[NSRCA-discussion] Electric Motor Problem

[Charles Hochhalter]

IT is definitely your timing and switching that is causing the chatter. 
   
  Now i definitely recommend going to the 19X12 prop.  This is the identical setup i used on the Pentathlon weighing 10.2 lbs RTF.  I tried using a cut down 18X15 and performance was staggering until I let the magic smoke out of the motor!!!!!   Lasted about 4 flights.
   
  Good luck
   
  Chuck

Ron Van Putte <vanputte at cox.net> wrote:
  Sorry, I made a mistake. I've been involved with selling several 
Dualsky 6360-12T motors recently and, when I was typing what I am 
using on my airplane, I got the turns wrong. I am using a Dualsky 
6350-16T, not the 12T. I know the 16T can swing a bigger prop than 
the 12T. Does that change any of the responses I received?

BTW, thanks for the help so far.

Ron VP

On Jun 4, 2008, at 9:20 AM, Charles Hochhalter wrote:

> Your soution to the problem will be timing... i switched to the 
> Castle 85 and reset timing solving the problem.
>
> As for your prop selection and the 18X12, this is one of the worst 
> props for eating amps that is out there. I recommend a smaller 
> diameter prop. I ran the 16T on a 19X12 and liked the performance.
>
> When I flew the 12T I had trouble developing the power I would be 
> happy with on a 10 lb airframe.
>
> good luck
>
> Chuck
>
> Terrence Walker wrote:
> Ron,
>
> I've only been flying electric for only two months so be sceptical 
> of anything that I have to say. I have a setup very similar to 
> yours and I had that same problem.
>
> Here's my setup:
> Dualsky 6360 - 11T
> Jeti Opto 90 Advance Plus ESC
> APC 19X13 E
>
> My solution was to set my ESC to "hard timing" to eliminate the 
> chattering.
>
> I'm not familar with the programming card so "OUTRUNNER timing" may 
> be the same as
> "hard timing" in which case in those immortal words of Gilda 
> Radner..."never mind"
>
> Hopefully, someone more knowledgable than me post a solution.
>
> Good Luck,
>
> Terry
>
> Ron Van Putte wrote:
> I have converted a World Models Spot-On 120 for electric-power. The
> motor is a Dualsky 6350 - 12T (2000 watt), swinging an APC 18x12 E
> prop. The speed control is a Jeti Opto 90 Advance. Using the Jeti
> programming card, I set the timing for OUTRUNNER, the brake for OFF,
> the cutoff voltage to HIGH, the cutoff type to SLOW DOWN and the
> throttle curve to LINEAR. I am using a Futaba 9Z transmitter, with
> the throttle throw initially set from -100% to +100% as indicated in
> the Jeti instructions.
>
> When the throttle is advanced, RPM builds up normally, but at about
> 60% of throttle stick position, the motor 'chatters' and I have to
> shut it down. If I don't do anything other than reduce the high
> throttle in ATR from +100% to +80%, the motor comes smoothly up to
> maximum RPM.
>
> What's going on?
>
> Ron VP
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