Die Suche ergab 5 Treffer

von JamesPark
3. Jan 2024, 22:51
Forum: Technische Aspekte Pfeil und Pfeilflug
Thema: Pfeilschwingung/Eine These
Antworten: 138
Zugriffe: 9396

Re: Pfeilschwingung/Eine These

JamesPark hat geschrieben: 3. Jan 2024, 09:57 I modified my arrow dynamics program just now to include a paper test.
About the best I can get for the lateral tear with the recurve bow tuned properly is a tear of 10mm with the paper about 400mm in front of the bow. Further out, the tear is larger.
von JamesPark
3. Jan 2024, 09:57
Forum: Technische Aspekte Pfeil und Pfeilflug
Thema: Pfeilschwingung/Eine These
Antworten: 138
Zugriffe: 9396

Re: Pfeilschwingung/Eine These

I modified my arrow dynamics program just now to include a paper test.
About the best I can get for the lateral tear with the recurve bow tuned properly is a tear of 10mm with the paper about 40mm in front of the bow. Further out, the tear is larger.
von JamesPark
27. Dez 2023, 11:01
Forum: Technische Aspekte Pfeil und Pfeilflug
Thema: Pfeilschwingung/Eine These
Antworten: 138
Zugriffe: 9396

Re: Pfeilschwingung/Eine These

It is a very interesting topic. The arrow flexes as well as rotates about its centre of mass. The flex will be predominantly first mode, but probably with a little bit of second mode. You can see that in some pictures where the arrow can take an S shape. The S shape is the second mode. It will be fl...
von JamesPark
27. Dez 2023, 09:41
Forum: Technische Aspekte Pfeil und Pfeilflug
Thema: James Parks Programm
Antworten: 5
Zugriffe: 1363

Re: James Parks Programm

Ralf, I guess Dropbox would work. In modelling arrows, we need to calculate the mass, diameter and stiffness along the shaft. I have found the manufacturer's stated mass and diameter specifications are usually not of sufficient accuracy. I measure the outside diameter - and you can do that with good...
von JamesPark
24. Dez 2023, 10:32
Forum: Technische Aspekte Pfeil und Pfeilflug
Thema: James Parks Programm
Antworten: 5
Zugriffe: 1363

Re: James Parks Programm

I assume you are referring to my program showing arrow behavior during the power stroke of a recurve bow? (I have a few other programs as well - all part of my research). If that is the one, yes, I have made it freely available. It covers a good range of arrows, but not all arrows - just the ones th...