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Old 02-21-2016, 07:00 PM
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Batt Share caused crash

Hello SmartFly.

A couple of days ago, my Topflite Giant scale P-47 crashed. Wasn't pilot error, I've put almost 200 flights on this plane, but it was the smart fly batt share system that caused the incident. I have the smart fly batt share system hooked up to two life 6.6v 2200 mAh batteries. I've had this system in my plane since I put it together and it has never caused me any troubles. A few days ago, I was at the field for the first flight of the year, and coming in on final approach, all of a sudden I lost all control. All my batteries were fully charged, but as I was walking over to the crash site I noticed the plane was smoking inside the fuselage. Looking closely, I noticed that some how the batt share system itself had blown up and caught fire. Also looking around, I noticed that all the wires connecting from the system to the batteries were melted, and the female leads from the batt share system to the male leads from the batteries were melted together and I can't even separate them apart. I'd like to know why or what caused this incident, and if smart fly would be able to compensate the damage by sending a new batt share system at the least. I'm not bashing smart fly, but I'm a bit skeptical because it is very unusual that this kind of thing would happen.
Thank you,
Trevor Jones.
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Old 02-21-2016, 07:09 PM
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The inside of that plane looks like a bowl of spaghetti. And the antenna wires are nice too.
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Old 02-21-2016, 07:18 PM
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Sometimes we try to eliminate trouble by adding more safe guards to the plane.But every time we add it, just makes for more chances of something going wrong.Being electrical, and not for sure what caused things to go wrong I don't think Smart Fly will help you out. But you never know till you ask.
Sh!! happens you just got to get past it.
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Old 02-21-2016, 07:22 PM
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Will you post a picture of the smart fly. Do you have manual switches or pin& flag?????
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Old 02-21-2016, 07:24 PM
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Quote:
Originally Posted by krxprt View Post
The inside of that plane looks like a bowl of spaghetti. And the antenna wires are nice too.
I agree.... loose wires just hanging and wrapped around the light ply... that is a chaffed wire short just waiting to happen.
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Old 02-21-2016, 07:37 PM
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Based on the pictures I am not sure it was the Batshare either. Burned wires on both sides would lead me to believe there was a short downstream of it or a high demand. The Batshare is only rated to 3 amps per input and the could easily be exceeded in a crash.


Mike
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Old 02-21-2016, 07:53 PM
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Is it possible that the insulation on the battery to Battshare had developed some wear over time and caused a direct short?

I'm just trying to help, and I do Grant that the Battshare could have malfunctioned. However I consider the amount of airtime in the equation and I find it easier to conclude that you fell victim to direct short.

I also see wires (spaghetti as previously mentioned) not tied down and sharp edges all over.

I hate losing a plane to electrical, I've been there. I hope you get it figured out for sure. I'm sure they can test the battshare at smartly if you send it in.
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Old 02-21-2016, 08:06 PM
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After a crash, servos in a bind can overload everything causing melted wires from the servo to the battery. Makes it difficult to pinpoint the cause. Locking out can be from poor receiver/antenna location or just bad luck. Again, it's tough to pinpoint the root cause. Sorry for your bad luck. We can all empathize.
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Old 02-21-2016, 08:18 PM
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Something could have shorted after the crash, impossible to tell what happened.
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Old 02-21-2016, 08:20 PM
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Yes the batts hare could have shorted too, are they fail safe, I have never used one.
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Old 02-21-2016, 09:18 PM
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Thanks for the input guys. What would cause a short to happen? I'm not all tech savvy like most of you guys are when it comes to batteries and electrical.
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Old 02-21-2016, 09:19 PM
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sorry about your crash, but there is no evidence that it was caused by the battery share. I see a lot of wire, and after 200 flights, they can get chafed if they are bouncing around or held too tight by zip ties. could be that or a hundred other things.
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Old 02-21-2016, 10:27 PM
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Could also be the batt share, I don't think you can judge anything from a few not so great pictures.
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Old 02-22-2016, 12:01 AM
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A short circuit can only exist from the point of the short to the power source
A locked servo would also have melted wires since life batteries are capable of high discharge rates
A clear photo of all components that show heat damage would be great
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Old 02-22-2016, 08:48 AM
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Quote:
Originally Posted by boothg-3 View Post
A short circuit can only exist from the point of the short to the power source
A locked servo would also have melted wires since life batteries are capable of high discharge rates
A clear photo of all components that show heat damage would be great
agreed

I'd include the whole system, also would power all servos up with a sacrificial setup to see if one is locked up.

Check resistance of both batteries. And find good wire to probe or get to the solder tabs.

Do same with bat share.

Test rx with other servos.

Process of elimination is your friend.
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