MOCpages : Share your LEGO® creations
LEGO models my own creation MOCpages toys shop Spinjitzu burger tops
Welcome to the world's greatest LEGO fan community!
Explore cool creations, share your own, and have lots of fun together.  ~  It's all free!
Spinjitzu burger tops
Rate it  12345       Add a comment Add a comment   Zoom in  Zoom in
My longest-spinning LEGO tops yet: 212 sec (3:32) by hand, and 272 sec (4:32) by manual spin-up tool! The fluorescent blue one looks cool under a blacklight, too.
About this creation
Please feel free to look over the images and skip the verbiage.

Recently got my longest hand-twirled spin ever (192 sec, 3:12) with this heavy streamlined Spinjitzu top...



The weighted black Spinjitzu turntable had a lot to do with this success, but so did the low-friction spinning surface underneath -- a glass concave lens greased with forehead oil.

Well, if one Spinjitzu turntable works that well, what about two?





∧ Meet my newest record-holders: The purple "Spinjitzu burger" for the longest hand-twirled spin time (212 sec, 3:32), and the fluorescent blue for the longest spin by manual spin-up tool (272 sec, 4:32). We'll call them "Barney" and "Elka" for short.

Elka's record was set with this 3-stage planetary spinner with 1:64 overdrive. Both runs were on the lens.



But there's a catch: To get a Spinjitzu burger to stay up more than 90 sec or so, you need to spin a sleeper -- i.e., a top that spins quietly with a vertical stem until the bitter end.

The good news: Burgers really like to sleep on level surfaces with even a little traction. The bad news: Slippery concave surfaces make them precess from the get-go unless you let go just so. (It's a moment of inertia thing.)

So, it takes a very lucky spin to get a Spinjitzu burger to sleep on this or any other greased concave lens. Using a spin-up tool improves the odds, but not by much. That makes it hard to shoot record runs at several minutes a pop.

But you can see how Spinjitzu burgers move with some good to so-so spin times...



Presenting well-behaved tops to the camera within a reasonable number of takes means holding back on your spin-ups in cases like this. Even so, the sleeping burger in the opening blacklight scene stayed up 150 sec, and the single-turntable top at the end, 140 sec. As usual, the precessing spins in between were much shorter.

≪ Back to top




Design notes

The 2 main things limiting spin times in LEGOŽ tops are their aerodynamics and low average rotor densities (usually well below that of water). Pushing the envelope means attacking on both fronts, and these Spinjitzu burgers were designed to do just that.

The high-density turntables had to be joined face-to-face by their studs for rotor stiffness alone. A rotor that doesn't deform under normal use is a must for smooth spins, and smooth spins are a must for record spin times.



This burger-bun arrangement packs 68 g of mass into rotor only 47 mm in maximum diameter and 48 mm in length -- an exceptionally high rotor density for a LEGOŽ top.

But the arranagement is also very good aerodynamically, as it exposed only smooth, rounded turntable bottoms to the fast relative air flows above and below the rotor.





The unavoidable gap between turntables isn't so good aerodynamically, but some gap configurations turn out to be much better than others, as we'll see.

Streamlining the upper and lower rotor surfaces pays, as they produce most of the drag on a top presenting something like a spinning solid cylinder to the air. But Spinjitzu turnables have more aerodynamic bottoms than others. The one on the right yields significantly shorter spins.



Plan A was to recruit all available studs to join the turntables, but the outer eight proved sufficient. Technic 1x2 liftarms with 2 pin holes (43857) turned out to be best stud connectors.



Unexpectedly, eliminating the inner liftarms made the tops spin longer! In retrospect, I think this was mostly because it reduced the resistance met by air trying to flow around the outer liftarms.

Bridging only the outer studs had the added advantage of (i) lowering each top's center of mass, (ii) increasing its axial moment of inertia per unit mass, and (iii) decreasing its transverse moment of inertia about the tip. Together, these factors lowered the critical angular speed at which the top begins its fall.

Oddly, joining the turntables with thin rather than thick liftarms, or with just 4 Technic 1L pin connectors (18654), had a negative impact on spin time -- presumably for mostly aerodynamic reasons once again.



You can join the upper turntable to the lower in 4 different orientations, but only one of them yields the smoothest spins, so test, test, test! To smoothe Elka's spins even more, I relieved the turntables of their shaky minifig foot clamps. Here's an LGB clamp in an unused turnable. I'll probably declamp Barney, too, but not a word!



All of my Spinjitzu burgers use the same tip assembly as my single-turntable Spinjitzu tops. This tip is my go-to for long, smooth spins with little travel.



The tip proper, cut from the end of a round-tipped 4L antenna (3957), lasts a surprisingly long time if you avoid dents -- and you will if you don’t drop the top tip-first. The surface abrasions visible here are unavoidable but seem to have little effect on spin time and smoothness.

To get record spin times, you need to spin your best tip on the smoothest, lowest-friction surface possible. When smeared with a little forehead oil, this shallow glass biconcave lens is the best I've found. (NB: Some glasses generate a lot less friction against ABS plastic than others.)



But it usually takes many tries to get a Spinjitzu burger to sleep on a surface like this, and without a sleeper, you'll be lucky to break 90 sec. The added stem control provided by most spin-up tools helps, but spinning a sleeping burger on any slick concave surface (including a cosmetic mirror) is still hit-and-miss.

In part, I chose yellow for the non-turntable elements because this normally bright color becomes almost black under a blacklight in the dark.


Overhead LED can lights


Overheads + blacklights
Blacklights only


This low UV reflectance makes the yellow liftarms between Elka's turntables all but disappear against the bright fluorescent blue in blacklit motion, and that makes the upper turntable look like its hovering in mid-air.

≪ Back to top




Specifications (Elka)

Construction:Studded
Colors:Yellow and fluorescent (trans-medium) blue
Rotor:2 Spinjitzu turntables joined face-to-face (94% of total top mass)
Overall dimensions:47x90 mm (DxH, including stem)
Mass:68 g
CM height:~25 mm
Tip radius of curvature:1.5 mm
Grounding angle:29°
Release speed:~1,400 RPM by hand, ~3,200 RPM by spinner
Critical speed:~600 RPM
Spin time:212 sec (3:32) by hand, 272 sec (4:32) by spinner
Modified LEGOŽ parts:Minifig foot clamps removed from some turntables; tips cut from 4L antennas
Non-LEGOŽ parts:None
Credits:Original MOCs
See also:LEGOŽ spinning top folder, recent Spinjitzu tops, Blacklight tops

<< Back to top




Comments

 I made it 
  April 24, 2017
Quoting Didier B Nice ones Jeremy ! The main picture is very nice.
Thanks, Didier! LEGO + blacklight = fun.
 I like it 
  April 24, 2017
Nice ones Jeremy ! The main picture is very nice.
  April 24, 2017
Nice ones Jeremy ! The main picture is very nice.
 I made it 
  April 15, 2017
Quoting Oliver Becker Like real burgers, appetite for more...?! Your imagination and engineering is TOP, my friend! ;)
Oliver! Great to hear from you after weeks away! (Hope you were having fun.) If it weren't for the metal rings inside the turntables, I'm pretty sure my dog Roxie could eat one of these burgers. With the exception of the Chuck-It 2-inch rubber basketball, we have yet to find a toy she can't destroy in under an hour.
 I made it 
  April 15, 2017
Quoting Nick Barrett Pretty sure I could eat a burger in 3:12. And now I'm hungry...
Ha, it's working! Now I can pitch to McDonalds for a sponsorship. May I use your testimonial?
 I like it 
  April 15, 2017
Like real burgers, appetite for more...?! Your imagination and engineering is TOP, my friend! ;)
 I like it 
  April 12, 2017
Pretty sure I could eat a burger in 3:12. And now I'm hungry...
 I made it 
  April 9, 2017
Quoting Sir Flexalot Awesome! The lens looks awesome in the black light pic!
Thanks!
 I like it 
  April 9, 2017
Awesome! The lens looks awesome in the black light pic!
 I made it 
  April 8, 2017
Quoting Henrik Jensen Looks really cool with the blacklight on, and what an amazing spintime! By the way; I`ve rejected your invite to the gizmo group, because I don`t have any suitable creations to share there. I`ll gladly join the group, the moment I have something useful or fun.
Thanks, Henrik! You're welcome there anytime.
 I like it 
  April 8, 2017
Looks really cool with the blacklight on, and what an amazing spintime! By the way; I`ve rejected your invite to the gizmo group, because I don`t have any suitable creations to share there. I`ll gladly join the group, the moment I have something useful or fun.
 I made it 
  April 8, 2017
Quoting jds 7777 I've never seen two of those spinners put together before. Very creative as usual! Congrats on setting a new personal record! Do you know if it's the highest of any Lego tops?
Thanks, JDS! It came to me when 8 new turntables arrived from BrickLink last week. "Man, what am I gonna do with all of these??" Haven't seen spin times anywhere near this long on the web, but it's not exactly crawling with LEGO tops, and no one I know makes them. But who knows what goes on behind closed doors?
 I like it 
  April 8, 2017
I've never seen two of those spinners put together before. Very creative as usual! Congrats on setting a new personal record! Do you know if it's the highest of any Lego tops?
 I made it 
  April 7, 2017
Quoting Sven ;o) Hi my friend, just wanna let you know that I sent you a mail yesterday. But could be possible that it ended up in your spam folder ;) Greets.
Thanks, my friend! Didn't go to junk mail, and I just replied. Glad we're in touch.
  April 7, 2017
Hi my friend, just wanna let you know that I sent you a mail yesterday. But could be possible that it ended up in your spam folder ;) Greets.
 I made it 
  April 6, 2017
Quoting Samuel "samiamuc" Charbula Is forehead oil oil that you put on your forehead or oil taken from your forehead? I'm a teen so I've got lots on my forehead os it makes sense, but to treat it I put other oil on so I don't know which you're using.
Thanks, Samuel! Fair question. It's the oil produced by everyone's forehead, and it's the best and cheapest lube for tops. Isn't it good to know that the stuff is good for something besides smudging your glasses?
 I like it 
  April 6, 2017
Is forehead oil oil that you put on your forehead or oil taken from your forehead? I'm a teen so I've got lots on my forehead os it makes sense, but to treat it I put other oil on so I don't know which you're using.
 I made it 
  April 6, 2017
Quoting Oran Cruzen Excellent Jeremy! This is Benny: http://lego.wikia.com/wiki/Benny_(The_LEGO_Movie)
Thanks, Oran! I think you answered that question before, and I spaced on it. ;^} Don't forget that you're dealing with another VOAFOL here.
 I made it 
  April 6, 2017
Quoting Jonathan Demers Really good work making those! My favorite is probably the fluorescent blue one. Would you be interested in doing an interview with me for MOCpages News?
Thanks, Jonathan! Yes, I'd be flattered to do an interview. MOCpages News is a great idea, and I just accepted your invitation to join the group.
 I made it 
  April 6, 2017
Quoting Nirds forprez Fun, creative, educational and even academic; all descriptors that have been used before to describe Lego. Beautiful? Not so much. Until now. Your top under dark light is just that. Beautiful.
Much too kind, NFP! When you see someone with a deep tan on just their hands, you might be dealing with a LEGO blacklight top addict like me.
 I made it 
  April 6, 2017
Quoting Clayton Marchetti That's an amazingly long time. The black light does look awesome. Excellent engineering!
Many thanks, Clayton! Two of the main things limiting spin times in LEGO tops are less than ideal aerodynamics and low average density (generally well below that of water). These weighted, smooth-bottomed Spinjitzu turntables really help on both fronts.
 I like it 
  April 6, 2017
Really good work making those! My favorite is probably the fluorescent blue one. Would you be interested in doing an interview with me for MOCpages News?
 I like it 
  April 6, 2017
Excellent Jeremy! This is Benny: http://lego.wikia.com/wiki/Benny_(The_LEGO_Movie)
 I like it 
  April 6, 2017
Fun, creative, educational and even academic; all descriptors that have been used before to describe Lego. Beautiful? Not so much. Until now. Your top under dark light is just that. Beautiful.
 I like it 
  April 6, 2017
That's an amazingly long time. The black light does look awesome. Excellent engineering!
 I made it 
  April 6, 2017
Quoting Gabor Pauler Impressive!
Thank you, Gabor!
 I made it 
  April 6, 2017
Quoting Nils O. Very cool, a new record! Congratulations! :-))
Thanks, Nils!
 I like it 
  April 6, 2017
Impressive!
 I like it 
  April 6, 2017
Very cool, a new record! Congratulations! :-))
 I like it 
  April 6, 2017
That would be awesome but I live in Germany so I'm very very far away from you my friend. But love the US, espeacially Chicago & NYC. Was last year the first time in the US and really hope that I'm able to come back again. But it's expensive. I really appreciate your invitation my friend. Will keep it in mind! PS: Save your email in my address book. You'll get a mail very soon so that you have my contact too.
 I made it 
  April 6, 2017
Quoting Sven ;o) You're welcome my friend :) Know that from my own and other creations with light effects. It's fascinating. I wish I could see your stuff in real life, but don't think that I'm able to visit a US Lego show.
Somehow I thought you live in New York, but sounds like you're overseas. If you're ever in Denver, Colorado, I hope you'll look me up. My email address is "mocpages@cliffshade.com".
 I like it 
  April 6, 2017
You're welcome my friend :) Know that from my own and other creations with light effects. It's fascinating. I wish I could see your stuff in real life, but don't think that I'm able to visit a US Lego show.
 I made it 
  April 6, 2017
Quoting Sven ;o) They look so good under the blacklight. Awesome work my friend!
Thanks, Sven! Blacklights and tops seem to be an entertaining combination. At LEGO shows, I now set up a dark "theater" (black portable dog crate) with blacklights inside. When I spin my fluorescent tops in there, I hear lots of wows and oohs and aahs from the crowd. Very gratifying.
 I like it 
  April 6, 2017
They look so good under the blacklight. Awesome work my friend!
 
By Jeremy McCreary
Add to my favorite builders

17
people like this. See who.

1,528 visitors
34 comments
Added April 6, 2017
 


LEGO models my own creation MOCpages toys shop Spinjitzu burger tops


You Your home page | LEGO creations | Favorite builders
Activity Activity | Comments | Creations
Explore Explore | Recent | Groups
MOCpages is an unofficial, fan-created website. LEGO® and the brick configuration are property of The LEGO Group, which does not sponsor, own, or endorse this site.
©2002-2018 Sean Kenney Design Inc | Privacy policy | Terms of use