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Tigermoth
08-18-2005, 08:38 PM
I have a beaver with 300 motor 2 cell lypo berg reviever and a (Max Product -Mx 9217 esc mp 7.2 volt bec.15 amp )
Problem motor quites running mid flight and hard to get going again .
Could the esc need programingif so how is it done for this esc as i can not find any info on it? or could it be receiver?

Steve
08-20-2005, 04:58 PM
What size prop are you using? Is this the stock GWS 300 or 350 motor?

Tigermoth
08-20-2005, 09:29 PM
Stock 300 with a Gws 10 x 80 prop

Dr Kiwi
08-20-2005, 10:31 PM
Stock 300 with a Gws 10 x 80 prop

What is the gear ratio? and what is the capacity of the 2s Lipo pack?

Plane_freak
09-01-2005, 05:37 AM
It has happened to me before. I think mine was caused by premature motor wear because I didn't break it in. This could be the cause for motor failure. Or the ESC overheating.

Unbalanced prop
09-01-2005, 01:40 PM
You could be hitting the LVC. I don't know much about that ESC. Do you know what the LVC is set at?

Doug

nova801428
09-01-2005, 11:31 PM
yah my brother plane freak likes to crash too much but it can be premature motor wear thats why you properly break in your motor

nova801428
09-02-2005, 12:06 AM
Ignore the last post he just thinks he can fly anything but check your esc make sure it isn't hot also check your connectors. I have a set of jst plugs that don't work well together.

hasbeen
11-03-2005, 03:56 AM
i have the same problem. slow fly completely stock, 6.6 to 1 gear, 1180 prop, pixie 20 speed controller and 1500 ma 2 cell lipo. cant' get the throttle past about 2/3rds throttle or the motor cuts off. the combo puts out about 35 to 38 watts, nothing gets hot. i have replaced everything in the power system and still have the problem.
anyone out there have any ideas?

Dr Kiwi
11-03-2005, 04:41 AM
i have the same problem. slow fly completely stock, 6.6 to 1 gear, 1180 prop, pixie 20 speed controller and 1500 ma 2 cell lipo. cant' get the throttle past about 2/3rds throttle or the motor cuts off. the combo puts out about 35 to 38 watts, nothing gets hot. i have replaced everything in the power system and still have the problem.
anyone out there have any ideas?

1500mAh pack and it can't cope with 5A-6A or so????? Are those older model Kokams? Just to humor us, check that your LVC is set on 6v, then try another 2s pack and see if the same thing occurs.

Cheers, Phil

qban_flyer
11-03-2005, 05:06 AM
You could be hitting the LVC. I don't know much about that ESC. Do you know what the LVC is set at?

Doug

My first thoughts exactly. It might be programmed for a higher cut off point than 6V.

qban_flyer
11-03-2005, 05:09 AM
i have the same problem. slow fly completely stock, 6.6 to 1 gear, 1180 prop, pixie 20 speed controller and 1500 ma 2 cell lipo. cant' get the throttle past about 2/3rds throttle or the motor cuts off. the combo puts out about 35 to 38 watts, nothing gets hot. i have replaced everything in the power system and still have the problem.
anyone out there have any ideas?

Been there, done that many times.

Reprogram the ESC from the get go. I know it is time consuming with C/C ESCs, but once you get the hang of it, it is not that bad and they are really good ESCs

qban_flyer
11-03-2005, 05:12 AM
Ignore the last post he just thinks he can fly anything but check your esc make sure it isn't hot also check your connectors. I have a set of jst plugs that don't work well together.

I have had all sort for problems with JST connectors. Anything over 5 amps will fry them. Have switched to DEANS Micros. They can withstand 12 amps continuous and up to 15 for 30 plus seconds before they begin to get warm.

flyranger
11-03-2005, 03:16 PM
I use e-flite 3.5mm bullet connectors for everything. I had a jst connector short out one wet morning causing a spectacular fire and loss of a 30 eight cell NIMH pack!

hasbeen
11-03-2005, 03:18 PM
i have wondered about the connectors, but they never seem to be warm.
the lipos are new electrifly and the cut off voltage has been reset to 6 volts, and it was a pain to reset, like someone mentioned.
i've ordered a 9.6 volt nimh pack to try. i had 2 1200ma electrifly lipo packs that i tried in the beginning of this adventure. i tried them individually and they paralleled for 2400mas. nothing has worked. i even tried reprogramming the throttle "travel" on the transmitter(jr). this is also the second esc and motor setup. i really think this thing is jinked. at this point maybe a new plane would be the best bet. :-)

hasbeen

qban_flyer
11-03-2005, 04:56 PM
I use e-flite 3.5mm bullet connectors for everything. I had a jst connector short out one wet morning causing a spectacular fire and loss of a 30 eight cell NIMH pack!

I had one, just one set (male and female) melt at less than 10 amps! That's all I needed to switch over to DEANS, both Micros as well as Ultras.

Steve
11-03-2005, 10:55 PM
Well, somewhere along the line your ESC is sensing that you can't deliver enough power. Normally, that would be the LVC is set incorrectly, or your prop is too big for the motor/battery combination. If you have a "tired" or damaged battery, it just wouldn't be able to deliver the juice necessary to go WOT. You might try propping down to a 1080 or even a 1047 and see if you have the same problem. If it goes away...that's your answer. If not, I think your idea of trying an 8cell NIMH is a good one.

I also agree with Qban's comments about connectors. JST's just won't cut it. Better to go with Dean's Ultra's or Sermos.

flypaper 2
11-04-2005, 02:59 PM
Sounds like a good candidate for a Wattmeter.

hasbeen
11-04-2005, 04:35 PM
i did replace the motor connectors with dean's ultras. the throttle travel did increase, almost to full but not quite. i haven't put my power meter on "this" setup but before it was pulling about 6.5 amps and maybe 38 watts. i have changed the props but nothing changed, the motor still cut off.
i'm thinking about resoldering all the connections i made. i don't how bad a cold joint would affect the preformance of the drive system but i'm sure it can't hurt. besides it way to windy to try to fly today. :-)

hasbeen