[tc3_racer_001]

just lap them twice then change the battery, remember they have to stop for fuel every 5-6 minutes, each stop takes roughly 10-15 seconds or more. (im sure pros could be much faster) so they have to stop 6 times, so about 1 minute of stops total. if you make a 1 minute battery change (not too unrealistic) then im sure you could be in amongst the top. just design it with clips rather than velcro so you can just clip and unclip the pack as well as easy side access... taking off the body wastes too much time and not taking it off can also waste just as much.

a few things to think about.

:)