HOW TO PICK YOUR MATERIALS

Steel
  • Mild Steel 
  • Chromoly Steel 
    • Easy to work with 
    • Relatively inexpensive  ($4/foot)
    •  Light weight 
    • Can be easily changed/modified 
    • Readily accessible. Comes in a large variety of sizes and wall thicknesses 
Aluminum
  • Aluminum: Very stiff for its weight 
  • Harder to weld 
  • Needs more material to resist fatigue
  • Can be difficult to repair
Titanium 
  • Light 
  • Strong (but not stiff) 
  • Absorbs shock 
  • Hard to weld 
  • Expensive
  • Limited sizes
Brushless Electric Motors 
  • Very efficient 
  • More expensive 
  • Controller is more difficult to wire
Brushed Electric Motors 
  • Inexpensive  
  • Lower overall  efficiency 
  • Controller is inexpensive and easy to wire 
Batteries 
  • Choose carefully  
  • Batteries are one of the areas where you get what you pay for. 
  • Decisions to make: 
    • What voltage does your car run at? 
    • Higher voltage means lower current. 
    • How much weight can you carry? 
    • How much energy can you get at that weight?
    • Can your solar panels recharge the battery pack? 
    • Is it a road race or a track race?
  •  The 5 kilowatt kilowatt‐hour rule kw‐h = Amp‐hours x Voltage (at the 20 hour discharge rate) 
    • Example: Four 12 volt, 84 amp‐hour batteries batteries in series 84ah x 48 v = 4032 watt‐hours or 4.032  kilowatt‐hours
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