Abstract
will deal only with reference to the comparison interior ballistics.
This comparison will cover speargun with a single circular double circular rollergun (a type of spear guns in the last 10 years has not been able to enjoy visibility due to legal problems inherent in its marketing)
I wrote this article trying to make it as understandable as possible for everyone.
It 'obvious that underlying this analysis there are formulas that can be more or less complicated but I found it more profitable to try to make possible a more discursive thought process that leads to certain results rather than to bore into a sterile list of formulas that can easily bored with any player, otherwise become available to investigate all reasoning in the forums.
He has always tried to make a comparison between double and single tire rubber, we have heard of all, the comparisons have seen plenty of evidence involved, sometimes using the same auction, sometimes using a different auction, often using different tires and cut into different factors. Obviously too many variables can not provide data for a comparison is not objectionable, provided there is not a comparison questionable.
I want to analyze in theory this topic so that it can be starting point for discussion between fans and occasions: from this moment of confrontation are some interesting ideas that might emerge in that article and is therefore subject to possible revisions.
In this analysis does not even speak of the mass of the gun and the mass of the auction, then these two variables will be chosen on the basis of the available energy in the system and the way in which this energy is released .
The energy is then analyzed and compared to the gross friction, recoil, etc ...
I chose to do this analysis, as the appropriate constant parameters, namely:
- The analysis is done using the curves for the cycles of loading and unloading of tires Cressi G-20: I am such an analysis was made possible thanks to charts made by Ing. Endorossoro I do not know personally but whom I thank for making them public
- This comparison is made with the same tire compound and the same stretch factor
- E 'was chosen to analyze the tires to work online in the individual circular in the double circular
- E 'was chosen to fix the length of the bullet and 3.5 cm to 1.5 cm portion of the rubber after ligation with respect to each circular analyzed
- The comparison he uses an auction in which the two pins are placed at a distance of 7cm
- The speargun with double circular uses the configuration that provides as much energy available, the single hole in tested
- not tested any friction which suggests that the tires do not struscino on trees, etc. ...
Arbalete 90 double circular
Riepiloghiamo i dati fondamentali di questa analisi relativa al doppio circolare:
- Spinta globale: 57 cm
- Energia restituita: 198 Joule
- Punteggio (*): 100
Arbalete 90 con singolo circolare
summarize the basic data of this analysis on the single circular
- Boost overall: 57 cm
- returned Energy: 102 Joule
- score (*): 72
First Reflections
Using tires of the same type with the same stretch factor of the energy available to a double-ring is always higher than that of a speargun with a single round of the nominal length.
Without this reflection, the first question that might be raised is:
area energy of the double round speargun which analyzed with single circular can be compared?
A question that is less difficult than it looks!
Arbalete 167 single circular
The push continues for another 8 cm that the graph is not to set a display limit
summarize the basic data of this analysis
on the single circular 167cm (long ?!?):
- Boost overall: 108 cm
- returned Energy: 198 Joule
- score (*): 140
Well, our question was answered by analyzing the energy area alone we have found what is the spear guns is comparable to our 90 with double movement: it is dell'arbalete with 167 single round!
Paradox
Looking for a comparison of the energy of a triple circolare con un singolo circolare ci saremmo ritrovati addirittura a paragonare un 90 triplo con un singolo circolare di circa 2 metri e mezzo.
Credo quindi che possa essere evidente come il confronto delle sole aree energetiche sia assolutamente inadeguato per paragonare i diversi sistemi.
Quali domande ci stimola questa riflessione:
- Siamo sicuri che abbia un senso paragonare un arbalete only by comparing the energy area??
- will be so indifferent to the length of the thrust??
- The double circular urges the auction for only 57cm speargun while it pushes the single-round auction for even 108cm, we are sure that it is appropriate to neglect this important difference??
- ... and how we can take this into account??
But here, at this point, I had to search a variable that could take into account both the length and energy of the test, albeit approximate, due to evidence and empiricism, which could have some bearing on reality.
(*) Here comes into play the famous score, a value that is determined by an algorithm, if we are also expressed in the form of function: what is certain that I had to seek verification of these statements by the empiricism of some tests I've had good results.
On based on this variable, this here is what is the generic score with a single spear guns which I think is comparable to 90 circular double circular
Arbalete 120 with single circular
summarize the basic data of this analysis
on the single circular 120cm:
- Boost Global 77cm
- returned Energy: 141 Joule
- score (*): 100
What is this comparable to roller speargun?
Well, the traditional classic roller tires stretched to 300%
and be contented with a boost of only 77 cm active
reproduces the feel of this band guns with 120 single round.
This means that a traditional classic roller
that exploits the full 90 cm available
would score a higher energy.
more reason to work with each roller tires stretched
energy will have a score even higher.
I always remember that we are analyzing the energy before any friction.
There is a 90 compared to 90 single circular double circular?
But it is also possible to find a speargun 90 with single circular cararatteristica have the energy to get a draw with the double Circular analyzed.
We must increase the energy in this case and, using the same compound tire, we will increase the larger diameter and more stretched.
Arbalete 90 single circular stretched from 20 to 380%
summarize the basic data of this analysis
for the individual round of 90 cm:
- Boost Global 63cm
- returned Energy: 177 Joule
- score (*): 100
Conclusioni
Non ritengo sufficiente ai fini di un confronto
la sola analisi dell'area energetica
o la sola analisi della lunghezza della spinta
ma occorre una variabile che tenga conto di entrambe
...quella che sto utilizzando I simply called
energy score ... and score as indicated
... certainly not found in any physics book
but This does not make it any more valid or less valid
simply is still being verified.
In comparisons based on the score energy
the performance of circular and double roller classic
were nearly equivalent
(even if using only 77cm roller thrust active
otherwise obtains an advantage the rollergun)
speargun while with the single circular
will require a large-diameter tires or more stretching
to be equivalent.
With the same compound and stretching factor
a double round scores a power
always superior to a single circular
it will need to use
larger or more tensions tire
to be equivalent to twice the circular.
Ritengo ovvio
(ho quindi evitato di riportare i grafici a dimostrazione)
che un roller che sfrutti una gomma più lunga
(che sia pretensionata o adotti altri sistemi di maggior tensionamento)
oppure utilizzi un circolare aggiuntivo
avrà un maggior punteggio energetico rispetto al roller classico
Precisazione:
Il pareggio del punteggio energetico
non significa pari prestazioni relative alla balistica esterna
anche perché
occorre tener present
different friction of the various systems
different bullets, spears, drums, etc. ...
that this impact on the external ballistics
(recoil, the recoil time, energy loss, spines, spin, etc ...)
Ad. es.
a more powerful long with a lower average energy
be more progressive and will result in smaller bending
rod, have a significant impact
up performance and accuracy
well as having a reduced energy loss
due to the recoil
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