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MakeShift 19 deadline November 20th

19-Nov-09

makeshift-19-screenshot.jpg

The deadline for submitting your solution to the MakeShift challenge from MAKE Volume 19 is fast approaching. Napping in an ocean kayak is generally never a good idea, but what would you do if you stuck in this predicament? Work your brain, get creative, and win stuff! Here’s the MakeShift in its entirety:

The Scenario: You’re an experienced and avid open-ocean kayaker, setting off early from your favorite coastal launch point for a restorative and invigorating day on the water. You’ve checked with the Weather Channel and the National Weather Service, and both have predicted sunny weather, slight clouds, and virtually no wind. So, after donning some sunblock and checking your gear and supplies, you’re off.

The launching goes OK, but you take on a little water fighting the breakers. When you finally clear them, you paddle steadily until you’re about 1 mile offshore, which you confirm with your GPS. Venturing out a little farther, you paddle parallel to the shore for a few hours. Then, adjusting your life vest and seat cushion to make yourself more comfortable, you stop to relax and enjoy the scenery, but between the warm sunshine, the gentle roll of the ocean, and the hypnotically reflective water, you nod off.

The Challenge: When you wake several hours later, the ocean is choppy and a strong, southerly wind has picked up, which has pushed you at least 3 miles from shore and continues to grow in strength. You dig for your cellphone just in case you need to call for help, only to discover that the saltwater you took on earlier has rendered it useless. You paddle hard for shore, but even after a relentless hour, the winds and currents seem to erase all your progress and the tall beachfront hotels are becoming mere dots on the horizon. You realize more paddling might be fruitless and only exhaust you completely. So what do you do now?

What You’ve Got: Two gallons of fresh drinking water and a basic survival kit with a compass, a lightweight 6×7-foot survival blanket (silvered on one side and dark on the other, in a pouch), heavy-duty nylon tape, and a coil of thin but strong nylon rope. You’ve also got a Swiss Army knife (or similar tool), some marine binoculars, a GPS unit, your waterlogged cellphone, some basic medical supplies in their own self-contained marine emergency medical kit, and an extra paddle. You also have a lightweight, waterproof windbreaker and some foul-weather gear stashed in the small but useful front storage compartment.

To Enter: Send a detailed description of your MakeShift solution with sketches and/or photos to makeshift@makezine.com by Nov. 20, 2009. If duplicate solutions are submitted, the winner will be determined by the quality of the explanation and presentation. The most plausible and most creative solutions will each win a MAKE T-shirt and a MAKE Pocket Ref. Think positive and include your shirt size and contact information with your solution. Good luck! For readers’ solutions to previous MakeShift challenges, visit makezine.com/makeshift.

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How to build a catapult part 2: triggers and releases

24-Aug-09

Bill Gurstelle is your MAKEcation counselor for the make-a-trebuchet Family Challenge. Build a trebuchet and post pictures tagged “MAKEcation” in the MAKE Flickr pool to enter to win a $100 Maker Shed gift certificate!

More in my series of posts on How to Build a Catapult. In this post, I discuss Catapults, Ballistas, Trebuchets and the Triggers, Releases, and Latches that operate them.

I receive quite a few inquiries about making catapults and trebuchets. And among the most frequent questions is: how do I build the trigger? It’s an important question.

Catapults are fun and educational to build and operate. When building a catapult, trebuchet, ballista, mangonel, or any of the hundred names by which such hurling machines are known, you’ll find out that the mechanism that releases the throwing arm is often the most complicated part of the machine.

You may build your own release, which is tricky because you need to design the latch so that it will release reliably under full load. Actually, you can get pretty creative about triggers.

But considering how cheap and easy it is to buy one, it might make more sense to use one of the commercial solutions below, and spend your time working on the other aspects of the machine.I’ve spent time researching the best triggers and releases for small catapults. There are three good, off-the-shelf solutions: The archer’s arrow release, the sailor’s pelican hook, and the horse trainer’s panic snap.

Archer’s Arrow Release:

arrow release.jpg

This is the premier solution. Works dependably, quickly and very smoothly. It costs a bit more, but of all the catapult releases I’ve tried, I like this one the best. Find it at a sporting goods store with an archery department, or find it online.

Sailor’s Pelican Hook:

pelican hook.jpg

This is another excellent hurling machine trigger. Its normal use is in sailing, where it is used to securely hold and release lines and ropes. Basically a pelican hook is a hinged hook that can be quickly secured or released by a sliding ring. It is quite a bit less expensive than an arrow release, but it holds securely under load. The downside is that they can be awkward to release sometimes. Find it at a boating store or online.

Horse Trainer’s Panic Snap:

panic snap.jpg

A panic snap is a mechanism often used between a lead and a horse’s harness. They are decent catapult triggers because they can be disconnected under load. A panic snap is specially built so that the latching mechanism is separate from the load bearing structure. Just pull back on the latch and the load releases. Very inexpensive, but not as smooth or dependable as the arrow release. Find it at a tack shop or online.

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MAKEcations: deadline extended!

19-Aug-09

Back to school is fast approaching, so it’s time to get in one more family project before the summer’s over. We’ve extended the MAKEcation challenge deadline to September 9, two days after you’re done enjoying your Labor Day weekend. We have $100 gift certificates to the Maker Shed just waiting for you to come and grab them when your family (we use the term loosely) learns to solder, hacks a cooler, or builds a backyard trebuchet. All you have to do is add photos of your project to the MAKE Flickr pool tagged “MAKEcation” to enter! If you get stuck, have questions, or just want to chat, email campcounselor@makezine.com. What are you waiting for?

Top prize in each category: $100 Maker Shed Gift Certificate

Runners up: The Best of MAKE or The Best of Instructables

Teach your family to solder:

Cooler hacking challenge:

Family trebuchet challenge:

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