Went flying today. First flight with a new prop and it took off like a rat racer, about 4.2 sec on 65' lines. Motor was hot when it came down. Let it cool, adjusted the computer thing and went again. Took off normal clocked at 5 sec then started slowing down. Got slower and slower until gravity and drag wins and did 1/2 lap on the grass until it stopped rolling then a few more sec the motor stopped turning. I thought the motor was locking up but it was cool. Put in a new battery and everything was ok again.

Was the battery too low? I guess a Hubin timer/Ice edge 50 doesn't have a low voltage cut off? I measured 14.5 volts (4 cell) so, seems like it should have been enough. Maybe the battery's going bad?

Took the motor apart and the bearings feel ok. I put in some grease and put it back together. Will try again tomorrow.

MM

P.S. How fast do you fly your Sig Banshee?

Oh yes, the Castle Creations Edge 50 does have a low voltage cut off and it sounds like you hit it with it set for soft cut off! Check your ESC on a computer and see what the settings are. 

The adjustment was for lower RPM of course. Was a very soft cut off, if that's what it was, took about 10 laps from slow down to stop. I was waiting for the plane to burst into flames.

MM

I had it programed for two 2-1/2 minute flights. I didn't stop to think the fast fight used more than half the battery.

MM

Went flying today. Took three 1 minute trim flights slowing the rpm down each time. First 2 flights motor quit normal with warning sag. On the 3rd flight I finally got the speed I wanted, did a couple of loops then leveled off for a couple of laps then the motor just quit with no warning and gave me beep beep beep............beep beep beep............beep beep beep. What does that mean? Checked the voltage and it was 15.2 slightly below storage voltage and the 4 cells were all even. Did I fry something on that one super fast flight the other day?

MM

Beep,Beep, Beep is explained in the ESC instructions.  I suggest you review them.

Sounds like you shouldn't be drawing too many amps, maybe you have something going on with the wiring causing a problem?
But you said the last flight went faster, so I guess you made an adjustment to the rpm with the timer? Either that or you changed up the props to a higher pitch?
At any rate, I would take advantage of the CC ESC capabilities and try to get the read from the flights in question.
OR go old school and hook up a what meter and see what amps you are drawing. But the ESC read during flight is way better, since it give you what was happening in the air, not on the ground.
In theory, if you only got 3 minutes of run time and you depleted the battery, you are drawing more amps than normal. Just using basic math, 25A draw should get you about 6 minutes run if you drained the battery completely. I can't imagine you drawing the 45A or so that the 3 minutes would indicate. If so, you have a problem, I would think...

You might want to see if your timing settings and such programed to the ESC are the same as what other folks without trouble are running. I'd look closely at all the wiring and your solder joints also.

I hope you get it sorted!
R,
Chris

Set the cut off to 3.2v factory default. Looked at the data logging briefly, don't know how I can use it but it looks cool. Windy and rainy today no joy.

MM

Did some more flying today. The first 2 flights the motor ran about half the time out then dropped down to about 500 rpm for 10 sec with no warning then cut off. This was with a MAS 11-6e at 8682 and 8574 rpm for a lap time of 5.12 and 5.28. battery was fine as I was taking 1:15 flights to check airspeed.

Next flights were with an APC 11-5.5 and after several normal fights and shut downs I was at 10,320 rpm and 5.12 lap time.

It seems that higher pitched under cambered MAS is a much bigger load and is causing my ESC problems.


MM