This image shows that the flange and cam gear are not part of the crank.
It takes a 40,000 lb press to knock it off, and it sounds like a gun shot
when it goes. Not exactly ready to "fall off in flight", but we use a safety
shaft anyway.

This is the beginning of the front cover. It shows that the bellhouse can be
cut with a hacksaw. The bellhouse in this image has not been cleaned.

After some cutting, filing and cleaning, you have a nice new piece. The
rear seal is shown installed. Since the flywheel end of the Corvair engine
runs the propeller, the "front" cover houses the rear seal.

Here is the front cover attached to the case. The crank is installed,
as is the safety shaft. Note that the bolts which hold on the front
cover should be drilled and safety wired installed prior to flight.

Here are all the components which make this a modern aircraft engine.
This assembly includes the brackets to mount the alternator and starter,
along with the starter ring gear, and the alternator pulley.

This is how all the pieces are assembled. right to left; The crank,
flange, starter ring gear, alternator 'puck', alternator pulley, prop
hub, washer, and castle nut. What's not shown is the safety
shaft, however it's represented by the rod which everything is slid
over to make this photo.

Here is the completed assembly. Note the safety shaft, nut, and cotter pin. Old style
AN6 bolts holding hub to crank. This is a proved method, and it works! Starter
bracket was later lowered 3/4" Shown is a Toyota starter, Subaru starter is lower.
Ring gear is 10-1/2" dia.

And another view. Shown here is a good view of the starter bracket for
the 100hp 2700cc engine.