Victor and I have been wanting to make an electric motorcycle for the longest time. This summer we actually started planning and budgeting everything out. over the last couple of months we had been craiglisting and going over different places in MA to spec out bike but couldn't find an appropiate one.About 2-3 weeks ago we were fortunate to receive techX project funding. We got $500 funding that we decided to put towards the frame acquisition. We intensified our craiglist search and last week we found some guy in dedham that had a bunch of bikes with blown engines he was willing to sell to us. We visited his sketchy ass shop (seriously, it looked like an abandoned warehouse from outside) and we found a kawasaki ZX-6R that we liked.
proud parents!
We brought the frame back to MIT and the next day starting gutting the bike.
We brought the frame back to MIT...
...and the next day starting gutting the bike.
taking out the carbs
taking off the radiators
Time to take out the engine!
This turned out to be a much tougher job than we expected even considering we had 5 people (plus a camera-man) working on this.
Let's try to lift the whole bike upwards.
Hmmm, that didn't work...How the hell did they even get this engine inside there in the first place?!
Let's try to lift only the back....
After several different attempts we finally managed to separate the engine from the chassis.
Finally the engine is out!
Couldn't let that snapchat disappear
Look at all that space!
SO HEAVY.
Taking off the engine was a cool and rather challenging task, we put a jack and a piece of wood under the bike and then unbolted the engine and then lifted the bike off the engine. This last part was especially tricky given the weird shape engines have. Nevertheless, after about 3 hours we were done! Thanks to Esther M., George H, Heidi B., Charlesg and Rachel D.C. for their help in the gutting!We took all the stock fairings off cause they were in pretty crappy condition and we are gonna buy a body kit for the bike. Here are some options we found: http://tinyurl.com/cholocycle. I put up a poll to ask our friends on fb what color the bike should be. We got pretty hilarious responses, check them out below:Roberto and I went to N52 today and laser-cutted a cardboard mock-up of one of the batteries we are considering. We tried several configurations. Our two main concerns are that we need to leave space for the motor (modeled as the red circle in the first picture) and we want the batteries as low as possible for a lower center of mass.
Probably the best configuration
Maybe vertical?
This might actually work too. Clearance worries me a little though
We considered this for a second
Until we realized where all the weight of the bike would go if we drop choloCycle.
With the frame gutted, I started the mechanical design for the battery and motor holder. I was looking for some CAD for the ninja and stumbled upon this gem. A guy named Daniel Nguyen made a CAD of a ninja for his Intro to Cad class in UCLA. He intended to CAD the 2009 Ninja but he used the specs from a service manual for the 2002 model, which is the model we bought! I emailed daniel and he was gracious enough to let us have the CAD! Woohooo!We imported the CAD to solidworks and got rid of fairings and engines and exhaust etc and gave it some colors.
So pretty!
We mainly need the frame CAD so we can fit batteries and motors and whatever mounts we have.We are in the process of buying more stuff for the motorcycle (like motor and trying to get some batteries). We'll keep posting stuff during the build! Any questions let us know in the comments below.
As part of MIT IAP (Independent Activities Period) I took part in an Impractical Bicycle Dynamics Class. The class was led by Jack Whipple (D-lab Shop Manager) and Mars (Crazy Bike Expert), the point of this class was to create unconventional bicycles that were still somewhat rideable.
The class had 4 teams of 2 people each. The bikes constructed were:
1. (My team) "Bucky" A bicycle where arms provide propulsion and legs provide steering.
2. Snowmobike: A pedal powered contraption with a huge snowmobile tanktread.
3. Chopper: A chopper style bicycle.
4. Tall+Cargo: A tall bike that also has space for cargo.
You can find more details on each bike at the class website: aibd.mit.edu.
During the last day of class we had a small crazy bikes party outside of N51, here is a small video of the most incredible moment of that day, MARS RIDING BUCKY!
Many thanks to the instructors of the class for putting it together! I really hope AIBD becomes an IAP classic at MIT and as a result that the bicycle hacking community at MIT grows!
About a month ago one of my professors invited me to be part of a speaker building seminar with Bose. The purpose of this seminar was to expose us to the kind of stuff that Bose does, learn some basic acoustic theory and build some speakers!
The seminar was amazing, the guys from Bose explained some really cool features they put into their products. They showed us this "magic sound wand" which they could use to point at some location and make sounds seem like if it was coming from there. It was kinda spooky but awesome. We also learned a bunch about the use of crossover to give you better sound quality. One of the coolest things they showed was how they designed a new type of speaker cone which exhibits no parasitic harmonics under the audible range and thus was able to produce a pure note much better than a normal speaker cone. (I wish I had a video of this but they had a strobe going in the demo, so it was hard to film).
pink cone has parasitic modes, waffle cone (blue) gives you a much more pure note and no parasitics
bose dude holding the magic sound wand
The speaker building part was pretty fun too! We build two speaker cabinets out of PVC and MDF. At the end of the seminar we all put our speakers together and were able to play a 30 track piece in lobby 13!
As some of you know over the summer I became super interested in Magnetic Levitation. I started reading/learning about it and got super excited. I bought a maglev kit from Guy Marsden and it was super cool to see it levitate a pen.
Currently I am working on my own design using a switching mode converter and some analog feedback. Fun fact: it turns out that my Master's Thesis is going to be on modeling and control of Magnetic Bearings!
The previous examples I have mentioned are examples of active magnetic levitation, where a controller regulates the position of an object via feedback. Another kind of MagLev that exists is passive maglev which requires no active feedback. Turns out you can build a stable maglev system with no active control using Diamagnetic materials.
Diamagnetism is the property some materials have to repel magnetic fields. It is normally not a very strong effect but it is enough to make sheets of Pyrolytic Graphite levitate over strong neodymium magnets. My graduate advisor and I have been trying to think of uses of diamagnetism however given the forces involved are so low that we have not found any "real world" uses! I started to try and think of non-industrial non-real world uses and I thought it would be awesome to build a chess or checkers board with pieces made of pyrolytic graphite that levitate over the board. However given that the rare earth magnets are so expensive I decided to go with making a TicTacToe board first. I call this new creation Tic Mag Toe (im very proud of this name jajajaj...). I built a prototype this weekend:
tic mag toe v1.0
Getting the magnet in the checkerboard configuration was a little tricky cause they are crazy strong. We also had the world's first tic-mag-toe match:
I won it and became the undefeated world champion of Tic-Mag-Toe! However 10 minutes later Harry beat me twice... thus losing my glorious title to Canada.
My next step is to encase the magnet board into a nice laser cut frame and figure out a way to make nicer playing pieces. Then when I get enough money I'll go for the checkers board and maybe the chess board! For those of you wondering I got the supplies from http://www.kjmagnetics.com/ the best source for strong magnets I could find online!
A lot of you have probably noticed that if you put 1 object in the microwave for X amount of time, then the temperature of the object goes up by some amount, however if you put two of the same objects for the same amount of time then each object will be individually less hot than in the first case. To me this was always an obvious fact that I learned from my early teenage years heating up tortillas in the microwave (I use tortillas as the example because it's funny cause I'm Latino).
At MIT I have learned that this is not an obvious fact for some people, one time during my junior year I had an argument with a freshman on the subject. He was convinced that if we put two sandwiches in the microwave for the same time as one, all three sandwiches will end up with the same temperature. I quickly tried to correct him but he gave me some stupid explanation on how the air will not heat up as much of you put two things instead of one thus making the efficiency higher blah blah blah... I tried to appeal to his inner scientist/engineer and talked about the first law of thermodynamics applied to microwaves but that did not work so then i just made fun of him which made him get kinda mad (sounds like I was being mean, but HEY! he asked for it! never mess with the FIRST LAW)
A couple of weeks ago I had the same argument with a friend who argued that formation of standing waves blah blah blah and that the temperature rise under the two conditions would be the same. (this case he was arguing that putting two Maruchan soups will heat each up the same as just putting one in. I tried to give my Thermo First Law speech AGAIN but it did not work so I was forced to do some late night experimenting: please enjoy!
BAM! SCIENCE! I was right yet again, the single piece of bread exhibited a temp. rise that was 1.6 times greater than the two pieces of bread. However the question now is, why isn't that a factor 2? (half the mass means double temp. change for a same heat energy influx). That got me thinking on how the efficiency of the microwave varied with the properties of the food you cooked. (granted, the experimental set-up could be a total failure, thus I will be trying to repeat it in the next couple of days with cups of water instead of bread).
I started exploring the internets for answers I found some people that pretty much agreed with me (click here to see). Then some more people here. After this basic research it was obvious that the food properties (composition and geometry) and a lot to do with the linearity of the heating times, which adds an unknown for cooks in knowing how long to heat up things for. Interestingly fact: microwaves were initially unpopular because they were so "unpredictable" as far as heating times are concerned. (link to wikipedia microwave page
I will be conducting some more experiments of my own to check out how valid the linearity of heating times holds for things like water, bread and other random things.
Keep posted for the results! If you have any other "scientific experiments" or kitchen science questions that need to be answered please let me know and I'll do my best to address them in this blog!
Sorry for the long delay, as a quick life update: in the last couple months I have started grad school at MIT (its going amazing!) and i joined the Electric Vehicle Team after my ex-roomie Victober infected me with the Electric Vehicle Fever. At the start of the school year, Victor and I worked on TinyCycle, after we finished it Victor and I took RailScooter and TinyCycle to the NYC Maker Faire, it was a day full of annoying delays (oversleeping, subway breaking down, forgetting to charge EVs etc etc) however it was a lot of fun and all the MIT folks raced their EVs around the power series track (Vicky and I also raced our EVs in the streets of Manhattan (not recommended) but that is another story...).
This whole experience left me really wanting a tiny electric motorcycle, just like TinyCycle. I looked around on craigslist and emailed/called/texted a couple of folks but never got an answer. Luckily for me it turned out that one student group in 2.009 (MIT's Product Design Class) had taken apart a mini razor motorcycle as part of a class project and now it was sitting there alone in pieces. So i decided to do what every good samaritan would do... TAKE IT and give it a new home!. Thus my ChiquiCycle adventure started!
ChiquiCycle in Pieces
ChiquiCycle put together (no drive train or electronics)
It took me about a workday to put together all the parts I got from the 2.009 kids, it turns out they had lost the handlebars, the steering axle and most of the hardware. I eventually grabbed some scooter handlebars from MITERS, turned new steering axle pieces myself and grabbed some metric hardware from the shop. The motorcycle was now ready for its electronics! I started by procuring all the important parts: Motor, Controller and batteries. I had my ex-roomie victor help me with the battery pack (please see his excellent tutorial on how to assemble a Li battery pack!). The motor I used was this one and I decided to use a sketchy brushless motor controller from China that victor had laying around (in the near future Victober and I are planning to write a paper on sizing your motor and controller for your pocket bicycle).
We aimed to make the drive train assembly as simple as possible. I used an aluminum L-bracket to mount the motor. We took the driving sprocket out of the old motor the motorcycle came with. These sprockets normally come with a D shaped hole so it can transmit torque. I was lucky that the size of the sprocket bore was an M8 (same as my motor) this saved me the time it would take to machine an adapter. I pressed a spacer on the shaft then sanded the shaft to give it a D profile, put the sprocket on the shaft and finally machined a collar to constrain the sprocket axially.
my drive-train assembly
close up of driving sprocket mounting
The controller mounting was pretty easy (i just reused the mounting holes for the original brushless controller.
ChiquiCycle Frame with batteries, motor and controller! ALMOST DONE!
At this point ChiquiCycle was ready to roll!
We did some test runs (videos pending...) and it was obvious that we needed the controller to output more current to make our ride more exciting! With the help of Charles we hacked the motor controller to output more current and added hall effect sensors for motor startup. The scooter handlebars were making it impossible to ride chiquicycle semi-comfortably so I changed them to bicycle handle bars. I added a couple more pieces of the original plastic body and a Tesla decal and this was the "final" product:
ENTER CHIQUICYLE! (videos will be posted soon)
fun fact: I posted the above picture to the Tesla facebook page hoping that it would give me the opportunity to work at Tesla in the near future! I got over 130 "likes" from random people! My hope is that Elon Musk sees it and offers me a job in Tesla!
I'd like to thank the people that helped me out with this project, namely Victor, Charles, Lauren, Rango and Harry!
my awesome pit crew! (lauren and rango)
This project along with Victober's TinyCycle has pushed several friends to buy a tiny motorcycle! We are in the process of creating the Pocket Motorcycle Squad (PMS) and we aim to have a techfair booth in early 2013. Here's a picture of Lauren's chopper and future member of PMS!
UPDATE: Here is an instructable for Chiquicycle! It has almost 30k views and it won 2nd place in a "cars and motorcycles" contest winning me a bottle of "water spot remover"
Last friday was the very first annual Tech Dinghy Challenge at the MIT Sailing Pavilion!
Next House (my old dorm) put together a team for this event full of craziness, sailing and burgers (how could I miss it!?) The competition consisted of getting a team of people and then everyone had to eat at least one burger in 5 minutes time then we had to cram as many people in a boat as possible (modifications were allowed) and then sail to the boston shore and come back! Points were awarded for burgers eaten, people in boat and crossing time.
We modified the tech (sailboat) by adding outriggers with inflatables. We built it desperately in the hours before the competition and honestly I was not sure if it was going to work but PROPS to the designers, they did an awesome job and our modifications were rock solid! Here is a pic of us before putting the boat in the water...
I was fortunate enough to skipper the boat. With so many people on board I had to make use of every resource possible to steer the boat (rudder, sail... even paddles!). IT WAS AWESOME! We had so many sailboats around us taking pictures and throwing water at us! Some incompetent boats even crashed into us which made me extremely mad (why on earth would you crash into a boat with 30 people that is almost sinking?) at some point I was about to jump into the water swim into their boat and pull their rudder out for vengeance. However I desisted...
But my FAVORITE PART was the grand finale, and as videos speak louder than words...
Awesome right? Props to Jeff from the dockstaff who sank us with the wake of his boat! We eventually had to bail the boat to prevent it from sinking into the charles for ever ajajajajja!
I can't wait for next year's challenge! Big shout out to the next house team!
Roberto and I went to N52 today and laser-cutted a cardboard mock-up of one of the batteries we are considering. We tried several configurations. Our two main concerns are that we need to leave space for the motor (modeled as the red circle in the first picture) and we want the batteries as low as possible for a lower center of mass. 
