Tunnels, etc. are not the main problem, because you allways have some reflections of the infrared signal. Try it with your tv set ir controller
I can point anywhere in a small room with my ir transmitter, without any serious problems.
The ir system from
www.ttt-parts.org has four channels, that's true. But you can't drive two (or more) cars at the same time.
The only advantage is, that you don't have to switch of a car, if a second one is running on the trial modul. If you try to use two transmitters at the same time (even with different channels), they would interfere. That is because they all send on the same IR frequency (normally 38 KHz).
Unlike to the "normal" FM Systems, with different subbands (27.045 Mhz, 27.095 Mhz, etc .)
@akura2
Did you manage the steering? New pics? Maybe a new thread with your truck and your progress?
Nice tires! I hope you use them only for a mold. Because they are definatly to hard. You should use silicone or latex tires. They will improve the climbing abilities of your trucks.
diets - hill climbing without silicones? no way!