Davidz90

Proof of concept for 1920/30s car suspension. Leaf sping suspension+steering+pronounced positive camber. 20240830_105124 20240830_105202 Amount of camber can be regulated by sliding a conenctor 20240830_105135 The wheels are 10-spoke cart wheel (#33211) with tire 30.4 (6578 / 75777) stretched over it. 20240830_105151

I measured 33 cm with outriggers dropped and 37 cm with horizontal.

Thank you very much! Indeed, it is very satisfying to have a hard copy.

Very impressive!

Thanks! A little update, now the book is available as e-book too.

Thanks! Yes, the book is sold with 0 royalties. Printed edition is a little more polished and somewhat expanded (extra 26 pages). I'm glad that you could learn some new things from the book, that is the main goal

My book is now available on Amazon! Link: https://www.amazon.com/dp/B0DDQ7ZJDS And here how it looks in print: 20240826_095518 20240826_095534 20240826_095525

True. Especially at this small scale, there's only so many ways to build a space shuttle.

Very cool! Definitely one of the more important simple mechanisms that Lego lacks. Extremely useful not only for a gearbox, but all sorts of other things too. This, a proper snail cam and a 32t gear are my three biggest Technic wishes.

Built this today. All functions work flawlessly. One thing noted in the review above is that the pneumatic pistons didn't want to work at first, so I thought that some pneumatic tubes are connected incorrectly. Turns out, pistons were seized up, manually extending/retracing pistons a few times solves the issue. One more thing, the rear attachment of the main sail seems to be 1 stud too high. After reworking this part so that it is 1 stud lower, sail is more straight. Nevermind, I made a building mistake Amazing set overall. I wonder if the sails can be used as wings in a glider. They should have enough area to reasonably carry a (somewhat heavy) Lego structure made out of long axles.

Not only you, and fixed this. In next edition of the book, links will be clickable.

Very interesting! Love the hollow clock face. Escapement is interesting as well, never seen panels used like that. I suppose the 6-sided escape wheel made gearing easier than, for example, 8-sided propeller/fan piece?

Thank for your kind words! Indeed, my goal was to start from familiar, middle school-level topics and then expand on that slightly without making it too extreme. Books on "real" clocks tend to be quite intimidating on the math side, I wanted to avoid that.

I tried this page: https://www.ilovepdf.com/compress_pdf and the tool worked wonders. From 200 MB to 7 MB, with acceptable loss of quality. Here's the link to compressed file: https://drive.google.com/file/d/14UGLVgzmjaSFc9WcAOOROEmHh8wI8irh/view?usp=sharing

Thanks! I'm looking at Amazon self-publishing right now. To be viable for print on demand, some tweaks to margins etc. will be needed. Also, there's some material I haven't covered in the book yet, possible Amazon version will be at least 50 pages longer. But that will take at least a month, I'm pretty busy with other stuff now. Any suggestions about what to add will be appreciated. Don't intend to make any money from it.

I love nerdy, old school things! Learned programming in Pascal and it's still my fav. language despite switching to C++ long ago. The electronics side of things is way over my head but this is truly fascinating stuff!

Here's the link to the pdf: https://drive.google.com/file/d/13KHG4cGL_pBnUNBb77ap_iJrk3VJtqkI/view?usp=sharing

Thank you very much! You are of course totally right about centrifugal force, in fact I think this is a bigger factor than non-roundness of Earth. I'll add that. (and while we are at it, a short section on Coriolis force and Foucault pendulum would fit there as well) After so much encouragement, I'll definitely look into publishing this on paper after more polishing and expansion of some sections.

Thank you very much!

Thanks! I'll definitely look into publishing option. Feedback is very welcome!

Here's a new cover: Cover_1 and link to the pdf with new cover (I kept last one to not break any links): https://drive.google.com/file/d/13KHG4cGL_pBnUNBb77ap_iJrk3VJtqkI/view?usp=sharing Also, a few more example pages: 13 11 9 Thanks a ton! Thank you very much! True, fixed that in new upload with nicer cover.

Wow, thank you very much! Will do! Thanks!

Huh, that's really interesting. Thank you very much for the info! Could you post some links to your books? Thanks!

Thanks! For stuff that runs less than an hour - sure, windup motor is perfectly fine (although for half an hour, 2 or 3 may be needed). Some of the small examples are powered by it but you are right, discussion of spring power in general is missing. So-called anniversary clocks can run for over a year on one rewind of a sprign, which is mind-boggling.

Okay, thanks for the information! I'll look into it.