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Will the Spektrum 4 channel Transmitter, MLP6DSM, bind with the BNF Navy J-3 piper that Hobby King offers
There is no BNF Cub - it is PNP which means you will need your own receiver.
Howver, the MLP6DSM itself (the LP in the name = Low Power) would not be a good choice at all for anything like the Navy Cub, as it simply would not have enough range.