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Not Your Mother's (NYM's) Unimog II
Hey All, Back again with another rendition of Not Your Mother’s (NYM’s) Unimog, or…. NYM’s Unimog II (if you scroll through my page you will see the first version). This is not a simple modification of the first version, but really….a whole new beast altogether. Let’s go through all the changes….. First, as I mentioned in my post of the first version, the gearing for this model was still too high although massive gearing had already taken place. Simply put, it still went too fast. Although speed is certainly an attribute, for this model it really wasn’t. It is too big and heavy for high speeds. You can see it all in the video of the first version. When I gave it all she had….. axles never twisted and gears never sheared, but they would pop out of place or connection. So…according to Sariel’s gear calculator, this beast was geared down further to an ungodly and completely inefficient 35:1. Yup, you heard that correctly. 35:1. Check it out: (don't forget the differentials.... they are not included)
About this creation








This was the first big change which necessitated redoing: the whole driveline. Plug the above pictures into the calculator and you get 35:1. Therefore, although it is unknown how fast the motor will be running at full power, [I am assuming 1500 rpms. The specs of the engine (Alex’s, LPEpower.com) state that the max speed for this engine is 1900 rpms, but I don’t run it at full power. So, let’s say the max rpms are 1500. Alex considers 6 or higher bar full power, but I never run my LPE over 4 bar. Also, the runs in the videos are under load, which likely slow things down a bit] that means the final gear, under 4 bar of air pressure is running at like 45 rpms. Slooowwwww… right? But that does not matter. It means the vehicle has ridiculous amounts of torque. The engine is running at a relatively high rpm, but the final output is slow. The idea that I had for the model is posted above. Versatile and completely all-terrain. This is the idea I had for the model when I created it.




Pretty pleased with how things turned out. Runs very similar to the video above.



Finally, although not originally planned to be a puller, because of the awesome torque in the model, it turns out to pull pretty well.



I especially focused on the muddin’ all-terrain nature of the ‘Mog. Although they can certainly rock-climb, they are not true crawlers. Their strength, among others, lies in being able to go through wet, muddy, marshy conditions. That was the fun of doing this build (like NYM’s Unimog I) with a pneumatic engine versus a PF motor. I could submerge it without worrying about getting electronics wet! It truly is water proof (to an extent. I did keep the battery box for the steering motor, but both were mounted high enough to keep out of the water. They did not get harmed in the pics or video. I did take out the winch motor; which was present in NYM’s Unimog I, it sat too low and I couldn’t find space for it to sit high without having it awkwardly stick out). I may be wrong, but I think this is a first for LEGO Technic builders. I have seen many vehicles driven with an LPE, but no crawler/trial trucks or machine of that ilk. Additionally, I haven’t really ever seen a true muddin’ LEGO Technic vehicle. There are some trial trucks and Tatras out there that have gone through a little mud, but nothing extreme. Not a problem if I am missing something…. but it may be a true first and hopefully the beginning of a trend!

Also, in redoing the driveline, increasing the torque and reducing speed, the clutch was no longer necessary. The thing is so slow that when it stops there is not enough inertia to harm anything. So I removed the clutch to add room for the additional gearing.

The second huge change was the tires…… now these things are FOR REAL. I am sure someone will prove me wrong, which is fine with me… but these may be the largest third party tires used with LEGO Technic. I have not seen larger tires used with LEGO. They may appear overkill…. But (1), overkill is cool in this application, and (2) a quick search on youtube and you will see that it is not. There are many ‘mogs with tires such as these. I know there are other LEGO “wheels” that are larger, like making a wheel out of Technic links like in Nico71’s loom:



But technically this is not a tire (it’s a rim). Nor a third-party tire at that. I have posted the size differences between the Unimog tires and the beasts you see on this new model elsewhere, but here they are again.





… here is a picture of the hubs. I could not use regular hubs because these are 2.2 RC tires, not the 1.9 tires usually used by Technic builders using third-party tires on their builds.



Here are the foam inserts for the tires. As can be seen, once filled with water, these things can become super heavy.



Getting to the numbers, the new tires are roughly 40% larger in height and width than the Unimog tires and MUCH heavier. Roughly 157 times heavier! 68 grams to 175. And this is when they are all dry! That is around 700 grams of nothing but tire and rim. That’s a lot of weight for the motor to move. Those reading this are probably well-aware, heavier tires mean more work that needs to go into moving them. Here is the kicker though….. this is when the tires are DRY. These are RC tires, and the rims used are well…..I already explained this. There is not a perfect seal and therefore water got into the tires. Those in the know understand that there are foam inserts in the tires, at these babies soak up tons of water! So… in the video that you see above, when I am muddin’ around, the tires fill up to water and weigh an astounding 100 grams more wet…each. That’s 275 grams per tire. That’s 1100 grams for just tires. So, in the videos keep in mind there is mud, 1100 grams of tires, and not to mention the water to battle against. All told, the NYM’s Unimog II is a pretty tough beast.



I also added a snorkel and additional body work for looks. Check out the pics below.























Thanks for looking! Believe it or not no LEGO gears were injured in the making of this video. If you don’t believe me, I don’t blame you, I hardly believe it myself. - yet, it is true!!






Comments

 I made it 
  April 5, 2017
I think I only lost one or two. But now they are all back. I think your theory is right!!
Quoting Clayton Marchetti Do you know how many you lost?
 I like it 
  April 4, 2017
Do you know how many you lost?
 I like it 
  April 4, 2017
Ok it recorded that one.
 I like it 
  April 4, 2017
That's weird, it didn't even record my like.
 I like it 
  April 4, 2017
I do love Unimogs! That's really awesome!
 I like it 
  October 1, 2015
Nice machine! The tires are awesome. Sometimes I like the pure Lego builds, but time by time, when I see some third party mods, gives to the sets a bright new dimension... And these tires give to the outlook of MB huge improvements! Very inspirative for me too.
 I like it 
  September 9, 2015
This would make a pretty good technique set. A pretty fun toy you got there.
 I like it 
  May 30, 2015
ravishingly beautiful!
 I like it 
  May 26, 2015
Agree with the last post. Awesome muddin! Those tires are also huge.... you may be right, biggest I have ever seen on a Technic model.
 I like it 
  May 25, 2015
This is really cool. I like that you made it able to go through so much water. As for the winch, Maybe you could add a pto shaft to the pneumatic motor for it? I have to agree with you on the tires, overkill=awesome
 I like it 
  April 17, 2015
That tires dude,i love them.<333
  March 7, 2015
You should add motor-driven propellers (maybe connected to the engine via driveshaft or chain) that could help to propel it even faster when in water! That would be awesome!
 I made it 
  March 6, 2015
Quoting Jeremy McCreary Just keeps getting better, Nerds. Boy, when you say "muddin'", you aren't kidding! Was hoping to see it in action, but I see that the embedded videos still aren't working. Why MOCpages can't get its act together with a feature as important as video embedding is beyond me.
I know right? Sorry that you cannot see the video. But the main video should be working now. Also, I have posted this on eurobricks under the technic forum with working vids. If all else fails, here is the website. Not trying to over-promote.... its just pictures really don't do the 'mog justice. You gotta see it run. https://www.youtube.com/watch?v=228alFQy_h4
 I like it 
  March 4, 2015
Just keeps getting better, Nerds. Boy, when you say "muddin'", you aren't kidding! Was hoping to see it in action, but I see that the embedded videos still aren't working. Why MOCpages can't get its act together with a feature as important as video embedding is beyond me.
 I made it 
  March 4, 2015
Quoting jds 7777 WOW! That's awesome! How do you steer it?
Sorry for the two versions. It can be a little confusing. But it is all discussed if you read everything. Anyways, I have a medium motor built into the cab and the battery box which is covered by the canvas. Both high enough that they are not in danger of water damage. As long as I don't go under like 9 or 10 inches of water.
 I like it 
  March 4, 2015
WOW! That's awesome! How do you steer it?
 I made it 
  March 3, 2015
Quoting Nick Barrett Wow. You're really pushing what Lego can do here. Awesome work.
THanks Nick. That is really what I was going for. Trial trucks have been around forever. I could spend a whole write-up here on this topic, but essentially I think that pneumatic engines open a whole new world b/c they can be mounted high (so can motors but no one does) and wont get ruined in water. so much more on this topic but let this suffice for now :)
 I made it 
  March 3, 2015
Quoting Joost Cumps just wow!. results and performance with a pneumatic motor are just incredible!. Where is pressure coming from? Lego electric motors?
No. Just browse my pages and you will see a little inventing going on. http://mocpages.com/moc.php/393479 Nothing more than Coke bottles, glue, and a bike pump. I have an air compressor but this is much more fun.
 I like it 
  March 3, 2015
just wow!. results and performance with a pneumatic motor are just incredible!. Where is pressure coming from? Lego electric motors?
 I like it 
  March 3, 2015
Wow. You're really pushing what Lego can do here. Awesome work.
 I like it 
  March 3, 2015
Freaking awesome!
 I like it 
  March 3, 2015
For me, this video is not available because it legal reasons may not be shown in Germany because of the music. But the Unimog is very good.
 I made it 
  March 2, 2015
Sorry ya'all. I don't know why the videos won't load. I have emailed the help desk. If anyone knows.... feel free to message me. I have done it in the past with success. But it will currently not allow iframes.
 
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