UK Kilobots - 1.362kg (3 lbs) Combat Robots

[Mouldy]

I think 180 and 360 should do a dance video... for other fat lazy robots to work out too

[MattPPA13]

would be a hat-trick if you could get hypno-disc to lol

[widow_twanky]

Got a bit of 100mm x 50mm aluminium box section and have now mocked up a bit of a chasis for the kilobot (it weighs about 500g so far so this one might just get in the weight. I have a few lipos which i got a while back which are 11.1v/800mAH/20C.

I have one of these kicking around and looking at it it'll fit and it still leaves quite a bit in terms of weight for a drum on the front. http://www.hobbyking.com/hobbyking/stor ... oduct=4909

Firstly I reckon it's a bit overpowered for both the battery and the robot but would like some idea on peoples views. Never used brushless before so just getting an idea for it.

Also I will be using a car type fuse as a removable link and would like to get this sized properly for the lipo. I was thinking about 20A would be sensible but again some advice would be good.

[Kenny]

to compare the motor for the disc in 180 weigh's 45g so yours is a beast of a motor lol

[widow_twanky]

to compare the motor for the disc in 180 weigh's 45g so yours is a beast of a motor lol

So a bit big then?? might just use one of the brushed ones I have then and use the weight on the drum

[grant_ploughbot]

Well your battery at 20C can kick out 16A, and that motor draws about 50A, so yes far too big for your robot. The Speed controller for it would be pretty heavy too i expect.

I would look more towards either a much smaller brushless or a brushed motor with somethijng like a battle switch to turn it on and off.

[widow_twanky]

Well your battery at 20C can kick out 16A, and that motor draws about 50A, so yes far too big for your robot. The Speed controller for it would be pretty heavy too i expect.

I would look more towards either a much smaller brushless or a brushed motor with somethijng like a battle switch to turn it on and off.

Yep got the message!!! So would a 20A fuse on the battery provide enough protection or would I be better off going for a 10A or 15A................or is it just a case of try a 10A fuse and see if it blows under normal use?

[Mouldy]

I'd say use a 10a automotive fuse and see how you go. Auto fuses don't blow at there stated rating. I'd suggest a smaller motor or a bigger lipo though.

[widow_twanky]

I'd say use a 10a automotive fuse and see how you go. Auto fuses don't blow at there stated rating. I'd suggest a smaller motor or a bigger lipo though.

I'm interested...............exactly what is the purpose of the fuse. I am talking from the point of view of the technical reason. I am well aware of what fuses do but just want to know the purpose of it and what type of current it is overload or short circuit or both.

The reason I'm asking is because if it's to protect against overload then the fuse size is significant, if it's to protect against short circuit then it's not as significant as the short circuit current would be massive in comparison to the normal currents used from the battery.

(got the message on the motor size )

Andy

[Mouldy]

The fuse is to protect your robot from pulling more current then the maximum discharge rate of the lipo. Over discharging a lipo will cause the cells to become damaged, which in turn can cause ignition of the pack.