Actually, the technology is already there for rc minature hyds. The only relevant question is how much do you want to spend Neil?!
Speaking of K.I.S.S., why re-invent the wheel?
The possibly of high efficiency from Leimbach's (one example) mini hyd system with a conventional radio is in direct relation to operator skill vs life sized equip with it's computer compensated, load sense systems that does all thinking for an inefficient operator.
This new idea of using a computer programmable radio for ch mix, esc on pump... nothing will ever top that for maxiumizng low amperage consumption for this rc hobby... I betcha a looney.
