LiPo

[maddox10]

Re: LiPo

Oh well, I have a piece of foamed magnesium that will fit fine below the 5S 5000mAh 30C Turnegy pack.

Also, using a fitting LiPo bag in the robot, isn't that a better solution? It's light, and made to contain LiPo problems.

[Eventorizon]

Re: LiPo

Would a 1/2mm (I am not sure of the thickness) sheet of Titanium be sufficient to protect the rest of the robot? I think I have just enough space to get a box around each pack (I am using two packs to get different voltages). What about other fireproof/heat proof materials like ceramics, will they comply with the unofficial 2mm plate rule?

[maddox10]

Re: LiPo

I'm thinking about combining 2 capacities in the unofficial 2mm guideline. Foam for shockprotection, and metal because its asked for.

I'm wondering if I can compress steel wool into foamy metal sheets.

[Danjr1]

Re: LiPo

ive now had to bond some 5mm aluminium plates to the 5mm polycarb armour above and below the lipo but the plates have small gaps in to allow wires to pass through. thats the best i can do!

[typhoon_driver]

Re: LiPo

I wouldn't want to put steel wool near a lipo even if it is compressed. Worst case and your lipo does go up then it doesn't take much for steel wool to go up.

Gents to be fair, your machine should have a 2mm plate underneath to protect the other parts of your machines.

Just get a small plate of ti off ebay and job's done.

[razerdave]

Re: LiPo

I had planned for a full metal box for both my feathers anyway just for security and ease of removal.

Dave mentioned above the connectors should handle the max discharge of the lipo. In my case, thats 150A. Its a given than conventional Andersons will not handle that, since they were already melting the housing with the NiMH's in there :P. Deans are, from what I understand, also insufficient, but EC5 connectors may suit purpose.

Can I get some insight from lipo users what they use ? My concern is mounting a new link in Satanix is going to be problematic and it uses Andersons.

[jonny]

Re: LiPo

ec5 connectors =

[Mouldy]

Re: LiPo

Mario- that magnesium comment was funny... Well done?... :|

Dave- deans will be more then fine for satanix... I've tested deans to be reliable at 180amps... They start to weld together at 200a... You won't be pulling that much.

The 2mm metal base rule was agreed to prevent lipo fires causing an arena with a wooden floor to ignite (should a lipo fire happen in the arena) ... So moan all you like, but if you set fire to an arena I doubt you'd be very popular. This rule could do with clarification by Kane... But it's something I'd advise.

[harry hills]

Re: LiPo

who builds a robot with a less than 2mm base anyway?

[razerdave]

Re: LiPo

Not many, but people can build robots with a thick PLASTIC base that could be melted away in the event of a lipo fire.

[chompalot]

Re: LiPo

I was thinking of using kevlar / carbon fibre

[jonny]

Re: LiPo

Can we avoid the metal base requirement if we have our lipos in lipo bags in the robot?

[chompalot]

Re: LiPo

I would think that it would satisfy the requirement, but since it seems to be an event organiser requirement then we would need to seek the advice of the event organiser.
Also it needs to be specified in the rules so that we can design robots which can compete if built to the rules.
Who do we approach?

[maddox10]

Re: LiPo

Mario- that magnesium comment was funny... Well done?...
The 2mm metal base rule was agreed to prevent lipo fires causing an arena with a wooden floor to ignite (should a lipo fire happen in the arena) ... So moan all you like, but if you set fire to an arena I doubt you'd be very popular.

It does what you asked for, being 2mm thick metal. Also, compressed steelwool meets that criteria. Both are utterly daft idea's, as both types burn easely enough with the right kind of stimulation. If I want to pull it to utterly idiotic level, what about 2mm pure sodium. Also metal...

And to prevent a LiPo fire burning down an arena, a 0.3 mm thin fully enclosed steel box will do a better job than a 2mm thick ali plate under the LiPo. As if orientation is unchangable in a robot.
And of course. We could try a Mythbuster alike test. Can a burning LiPo pack ignite a standard arena floor?

BTW, ali can burn quite nicely if the circumstances are right. HMS Sheffield as point in case.

This rule could do with clarification by Kane... But it's something I'd advise.

It's not a rule, as it isn't in the build rules. It's an guideline, yours.

[leorcc]

Re: LiPo

I remember talking with Grant about this in the past, basically if the lipos are contained in something to prevent fire from spreading to the arena floor, and having a fuse in place to catch massive power draws, lipos are perfectly fine to use. Something like a non-flammable metal or fiber weave like lipo sacks have comes to mind.