Marvin how do you find your medusa on 4s mine seems a little tame and i am thinking of running it on 5s/6s
Rc-monster gets my vote top quality conversion
i have heard too many bad things about losi esc's/ lipos to go anywhere near them
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cars:
vintage 1988 tamiya grasshopper
Brushless CRT.5 - Mamba max - medusa 36-50-4800 motor - ftx 5K lipos
Brushless CRT - Mamba monster - Neu motor - RCPD conversion kit {for sale}
Ebay items :
http://shop.ebay.co.uk/merchant/terzo53