Surging motor
 

I have a electric powered flatout, similar to the Charger that I am trying to put together by fabricating parts from scrap Depron. It has a the following:

Motor: Rimfire 22M-1000 (kV Rating: 1000 RPM/V, Max. Constant Current: 11A, Max. Surge Current: 15A.

ESC: Apollo 12 BEC Speed Control.

Battery pack: Lightflite (and Thunder Power) 2S 480mah 15C LiPo.

When I was running the motor up earlier this evening, the motor was surging, going fast then slow then fast, and so on.

I am thinking that the battery pack was incapable of running this setup, but I am not sure. I have other battery packs, for instance, a pair of 3S 480mah 15C LiPo packs as well as some larger capacity packs.

Am I thinking correctly as to what was causing this surging?

CGr.

RE: Surging motor
 

esc
if you tried larger batterys (say a 1500 mah 15c)
get one w/ more amps
or
were you outside if so how cold (below freezeing?)
lipo dont like the cold

are you overproping the motor?
that will cause it to draw more amps so your esc wont be able to handle it

RE: Surging motor
 

Wattsup showed around 7.2 amps with a 12 amp ESC.

I think it was the battery, and that I exceeded the max current (15C) for those packs. They were intended for smaller aircraft, The Bug (www.lightflite.com) which weighs in a good 8 ounces than this plane does, although I have not yet flown this one yet. I was trying it out, measuring the max current with the lighter battery pack, looks like I'll have to go with the three cell 480 mah pack. (15C is 7.2 amps which may work out.. I'll see.. I may have to stretch that out to an 800 mah or so but don't like the added weight).

CGr.

RE: Surging motor
 

See the thread at http://www.rcuniverse.com/forum/m_8487409/tm.htm

RE: Surging motor
 

yep then the battery
hobbycity has some small 20c ones
http://www.hobbycity.com/hobbycity/s...2&v=&sortlist=
just be sure when you switch to 3 cells you dont fry your motor (prob will need a slightly smaller prop, depends on motor)

RE: Surging motor
 

Ok, thanks for the info. I have several 3 cells lying around that I can probably use... forgot what capacity they are, but they should work. The motor should be fine. Ultrafly Rimfire. It should run at about 8 amps or so as it is set up now, and the ESC/BEC is a 12 amp.

CGr.