Ok thought that I would make a new topic, because that other one is getting a bit long in the tooth, and not sure how many people still read it, hehe, no offense intended!
This is my idea, that I'm pretty sure won't work, but I just had to try.
I believe this is as close as you can get being 100% Lego.
Unfortunately I broke 2 motors trying to straighten the axle between 2 props (Don't do that!)
I have spares, but won't be able to film now till this evening.
What are your thoughts on this design?
These little motors do pack a punch but have a limited lifespan of 200 pulls.
This model weighs in at 40 grams.