would you change?

[gary watson 1]

I am awaiting delivery of the max thrust j3 cub green [pnp version], on the specs it says it has a 700kv motor with a 45a esc that 45a esc seems a bit low would you change it? I am going with a 4s 3300mah lipo will this be okay.

[Garbo]

Gary the best thing you will ever buy is a power meter it thakes out all the guess work and give you all the info you need.

**LINK**

[Frank Skilbeck]

My 700kv motor with a 12 x 6 and 4s pulls under 35A, so it depends what size prop you have on it, I can't imagine flying a J3 cub round on full throttle.

I've got telemetry current sensors on a couple of my models and it's surprising how few amps are required for stooging around.

[gary watson 1]

Thanks for the replies,looks like buying a power meter Garbo,Frank looking at what you say the 45a esc should be alright.I am very new to electric flying and you hear a lot of horror stories about planes that come as pnp models and the motors and esc that come with them not being powerfull enough to do the job.

[Pete B]

I understand your concern, Gary. We hear of supplied, unknown brand ESC problems quite often! I feel that many ESC's can either control the motor speed adequately or supply the necessary volts to the Rx, but all too often, at the less expensive end of the price range, they cannot manage both.

I've settled on a principle that, on a budget or mid-priced ESC such as Hobbywing, 3S with 4 servos or fewer should be fine. More than 4 servos, or any 4S and upwards system, I always use a stand-alone BEC.

For the little extra work involved, and the relatively inexpensive cost of UBECs, I've found this to be a worthwhile insurance policy - I haven't lost any model to Rx power issues since I adopted this policy.

Pete