Two hector_quadrotor connected with a rod [closed]

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Hello, guys

I'm trying to simulate a system where I have 2 (on the future more) quadrotors connect between them with a rod. But it is not an ordinary rod, which would make their motions limited. It's a physical link that fixes the distance between them, but doesn't limit their movements. I already have two quadrotors which I can control both simultaneously with a Taranis TX in gazebo+ROS. I'd like to know exactly how would I create a model, where I have 2 quadrotors that are fixed in distance from one another. I don't know if the best way to do it is by modeling the rod or just making an imaginary link. Either way, I'd need help with it.

Thanks in advance, Pedro