<html>
<head>
<style><!--
.hmmessage P
{
margin:0px;
padding:0px
}
body.hmmessage
{
font-size: 10pt;
font-family:Tahoma
}
--></style></head>
<body class='hmmessage'><div dir='ltr'>
<DIV dir=ltr><FONT size=4><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 14pt"><FONT face=Arial>
<P style="MARGIN: 0cm 0cm 10pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-US" lang=EN-US><FONT size=3><FONT face=Calibri>I had a strange problem today with a Hacker C50-14XL comp/Castle 80HV Ice 2 combo.<SPAN style="mso-spacerun: yes"> </SPAN>Sounded like the motor/ESC was backfiring, so I stopped flying.<SPAN style="mso-spacerun: yes"> </SPAN>I had 56 flights before today, and this is the first time I noticed the backfiring.<SPAN style="mso-spacerun: yes"> </SPAN>I was at a contest last weekend, so if it had occurred there, I think people, including me, would have noticed.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></FONT></FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 10pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-US" lang=EN-US><FONT size=3><FONT face=Calibri>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.<SPAN style="mso-spacerun: yes"> </SPAN>I downloaded the data logger, but I really didn’t check it too closely.<SPAN style="mso-spacerun: yes"> </SPAN>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.<SPAN style="mso-spacerun: yes"> </SPAN>I also noted a comment that if you run out of data logging space, that could cause a “ticking”.<SPAN style="mso-spacerun: yes"> </SPAN>I did not have a ticking, but I decided to clear all stored logging information and set the sampling rate to "disabled".<SPAN style="mso-spacerun: yes"> </SPAN>I ran the motor/ESC for about a minute on the ground with no evidence of a backfire.<SPAN style="mso-spacerun: yes"> </SPAN>Could the data logging/storage space been it?<SPAN style="mso-spacerun: yes"> </SPAN>Has anyone else had a similar experience?<SPAN style="mso-spacerun: yes"> </SPAN>FYI, here is my program:</FONT></FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 10pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-US" lang=EN-US><FONT size=3><FONT face=Calibri><o:p></o:p></FONT></FONT></SPAN> </P>
<P style="MARGIN: 0cm 0cm 10pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-US" lang=EN-US><FONT size=3><FONT face=Calibri>Brake Strength: 30% <o:p></o:p></FONT></FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 10pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-US" lang=EN-US><FONT size=3><FONT face=Calibri>Brake Delay: No delay <o:p></o:p></FONT></FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 10pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-US" lang=EN-US><FONT size=3><FONT face=Calibri>Brake Ramp: Medium <o:p></o:p></FONT></FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 10pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-US" lang=EN-US><FONT size=3><FONT face=Calibri>Cutoff Voltage: 3.2<o:p></o:p></FONT></FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 10pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-US" lang=EN-US><FONT size=3><FONT face=Calibri>Current Limiting: Normal <o:p></o:p></FONT></FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 10pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-US" lang=EN-US><FONT size=3><FONT face=Calibri>Cutoff Type: Soft Cutoff <o:p></o:p></FONT></FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 10pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-US" lang=EN-US><FONT size=3><FONT face=Calibri>Motor Start Power: low (39)<o:p></o:p></FONT></FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 10pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-US" lang=EN-US><FONT size=3><FONT face=Calibri>Motor Timing: Custom (3) <o:p></o:p></FONT></FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 10pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-US" lang=EN-US><FONT size=3><FONT face=Calibri>PWM Rate: 8khz <o:p></o:p></FONT></FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 10pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-US" lang=EN-US><FONT size=3><FONT face=Calibri></FONT></FONT></SPAN> </P>
<P style="MARGIN: 0cm 0cm 10pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-US" lang=EN-US><FONT size=3><FONT face=Calibri>Regards,<o:p></o:p></FONT></FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 10pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-US" lang=EN-US><FONT size=3><FONT face=Calibri>Mike Cohen<o:p></o:p></FONT></FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 10pt" class=MsoNormal><SPAN style="mso-ansi-language: EN-US" lang=EN-US><o:p><FONT size=3 face=Calibri> </FONT></o:p></SPAN></P></FONT> <BR></SPAN></FONT></FONT></DIV> </div></body>
</html>