Lars, 25BHP sounds about right. This is one of the reasons modern reciprocating engines opt for water cooling, along with better temperature control. This is just one of the parasitic losses that engine designers have to put up with. It will have already been included in the brake dynamometer testing that Lycoming will have done for Robinson...
Still if you could demonstrate a failsafe reliable electric system which did not affect certification, and improved fuel burn, i'm sure Uncle Frank and Mr. Lycoming might raise an eyebrow...
