The company I recently joined is owned and being run by a single person: my boss.
He knew me from earlier in person a little, so he called me one day over the phone, to leave my previous employer and join his company. I met him in person, he told me all about his impressive plans on starting a new business branch which involved custom machine design (let's call it "the prosperity machine"), and made an offer whith such a high salary that I did not even think about not joining. I have 5 years experience in custom machine design, my boss little.
In the beginning everything went fine. I started working directly with him and he mostly talked about his business plans and the prosperity in the future. He gave me little tasks which had nothing to do with my profession, but I thought that's ok, it's just the start.
As time passed by, I found out more and more red flags: high turnover rate among people directly working with him , some mention that he is bipolar, and he also started behaving unusually, telling me that I cost too much for the company and do nothing. - So what would you like me to do then? - He tried giving me some daily little projects, fortunately a little bit more to do with my profession, but every project got stalled near the beginning as he did not agree with my design proposals. Sometimes he even sent me home because he had nothing to give to me for that day.
So one day I told him to start doing the project he hired me for, and design the "prosperity machine".
He finally agreed to this, and started the project by introducing his plans to me. He came to me every day with his new ideas that he was thinking about all night. Filled papers full of drawings, had a meeting with me every day. Whenever I tried to add my ideas or add something to his ideas he just would not listen. He appeared to be completely incompetent in machine design and had the worst and most impossible ideas I have ever heard. I tried to tell him how to do it but he got upset and angry calling me a rebel. He even told me not to think and leave it up to him to do as he says. So I agreed and he often gave me tasks on filling excel charts that add no value to the project, or his regular nonsense drawings. I am a little lost, working on something that makes no sense, leads to completely nowhere, wasting time, yet still receiving a high salary which is being produced by the other people in a different profession (which my boss tells me he hates) at this company.
As I work alone in my profession, I cannot talk to anyone about the project specifics, however if I mention the boss, most people share their bad experience with him, but don't really care as they have their own work to do. There is a co-supervisor at the company who is helpful in every way, but cannot or does not want to help as he is legally just another employee who has been working with my boss for many years and says there is nothing to do.
The "prosperity machine" project itself is not bad at all, the basic concept is viable, so I consider designing and building it. It would greatly help if he would trust me at least little enough that he would let me work.
How can I express disagreement to my boss without him feeling insulted every time I share my ideas?