Originally Posted by
ApolloHeli
For those wondering, Guimbal states that the plasma will take >10 hours to drain the battery if the master were to be switched off.
Yeah, I was wondering. Thanks for making this clear. Now in an ALT failure you do *not* switch off Master. The emergency procedure in a Robinson piston is to leave Master on, but switch off non-essential electrical consumers (lights, strobe, second radio, TPX, air con, RA).
The (non-documented) time the battery will last in this scenario is between 15 and 60 min before total electric failure, with an estimated median of 30 to 40 min. Not sure what drains the battery most, but essential consumers would include the gyro instruments, avionics fan, the remaining radio, any glass instruments and the panel-mounted EFB... Can't think of much else.
Would be the same in a Cabri, not? Only difference I can see is that from the point of total electrical failure in a Cabri you only run in one sets magnetos, so no more redundant ignition.