During the actual race, JSS cars must be attached to the race line. During the race then, the car will be guided the entire 20 meters by the wire. Please note, that in designing your guidance system, the race wire will NOT be detached from the starting block. Note to LBMS students – to qualify for the race, you must be able to put your car on the wire within 15 seconds. Click here for a movie how this might look.
- Sun azimuth / Altitude tables
Calculates the altitude of the sun an any given day as well as it’s compass heading (azimuth)
- Sun Earth Tools
Same as above, but more complicated and in-depth
- Keisan Online Calculator
Same as above. Use -5 for GMT and check daylight savings radio button
Transmission-Gears and Motor
Gear Calculation Excel File
Use the files below to calculate the diameter of the BEST size wheels (on the driven axle) for the combination of gears you’ve chosen.
If you use the 35mm wheels available in class, you’ll want to look at this frequency chart to see what gear combinations are optimum for that size wheel. Click here
Installing the gear on the axle
Motor specs: JSSSolarMadeMotorSpecs
Making wheels with Google Sketchup and the Makerbot 3D printer
Option A: follow this video on YouTube. Slightly difficult
Option B: Follow these series of YouTube Videos:
- Explanation of gear combination as it relates to the size of the driven wheel
- Using Google Sketchup to design a wheel for your JSS car – Part 1
- Using Google Sketchup to design a wheel for your JSS car – Part 2
Perhaps, you could use the pictures below with dimensions to design/print your own 3D printed wheel support. After printing, these can be glued to a chassis
Purpose of the JSS chassis is kind of like your own skeletal system – it serves as the scaffold of all other systems. The chassis of the JSS car can be made out of any material and the only constraint would be that the car be within 30 cm by 60 cm by 30 cm. Thus, cardboard, foamcore, plastic, cereal boxes, 2-liter bottles – your creativity dictates this material.
Below are some basic 3D designs that are actually the 4th, 5th, and 6th generation designs. Of course, you shouldn’t use them as they are. Though they aren’t copyrighted ideas, they’re not your ideas. BUT, you can learn from the dimensions and even alter the design using a 3D software like Google Sketchup so that the end solution is totally different from the original idea. Feel free to download the skp files and use in this manner. Be Creative!