[NSRCA-discussion] Electric Motor Problem

[John Pavlick]

Ron,
 Are there different timing modes on that speed control? Play with that. OR, 
try changing the prop. It sounds like the motor isn't spinning fast enough 
to accomodate the "virtual commutation" created by the speed control. Just a 
hunch - I'm still flying glow. Interesting problem though. I've only seen 
that happen when the (electric) motor starts up, not when it's running at 
nearly full speed.

John Pavlick
http://www.idseng.com


----- Original Message ----- 
From: "Ron Van Putte" <vanputte at cox.net>
To: "Discussion List" <nsrca-discussion at lists.nsrca.org>
Sent: Wednesday, June 04, 2008 12:15 AM
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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