Science time!

Ratfor

Ratfor

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Ok, so this is Loosely a shotgun question.

Friend has a manufacturing business, they make equipment for the outside of vehicles (I won't say what exactly).

We need to determine how well the housing will stand up to being hit by rocks on the highway, And we need to it be repeatable.

Therefor, What shotgun load would you say best equates the impact force of the rocks you'd find on the highway that fly up and hit vehicles?

Obviously, given that a shotgun load will be moving significantly faster then a piece of gravel, the shot would need to weigh considerably less the a piece of gravel.

Now we could just load some custom shells, dial in with a chrono and Simulate gravel, but it would be significantly more impressive to use a full shell.

From some quick napkin math, I'm thinking #7-#8 shot should be about right. (with each pellet impacting the same force as one piece of gravel).

Thoughts?
 
you could use a spinning wheel to throw golf balls at the target or marbles that would work as well. You might want to look at baseball pitching machines or cricket. It's less hassle then a firearm as you might have a bylaw that says no discharge in your area.

A shotgun by default isn't repetable it is to a certain point if the rocks are thrown to the side they may not have the same force as the ones in the middle as it is shooting shot. You want a single rock to get better results

You might want to also consider an air gun as well.
 
Ratfor said:
Obviously, given that a shotgun load will be moving significantly faster then a piece of gravel, the shot would need to weigh considerably less the a piece of gravel.
Click to expand...
The shot would have to be gravel. And at the same velocity as gravel relative to car. If it is Science time.
schleich_catapult.jpg
 
The surface of a lead pellet hitting glass vs. the surface of a chunk of "rock" hitting glass, (on the scale that matters) are simply not the same thing. Why not look into "rock slugs" or maybe even a simple slingshot, like the one used to chuck water balloons. One of those slingshots, would allow you to fire the entire range of potential projectiles ie. anywhere from marble size, to fist size rocks.
Ratfor said:
Ok, so this is Loosely a shotgun question.

Friend has a manufacturing business, they make equipment for the outside of vehicles (I won't say what exactly).

We need to determine how well the housing will stand up to being hit by rocks on the highway, And we need to it be repeatable.

Therefor, What shotgun load would you say best equates the impact force of the rocks you'd find on the highway that fly up and hit vehicles?

Obviously, given that a shotgun load will be moving significantly faster then a piece of gravel, the shot would need to weigh considerably less the a piece of gravel.

Now we could just load some custom shells, dial in with a chrono and Simulate gravel, but it would be significantly more impressive to use a full shell.

From some quick napkin math, I'm thinking #7-#8 shot should be about right. (with each pellet impacting the same force as one piece of gravel).

Thoughts?
Click to expand...
 
We aren't talking about glass. Impact resistant plastic. I did the math properly, each of the 350 pellets in a #7 1/2 shell hits with 8 times as much energy then a peice of gravel.

It's true, a slingshot would much more effectively simulate gravel, but I'm less interested in accuracy and more with an impressive demonstration.
 
My math says an average piece of gravel hits a car traveling at highway speed with 0.61 ft lbs force. That's reslly low, I dont even think an airsoft gun would get that low and still work properly.
 
This is not a problem that can be done with simple math. It's much more complex than it seams. You are trying to determine how resiliant a material will be to collisions with small particles. The doesn't just depend on the kinetic energy the particles have, but it the size, momentum and material properties all come into play. Don't waste time playing the math game. Your not going to achieve anything here. What you need to do is some good ol fashion trial and error, commenly known as research and development. Strap a peice of this material under a truck, and then go 4x4ing on a dirt road, and see how it holds up. Try different types of housing, and try driving around at different speeds, and on different roads, This is the best way your going to find out how durable your housing.
 
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