[NSRCA-discussion] Electric Motor Problem

[glmiller3 at suddenlink.net]

Ron,

That sounds like the problem that Chuck Hocholter was having with his dualsky controller.  It was solved with a new controller.  I've been running the dualsky witha Jeti 99 and haven't had that problem.  I have had "chatter on throttle up" from a long downline which seems to have been fixed by adding soft brake.  My theory is that the prop is overspeeding the timing of the ESC without the brake.   I've seen this with dualsky and axi motors and with jeti and CC ESC's.

G
Sent from my BlackBerry® wireless device

-----Original Message-----
From: Ron Van Putte <vanputte at cox.net>

Date: Tue, 3 Jun 2008 23:15:43 
To:Discussion List <nsrca-discussion at lists.nsrca.org>
Subject: [NSRCA-discussion] Electric Motor Problem


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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