20 m/s is above the current 'safe' threshold of 15 m/s for the connection strength at the moment. Land slower EDIT: I guess there are settings available for configuring the connections, that haven't been used at all yet, so are only noted on the wiki, or something? No clue if they even work, if so, but... EDIT2: So there are. breakingForce - How much will the attachment between this part and the part it's connected to resist to linear forces? breakingTorque - How much will the attachment resist rotational forces? Still no idea if they actually function as intended at current, but...