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Bat Tumbler
My fully functional Bat Tumbler. 44cm long, 27cm wide, 1.9Kg. 8 cylinder engine, full suspension, steering, PF opening canopy and lights.
About this creation

(Built early 2010, now dismantled)

Some views...









I wanted to build a tumbler a) because the steering is a challenge, b) because I wanted to build something big that used my big wheels, c) because the Tumbler's cool.

I had some large wheels from the old F1 set which proved perfect for the front wheels, and in proportion to the back wheels. They are also very wide giving a large space within the wheel which can contain much of the steering mechanism required. I built around 4 or 5 different front wheel steering mechanisms before finalising it. Wasn't perfect. There was a lot of slack in the final set up but it did work.
The biggest problem was ensuring the front arms were sufficiently rigid. The large wheels created a large force at the end of the arms so I needed to create heavily reinforced "L" shaped structures which helped ensure the front arms didn't flex.





I used the floating suspension I had developed on the Land Rover to enable an authentic independent suspension with differential gear in the confined width available between the back wheels. Worked very nicely.





PF lights at the top (I had just dismantled the Lego Off-Roader that had the lights).
And the cabin opens up with power functions. Looked really cool in motion, the pictures don't really capture it.



The look was a little messy but I was generally happy with it. I attempted to follow the actual facets on the real car. You can judge for yourselves how close I got. The grey panels didn't help, but I didn't have black at the time.
For such a large model it was satisfyingly robust, if a little heavy (I think I tend to use too much structural Lego).


Some pictures of the steering mechanism (as requested) built in LDD. I think it's fairly accurate. It's based on some photo's of the semi-dismantled Tumbler. Note that the wheel I used was from the old F1 car so covered more of the mechanism than the standard rim shown. I haven't shown all the structure required to hold the front arms onto the body. This had to be quite rigid and involved a lot of reinforcing. Note also the comment above that the steering was a little slack in the end.







Building instructions
Download building instructions (LEGO Digital Designer)

Comments

 I made it 
  August 10, 2012
Quoting Terron Pederson is there anyway for you to provide a download link for the steering
Thanks all for the interest. LDD files are now included, hope it all works okay, and you find it interesting/useful. As I've said, it's by no means perfect, so perhaps you can refine and improve it. Good building!
 I made it 
  August 10, 2012
Quoting Nils O. Hi Fogtod, you can just go into the "Edit" mode of this MOC and add the LDD or LDraw file under "Building Instructions". By the way: It's still one of the best Tumblers on MOCpages...
Thanks all for the interest, and for pointing out how easy it is to attach LDD files. They are now included, hope it all works okay, and you find it interesting/useful. As I've said, it's by no means perfect, so perhaps you can refine and improve it. Good building!
  August 8, 2012
Hi Fogtod, you can just go into the "Edit" mode of this MOC and add the LDD or LDraw file under "Building Instructions". By the way: It's still one of the best Tumblers on MOCpages...
 I made it 
  August 8, 2012
Quoting Terron Pederson is there anyway for you to provide a download link for the steering
I'm more than happy to provide any information I can, but I'd need a little help to know how to provide a link. It's not something I've done before.
 I like it 
  July 31, 2012
is there anyway for you to provide a download link for the steering
 I like it 
  March 21, 2012
Fantastic tumbler, awesome functions.
  March 19, 2012
Thanks for the additional pictures! And now that I looked at it one more time it really looks as if you even managed to get an "Ackermann pattern" for the steering. If one day I get to build my own Technic Tumbler there won't be much room for any improvement! - Respect! :-))
 I made it 
  March 18, 2012
Quoting Shaun Blyth can you show more pictures of the steering setup? I'm try to build a bat tumbler myself but having a hard time figuring out the inside out steering design
Hope the pictures cover the bits you were interested in seeing, and hope they help. I'll look forward to seeing your Tumbler!
Fogtod the Engineer
 I like it 
Chris Melby
  March 13, 2012
I think this is one of the best tumblers I've seen, especially on this scale. Very nice.
 I made it 
  March 7, 2012
Quoting Shaun Blyth can you show more pictures of the steering setup? I'm try to build a bat tumbler myself but having a hard time figuring out the inside out steering design
I'll try and hunt out a few pics or create something. Unfortunately it's dismantled now, but I'll do my best in the coming days. Thanks for taking a look! The steering was a little slack but you can take a look at what I did and I'm sure improve on it. I'll be interested in seeing what you come up with.
 I like it 
  February 26, 2012
can you show more pictures of the steering setup? I'm try to build a bat tumbler myself but having a hard time figuring out the inside out steering design
 I made it 
  December 2, 2011
Quoting Nils O. Then I have to ask: Shouldn't it be the other way, I mean the angles of the front wheels? For me it looks like the curve radius of the inner wheel is bigger than the one of the outer wheel. Batman would need his front wheels to be replaced quite often ;-)) But hey, that's such a minor detail having in mind this great Technic model.
No, I think it was right. The outer wheel had a larger turn radius than the inner wheel, as you correctly say it should. Though I didn't spend any time ensuring they were the exactly correct radii. It's dismantled now so I can't check myself. If I build another I'll make absolutely sure. Thanks for taking such a keen detailed interest!
  December 2, 2011
Then I have to ask: Shouldn't it be the other way, I mean the angles of the front wheels? For me it looks like the curve radius of the inner wheel is bigger than the one of the outer wheel. Batman would need his front wheels to be replaceed quite often ;-)) But hey, that's such a minor detail having in mind this great Technic model.
 I made it 
  November 27, 2011
Quoting Nils O. That's a great model. The shaping is cool and the Technic details are great. My favourite detail is the steering. Do you have different angles for each wheel or is that an illusion because of the wide angle photo shot?
Thanks. The front wheels did have different steering angles, due to the geometry of the levers around the hub.
 I like it 
  November 27, 2011
That's a great model. The shaping is cool and the Technic details are great. My favourite detail is the steering. Do you have different angles for each wheel or is that an illusion because of the wide angle photo shot?
 I like it 
  May 9, 2011
Nice one! I couldn't do better! I wish i had that much technic. Looking forward to seeing more work from you.
 I like it 
  May 9, 2011
Some good technical solutions here and it's a cool model - sometimes it's hard to not over-reinforce a structure. Be Colin Chapman; add lightness!
 
By Fogtod the Engineer
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Added May 9, 2011
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