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GB energy loss

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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GB energy loss

Unread postAuthor: velocity3x » Wed Dec 14, 2011 10:23 pm

I found this old pic in my computer today. This graph was generated by doppler radar. It shows the projectile speed from the muzzle to the point of impact of a shot I did awhile back. The green line represents a Golf Ball with 700 psi of nitrogen behind it..

Incase the pic is illegible:
Upper left shows the GB launched at 364.4 mps
Lower right is time to impact. It shows the GB slowed to 304 mps in only .035 seconds. A GB or spherical shapes definitely are not the best choice for ammo.
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Last edited by velocity3x on Wed Dec 14, 2011 11:18 pm, edited 1 time in total.
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Unread postAuthor: Gun Freak » Wed Dec 14, 2011 10:57 pm

Can that really be right? For such a short time, it seems impossible a golf ball can slow down such a significant amount, especially given their designation for flight.
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Unread postAuthor: velocity3x » Wed Dec 14, 2011 11:06 pm

Gun Freak wrote:Can that really be right?

I'm sure it's correct. The crew that tracked it brought in a truck heaped with computers, antennas and cables. They routinely tracked the space shuttle launches and other events around the world. They're quite good at their job and I believe them. The graph is plotted with about 100,000 way points from launch to impact. The results do not speak well for GB performance.
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Unread postAuthor: jackssmirkingrevenge » Wed Dec 14, 2011 11:20 pm

Gun Freak wrote:Can that really be right? For such a short time, it seems impossible a golf ball can slow down such a significant amount, especially given their designation for flight.


First of all, remember that a projectile's drag quadruples when velocity doubles, and this particular golf ball is starting out at mach 1 :?

Secondly, aside from its high drag spherical shape, a golf ball has relatively low density, just 45 grams weight. If you had to make the same diameter balls out of steel or lead, they would weigh 330 and 470 grams respectively!

See if mythbusters had used a giant golfball instead...
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