[NSRCA-discussion] JR DSM glitch - trouble-shooting.

[colin chariandy]

I noticed that when I powered down and up the Rx the throttle servo moves to a near mid point position and immediately returns to wherever the throttle is set. It (9303) always did that. So I think the Rx lost power and on it's return the throttle servo did it's usual thing and rev'd the engine. It also didnt respond from idle so maybe it is stalling.
 
I'll replace the servo and battery. I also noticed that the heat shrink on the regulator was discoloured and torn so I think I'll replace it as well.
 
Colin.

--- On Sun, 4/26/09, James Oddino <joddino at socal.rr.com> wrote:


From: James Oddino <joddino at socal.rr.com>
Subject: Re: [NSRCA-discussion] JR DSM glitch - trouble-shooting.
To: cchariandy at yahoo.ca, "General discussion" <nsrca-discussion at lists.nsrca.org>
Received: Sunday, April 26, 2009, 4:00 PM


I don't believe a bad battery could cause the engine to rev up unless your battery failsafe isn't set properly.  Make sure it is.  


The first thing I would look at is the possibility that the throttle servo is stalled at low speed.  That could be pulling the battery/voltage regulator voltage down and it could recover after you started to throttle up and removed the heavy load.  


Finally I would run a one amp discharge test on the battery after it is fully charged to see if the battery is near its original capacity.  The best way to do this is to plot the voltage vs. time taking readings every 5 to 10 minutes.


Hope this helps.  Let us know what you find.


Jim





On Apr 25, 2009, at 4:30 PM, cchariandy at yahoo.ca wrote:







I had a close call today with my R921 Rx in an Integral.
 
I noticed on taxi out that the engine rev'd up and quickly back down without any command. At first I thought I must have bumped the stick by accident. Then just before take-off there was no responce from the throttle for a second or two then it was back. I thought the 170 may have loaded up a little and didnt respond. It did that one more time before I aborted the flight. However, I could'nt reproduce the problem in the pits.
 
Before powering down, I checked for holds or fades on the data logger - nil.
 
Battery voltage droped from 8.2V to 7.8V and 7.6 under 1A load. When I re-charged it took 350mA and I was only on for 3-4 mins.
 
Now...I did accidentally run the battery down to like 5V during winter but it did eventually recharge.
 
I'm using a Jaccio perfect switch/6V regulator, Jaccio 2000mAHr (1 season
 


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