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Ford SVT Raptor
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Another attempt at a large scale truck, containing a unique and completely synchronized 4-speed transmission, motorized rear differential lock, and several other functions.
About this creation
Propulsion: 2 x XL Motors
Steering: 1 x M Motor
Drive Type: 4WD-RWD
Transmission: 4-speed sequential and completely synchronized with 1 x L Motor
Weight: 2.6 kg.
Height: 18 cm high
Length: 59 cm long
Width: 23 cm wide
Power Source: 7.2v AA Eneloop Batteries
Extra Motorized Functions: 4WD-RWD selector with 1 x M Motor
Rear differential lock with 1 x M Motor
Estimated part count: 2600 peices


This is my third attempt at a large-scale truck, built to explore several new mechanical systems and a new transmission. I just had no idea how difficult it would be to actually complete the project. The version shown here is actually the fifth chassis I built, the previous ones having failed for a whole hoard of reasons.

The new transmission used here is unique in that it is completely synchronized, sequential, and yet still controlled by just a single motor. It is built off of the principle of two separate 2-speed transmissions, one containing ratios of 1:1 and 2.78:1, the other containing ratios of 1:1 and 1.67:1. By making one transmission’s output the other’s input and switching through them in a specific manner, you end up with the following ratios:
Gear 1; 4.63:1
2; 2.78:1
3; 1.67:1
4; 1:1

Because the transmission utilized two different 2-speed transmissions, each one being engaged into a gear at all times, the transmission was completely synchronized and had no need for a clutch and no tendency to “jam” as most other multi-speed motorized transmissions do. It worked flawlessly when controlled by an L Motor at a 24:1 worm gear reduction, the L Motor only having been used because I ran out of M Motors. I will (probably, unless I forget…) post pictures and instructions for it soon.

The drivetrain was fairly straightforward, similar to my other vehicles with the drive from two motors - in this case XL motors geared down 1.67:1 - being fed through the transmission before traveling on to the axles. The front axle, connected to a V8 under the hood, had a 4WD - RWD selector controlled by an M motor and 24t clutch gear and the rear axle had something I have never used before: a differential lock. This too was controlled by an M motor, and to reduce axle width I incorporated it into the post-differential reduction. This was a relatively easy system to implement and worked fine.

The post-differential reduction I mentioned above was formed of my wish for an independent suspension containing a gear reduction to reduce stress on the differential. I briefly attempted Sariel-inspired independent portal axles as in my Hummer , but they were too unstable and would cause the steered wheels to bend outwards. To achieve the reduction without portal axles, I used a 1.67:1 reduction just after the differential that gained me 2 studs ground clearance as well as less stress on the differential and drivetrain.

To achieve better stability on the front axle, I used the steering wheel hubs from set 42029 for the first time. They were less likely to bend and twist due to the mounting points having 3 studs between them, but they allowed the wheels to wobble back-and-forth far more than the suspension parts from the 8070 set.

The model was slower than I intended, but considering the weight, size and 2 XL motors for drive (some large Technic trucks use 4 or more) I don’t think I would have been able to make it go much faster. It was mechanically sound in all areas and the highly experimental transmission worked well. It was also my first vehicle to actually look like the subject it was modeled after, and so I would in the end call it a success. The transmission has given me an idea; and so keep watch for my next large-scale car model as I have something rather special planned…

Since the page won't let me embed the video, here's the link: Ford SVT Raptor Video


































































Comments

 I like it 
  July 5, 2015
just fab would be a good LEGO set but would probably be to expensive
 I like it 
  July 5, 2015
Excellent design, Love the size and body work!
 I like it 
  July 5, 2015
Superb!
Rage  Hobbit
 I like it 
Cars Lover
  April 21, 2015
Incredible work, the bodywork is very well done,and the technicle features are awesome too. My favourite area is the front design, all in all great work ;), the only thing that could be change would be the roof, it could be a bit higher but thats my opinion :) Keep it up ;)
 I made it 
  April 3, 2015
Quoting Francisco Hartley Man, I just came across this MOc again....it is AWESOME !!!! Is there a video ??? Would love to see it working ;)
Thank you so much! There is a video (https://www.youtube.com/watch?v=xQtRo1FM_58) but the page wouldn't let me embed it.
 I like it 
  April 1, 2015
Amazing! Congrats! 5/5
 I like it 
  April 1, 2015
Man, I just came across this MOc again....it is AWESOME !!!! Is there a video ??? Would love to see it working ;)
 I like it 
  March 16, 2015
Some brilliant solutions here; I'd be first in line for a peek at that gearbox! Very nice work indeed.
 I made it 
  March 13, 2015
Quoting K. R. Cool Model! I like the amount of features you managed to put into the chassis. I would like to understand better how your gearbox works. Could you share a few details?
Thanks! The gearbox worked well enough that I will be posting pictures and instructions for it within two weeks or so (or whenever I get it out of the truck... maybe sooner).
 I like it 
  March 13, 2015
Cool Model! I like the amount of features you managed to put into the chassis. I would like to understand better how your gearbox works. Could you share a few details?
 I like it 
  March 12, 2015
NICE !!!!
 I like it 
  March 12, 2015
Great work!
 I like it 
  March 11, 2015
Wow, huge thing! Very good work!
 I like it 
  March 11, 2015
An engineering masterpiece. I am totally amazed by your incredible work. I could never even begin to build something like this. Bravo on a job very well done. 10/10
 I made it 
  March 11, 2015
Quoting Nils O. Wow, that's awesome, a real Technic supercar! It really has everything a supercar needs! Just one suggestion: Have you thought about a Lego built grill, maybe something like this? -> http://www.mocpages.com/image_zoom.php?mocid=376393&id=/user_images/80625/14260911981 Anyway, great job! :-))
Thanks, that grille is pretty awesome and I would love to incorporate it into my model. Unfortunately, my collection is relatively limited (~3600 parts) and I am unable to build it.
 I like it 
  March 11, 2015
Wow, this is an awesome technik Raptor. Love every detail and it's instantly recognizable! The grill which Nils is showing you would be a great addition ;)
 I like it 
  March 11, 2015
Wow, that's awesome, a real Technic supercar! It really has everything a supercar needs! Just one suggestion: Have you thought about a Lego built grill, maybe something like this? -> http://www.mocpages.com/image_zoom.php?mocid=376393&id=/user_images/80625/14260911981 Anyway, great job! :-))
 I made it 
  March 11, 2015
Quoting Firas Abu-Jaber Absolute beauty! I already thought about building my own version but you beat me to it. Lovely work here, I like how this model mixes between Technic and System at the same time, which made this an instant recognised vehicle , not to mention the usual complicated Technic work. Easily A+
Thank you very much! Sorry for stealing your idea :)
 I like it 
  March 11, 2015
Absolute beauty! I already thought about building my own version but you beat me to it. Lovely work here, I like how this model mixes between Technic and System at the same time, which made this an instant recognised vehicle , not to mention the usual complicated Technic work. Easily A+
 I made it 
  March 11, 2015
Quoting Per Bonde Very impressed. I love everything and I envy everybody being able to construct a working gearbox/transmission. Will never be able to build anything like this. Contrats on a fantastic build!
I think you perhaps misconstrue the Technic world; coming up with a new transmission is not easy! I actually have instructions for one of my 4-speeds posted here: http://www.mocpages.com/moc.php/400943 And I will be posting instructions for the one shown here shortly. Hope this helps.
 I like it 
  March 11, 2015
Very impressed. I love everything and I envy everybody being able to construct a working gearbox/transmission. Will never be able to build anything like this. Contrats on a fantastic build!
 I like it 
  March 11, 2015
This is truely incredible! The ground-clearance could possibly be improved, as well as the roof. But otherwise, great work!
 I like it 
  March 10, 2015
Nice Looking Truck...!
 I like it 
  March 10, 2015
This, this I like. Very realistic the only thing (and it may be photo angle) is that roof seems a bit low. But this, this I like.
 I made it 
  March 10, 2015
Quoting Mister Hashtag Really cool truck! I think it would be even better if it had higher ground clearance, but it has so many awesome functions that it doesn't matter :D
Thanks. I actually tried several other suspension systems (several of which yielded higher clearance) but they all resulted in worse performance than the independent in this final version. Actually, the ground clearance would be higher, but the weight of the truck is flattening my springs... :)
 I made it 
  March 10, 2015
Quoting Alexander Paschoaletto What an animal - huge truck with amazing shaping abd brilliant techniches - lovely work!
Thank you! I've been keeping an eye on your most recent models, they're all excellent as well.
 I like it 
  March 10, 2015
Really cool truck! I think it would be even better if it had higher ground clearance, but it has so many awesome functions that it doesn't matter :D
 I like it 
  March 10, 2015
What an animal - huge truck with amazing shaping abd brilliant techniches - lovely work!
 I like it 
  March 10, 2015
I usually don't like Technic cars, but this is very impressive. -Nathanael
 I made it 
  March 10, 2015
Quoting All
Thanks a lot everyone!
 I like it 
  March 10, 2015
Uhhhhh...I cant find my jaw....oh yea it is on the FLOOR....
 I like it 
  March 10, 2015
WOW! Just awesome truck! Absolutely your the best MOC! Looks very realistic. Great work! Keep it up!
 I made it 
  March 10, 2015
Quoting Turbo Charger Holy moly! What a great SVT model! Superb looking. You could have made the front Ford sign out of real bricks, it would look nicer.
Thanks a lot! Actually, I initially did try to make the Ford sign on the front by using bricks as you now suggest, however; most of my system bricks are 8+ years old and as such I don't have many plates in the "dark stone grey" color the sign would require.
 I like it 
  March 10, 2015
Holy moly! What a great SVT model! Superb looking. You could have made the front Ford sign out of real bricks, it would look nicer.
 I like it 
  March 10, 2015
Great work!
 I like it 
  March 10, 2015
Awesome in every way! I especially like the engineerin! Well done & keep building!
 
By Rage Hobbit
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