Heli speedo's dont have reverse, and aircraft receivers operate on bands that you could not legally run on a surface vehicle. If your local track does not allow reverse, then you could use the speedo, I have some that handle 300 motors and are smaller than a Spy or Xray speedo, they also handle 7.2 & 8.4v batteries for my Heli's. Aircraft receivers are teeny tiny and use micro crystals, half the size of an Novak XXL, they would be perfect for a Pro-Z or a modded electronics Mini-Z.
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