RE: TBM 93
It's a pretty good system actually.
The ignition is a modified unit that controls the starter. It can also be programmed to manage the choke so in theory, all you have to do is hit a switch on the Tx and off she goes.
The starter motor is just one of the MVVS electric motors and the gear is a typical Bendix type gear with a Torrington bearing at front
There is some weight penalty involved (starter, ESC and a 3-Cell LiPo battery) but in a warbird, we normally carry around lead in the nose anyway so it doesn't make much difference