Thursday, January 10, 2019

Tuesday, August 14, 2018

Exploding targets, without explosive!

Let's face it, explosions are fun. From firecrackers to fireworks to firearms to demolition, releasing a lot of energy in a short period of time is very exciting. The sound of the explosion, the flash, the blast, the smoke and flying debris are awe-inspiring and adrenaline-inducing. Lighting a fuse, pulling a trigger or pressing the red button gives one direct control over all that power.

An explosion initiated by launching a projectile at an explosive target ads extra dimensions the fun of the "bang". It makes it more challenging (you have to actually hit the target), but also safer at the same time (no fiddling with wires, switches, ropes, blast caps, fuses, primers, etc.).

Explosives are no joke, but although some are quite safe and can be acquired and used legally (look up "Tannerite"), they are not affordable enough for my taste. Fortunately, there is an even safer and much cheaper way to generate a very loud explosion without using anything even remotely related to explosive or firearms. Enter the humble and ubiquitous plastic bottle.


Plastic bottles that held carbonated drinks are the best because they are designed to withstand high pressure. The size and shape of the bottle doesn't matter, but bigger ones make bigger explosions. The procedure to turn an ordinary bottle into an explosive one is very simple and easy. Just drill or punch a 1/2" hole in the bottle cap, install a tire valve in it and pump it up to about 100psi (my pressure gauges all end at that pressure, so I just pump a bit above it).

Once pumped up, the bottle is as hard as a rock and explodes very loudly when hit. The loudness of the explosion is comparable to a shot from a high powered rifle or a shotgun. You don't even have to use a firearm to trigger the explosion - a BB gun, arrow, slingshot or even a blow gun will do.

The explosion, although very loud indeed, is non-destructive and practically harmless. I've had a bottle explode right in front of me when I over-pressurized it and it didn't do anything but create a loud bang. I wear glasses when working with them though. The plastic pieces of the exploded bottle are not heavy, don't fly far at all and won't break the skin even at short distance, but I don't want any in my eyes. My experience is that these targets are perfectly safe if further than few feet away.

Other recommendations:

- Tie the caps/valve stems to something. They are almost infinitely reusable.

- Type, material and length of the valve stem are not important. I've used short and long rubber valve stems, straight and angled screw-on metal ones, and anything in between. Any valve stem for any type of tubeless tire will do fine, providing you drill the appropriate size hole in the bottle cap.

- There are commercial versions of these bottle caps out there. They are no better quality than DIY ones, don't last any longer and are much more expensive.

- Some people create more/less elaborate stands for these targets to avoid loosing the caps and make them stay upright. I found that hanging them or tying them to something is much simpler, cheaper and easier.

- No glue is necessary, period. If the cap is not holding pressure, use a different (thicker) cap or drill a smaller hole. 1/2" hole works very well for me - it takes a little effort to pull the valve stem through it, but it's a tight fit and doesn't leak.

These are the same bottles, the left one is just pumped to 100psi :)

Saturday, May 26, 2018

Stumbling through the Internet is dead :(

O how I envy people that have never used StumbleUpon, the same people I felt sorry for for over a decade. They are not going to miss discovering a seemingly endless stream of new content on the Internet that fits their interests, finding gems they will otherwise never stumble upon themselves. They will continue to be fed by links from sites they frequent, "top ten" lists compiled by someone else and whatever lands in their Twitter/Facebook feed. For over a decade I've been stumbling upon tens of thousands of interesting articles, videos and other content that I wouldn't otherwise find even if I knew I wanted it. Now that this service is shutting down, the way I spend time in cyberspace will abruptly and drastically change. It's a fact of life that things change and sometimes good things die for no good reason, but this is the first time I will truly miss an Internet service. What bothers me the most is that SU is not surpassed by competition or rendered obsolete by an advancement in technology. As far as I know, it was one of a kind. It's hard to explain to those that never used StumbleUpon, but let's say I'll have to drastically re-think the way I surf the Internet.

As eloquently said in this article that I (oh the irony!) just stumbled upon by clicking on the SU button like many times before:

Its death isn’t just saying goodbye to what feels like a bygone era of internet exploration, but bidding a final farewell to a time when curation didn’t dominate our online day-to-day.

Friday, May 25, 2018

James Bay Road, take 3

It's time for another mini adventure. I'll be revisiting the awesome remoteness that is the James Bay Road, this time with some wilderness camping to spice things up. It's one of those experiences that you have to live to appreciate. 386Km between two gas stations. 620Km from town to town (if you can consider 280 residents a town). Enormous hydroelectric dam and generation station. Caribou steaks. This is the land of the giants - everything but trees is mindbogglingly enormous.

I've done it twice before. The first time almost ten years ago on the Bandit while leading a group of five riders. Second time was in a car with my wife Duda. This time I'm taking the scooter and joining three other riders from MC Tesla. Stay tuned for pictures and report, but in the mean time check the albums from previous trips.