Didn’t Norbert Mullaney do a efficiency technique that he used in Archery World magazine bow reports starting back in the 1970s for stored energy.? Tom Lund
You could use integral calculus - but that'd require working out the mathematical function for the DFC which, for your super recurves, could be a challenging exercise hehehe!
@@edsorens half the time we dont need the DFC. We sum the values up straight off the draw board, and have an SE/PDF value within seconds. It it looks good. Then we plot the graph. And we can play with data from then on.
Sounds to me like he kind of was using calculus, but in a way that is slightly more understandable. But, I have only a vague understanding of calculus. I’m certainly not a mathemagician.
Alternatively you can get a heavy arrow, that shoots between 100 fps and 150 fps, and use the equation: ft lbs energy = ( * speed * speed ) / 450240 The reason for the heavy arrow is that bow efficiency goes down with lighter arrows. So to see the actual energy of the bow you need a heavy arrow to take more energy away from what gets wasted to move the limbs. If you use a normal arrow the higher speed of the arrow limbs will be taking more energy that would be going to the arrow.
@@musikSkool limb construction changes efficency too, the difference in dynamic mass of a limb can be nearly 20%. The dynamic mass has nothing to do with stored energy. There are very very few genuine carbon limbs on the market, most have a glass fiber content. Real carbon laminated limbs really excel in the dynamic mass stakes. Dynamic mass doesn't just include limb materials, but also includes working limb length.
This is a nice easy thing for an Excel sheet. 3 Columns. First gets numbers from 0 to 20 (or beyond). Second gets the poundage as measured. From 0 to whatever. Third starts with 0. And all others below are of the form of =B1*(A2-A1)+0.5*(B2-B1)*(A2-A1) - (a proper rectangle plus the small triangle on top) You sum the third column for Energy. This way you interpolate a basic arithmetic mean also known as a poor mans Integral if i did not butcher the language.
Didn’t Norbert Mullaney do a efficiency technique that he used in Archery World magazine bow reports starting back in the 1970s for stored energy.? Tom Lund
@@Tom-d6l no idea. I hope it didn't use speed as the variable. Hope it used mass.
You could use integral calculus - but that'd require working out the mathematical function for the DFC which, for your super recurves, could be a challenging exercise hehehe!
I'm trying not to scare people off
Excel or a similar spreadsheet program can be used to get a polynomial curve that fits the data points, super recurve or otherwise.
@@edsorens half the time we dont need the DFC. We sum the values up straight off the draw board, and have an SE/PDF value within seconds. It it looks good. Then we plot the graph. And we can play with data from then on.
Sounds to me like he kind of was using calculus, but in a way that is slightly more understandable. But, I have only a vague understanding of calculus. I’m certainly not a mathemagician.
Alternatively you can get a heavy arrow, that shoots between 100 fps and 150 fps, and use the equation:
ft lbs energy = ( * speed * speed ) / 450240
The reason for the heavy arrow is that bow efficiency goes down with lighter arrows. So to see the actual energy of the bow you need a heavy arrow to take more energy away from what gets wasted to move the limbs. If you use a normal arrow the higher speed of the arrow limbs will be taking more energy that would be going to the arrow.
@@musikSkool limb construction changes efficency too, the difference in dynamic mass of a limb can be nearly 20%. The dynamic mass has nothing to do with stored energy. There are very very few genuine carbon limbs on the market, most have a glass fiber content. Real carbon laminated limbs really excel in the dynamic mass stakes.
Dynamic mass doesn't just include limb materials, but also includes working limb length.
This is a nice easy thing for an Excel sheet.
3 Columns.
First gets numbers from 0 to 20 (or beyond).
Second gets the poundage as measured. From 0 to whatever.
Third starts with 0. And all others below are of the form of =B1*(A2-A1)+0.5*(B2-B1)*(A2-A1) - (a proper rectangle plus the small triangle on top)
You sum the third column for Energy.
This way you interpolate a basic arithmetic mean also known as a poor mans Integral if i did not butcher the language.
100%
It's the most simple method I've seen that gets you within decimal points of accuracy
I believe this is called a Riemann sum.
Or your form may be a trapezoidal sum.
@@edsorens I think your right. A left right and center version is available I think.
For this purpose. That level of detail.isnt needed IMO
I think you ought to invest in a whiteboard, saves you the permanent marks on benches !
Scrap ply is scrap ply