Which one is that?

I am debating how cool my planned setup will run....... was just reading a thread with a 8s Savage and how good it runs. Debating if i should've gone with more volts. the power of 5s should be plenty on a 2spd, but not sure on temps. Thinking it will run cold, but the motor is unsure. The plane esc i want is rated at 100A, but up to 12s. Which means, that if something was to go wrong, just buy another battery and run 6-10s Neu/medusa or even Kb45.

I was shopping for parts for my transmission... couldn't find a steel 2nd gear. I opened it up. found 3 gears in the center, one medium, one small, and the center one was the largest. then some gears on top, and bottom. seems pretty complicated, but not sure how i could get my hands on a metal one. I like the idea of a single speed, but from the way i see it, a 2speed will run cooler, and have better performance.