First Post: ESC/Motor/Battery question ¯\_(ツ)_/¯

[Jakers]

Hey guys,

I have been a lurker on this forum for a short period and have learned quite a bit. That being said, I still have a lot to learn and wanted to run my ESC/Motor/Battery combo by you all.

I scratch built a plane recently that is similar to the simple storch in design. I am running the following ESC/Motor/Battery:

Motor: http://www.altitudehobbies.com/suppo-motors/suppo-2217-7-1250kv-brushless-motor-park-425-equiv

ESC: http://www.altitudehobbies.com/brushless-esc-bec/suppo-brushless-escs/suppo-30a-brushless-esc

Battery: http://www.hobbyking.com/hobbyking/store/__8851__ZIPPY_Flightmax_3000mAh_3S1P_20C.html

The other day while finishing up my electronics and testing everything I noticed when running the engine for about a 30 second burst it got quite hot. I am wondering if I did something wrong when I paired ESC/Motor/Battery? Or is the engine getting hot normal?


Last mini question or more or less a sanity check. I have the following charger: http://www.amazon.com/Tenergy-TB6-B-Balancing-Charger-Battery/dp/B00466L0BW

I was a bit scared to charge my lipo in fear I would ruin the battery or worst case cause a fire. I bought a battery bag and made sure to charge it while the battery was secure in the bag. I set the volts to 11.1, 3000mah and charged the battery at 3.0 amps. Is this correct?

Thanks guys. Please let me know if I missed anything or you need me to clarify.

 

[Craftydan]

Hey Jakers,

Welcome to the Forum and out of the shadows

You're missing the critical piece of info . . . your Prop.

Without knowing it's size, there's no way to estimate if your motor is overloaded or not.

In general, Warm is ok, but Hot is not. YMMV, since your definition of warm/hot can be quite different from others, and there are exceptions.

As for your charger, you are correct -- 3A is the 1C charge rate for a 3S 3000 mAh pack, and should be pretty safe. Your caution is commendable (and justified).

 

[Jakers]

Craftydan, thanks for the reply. Slow Fly Electric Prop 9047R. So 9inch with a 4.7 pitch.

 

[Craftydan]

Took a look at the prop data for that motor over at:

http://www.flybrushless.com/motor/view/236

The 9x5" (not *That* much steeper that the 9x4.7") was pulling 19A on a low 3S pack . . . a 9" prop is a bit much for that motor on 3S . . . not that that has stopped me from using it on similar motors before . . .

You should have plenty of power with that motor for the Storch to cruise at a comfortable throttle, and WOT will probably climb like crazy -- on a 30 second WOT motor run, I'd expect it to be tiny in the sky.

Switching down to an 8x4.5 would be a safer bet, but if you can maintain discipline on the throttle, the 9x4.7 will do fine.

 

[Jakers]

Craftydan, great and this is exactly what I needed. I am used to flying nitro rc planes so I will have to get used the throttle for electric engines.

 

[ViperTech]

Welcome Jakers!
I was going to ask you about the prop, but the Crafty one beat me to it! He's quick on the draw! and Exactly correct!
Welcome again and ask any questions lots of help here.