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Looking for a 400 yard shot
sleek:
Im half way to the salt flats at this point. My goal of going there to shoot a 90 pound has once again been thrwarted by my own abilities. I will instead be showing up with an 85 pounder. However this 85 came out with a very high energy storage and efficiency. It stores 88% of its drawn energy, anything 85% and up is great. This bow should shoot well as long as I do my job and made good arrows.
Ill be going with a few other bows as well. One special one by Super Dave. Arvin and I did a force draw chart on that bow last night. Its an amazing bow, storing just over 104% of its draw weight in energy. That is phenomenal on its own. I expect very impressive results from it at the salt flats.
400 yards is my goal, and im going to try to get there with my 85 pounder. I also made an 88 pounder ( again missing my 90 pounder goal but this time due to the limits of the wood ) and it will be shot by a very well known and respected archer all over the world, a Hungarian named Monus. I hope he has success with this bow as well.
However I also believe a 50 pound bow can get that 400 yard shot. Lessons this year will be applied to next year's bows and hopefully a 50 capable of going the distance will be made.
All of this would be made easier if the bow were the only challenge. The problem is, a bow is useless without an equally good arrow made and tuned to the bow. I have learned that an arrow being light weight as possible is not what a bow needs for its fastest shot. An arrow actually needs to be a certain weight and too light will actually slow the arrow down. Many years ago in here I described a bow limb wave theory. This new to me discovery on the weight requirements for an arrow support that theory. Ill report more during and after the event.
Del the cat:
--- Quote from: sleek on August 26, 2025, 10:55:53 am ---... Arvin and I did a force draw chart on that bow last night. Its an amazing bow, storing just over 104% of its draw weight in energy. That is phenomenal on its own.
--- End quote ---
Hi, I'm confused as to how you measure the stored energy ( area under the force draw curve?)...
and how it can be more than 100% ( maybe because there is energy stored in the bow from when it was braced?)
(I'm not trying to argue, just seeking clarification).
Del :)
Badger:
You might be on to something with those frets but for a slightly different reason. I believe they could reduce vibration and distortion which is the biggest loss the bows have. Shorter working limbs or shorter bows is how we currently deal with it. You might be able to make a longer bow with very little vibration.
Badger:
The lighter an arrow is, the faster it will shoot. However, how far they will shoot is another story. tuning becomes more critical as arrow weights go down and it becomes harder to maintain a favorable drag co-efficient. Josef shot an 88# ELb 530 yards in practice but shot the bow out. In competition, he still broke a record at 450 yards with a fast flite string.
sleek:
--- Quote from: Del the cat on August 26, 2025, 02:45:33 pm ---
--- Quote from: sleek on August 26, 2025, 10:55:53 am ---... Arvin and I did a force draw chart on that bow last night. Its an amazing bow, storing just over 104% of its draw weight in energy. That is phenomenal on its own.
--- End quote ---
Hi, I'm confused as to how you measure the stored energy ( area under the force draw curve?)...
and how it can be more than 100% ( maybe because there is energy stored in the bow from when it was braced?)
(I'm not trying to argue, just seeking clarification).
Del :)
--- End quote ---
I use the formula 1/2(A+B)÷12=X
A and B are the weight at consecutive draw lengths. I do a force draw chart, starting at a 7 inch brace. Since 7 is brace its pulling 0 pounds. The chart looks like this: first column is inches of draw, second is weight in pounds.
7:0
8:2
9:9.8
10:13.4
Plugged into the formula it looks like this:
1/2(0+2)÷12= .083 foot pounds of energy
Then I move down from inches 7 to 8, to 8 to 9
1/2(2+9.8)÷12= 4.92
This is repeated all the way down the FD chart. When completed, I add up all the foot pounds of energy stored in each inch of draw. That tells me total amount of energy the bow stores when drawn. Then I divide that number by the draw weight of the bow to get a percentage of efficiency: how much energy the bow stores vs how much it draws. Compounds are always over 100% and a good self bows will be 85% or higher.
I hope that helps you out.
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