No, you're looking at it correctly. The L arm will be pulled backwards when the grill door is open. I'm not too worried about it as it'll be made of something hefty and its lifting a really really light door.
Closing it at speed is a question that I don't have an answer to yet. I don't know how much psi will be building up on the door. I also don't know how much torque the actuators put out, but its not a weak device. I could always add another actuator if need be.
Another concern is keeping it closed at speed. Once the actuator powers down, is the motor and gearing in the actuator enough to hold it there? I'm not sure. Me and Metro were just talking about this actually. There are multiple solutions though. The simplest would probably be to use some magnets to hold it closed.
If all else fails, a sliding door would be the next step.
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