be to have Ken shoot a 1,000 grain arrow through his bow. If the arrow does about 145 then the new measure just might be right.

1000 grain arrow????? :shock: how am I going to come up with a decently ballanced arrow for that one???? :lol:
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Re: WTT3 bow photos and FD curves (images on page 3 added May 9)

Postby Hornseeker » Thu May 14, 2009 11:49 am

Easton FMJ 250.. they are like 17 gpi... Stiff as hell too... so... you could have a 32 inch arrow.... at 544.. Then put a 100 grain brass insert in...644.. then use morrisons 300 grain broadhead... 944... getting up there :mrgreen:
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Re: WTT3 bow photos and FD curves (images on page 3 added May 9)

Postby Catamount » Thu May 14, 2009 11:54 am

I think you could build a 1000 grn arrow easily by slipping an aluminum arrow into another aluminum arrow. That's what Chuck Adams would do for his elephant arrows. I think a 2016 or a goldtip xt fits inside a 2117 or something like that. A fiberglass fish arrow might be close too.
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Re: WTT3 bow photos and FD curves (images on page 3 added May 9)

Postby wantoknow » Thu May 14, 2009 12:02 pm

badger I don't know what to think about this because when I enter the same data as Jim in my program I get the same results. When I make the changes the stored energy goes down. I'm not convinced that's not correct but I'll have to do a side by side picture showing how much difference the wrong numbers increase the stored energy and why. I'm at work so I can't upload pics to photobucket but if you run a line from the 0 weight to the 28" weight on both you will see there is more area above that line with the incorrect numbers. Now we have to check to see if we have the correct formulas. I'll try to enter data from a Norb M bow test and see if I get the same numbers.
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