Thursday, April 23, 2009

Make a simple compass

Make a simple compass
We've previously shown how to make stupidly simple compasses that float on water or spin on a smooth surface. Here's another method: sandwich a thread between two very strong magnets and hang it down for an instant compass.

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Thursday, April 16, 2009

Papercraft Wing Commander spaceships


Papercraft Wing Commander spaceships
POSTED BY CORY DOCTOROW, APRIL 15, 2009 10:52 PM | PERMALINK


Avi sez, "Paper Commander offers free downloadable pdfs of plans for paper models of cool spaceships from the Wing Commander universe. My favorite is the F-109 Vampire."
Paper Commander (Thanks, Avi!)

Tuesday, April 14, 2009

Littlbug Stove





Littlbug Stove

The Littlbug is a well-made, elegantly-efficient wood-burning stove that's a great alternative to the propane stoves often relied upon during Scouting trips. The energy put towards producing, transporting and disposing propane stove canisters is a growing problem for those who spend time outdoors. A high-efficiency wood-burning stove makes practical, ethical sense -- no need to haul around canisters, dispose of them, or put the burden on parks to go around collecting empties.


The Littlbug has draft holes in the base and the unique semi-circular pot supports form a baffle system that gives the stove a chimney effect and acts as a wind screen. It burns with a great deal more ferocity than a standard fire.



Maintaining the fire does demand more attention than a propane stove, but you'll use much less wood than the average campfire. The intensity of the heat is more difficult to moderate with the Littlbug, but some practice will improve our technique. On the whole, I've found the performance quite comparable to a propane stove: on a recent trip, our Littlbug Senior boiled five quarts of cold water in an eight quart pot in about twenty minutes -- this was in moderately-windy conditions, using somewhat damp sticks about 0.5 to 1.5 inches in diameter. Once the pot was at a high, rolling boil I cooked five pounds of sliced potatoes in about 20-30 minutes.

At $57, the Littlbug costs about as much or more than a propane stove, but the fuel is free. Before I purchased it, I was curious whether I could reverse-engineer the design to produce our own version and save a few dollars. I abandoned the idea as soon as I had the stove in my hands: It is constructed of stainless steel and would require pretty close tolerances to recreate properly. Not that one couldn't create a reasonable facsimile with tin cans and a bit of ingenuity, but the Littlbug is so well thought-out and so well made it justifies the cost.

It is easy to assemble and provides a very stable platform for a heavy pot (w/potatoes my pot weighs about 15 pounds). The stove is cool to the touch in a few minutes after the the fire is out. It then packs into a sturdy bag that keeps the soot contained. Of course, that's one of the minor down sides: in addition to collecting fuel, you have to deal with a sooty pot (naturally, a little dish soap applied to the outside of the pot before cooking helps). The Littlbug can also be adapted for alcohol stoves or Sterno cans. I don't know that we will ever use this feature, but it adds to the stove's utility.

The previously-reviewed Sierra has been around for twenty years or so and has developed a band of adherents (I have never used it). The Sierra is a much smaller stove than the Littlbug SR and uses a battery-driven fan to provide draft for the fire. There are actually several incarnations/clones of the Sierra out there -- I just never thought that schlepping a battery run stove around made a whole lot of sense. The Littlbug is simple, with no batteries to replace or fan to go all Murphy on you. It also has a short learning curve and will likely last forever. Also, not unlike most people who go car-camping or backpacking, Scouts are cooking in groups of six or eight. I have a stove similar to the previously-reviewed Snow Peak Gigapower that I carry backpacking, but with Scouts, since we are using bigger pots, it makes sense to use bigger stoves because the weight and bulk is shared between several people. Still, the stove does make sense for backpacking. At 19 ounces (plus 3.3 oz for the pouch), it compares favorably to the one-pound stoves and one-pound canisters our Patrols usually carry. The only improvement I can suggest is a shield that surrounds the pot to concentrate heat, something easily made from some aluminum roof flashing. I would imagine it would significantly increase the stove's efficiency.

Littlbug also offers a fire pan and chain kit for hanging the stove. I am dubious that hanging the stove is a good idea, especially for Scouts, but we will add a suitable fire pan to further reduce the impact of the stove. The addition of a suitable round grill will complete our kit allowing us to use the stove for grilling. I'm outfitting three crews for a canoe trip in Canada this summer, and plan to purchase to more Littlbug Seniors (Since my first purchase, I learned Littlebug offers discounts for Scout troops). The stoves will be a significant improvement over the fire grates we usually carry and make cooking meals over the fire much faster and more efficient.



Littlbug Stove - Senior
$57
Available from Littlebug

Inventor turns cardboard boxes into eco-friendly oven



(CNN) -- When Jon Bohmer sat down with his two little girls for a simple project they could work on together, he didn't realize they'd hit upon a solution to one of the world's biggest problems for just $5: A solar-powered oven.


Inventor Jon Bohmer with the oven he has made out of a cardboard box.

The ingeniously simple design uses two cardboard boxes, one inside the other, and an acrylic cover that lets in the sun's rays and traps them.

Black paint on the inner box, and silver foil on the outer one, help concentrate the heat. The trapped rays make the inside hot enough to cook casseroles, bake bread and boil water.

What the box also does is eliminate the need in developing countries for rural residents to cut down trees for firewood. About 3 billion people around the world do so, adding to deforestation and, in turn, global warming.

By allowing users to boil water, the simple device could also potentially save the millions of children who die from drinking unclean water.

Bohmer's invention on Thursday won the FT Climate Change Challenge, which sought to find and publicize the most innovative and practical solution to climate change.

"A lot of scientists are working on ways to send people to Mars. I was looking for something a little more grassroots, a little simpler," Bohmer said Thursday.

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Bohmer's contest win notwithstanding, solar cooking with a cardboard oven isn't new. Two American women, Barbara Kerr and Sherry Cole, were the solar box cooker's first serious promoters in the 1970s. They and others joined forces to create the non-profit Solar Cookers International -- originally called Solar Box Cookers International -- in 1987.

Further, the organization's executive director, Patrick Widner, said that the plans for a solar box cooker were found in a book published by the Peace Corps in the 1960s.

"We are pleased that Mr. Bohmer has taken up the cause and interest of the 95 member organizations and 160 individuals of the Solar Cookers Worldwide Network," Widner said. "It would be a pleasure to work with Mr. Bohmer in Kenya where we have been promoting the use of solar cookers for ten years."

Bohmer, a Norwegian-born entrepreneur based in Kenya, said he also had been looking at solutions "way too complex, for way too long."

"This took me about a weekend, and it worked on the first try," Bohmer said. "It's mind-boggling how simple it is."

The contest was organized by the Forum for the Future -- a sustainable development charity -- and the Financial Times newspaper. Among the judges were British business magnate Richard Branson and environmentalist Rajendra Pachauri. The public also voted on the finalists.

Bohmer's invention beat about 300 other entries, including a machine that turns wood and other organic material into charcoal, wheel covers that make trucks more fuel efficient by reducing drag, and a feed supplement for livestock that reduces the methane they emit by 15 percent.

Bohmer named his invention the Kyoto Box, after the international environmental treaty to reduce global warming.

The box can be produced in existing cardboard factories. It has gone into production in a factory in Nairobi, Kenya, that can churn out about 2.5 million boxes a month.

Bohmer has also designed a more durable version, made from recycled plastic, which can be produced just as cheaply.

He envisions such cardboard ovens being distributed throughout rural Africa.

"In the West, we cook with electricity, so it's easy to ignore this problem," he said. "But half the world's population is still living in a stone age. The only way for them to cook is to make a fire.

"I don't want to see another 80-year-old woman carrying 20 kilos of firewood on her back. Maybe we don't have to.

Friday, April 03, 2009

The Story Of Ketchup

How the tomato found its true calling. Here is a good article on the history of ketchup in case anybody cared!

How to Make Water in The Desert

Wikihow has some good articles this week. This one on making a solar still. It works not only in the desert but also in any hot/summer environment. It's very good survival knowledge.

How To Identify Trees In Winter

Anther article from wiki how on how to identify trees during the winter. This info can come in very handy for Scouting in the outdoors.

How To Make A Duct Tape Pencil Case

Here's a good article on how to make a duct tape pencil case. use colored duct tape, you can have it any color you want.

In a slump, camping comes into vogue

Story Highlights
  • Camping appears to be back in style because of the recession
  • A college student plans a camping trip because urban vacations are too expensive
  • REI says family tent sales this month are up 28 percent over last year
  • Next Article in Travel »
By John D. Sutter
CNN
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(CNN) -- Susan Lanier has always enjoyed getting out of her urban home in Chicago, Illinois.

Camping is a cheap travel alternative to staying in a hotel.

Camping is a cheap travel alternative to staying in a hotel.

But her travel plan for this spring -- which includes riding on a Greyhound bus and camping in a national park -- is a new, more frugal version of how the 22-year-old would normally spend a vacation.

"I'm in school and usually I'll do some sort of trip, but usually I'll go to a beach or something or I'll fly to New York," she said by phone while hitching a ride on a band's tour bus, headed toward the Smoky Mountains of Tennessee. "But [finances have] just been tight, and this is a cheap way to get out of the city and do something fun."

With the economy in a slump, camping seems to be grabbing a new foothold in the travel industry. Once considered by many to be an activity for nerdy families, nature geeks and Boy Scouts, sleeping outside in a tent has become chic -- likely because it is so much cheaper than paying for a hotel room.

The activity also strikes a new chord with Americans who want to get back to basics after an era of excess and overspending.

Outdoor camping's popularity jumped 7.4 percent between 2007 and 2008, according to a report from the Sporting Goods Manufacturers Association. Overnight backpacking is up 18.5 percent, the report said.

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"That's a significant change," said Mike May, the association's spokesman. "One thing about camping is once you buy a tent, you don't need to buy another one for a long time. It can be an inexpensive way to spend some recreational time."

The group estimated there are 33.7 million campers in the country. May said he expects that number to continue to increase this year.

REI, the outdoor equipment company, said tent and sleeping bag sales are up this season, particularly when it comes to larger tents designed for three- and four-person families.

So far this spring, family tent sales are up 14 percent over last year, said Rick Meade, REI's product manager for sleeping bags and tents. For March, sales are up 28 percent over the same month in 2008.

"We have a great sense that there is a resurgent interest in [camping], especially on the family camping side," Meade said.

State parks are among the cheapest places to sleep under the stars.

Many of the parks, which either are free or charge entry fees of about $10 per day, are seeing increased interest from tourists and campers, according to Phil McKnelly, executive director of the National Association of State Park Directors.

"Whether you're talking about wanting to go to the ocean or the mountains, those are kinds of activities that can be done in a state park at a relatively low cost," he said. "For the cost of one of two nights in a hotel, you can spend a week in a state park."

Still, the financial crisis is affecting states' abilities to manage their park systems.

Most states have seen their parks budgets slashed by 10 to 15 percent, McKnelly said. That means fewer park employees, which translates into dirtier restrooms and trails blocked by fallen trees, he said.

The Texas Parks and Wildlife Department began offering classes for first-time campers last year. Interest in the program, which teaches basic skills like how to pitch a tent and dispose of trash in an eco-friendly way, has been high, said Tom Harvey, spokesman for the department.

So far the state has offered the program to more than 1,200 people, according to the department. iReport.com: How are you having fun for free?

"We'll hold them by the hand and we'll show 'em how to pitch a tent," he said. "It's been very popular."

Harvey said the camping movement is geared at more than recreation. People who live in cities often don't understand natural systems, which he said can lead to detached and unhappy lives.

"We are now, most of us, creatures of the urban jungle and we're losing our connection with the natural world, with reality," he said, adding that camping helps fix that.

In California, many state parks are booked well into the spring, said Sheryl Watson, spokeswoman for California State Parks.

On the first day reservations became available, 20,407 people reserved a July trip to a California state park, she said. That's up nearly 13 percent over last year's reservation numbers. By comparison, reservations were up 4 percent from 2007 to 2008.

Watson said parks near the state's urban centers are especially popular, because camping can be an inexpensive way for someone to visit a city like San Francisco, where hotels can cost 10 or 20 times the price of a camping spot.

That idea also applies to international level, where hotel costs can add up over a long stay.

The economy has given people like Lanier, the student in Chicago, an excuse to spend more time outdoors. The last time she went camping was six years ago, in high school.

Lanier said she bikes around Chicago often, but the city's best outdoor offering is Lake Michigan, and that still feels pretty urban, she said.

Lanier is studying fiction writing in a masters' program, and said she plans to record her campfire conversations with her traveling buddy, who plays in a band called I Need Sleep and will also offer some free musical entertainment.

She hitched a ride on the band's tour bus to Tennessee. The only part of the trip she dreads is the $50, 18-hour return trip by Greyhound bus.

While she felt pressured into the trip by the economy, she said that may be a good thing in the end.

"It just seems like an adventure -- something different," she said.

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