Originally Posted by smash
The g-forces of aerobatics can cause the contactor to close thus engaging the starter uncommanded. He advised to mount it 90 degrees to vertical. How are others mounting their starter contactors?
First, neither of those are starter contactors. They are both continuous duty contactors, in this case, for ground power and bus cross feed. They are not part of the kit and Van's has no responsibility for them.
Second, for what it's worth, the starter contactor supplied by Van's in the firewall forward kit mounts at about a 45° angle.
I have no knowledge about the efficacy of the SportAir workshop remark.