Let's Make Robots!

Cosma - Prototype 2

Reports from near space

July 21, 2013

This is a ultra light weighted version of the Cosma robot, especially trimmed for the weather balloon launch. It just weighs 140 g without the battery and shield.

Fig. 1 Front view

Fig. 2 Side view

Fig. 3 Robot mass

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Markus, that's a very light version. How much weights the battery? Did you use LiFePO4 batteries before? What can you tell about them? What qualifies them against LiPo's to get build in to Cosma?

Yes, I have used LiFePO4 batteries before for our weather balloon experiments. Advantage: longer life time, good power density, much safer. The battery I want to use is similar to this one: http://hobbyking.com/hobbyking/store/__17955__HobbyKing_1500mAH_LiFe_3S_9_9v_Transmitter_pack_.html

It weighs 118 g.

maybe I will give it a try in one of my next projects. Thanks o/