I want to build a Super-Puma helicopter in city minifigure scale and form, I have the basic design planned, but I am not familiar with any five-sided technic connectors, which I will need for the rotors.

I have thought of a potential idea, but it is still a little too large for city scale helicopters:

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Any better ideas out there?

Update - I had this idea, but it is quite loose, maybe I could tighten it up by using PC dishes on PC sticks (PolyCarbonate pieces used together bind to each other).

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I tried wrapping string round the pegs and they still wobbled, this one's tricky.


5-fold symmetries are difficult to build in LEGO, especially at small scale. Here is an attempt, still a bit bulky...

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LDraw file here.


I think I have a valid semi-legal design, it is good for display models, although Philo's answer to this question provided an excellent design for playing-with models.

Head based rotor system parts

Head based rotor

I now have to decide if I want playabiliy or good looks on the model.

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    If you mount your assembly on a 2x2 rotating tile (3679 & 3680) you have both - playability and good looks :) – Phil B. Dec 9 '14 at 14:23
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    It would rotate better, but there is still a poor connection because of the band as a primary component. If I used the concept that stickers are 'legal' I could increase the diameter of the heads by applying layers until I have a perfect fit, but that doesn't seem fair somehow. – Windfire Dec 9 '14 at 14:30
  • To that point, if I was building for a child, I would definately use Philo's design. As it is, I should build two helicopters, one with each design, and see what I think. – Windfire Dec 9 '14 at 14:33
  • I mounted the assembly on a technic peg in a 2x2 round brick on a turntable. It spins very well, but the blades are at different angles every time it stops. – Windfire Dec 9 '14 at 14:42

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