I have contacted Alien power systems to solve the motor/esc combination. I said that 2 kg weather proof motor with 50 inch prop could be a starting point. To help us, they are asking what rpm do we expect?
I know that blimps do not need high rpm as they already float. What rpm should we expect upon your opinion?

First step is that we make the feasibility study which will cover all main aspects of the Blimp. Based on that we will know much better the complexity of the build and decide together how and if to proceed.

- Calculate all weights of systems and subsystems

- Identify all parts, electronics and equipment that will be used to build it

- Make a detailed 3D

- Total price and build time

I expect up to 10 days to finish this first step in the project