Every time you ask for feedback, I hesitate to post this. You're very passionate about these ideas, and I know it's been a lifelong quest. I'm not doing this to be discouraging. I just know what it's like to put stuff out there and hear mostly crickets (if that's what's happening for you). I'm completely unqualified to comment in any meaningful way on your ideas. I'm hoping that hearing something is better than hearing nothing. We test our mental models by exposing them to the world and taking in feedback. What we do with that feedback is entirely up to us. So, in the spirit of trying to honor your request for input... A) I think you need to be submitting your ideas to people qualified to understand, evaluate, discuss, promote, and/or extend them. For example... https://summit.aps.org/, https://en.wikipedia.org/wiki/List_of_physics_conferences, https://www.iop.org/physics-community/iop-conferences, https://internationalconferencealerts.com/usa/physics B) I agree that most people don't really care about flying cars, hoverboards, or floating cities. I would want an application that solves a current problem or meets a current need. A flying car is essentially a plane or helicopter, and would be subject to the same laws and regulations about where you could go. Other than maybe some highly-constrained fun, I don't see how it would improve my life. I couldn't fly to Paris for the weekend and land on the street without being arrested for crossing the border illegally. I couldn't fly to work without violating the city airspace rules. A floating city would have all the problems of every other city, except way more (like access to water, electricity, food, dealing with waste management, exposure to threats from below, and high altitude sickness and increased UV exposure for the people).

I agree the hallowed halls of academia can have impenetrable gates without having the "right" credentials. By way of encouragement, I have a simple degree in graphic design, and I've been able to connect with professors at Cornell and Harvard, and every author I have reached out to has responded. I simply offer up thoughts I've had or something I made based on something they were working on, so the connection is genuine. I don't want anything from them other than to engage over a subject I know they have spent years exploring. Who are your heroes in the field? Try to connect with them. Ask them about something specific they did, and how it relates to what you are trying to do. Use your LLMs to refine your message for a technical audience. Identify your conundrum, your inconsistency with the established science, summarized to a clear point. If it's compelling, and creates cognitive dissonance, when you share it they will want to engage to resolve it. I think my point about the push cart was that if that was shown to be possible, then everything else would be as well. The gap between idea and any demonstration at any scale is both razor thin, and impossibly wide. A thing can't be done, until it can. This doesn't mean that all impossible things can become possible, but some can. This is the very process of invention. Belief is an important motivator, but the gap doesn't care one whit about it.

So after all these years, I finally tried my skate carrying strap by using a couple of D-ring canvas belts. And guess what..? It didn't work at all! LOL The odd shape of the skate don't play nice together, and they have a sloped front that seems to need another strap around the back of the skates to really hold them, and it's really fidgety to hold the strap and get the first skate lined up, and..., and..., Less here for me: make a bad prototype right away with whatever you have laying around. You might learn something right away that affects the entire future of the project. For me, it was "this doesn't work at all, and it would actually add frustration to use it!" However, it could also have shown me "wow, this actually works. It needs some development, but it's really worth doing!" That's not the case for this project, but that frees up time and mental resources for other ideas that might work! Have an idea? Make a simple prototype as soon as you can.

@Phyllis Dawkins Clever! I love when a shape you see for one thing inspires an idea for something completely different!

Biggest challenge as an inventor? Trying to predict the value of the idea before real people have seen it. I've seen lots of ideas get hung up in market research, funding, IP protection, long prototype development, when a weekend in a booth at a customer show can give you dozens or even hundreds of data points. So many ideas I've taken to pinball shows to sell. We were armed with target audience, projected sales, all kinds of predictions. And, within a day we knew what was actually interesting people, and what wasn't. It was always surprising. What we thought were the coolest things many liked but didn't want to buy. Many of the simplest things they bought all we had and wanted more. Only one of dozens of products took off. However, we now sell it in over 20 countries. We never could have predicted which one would be a hit. In hindsight, we just had to put all of them in front of people, and see what they liked. "It's tough to make predictions, especially about the future." - Yogi Berra

Here's a snowmobile gear drying rack I designed. Never built one though, so I don't know if it works!

@Louis Lockett, Sr. The tarp would be reinforced vinyl, like a leaf-racking tarp, except with added sewn pockets in the corners. The framework is collapsible tent rods. Tarp example here: https://www.amazon.com/Reusable-Waterproof-Collecting-Collector-Clean-Ups/dp/B0B9324B5T