Ni cads

[Guest]

Ni cads

SolidWorks costs a fortune, and not even an evaluation version is availible for download. You may also want to check out these, but dont hope for anything:

http://www.solidworks.com/pages/programs/robotwars/index.htmlhttp://www.solidworks.com/pages/prog...ars/index.html
http://www.solidworks.com/pages/programs/battlebots/index.htmlhttp://www.solidworks.com/pages/prog...ots/index.html

Rhino is also an option, and a much cheaper one too.

[kodster]

Ni cads

Thanks Andy

Team Gore

[team_ireland]

Ni cads

At the RODs event in ireland Janurary 2004, Draven had several of there Saft F cells fail (i think its an f cell anyway, there the same as behemoth and stinger use). They started off with a 24v back and by the end of teh week they were down to a 16.8v pack. So perhaps the only ones really suitable for heavyweights are the sanyo 2400, 3000 and 3600.

Regards
Ian

[jcover_ja]

Ni cads

has any one looked at the twincell NiMH line from sanyo. here is a quick comparisaon between the commonly use N-3000CR Ni-Cad Cell

N-3000CR Ni-Cad - 3Ah - 84g (size 25.2mm x 49mm)

now the twincells

HR-4/3FAUP - 3.6Ah - 58g (size 18.1mm x 67mm)
HR-DU - 9Ah - 178g (size 34mm x 59.3mm)

now thats power the only thing is I wonder if thay can produce the amp.

[mark_m]

Ni cads

A quick google found a datasheet for those batteries:
HR-4/3FAUP - 3.6Ah - internal resistance 6mOhm
HR-DU ------ 9Ah --- internal resistance 5mOhm
N-3000CR --- 3Ah --- internal resistance 3.4mOhm

This suggests to me they wont be as good at sourcing high currents. They are listed as Industrial High Current though, so they might be ok for featherweights with not too high a current demand.
I think Nimh tend to be rated for lower currents than nicads, even when there internal resisitance is the same, eg the GP330SCHR - 3.3Ah - 60g - internal resistance 3.7mOhm, continuous current only 45Amps

The important thing for me for any of these though - can you find them cheap? :-)

Mark