Saturday, October 18, 2014

RUST SLUGS


At the last shoot where we shot the pellets,  etc.   we didn't have time to film some rust slugs I fabbed up.   Not only are the shotgun shells old and rusty,   the slug is made out of rust. 

I had a bag of rust chunks someone gave me so I ran some of that through a coffee grinder to turn it into a fine powder.   I then mixed the rust with hot wax.   

Since smaller particles collectively have more surface area than the same volume of larger particles,   we'll see how well these slugs hold up.  More surface area,  the stronger the bond and less space between the particles.   In this case,  bigger is NOT better.  

The slugs are not very heavy,  weighing in at only 4/10ths of an ounce.   

Tuesday, October 7, 2014

Ramset Powder Charges Drive .22 pellets at Hyper-velocities



We got some impressive results shooting .22 PELLETS out of a firearm using nail gun blanks bought at Lowes hardware.    This was our second attempt at doing this.   The first attempt,  tried about 4 months ago resulted in failure.   The first shot,  the entire base of the blank blew off and most of the blast came out of the ejection port of the rifle.   The rest of the case was stuck in the chamber and we did not have a cleaning rod with us to knock it out.


                                                              THE PROBLEM

It seemed logical to fix the pellets right onto the ends of the blanks.  However,  this did not seat the pellets high enough in the chamber.   I can only guess what occurred at the split-second,  but I think the pellet did not  transition from the chamber into the barrel smoothly,  so the blast  took the path of least-resistance,  blowing the end of the case off  right out the ejection port.

  We had 100% reliability by  muzzleloading the pellets so they were seated in the barrel,   slightly above the chambered blank instead of directly on it.   Although that is typically a bad idea to do,  (short starting -look it up)  it worked well in THIS application.   

Monday, October 6, 2014

Interference-Fit Shotgun Muzzle Brake



We finally got the custom muzzle-brake mounted on the Mossberg 590 and got to shoot some rounds through it.   What's unique about this brake is it isn't held on by screws or welds,  etc.  It's a shrink-fit.   The brake was made a couple thousands of an inch smaller than the barrel.  The brake was heated up and it expanded and just slid over the barrel.  Once it cooled down,   it stays on tight as a drum.   We got some cool muzzle flashes blowing out the sides during some filming today.  

Friday, October 3, 2014

Beer Rocket Update

                                                              CLICK PHOTO TO ENLARGE


The beer rocket was a failure.  After less than a minute of heating up the test tube,   the glass just cracked and the beer spilled out.  There was almost no pressure at all at this point.   The heat from the torch also melted one of the fins of the rocket.     

I'm not sure if I am going to try this again.   


SHOOTING VIDEOS

We are planning on filming again this weekend.   Tentatively,  we will try to shoot bolts,  rust slugs,   and will see if it is a good idea to use  "Ramset"  .22 cal.  nail gun rounds to shoot .22 cal pellets from a rifle.   We might have a new shooter join us and bring some of his guns.    

Friday, September 26, 2014

X-Acto Blades - Afterwards


Here is a photo of all the x-acto blades we were able to recover after shooting them.  The most surprising thing to me was how tough the blades were!

Friday, September 19, 2014

TTTT (Test tube torcher test) BEER ROCKET

                                                                     (CLICK TO ENLARGE)


MANY people have wanted me to invert the test tubes so when the cap blows off,   the test tube rockets off.    One problem with that is trying to frame it with the cameras.   I can't put the cameras under the table-  pointed upwards.   Also,   a test tube flying off under 100 to 200 psi would be VERY unpredictable and dangerous.    It has nothing to stabilize it.

What about putting the test tube into an actual model rocket?   I have a rocket and a launch stand--  it seems do-able to me.   Heck,  this might be the start of a new series where we try different materials to see if they will launch the rocket.   First one will use superheated beer.