Starting the MB-5 (v20111202 from
Flight Gear Aircraft Version 2.6 download page) with its impressive contrarotating propellers consists of tapping "SHIFT M" 3 times, "SHIFT }" 3 times, tapping the throttle key "pg UP" 3 times and pressing 's' to start.
The aircraft starts with its brakes off, so it starts rolling on startup. The stick must be held back a moderate amount to prevent a deadly and uncontrollable ground loop, with the MB-5 cavorting all over the field otherwise. I would think the contra-rotating props should have prevented this.
Flight Gear 1.9.1.: Loads and runs* Flight Gear 2.0: Not Tested* Flight Gear 2.4: Not Tested* Flight Gear 2.6: Not Tested
(Anyone running these versions please add the information above)