Carsten Svendsen

In all actuality, it's the very last option that he wants to look at. That's what I was remembering with, but it's only one diff, not two. And by default, it has a built-in gear ratio. 1:1 straight through, and whatever you want on the actual hub, you've got many options

It's simple if you don't need power transmission. Just put a gear on a floating beam, and have two outputs, then link them back together. Otherwise, just use two differentials with a simple directional gear stopper on both (but opposite sides of course) I wanted to do an illustration with a 3D model, but actually, I forgot how it goes together, so sorry, I can't help afterall. I have no access to my LEGO atm. Also, using Studio is just the worst, I swear that if I win first prize in lotto, first thing I'll do is hire a team to rebuild what Sergio had with SR3D Builder. At least that program was easy and intuitive to use.

That flip flop L-beam though

Hi, check out these threads:

I still think that this is such a cool build! Way to go man

A video would be a lot easier, to see what you're up against. It should be able to rotate easily, I've build this model a couple of times in the past as well, and I don't remember this problem that you're having

I had a dream once of building a roller coaster too, but I could never figure out how to make the most important thing - the train. The wheel base was simply too difficult at the time to achieve. Your design seems to be lacking as well, I'm sure you can improve on it somehow to not lose out on so much speed. And in this day and age, we have so many micro-pieces available, that I would be surprised if there isn't a solution hiding somewhere.

This is correct. Both 24T ends should be on the same side of the model

It was very cool to see this contest through! I wish I could've participated

That axle has been a wish of mine for DECADES! It's everything you need to make a proper working PTO on tractors and other equipment. Now we don't have to line up all kinds of weird geometry, and can actually make it like it's meant to be

The problem wont be the blades, the problem will be the motors. You'll have to go with RC motors or something, and also, the amount of stress applied to the rotors of a helikopter is insane, especially if it's made of plastic. I would suggest not to spend too much money up front to get it working, but definitely go and build a cool model!

Oh, that's so clever! I still am not entirely sure how it works, but I think I got it. Very cool! I'm impressed with the amount of functions you've managed to incorporate here

Cool, But I would also like to see the thrust reversers That's one of the things that really impressed me as well!

Why would you want to paint it, when there are already so incredibly many colors available? Painting is like blasphemy honestly, you wouldn't even be able to use the pieces again later.

No, I have taken it completely to bits and all the parts have been sorted into their respective containers. It just took up too much space for a failed model. More experienced brain, or lots of useful references to steal ideas from ? But you're right, I do have a lot of experience, it seems to me also that your part selection was, maybe not super limited, but limited to some extent, causing you to build in a certain way. LEGO's designers aren't just one brain about building a kit after all. But yeah, it'll still be a few more years before I'm reunited with my LEGO. It's currently sitting in storage in New Zealand, and I'm in France for the foreseeable future, and then god knows where after that.