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10-13-2013 02:56 PM  4 years agoPost 1
rcnut

rrElite Veteran

Rockford, Illinois

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I finished installing a ZTW Gecko Series 120A HV (High Voltage) Brushless ESC OPTO (No BEC) in my Whiplash Electric that I picked up at the Schaumberg iHobby Show. So it was time to test it out, not to mention the weather was perfect. I’m not sure if I have it setup right or if I’m having a problem with my motor. It seems to be surging at speed…and if I do a climb out, or anything requiring reducing the collective / unloading the head speed…the RPM drops about 100-200 RPMS, I’m guessing.

Also, I cannot throttle up in normal mode. It will start the spool up process and obtain !40% throttle, then spool down, then it will spool back up with a little more head speed, then back down.

However, if I start with throttle hold on and switch to idle 1 or 2 and release the throttle hold, it will spool up just fine. I thought there might have been a problem with the throttle calibration, so I recalibrated it a couple of times…no fix. I suppose it could be the motor timing, but I have that set to “auto” mode. The governor mode is set to mode 2. According to the instructions, this mode is for high kv motors (10p x 500kv x 44v = 220,000) . I’m using the Xera 4350 500KV 10P motor. So I’m a bit stumped!

I managed to get 3 flights on it…to also checkout the rest of the heli. The 716mm Rail blades are very noisy!

Maybe the auto mode for the motor timing is constantly serching for the optimal setting...this might explain the RPMs going up and down.

What do you guys think?

The ESC is at least 8" away from the motor

Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
...Citizen 654!

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10-13-2013 04:37 PM  4 years agoPost 2
jgalen0025

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royersford, pa- US

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if you are using 716mm and 105mm tails then you risk the heli cutting off the tail blades and self destructing in the air. The biggest blades that you can fly safely are 710mm. (as stated in the manual)

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10-14-2013 02:12 PM  4 years agoPost 3
rcnut

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Rockford, Illinois

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Oh...I didn't see that! Ok, I have others 710 and smaller.

Besides...the Rail blades are very noisy!

Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
...Citizen 654!

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