In my opinion, these are the best of the best of survival and preparedness articles gleaned from the 'net.

Please visit the originating sites to see more like them.

Friday, November 6, 2009

Best Weapon for Home Defense

Home defense is something we all should be concerned with. Whether you live in an apartment, own a home, or live with your parents; being prepared to defend the home in the event of an invasion is very important. There are precautionary measures you can take when dealing with home defense. I talked about one in my previous post about reinforcing entry doors. This is an important part of home defense because if your door can't be kicked in the likelihood of a break in drops dramatically.

As far as weapons go the best weapon for home defense is a shotgun. Shotguns are cheap, powerful, and easy to use. The biggest advantage of using a shotgun for home defense is the low muzzle velocity. The shotgun rounds are less likely to go through walls and potentially harm family members or neighbors. Shotgun rounds have a spread which makes hitting the target easier. Shotguns also have a fear factor to them. Most intruders will run for the hills when they hear you chamber a round.

I don't condone the use of violence, but if someone breaks into your home you have the right to defend yourself and your family. A shotgun is your best bet when wanting to cover home defense. Shotguns are also cheap and will last forever if taken care of. A used 12 gauge shotgun can be had for $200. A few boxes of shells and you're ready to defend your home. Make sure you get some practice with it at the range to know how to operate it and effectively use it.


Simple Survival Tips - Additional Uses for Salt

Although many people may not be aware of it, simple table salt has a great number of uses other than seasoning food. Salt is a fairly common food storage item and if protected from excessive moisture will last almost indefinitely. Salt is a main ingredient for seasoning many types of food but has a wide variety of other uses. Here are just a few of the additional uses for salt.

Additional Uses for Salt

1. Soak stained bandanas in salt water before washing to help eliminate the stains.

2. Soak fish in salt water prior to cleaning. The scales will come off easier.

3. Test eggs for freshness in a cup of salt water. Fresh eggs sink and bad ones float.

4. Add salt to your boiling water when cooking eggs to keep a cracked egg in its shell.

5. Soak toothbrushes in salt water before the first use. It will help them last longer.

6. Use salt and crushed ice to clean burnt coffee from your pot.

7. Soak nuts in salt brine overnight and they will be easier to crack out of their shells.

8. Wooden clothespins boiled in salt water before using them will last longer.

9. Clean brass and copper with a paste made of salt, vinegar and flour.

10. Lightly salted water makes a very effective mouthwash.

11. Remove odors from your kitchen sponges by soaking them in salt water.

12. Adding a few raw potatoes to stews or soups will decrease the saltiness if over seasoned.

13. After peeling fruits they can be placed in lightly salted water to avoid discoloring.

14. Equal parts of salt and baking soda make an excellent toothpaste substitute.

15. A pinch of salt will improve the flavor of cocoa.

16. Mix one part salt to four parts alcohol to help remove grease stains in clothing.

17. A mixture of salt and lemon juice can help to remove mildew stains.

18. Sprinkling salt on freshly cut tree stumps will help dry them out and decay faster.

19. You can polish an old kerosene lamp with salt and give it a new look.

20. A mixture of salt and turpentine can be used to clean porcelain fixtures.

There are many other ways you can use salt other than for seasoning your food and these are just a few. There is no doubt you probably have a few unique uses for salt that you use that are equally good.

Got another use for salt?

Staying above the water line!



Intro To Making A Cycle Powered Generator

Via Steward Community Woodland

Note: This is NOT a set of step-by-step instructions for a specific design. We have built quite a few cycle powered generators, each one is different, based on what bits we had available. This guide is intended to give you pointers and pass on some of what we have learned, but ultimately it is your ingenuity and the materials and tools available to you that will dictate the design.

The basic requirements:

1. Cycle and stand: You need pedals on a crank, and something comfortable to sit on. Additionally the whole thing needs to be made stable in some way so that it doesn't fall over or move about when in use.

2. Generator and regulator: You need an electrical generator that is made to turn at rotational speeds high enough to produce the required output. You probably need some way to regulate the output to a reasonable speed.

3. Drive and gearing: The crank and the generator need to be linked together in some way and you almost certainly need some form of gearing to reach the desired speed of rotation.

Cycle and stand:

-Old bikes vs. exercise bikes.

Unwanted bikes can be very cheap (ie. free) and easy to obtain. They have good bearings so little power is wasted overcoming friction and they often have large back wheels that make good pulleys (you will see why that could be important later). However, you will need to make some form of stand to make the bike stay upright and stationary while pedaled. Further more, it makes sense environmentally and ethically that, if the bike works or can be made to work, it is better being used as a bike (thus replacing more environmentally destructive forms of transport). There are always people who want working bikes, there are charities that send thousands of serviceable bikes to the third world every year.

Exercise bikes are an interesting option. Loads of people have bought exercise bikes thinking they would actually use them but the novelty soon wears off and they become a waste of space. The free ads papers, boot sales and recycling centers are full of them and many end up in the landfill. This means that they can be cheap to obtain. You won’t have to build a stand because they already have one and they are easily adjustable to fit different people. Additionally, the fly wheel will prove useful. But beware - not all exercise bikes are good for making cycle generators. Many have no bearings and many really cheap ones have no fly wheel but rely on friction on the crank to provide the ‘exercise’. There is very little scope for using such a device.

Generator and regulator:

-Alternators vs. Permanent magnet motors

The world is full of an increasing number of cars - built quick and cheap, used and abused and then sent to the junk yard. There are therefore loads of old alternators waiting to provide a regulated 13.4 volts DC to whoever can rotate them fast enough. You acquire them very cheaply (or free) and they even come with brackets and a pulley already fitted. Alternators provide an obvious source of power and so many people have used them in home made cycle generators or wind power systems. However alternators require very high rotation speeds which mean you need to provide very high gearing ratios. Further more, they need ‘exciting’ and are designed to provide up to 500 watts while a person is likely to manage something more like 60 watts. This means that you need to provide some simple electronic wizardry to start the alternator generating any power at all and also to prevent it from demanding excessive amounts of power from the cyclist.

Permanent magnet motors are another option. They come in an amazing variety of shapes and sizes. We have used a Whirlpool washing machine motor with great success. We have also used motors out of old computer magnetic tape spools. You could use electric fan motors from cars. They can produce a couple of amps at 12 volts so using two of those with their shafts joined could be worth a try. Because of the variety of motors available their specifications will obviously also vary significantly (ie. the rotational speeds required, the output in terms of watts, the voltage range produced etc.). One thing you can be sure of is that the output of a generator built with one of these will need to be regulated in some way for most applications. The regulation could be in the form of a voltage regulating circuit or simply a large capacity battery placed in line to be charged (which should cause the output voltage to drop to little over the battery voltage).

Drive and gearing:

-Shafts, cogs, wheels, chains, and belts.

The pedals of your machine must somehow turn your chosen generator at a suitable speed. Your average cyclist will find it comfortable to pedal at around 60rpm (ie. one rotation of the pedals every second) and it would not be unreasonable to base your calculations on that figure. If you happen to have found a generator that produces your required output (eg .5amps worth of 12volts) at just 50 RPM then you could find a way to link the two without gearing. However the chances are you will need to step up the speed significantly.

Gearing could consist of a gearbox full of cogs. These are not easy to build but there are small gearboxes available to those with the initiative to find them. For example we found a hand cranked grinding disk with 20:1 gearing. You could use a simple rubber wheel on the shaft of your generator which is pressed against the rim of your bike's wheel/flywheel. The difference in circumference of the two wheels provides the ratio of the gearing you obtain. We used this method fairly successfully using a homemade wheel made out of wood and plastic hose but found that under heavy load slipping could occur and we were concerned that vibrations would reduce the life of the bearings and brushes in the motor.

With enough cogs and chains from old bikes you could multiply your gearing up to the desired level but it would be noisy and inefficient. Unless the gearing you require is between 3:1 and 9:1 you will probably have to use another method.

If you are using an alternator then it will need at least 1,800 RPM before it produces output. This would require a gearing ratio of about 30:1. When you consider that the highest ratio on your average bike provides about 3:1 (eg. 52 teeth to 14 teeth) then you see the potential problem with using alternators. The usual way to solve the problem is to use the back wheel of the bike as a massive pulley (assuming it is a racing bike with a 26 or 27 inch wheel). You then use a large fan belt to drive the (usually 3 inch) pulley on the alternator which means you provided an additional gearing ratio of about 9:1 and a total ratio of about 27:1. Belts big enough are not easy to find. They can be purchased fairly easily and if you are on a tight budget you can improvise with old stockings etc. If you wish to build a generator on these principles then there is a booklet available from the Campaign For Real Events which describes in detail how to do it.

We have successfully used a belt from the fly wheel of an exercise bike to a homemade pulley fitted to the motor. The flywheels tend to be about 14 inch diameter which isn't very big but the motors we have used require far lower speeds than alternators so the gearing ratio has proved more than adequate. We found suitable belts in old washing machines.

Where to get stuff:

Yard sales provide a good source of exercise bikes, unwanted bicycles and bicycle bits. Recycling centers can provide strange motors and gearing bits, washing machines (for belts, PM motors and pulleys). Junk yards and dumped cars provide alternators, fan belts, fan motors, pulleys, fuses, fuse boxes, wiring, switches etc.


Recent Comments

Grab This Widget

Popular Posts