Strength of the bow and arrow speed

Measurement of the mechanical properties of PVC bows

 

After I test the PVC bow that works, I was curious about the mechanical properties. I measured the total power, energy and power during the course of draw. Then I saw the actual speed of a flying arrow. During the test, I used two plastic bows. One stronger and one weaker.

 

 

Horsebow

 

 

Jazdecký luk z PVC rúry o sile 42 lbs pri náťahu 28 palcov.

 

 

 

 

Recording over power riding the bow depending on the size of draw.

 

 

I bow upol a machine that records the strength and path. The bow is kept at the center of one point and the other for the string. As is the case in the shooting. The x-axis represents the length of draw, starting from the value of 6 inches. It is the chord distance from the center of the bow when the bow is in idle state. Chord has been some bias, but the strength of the bow is then zero.

 

The graph shows that the course of power does not rise linearly. The perfect bow should be running more hyperbolic curve. From the graph, we can subtract the power of the bow for different lengths stretching.Zintegrovaním area under the curve can calculate the potential energy or work, you can make a bow. I quantify the power of software.

 

 

 

 

Krátka ukážka streľby z plastového luku.

 

 

Short demonstration firing of a plastic bow.

Calculated energy poetciálna bow never not converted to full speed. To determine the actual speed of a flying arrow, I used a high speed camera. I shot at the target, which was before the ruler. The arrow path flown over a period of one millisecond can calculate speed. While shooting, I used carbon arrow weighing 25g.

 

 

Recording of high-speed camera. Measured speed 38 m / s which is the equivalent of about 137 km / h.

 

 

Factors that affect the rate of:

Bow-arms are flat, I would not do gradual stenšovanie section
-String the ordinary nylon cord that goes in its ductility Energy bow
-Arrow had reasonable strength to strength bow
Arrow nock-held too tightly on the string
Bow-not elementary school, so the squadron wiped his hand on the bow
If I have work to do on it, Water drain arrow speed could be further increased.
Ladies bow

 

 

 

Ladies bow

 

 

Dámsky luk sily 19lbs pri náťahu 28 palcov.

 

 

 

Záznam priebehu sily slabého luku v závislosti od veľkosti náťahu

 

 

 

 

Recording of high-speed camera. Measured speed of 32 m / s which is the equivalent of about 115 km / h.

 

 

 

 

Kam ďalej?

PVC luk - Výroba PVC lukov, ktoré boli testované.

Balistický gel - Balistické skúšky dreveného luku a šípu.