After the big winds a few weeks ago, we decided to build some kites for our latest Castlemaker Kids project. For those not familiar with tetrahedral kites, the engineering behind the geometric design and history of Alexander Graham Bell’s involvement is interesting.
Alexander Graham Bell saw the Tetrahedral Kite as a way of getting to manned flight. Just before the turn of the 20th century, there was a big debate in the scientific community on whether human flight was possible. Kites were being used to test aerodynamics and flight stability for possible aircraft. After Lawrence Hargrave developed the box kite in 1893, Mr. Bell designed a tetrahedral kite in 1895, which was not only very stable but simple to expand and easy to fly. Mr. Bell wrote a National Geographic article in June 1903 on his new kite structure that explains the development and gives a comparison with other designs. He eventually created a steamboat towed 12 meter (40’) long 3,393 cell model in 1907 that carried a man 51 meters (168’) above the water!
There are lots of variations today – the design we chose was built using drinking straws, string, and tissue paper (Tyvek also works). Individual tetrahedrons are made out of straws, tissue paper is put on 2 sides, and then they are tied together in groups of 4 to make a building block. The 4 cell model can fly by itself but if you get ambitious 10 cell modules work well too, all of which could be attached together into larger tetrahedral kites. Instructions for a simple 4 cell model can be found here, but it can be tailored to the supplies available and what you’d like to build. To help with the kids’ attention span (and time constraints) we stayed with a 4 cell model.
Finding non-bendy straws locally turned out to be a challenge, each 4 cell module takes 24 straws. The rest of the components are pretty straight forward, it’s just a matter of time and patience to assemble a kite. Once you figure out the pattern, the most difficult part is tying together the individual tetrahedrons with the string, in the version we used. There are several other versions if you search the internet, including one that uses flexible drinking straws, but the individual cells in the folding model are wired together. This makes assembly a bit more challenging and I found it harder to put and keep together, although the folding feature is nice.
A tetrahedral kite’s advantage is the low weight to sail ratio. Because of the shared trusses, as you add additional cells performance improves – what Bell saw in this design over other types of kites. And it’s easy to put multicolored paper on the kite, making a good looking kite. Don’t be surprised if you see some larger ones in the sky this summer in Putnam County!
A high school Principles of Engineering class I visited last week is providing a great example using a 3D printer to teach the engineering design process and critical thinking.
Mr. Shields at Greencastle High School inherited a 3D printer when he took over a new class this winter. I had contacted him to see if he or his students were interested in a community 3D printing competition that Castlemakers is putting together. He was able to take the basic idea we had and turn it into valuable classroom experience for the students. Plus provide a pilot test for a future community 3D printing event!
The challenge was to 3D print a functioning device that would make noise or music. They had to walk through a seven step design process, print the part, and then write a report that included evaluation of their prototype by others.
The projects they made were impressive with whistles, a drum, ribbiting frog, and of course musical instruments. While all of them were good, perhaps the most impressive sounding was a musical instrument that 2 students collaborated on – Mattia designing and making a mouthpiece while Dalton did a horn. You can hear the mouthpiece/horn in this video.
Piaget would be proud of the constructivist learning going on Mr. Shields’ classroom. It really shows how hands on learning and the maker movement can improve learning in the classroom. IU School of Education is embracing the movement, opening a new a makerspace(The MILL) last fall in the Wendell Wright Education building just for teachers. Not all learning goes on in a classroom however, and people need tools/equipment and a place to practice – one of the reasons that Castlemakers feels Putnam County needs a makerspace.
Another good regional resource for kids STEM activities is Wonderlab in Bloomington, Indiana. Besides being a fun place to visit, they also offer summer day camps for kids through 6th grade (and mentoring opportunities for those older) that can range from crazy contraptions and electronics/engineering to TV technology. They also have occasional special events, often on weekends or during school breaks, that anyone can sign up for.
Bloominglabs, the community makerspace in Bloomington, put on a 3 hour Brainbot building workshop over spring break at Wonderlab for kids and adults. Since we had some experience teaching kids to solder, ended up helping with the workshop and now helping to improve the workshop instructions. Bloominglabs also helps the Monroe County Library with speakers for the summer Make It Digital series, put on Makevention every year, and have an open shop night every Wednesday evening for those interested in making.
As we work towards creating a Putnam County makerspace, the robot building workshop is a good example of what Castlemakers will offer. Of course a makerspace is much more than just classes. But the goal is sharing/helping people to learn skills with arduinos/microcontrollers, mechanical devices, 3D printers, and more. And with the right physical location that may include welding, woodworking, jewelry making… all things that makerspaces in other cities offer.