lsjpeng

If you have a Himax 6332-230 on your patternship, this may help.

I have more than 110 flights on my e-Focus II already. The Himax 6332-230 runs fine. As my previous post a while ago, the high current drew was the downside that can not compete with other brands. Since my plane is well trimmed, so I have time to tweek the ESC.

I'm using a Phoenix 110HV...... yes, it is a monster, I bought it two years ago. I had no idea how high the current will be at that time, so I got the biggest one.

I was using almost all the default settings. 10S Li-Po. Take-off weight 12.0lb.

Cutoff Voltage: Auto
Cutoff Type: Soft
Brake strength: disabled
Throttle Type: Airplane Auto
Brake delay: No
Direction: Forward
Brake Ramp: slow
PWM: 13kHz
Start power: mediun 59
Throttle response: Median 5
Current Limit: Normal
Motor Timing : Standard

After more than 40 flights of trimming and fine tuning the throttle management, I found APC 19x12WE, with 75% throttle ATV at high end matched my fly style very well. However, one AMA Master sequence in general used ~3700mAh, peak current was 75-79Amp. See attached EagleTree data, first three charts, dated 06/21/08.

Since I'm using 75% throttle ATV at high end, so I believe I have enough margin to use low advance angle (or Motor Timing for Castle Creation). I changed the advance angel from "Standard" to "low" last weekend, the results were impressive, one Master sequence usage dropped to ~3100mAh, peak current was 68-72 Amp, see attached EagleTree data, last three charts, dated 06/28/08 to 06/29/08. I didn't feel any power drops, so no change on the 75% throttle ATV.

The current is still sligtly higher than the other brands, but at least it did improved w/o lost power. So I will keep this setting for the rest of season.

Luke

woodie

Hey Luke, thanks for information on your experiment. I have not tried the 'low' setting on my Jeti's but may give it a try on the bench. Secondly, the PWM rate at 13 kHz is higher than the 8kHz I am running at. Wonder if that has an impact also. I know when my son Chris tried the higher PMW settings with his Hacker outrunner he got slightly more power but the motor ran much hotter. Can you drop your PWM rate also?

Don

lsjpeng

Don:

Phoenix 110HV has three PWM settings: 13, 26 and 52kHz, no user define.
Yes, the battery and motor temperatures dropped after I changed advance angle to "low". Look the EagleTree data "peak current" trends before and after (blue lines in charts), the peak current is almost constant after the advance angle change, I don't feel power drops in the course of flight.

Each brand of motor responses may be different. Kevin had hard time on his motor, he even got "dead stick" on his e-Focus seond flight, probably due to improper settings. I was not there, let him tells the story. Michael already converted his Focus Sport to electric. He had more than 50 flights and seems he enjoy the electric. Terry's Dualsky 12T got loose magnet as you know. Kevin will soon moves to electric, so we Tomcats gangs will soon become "Green Power".

Luke

patternflyer1

My Feedback: (11)

Good info Luke!!

See you and Don at the Nats!!


Chris

Alan W

I always thought this was a no-no and will cause excessive heating of the FETS