1/6 rc stuart tank

[mrtankman]

ps
i am trying to upload pics onto this forum but can't seem to figure out how to do it yet!! i will ask my daughter to help next time she visits!! md

[Jofaur86]

For the pictures ? go to the bottom of the message you want to send ... there is "attach a personal file" I click on it, then appears "photo library" click on it, search for the photo you want, then click on it, then use it must be put alone on the file, (be careful, look although not too heavy) in principle will you induce it? then click on display always in the post "attach file" check on "view" then if compliant, send, in principle each photo has a number, avoid sending the same one twice, I do this from a tablet, maybe differ on another system?
I insist that I'm surprised that this kind of turntable supports more than 100 Amps, I couldn't find any explanation on the web
maybe ? and still I doubt? 180 amps instantaneous, but not continuous

[mrtankman]

cheers matey
still a bit too complicated for me i'm afraid! i will get my daughter on the case... she will sort it out! md ps my email address is mickdady12@icloud .com i can easily forward pics to you this way!!!

[tankme]

I responded to your thread in the electronics section, but there are a few things to add at this point. I was an electronics technician in the Army so I was trained how to troubleshoot AC/DC circuits so you can take away anything you like about what I have to say.

You are confused about your battery rating. The original 12V battery for the Stuart is a sealed lead acid battery rated at 7AH unless you have changed it. That does not mean it delivers 7A or that it can't deliver more than 7A. "Amp hour" (AH) ratings means it will deliver 1A for 7 hours or 7A for one hour hence the 7AH rating. Of course if you draw more than 7A out of it you will just get less than one hour run time. That battery would have an upper limit as to how much current (in amps) it could supply at a time, but I doubt your motors are exceeding it. The thing you are probably fighting here is heat and possibly voltage. A 12V battery charges up to 13-14.5V when fully charged. That exceeds the HL 12.6V capacity. Similarly a Lipo battery that is rated at 7.4V will be fully charged at over 8V.

As I said in the other thread, there is no way of knowing what part of the equation at this point is causing your issues. It could be an overvolting of the HL controller, it could be drawing too much current from your motors, it could be a thermal shutdown of the HL controller, or it could be your batteries aren't supplying enough current. That being said, if your motors were really trying to draw that much power out of your battery, more than likely you would be damaging your battery and not the controller if the controller was capable of drawing that much current from the battery. Without a multimeter or testing with some fuses there is no way of knowing what your issue is. Quick question, have you tried testing the HL controllers after you suspect they blow using a smaller motor and the regular 7.4V battery? That could eliminate some of the possible causes. If it works using the stuff normally connected to it, it was probably an overcurrent or thermal shutdown. The problem is I don't have any specs on the HL boards to tell if they even have overcurrent or thermal protection. Was the controller really hot after the failures occurred? Heat is your enemy in electronics. I know others have used 1/16 scale controllers in the Stuart tanks, but most of them use fans to keep the heat down on the controller.

My educated guess is that the motors you are using are exceeding the rated current for the HL controller. The stock 550 motors used in the Stuart are at the edge of what they typical 1/16 tank controller can handle. Your motors draw more current than a 550 does and therefore I would suspect that is the issue.

[tankme]

Further info about your battery if it is the stock battery:

Some battery manufacturers give a “C” rating, which is a ratio of maximum output current to capacity. If this rating was given a unit it would be inverse time. For example, a 5C, 7Ah battery could provide a maximum safe current (ie. without inflicting permanent damage) of 35A (5 x 7).

Some high performance lithium polymer batteries used in RC models have C ratings of 60 or more, meaning that a 2Ah battery could produce 120A. Your battery, going by the given ratings, is an SLA battery like those used for backup power. Typically these are tested up to 3C (in your case 21A), but don’t perform terribly well at this discharge rate and will exhibit significant voltage drop.

[mrtankman]

wow matey
thanks for your lengthy reply! way over my head though! tell you what i did though! i wired the 12v 7amp lucas battery to just one of the graupner 12v 600bb turbo motors! the track kicked off straight away at 12v speed but after about 2 mins it slowed down quite a bit! i tested the battery with a multi meter and it was down to about 10v?? i fully charged the battery before the trial!! the lucas battery i used is for childrens electric cars so they take some load power me thinks! can't figure it out matey! complete mystery!!!! md

[mrtankman]

ps got pics of the inside of my stuart but can't upload to this forum! md

[mrtankman]

another ps yes i tested all three heng long tk's after on normal 7.2v tank and all three malfunctioned in some way or another!

[Jofaur86]

is your battery recent? or already served? what type of charger are you using? because it seems to me to drop quickly in voltage, personally I would say that the sign of a tired battery, it is a lead battery, and ages very quickly if not maintained regularly, have you taken the intensity consumed during operation? multimeter in 10 A position, connected in series in the plus

for information, sorry, in French. But google translate is your friend
http://rene.souty.free.fr/IMG/pdf/ct_ut ... imetre.pdf

[mrtankman]

hiya
don't think i charged the battery long enough matey! had it on charge for about 4 hours and just tested it with a multi meter at 12.47! ran one track for about 5 mins and voltage never dropped! maybe need to leave the battery charging over night or something around 6 to 8 hours? md