lipo help

[Mega Masher]

Hi there,
Im having trouble finding lipo batteries for my bw melty
Im using 2 of these motors:
http://www.hobbyking.com/hobbyking/s...00KV_755W.html

And will run them off 4s voltage, but dont know what capacity I would need to make it last the full 3mins

[Mega Masher]

anyone????

[mrsam]

Depends how much space you have inside the robot, Tbh i imagine this would be more than sufficient http://www.hobbyking.com/hobbyking/s...Lipo_Pack.html.

[Danjr1]

http://www.rcgroups.com/forums/showthread.php?t=703489

[Mega Masher]

thanks guys
@sam yeah, that will fit fine. i tried asking my dad about motor to battery power and what capacity i needed, but the figures came out at around 8000mAh, which doesnt sound right.

also, on a completely different topic, would it be better to build a melty chassis (which will need to take a battering!) from:

a one-piece, aluminium shape milled out for parts and the like,
a welded 2mm grade 5 frame,
a frame made from right angle steel and plates of titanium
or any other ideas, i'm open to anything!

[mrsam]

8000mah is definitely not right, most feathers only run about 3000mah. I'd say go for steel or Ti for the chassis aluminium just wouldn't be strong enough seeing as in a melty it's that bit that spins, although i'd maybe go slightly thicker than 2mm just to be on the safe side.

[Mega Masher]

cheers sam
yeah, i thought that 8000mAh wasnt right for a BW.

do you think Mario is the guy to go to for welding and stuff

[mrsam]

Mario's who i would go to for welding yes, he does get pretty busy though so best bet is to message him. Having said that i've never waited more than a week and a half for any work from him.

[Mega Masher]

ok, ill pm him then
sorry to keep asking questions (thats all i ever do really), but what size should a BW be? my guess would be at around 250mm square?

[harry hills]

200mm square or less really. Any more feels heavy and bulky.

[Mega Masher]

thanks harry

that means shred 2 is huge, at a massive 202mm wide

[Mega Masher]

sorry, didnt mean to double post, i forgot how to internet

[mrsam]

Best thing to do would be to buy all of your parts first, lay them down and design your body around that rather than getting the shell done and trying to squeeze everything in, or realising you've made it too big.

[Ellis]

This is a pretty successful US insect class melty brain. The construction is aluminium. If designed correctly the billet aluminium chassis may be the lightest and strongest, as the very high aluminium grades are stronger than steel in some ways. Also easy to secure (and balance) all parts inside as the pockets for the components are simply machined in, allowing a bit of space for some foam.

[Mega Masher]

yeah thanks Ellis, its called Gyro King, and is one of the main inspirations for my new bot. the other one is Spinning Tortoise, which also uses a unibody milled aluminium chassis.

any ideas for a robot name btw
i've already thought of "Traction". any more?