Finding inconsistencies between the video and plan recommendations for some planes. The Tiny Trainer plans say 500-1000 mAH 3s while the video (1:16:30) says 500 mAH 2s. Guessing either will work but for newbies, it's a bit confusing. Hate to burn something up with a stupid mistake, which I'm more likely to do as a newbie. I finally have everything I need to build the trainer and a few other planes. I'd laugh if I smacked into my house and wrecked stuff, but I'd cry if I smoked it doing something stupid with electronics.
I went with a 500mah 2s and a 2300kv motor with a 6x4 prop. That set up has been good for me.
As long as your ESC is a 2-3s and big enough to take the motor load with a 20% head room on top, you won’t damage the electronics. I would stay small, I found it harder to fly with a heavier pack. 6 mins feels long enough when you need all your concentration to fly.
The difference in batteries-
2s is lighter, it spins the prop slower, so the plane hasn’t got as much top speed (good for learning) but if you have a lower KV motor and your build was heavy then it may be more sluggish.
3s is faster, pack is heavier due to the extra cell. If you are heavier on the throttle stuff happens fast! If you have a lower KV motor then it might be better to start with a 3s and set the throttle so you can’t get full power.
I learned that this build wants to be as light as possible, especially at the front.