[NSRCA-discussion] Hacker C50-14XL comp/Castle 80HV Ice 2 combo "backfiring"

[Verne Koester]

I was there when it happened and it definitely wasn't a normal sound. I
thought something had broken inside the fuse. Mike landed immediately and we
checked everything and all seemed okay including a run-up on the ground so
he went up again and the sound happened again but later in the flight (the
first time it happened immediately after he broke ground). I'm very familiar
with the plane since it used to be mine. I had the same motor but a
different controller. Another pilot there said it sounded like an "electric
backfire". I've never heard one before, but it sounded pretty scary.

 

Verne Koester

 

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Dave Harmon
Sent: Sunday, August 19, 2012 5:54 PM
To: 'General pattern discussion'
Subject: Re: [NSRCA-discussion] Hacker C50-14XL comp/Castle 80HV Ice 2 combo
"backfiring"

 

Hi Mike..

I have noticed a sound like a 'knock' on the side of the fuselage on 3
different airplanes, Plett 30-10 and Advance and three ESC.a CC 80HV ICE and
2 CC 80HV ICE V2.

I've looked at logs and don't recognize any problems.

I have always wondered what the sound was.at first I thought it might have
caused by the cables to the rudder and elevator slapping the side if the
fuse but they are fastened down tightly.

Then.I thought it might be caused by the wheels rattling..

It seems to happen most of the time on an up line.

It doesn't seem to be a problem.yet.but I would like to know what is causing
it.

 

Dave Harmon

NSRCA 586

K6XYZ[at]sbcglobal[dot]net

Sperry, Ok.

 

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Michael Cohen
Sent: Sunday, August 19, 2012 3:48 PM
To: NSRCA
Subject: [NSRCA-discussion] Hacker C50-14XL comp/Castle 80HV Ice 2 combo
"backfiring"

 

I had a strange problem today with a Hacker C50-14XL comp/Castle 80HV Ice 2
combo.  Sounded like the motor/ESC was backfiring, so I stopped flying.  I
had 56 flights before today, and this is the first time I noticed the
backfiring.  I was at a contest last weekend, so if it had occurred there, I
think people, including me, would have noticed.

Well, upon taking it home and hooking it up to the computer, I did find that
all my settings were still where they were supposed to be, so there was no
unexplained change there.  I downloaded the data logger, but I really didn't
check it too closely.  I then went online to look for backfiring problems
and the only thing I found was a sample rate of 10hz (mine was at 1hz) could
cause a backfire.  I also noted a comment that if you run out of data
logging space, that could cause a "ticking".  I did not have a ticking, but
I decided to clear all stored logging information and set the sampling rate
to "disabled".  I ran the motor/ESC for about a minute on the ground with no
evidence of a backfire.  Could the data logging/storage space been it?  Has
anyone else had a similar experience?  FYI, here is my program:

 

Brake Strength: 30% 

Brake Delay: No delay 

Brake Ramp: Medium 

Cutoff Voltage: 3.2

Current Limiting: Normal 

Cutoff Type: Soft Cutoff 

Motor Start Power: low (39)

Motor Timing: Custom (3) 

PWM Rate: 8khz 

 

Regards,

Mike Cohen

 

 

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