Diagnosing a demaged motor?

[BHChieftain]

Hi,
Here's my situation-- I have a tenshock mono1 with a tenshock ESC and motor (28"" diameter motor), and I am getting really low speeds (maybe 25mhp) on 3S, and overheating in just a few minutes. I've checked all of the esc settings, driveline, etc.

I think I either have a problem with the ESC or the motor. Is there a way to test for a demagged motor short of replacing it? I have an extra proboat ESC, but I don't have an extra motor that will fit in this boat.

Right now I have the boat stripped as I'm painting it, so it would be great if there was a way to bench test it outside of the hull (I'd like to figure out if I have a motor problem before I order another motor...).

Any bench testing tips? If I swapped out the tenshock ESC and ran the motor on the bench with a proboat ESC, what behavior would I be looking for?

Note, when I run the existing motor/ESC on the bench (no shaft attached), it sounds fine, but gets hot *real* fast... like 30 seconds.

Chief

[m4a1usr]

There are a couple KV checkers available for bench testing a motor. Thats probably the most reliable method and accurate. Hobby King has one that I purchased and its been spot on. About $35 and worth every penny. OSE tips section has a bench method you could try and if I remember right Hobby Lobby has a very nice bench tester for $70. A bit more deluxe then the one from HK but I have not heard any reviews so I'm still not sure to its quality. Theres the 'ole spin the motor up in a drill press and crunch the numbers method (thats sort of the recomendation used in the OSE suggested method). But there are some options available to determine if the magnets have become de-mag'd.

John

[BHChieftain]

Hi John,
Thanks for the info. The tip on using a drill with a known rpm is very clever!

Chief