Sorry for the late reply Steven Reubenstone, i was a little busy. Abdelhamied Mostafa please share more details on this project first as i am not even know on which platform you are going to work on and if i assume that you are working on Raspberry Pi then there are several TTS Engines on Raspberry Pi and even don’t require internet connection. so you can follow those engines and you have one more option of using some python module. Please find the links for your convenience.
and sorry to say Abdelhamied Mostafa but i don’t find any technical details behind the 3D design of your model and up to my experience with Quadcopters, i am in doubt how your model will be able to fly, Have you worked on the aerodynamics behind the model and simulated it any virtual environment??