joeflyer
Flying officer
"It's a great day to fly!"
Posts: 33
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Post by joeflyer on Aug 10, 2007 8:45:48 GMT 1
Besides my SC, I also own a Blade CP Pro. I crashed it again the other morning (it's ok, I'm getting used to crashing my Blade) and since it'll be out of commission for a little while I thought I'd try using its Li-Po in my SC. It fits in the battery compartment without any modifications -- it's a little tight, but the velcro holds it down and the door closes fine. A few weeks earlier I bought a parkzone DC Peak Charger 1.8 (Model #PKZ1519) and it came with a short adapter wire with the standard SC plug on one end and a smaller two pronged male plug on the other end. I'm sure there's a more technical term for these types of connections, but I'm not sure what those are ;D The parkzone charger has been great though...I highly recommend it. Anyway, this adapter wire fits perfectly to the connector on the Blade's Li-Po, so...all that was left to do was to remove the jumper on the ESC and we were off. Wow, that was a noticable change! When I got the new charger I had also picked up the optional 8 cell NIMH...and thought that was great. But, I was able to hold some brief hovers with the liteness to power ratio of the Li-Po. It performed more loops and seemed to have a more consistent power throughout the flight. I did notice...can't remember if other posts mentioned this or not...that I couldn't slide the throttle all the way up or the engine would cut off and I'd have to zero out the throttle to start her up again. Other than the throttle issue, I'll probably be using the Li-Po more often now...it was fun  |
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Post by duck9191 on Aug 10, 2007 14:45:10 GMT 1
more then likely the battery cant supply enough amperage to the esc and the esc cuts.
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hack73
Squadron leader
Posts: 154
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Post by hack73 on Aug 10, 2007 14:51:18 GMT 1
If you are getting motor shut down at full throttle than it sounds like you are at the Low Voltage Cutoff (LVC) for the LiPo. I just tried my new 11.1v 3c 1500mAh battery and love it! I was running a full throttle and it cut off. I recycled the throttle to 50% and was able to bring it down safely. Do I have to rebalance my cub now since it wants to go vertical at full throttle? Here is my battery: www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXNYK4I thought it would fit into the battery box without modding it but it doesn't. Found out when I was already in the field. Just a little too long. My first outting I had to put in on top of the receiver which I think made it unbalanced. |
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joeflyer
Flying officer
"It's a great day to fly!"
Posts: 33
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Post by joeflyer on Aug 10, 2007 19:01:07 GMT 1
OK, maybe I spoke too soon on how great this experiment was  Now, my SC's engine will not throttle up with either the Li-Po or with the NIMH  Here's the chain of events: I removed the jumper on the Rx, I installed and flew with the Li-Po, During flight I noticed the throttle issue and kept the throttle under that threshold for the remainder of the flight, During normal flight the engine cutout...signaling low voltage...so I brought it in for a landing, while landing I reset the throttle for an extra burst of juice to get to my landing strip (and that worked fine), After coming to a stop I gave the throttle a 1/2 second burst to make sure everything still worked (and it did), I then put the jumper back on the Rx, Connected a fully charge 8 cell nimh, Went to hand launch it, and...when I gave it full throttle the engine raced for a second or less and then stopped, and now...neither the Li-Po nor the NIMH can make the engine throttle up. What does work: With either battery installed the rudder, elevators, and the stupid kill switch/xport button (I'm still confused why this button shuts down the planes systems???). I've also connected both batteries directly to the motor and it spins mad-crazy...so the motor works. So, did I fry my speed control or something...and now I gotta get a whole new Rx??? Is this a reparable fix? Any help would be appreciated. I used the Li-Po from my Blade because it broke in a crash...and now I've trashed my SC... So sad   |
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Post by SCC on Aug 10, 2007 19:40:29 GMT 1
joeflyer
What i would do is cut the Tamiya connector off the esc/rx and your stock batt. For a quick test i would connect the wires together making sure not to short anything and see what happens.
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joeflyer
Flying officer
"It's a great day to fly!"
Posts: 33
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Post by joeflyer on Aug 10, 2007 20:44:40 GMT 1
Thanks for the suggestion, but I'm not sure I follow? Are you thinking the connector is the problem...and that I should cut the battery connectors out and just twist the wires together??
Because I know the connectors work, and that juice is getting to the Rx, because all of the controls except the throttle are working.
So, please explain further...
Thanks!
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Post by SCC on Aug 10, 2007 21:11:12 GMT 1
Thanks for the suggestion, but I'm not sure I follow? Are you thinking the connector is the problem...and that I should cut the battery connectors out and just twist the wires together?? Because I know the connectors work, and that juice is getting to the Rx, because all of the controls except the throttle are working. So, please explain further... Thanks! Tamiya connectors are bad they can cause all sorts of problems. My motor would tick over without any throttle control, then when i used the slider i would get nothing. I then wiggled the connection and the motor started and the throttle was off I just think its a worthwhile exercise, rather than replacing electronics at this stage. |
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joeflyer
Flying officer
"It's a great day to fly!"
Posts: 33
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Post by joeflyer on Aug 10, 2007 21:27:06 GMT 1
OK...fair enough. Are there other connectors, that you're now using in place of the error-prone Tamiya ones, that I should just upgrade to?
Thanks!
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Post by SCC on Aug 10, 2007 21:54:51 GMT 1
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Post by l8again on Aug 10, 2007 23:00:22 GMT 1
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Post by duck9191 on Aug 11, 2007 1:13:16 GMT 1
deans are a much better connector, they stay together alot better, are simpler to use, and can handle alot of current, so if you ever get another plane you wont need to change your connectors again.
do your brushes arc as the motor is running, you will normally see blue flashes if inside the motor if they are. if so your motor maybe shot. this could cause the motor to draw alot more current then it should and could kick the esc out.
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joeflyer
Flying officer
"It's a great day to fly!"
Posts: 33
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Post by joeflyer on Aug 11, 2007 2:53:13 GMT 1
if so your motor maybe shot. Geesh, I hope not...I just replaced the motor  I'll try the different connectors, and hopefully that fixes it. Thanks! |
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Post by SCC on Aug 11, 2007 7:57:54 GMT 1
Joe. Have you checked the small capacitors on the motor are still connected? I dont know what these things do, maybe someone can enlighten me  Out of interest, why did you change motors? |
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joeflyer
Flying officer
"It's a great day to fly!"
Posts: 33
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Post by joeflyer on Aug 11, 2007 10:18:58 GMT 1
Well, the motor still works...because I connected the batteries to it directly, for like 1/2 a sec and it turns over with plenty of Umph. But, I'll give it a once over I bought a new stock 480 motor because I was having low power issues, where I could barely take off...and if I did get it in the air, I couldn't sustain flight for very long. I even pulled off the landing gear on one attempt to make it lighter. I didn't think it was my batteries...because they seemed to holding a charge according to my non-electrical engineering knowledge  . Long story short, the new engine didn't fix my power issues. I took the batteries into a Batteries Plus store and they said they were shot...So, I bought the optional 8 cell nimh -- that's been a great battery btw. When I bought my SC from www.redrockethobbies.com/?Click=15368 it came with a free extra 7 cell nimh (which it still does for those looking to buy their 1st SC or one as a gift). I got my SC last September and logged an average of three flights a week through December. And when it got rainy and windy through the end of winter and the beginnings of spring I still tried to fly it at least once or twice a week. I think I just wore out the batteries ;D I've also been told that the wall charger it comes with isn't the best charger to use...and I used it exclusively all that time. I've got that new parkzone peak charger now...and I no longer use the wall charger, and maybe I'll get more life out of the 8 cell this time I'll be sure to post whatever the fix is for this problem as soon as I can figure it out. Thanks! |
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surjer
Squadron leader
Posts: 168
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Post by surjer on Aug 11, 2007 13:24:45 GMT 1
Joe. Have you checked the small capacitors on the motor are still connected? I dont know what these things do, maybe someone can enlighten me Out of interest, why did you change motors? The capacitors on (2) that are connected to the motor are there to reduce RF noise. The motor causes alot of RF interference so we use the capacitors to keep that from happening. Basically, withought them on there you run the risk of loosing control of your plane due to the motor enterfering with your receiver.. |
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