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truck trial attempt one
A first attempt for a truck trial. I'll rebuild this to resolve a few engeneering problems.
About this creation
Special thanks to Roman 89 and Nico 71 on brickshelf, and I think a whole lot of other truck trial builders for their ideas.




Here you see the front axle. very very very strong.
You see the engine is a V10, I started to make a Dodge RAM.


View of the rear axle. Here you see the flexible- leaf spring- problem. They shift a little, and don't go back. Result: chassis is crooked.


Special features: the system for gear change. Makes it very tall though.
The flexible tubes have another feature: there are flexibles mounted in it, result is that they very reistable from tearing apart. the drivng axle still bends, though.








This creation will be rebuild very soon. I have a few problems that - in my opinion - only can be resolved by redoing the whole.
Problem one: axles not wide enough. I had to build in the motors to high, that's not good for stability.
Problem two: the flexibles that I use as leaf springs: not sure if this will last. in the front : ok, but in the rear they tend to shift a little, but not shift back.
Problem three: gearbox. in highest gear chatters from inputline to the gearline, in second gear chatters from gearline to the driveline of the front drive, in lowest gear chatters to the driveline of the rearwheels. Maybe best to rebuild in oldschool technic?



Comments

 I like it 
  May 6, 2012
Great job joost! i love the tube idea! i also love the linear actuator idea! great truck! could you check out mine? 5/5
 I like it 
  November 1, 2011
...a Citroën Méhari is perfect. I cant wait to see, good luck :)
 I like it 
  August 1, 2011
Fine technique there, and it isn't even finished yet!
 I made it 
  August 1, 2011
Quoting Ben Shaw rules http://lowlug.nl/index.php?option=com_content&view=article&id=35:trucktrial-english&catid=19:trucktrial&Itemid=49 but I think they've changed since then, I believe you are only allowed on XL motor per 750 gramms total weight and cool gearbox design by the way
Thank you for this message, I did already find the same page, I also did find an adjustment to the rules for use of PF motors, but the 1 XL PF /750g I wasn't aware. Also glad you like the gearbox, It is much mor effective that the gearbox I used in "attempt one". Disadvantage is that the number of gears, and the use of gearwheels in all dimensions is limited.
 I like it 
  July 31, 2011
rules http://lowlug.nl/index.php?option=com_content&view=article&id=35:trucktrial-english&catid=19:trucktrial&Itemid=49 but I think they've changed since then, I believe you are only allowed on XL motor per 750 gramms total weight and cool gearbox design by the way
 I made it 
  July 13, 2011
Does anybody knows where to find rules for truck trial, or even if they exist? Thanks for any post!!!!
 I like it 
  June 25, 2011
Obviously this is not finished, but it is very impressive. You have good potential for portal axles at the front which you haven't made full use of (but I guess there was a trade-off for strength). For the gearbox, I would recommend old technic. Is it an automatic gearbox? If not, I recommend fitting one. All it takes is a differential in the drive line with power being leached off to the shift-actuator proportional to resistance. Finally, lower your battery box! You have your centre of gravity unnecessarily high! But still, this is a fantastic creation.
 I like it 
  May 30, 2011
Lots of technical stuff:) Never thought of using flexitubes as leaf springs. Shame it didn't work. I am still learning 'new technic' too I have only built one creation but I am planning more. Good luck with the rebuild.
 I like it 
  May 22, 2011
Some great technical solutions here - I like the flexi tubes for leaf springs idea.
 I made it 
  May 21, 2011
Quoting R. H. Very good start, I am currently working on a Trial Truck myself. I gave up on a transmission for mine, so I hope yours works out nicely. It'd be great if those leaf-springs worked, it'd make your truck very unique!
I've had allready a little experience with gears. The Lego one-with synchromesh- I used it in my 2CV. It isn't strong enough for truck trial, they keep on jumping out of gear. The old way is better, but with new technic there is to much space between the bars. The leaf springs are really from Roman 89 He is really doing a good job in his latest project Thanks for the comments, I hope to see your project soon.
 I like it 
  May 21, 2011
Very good start, I am currently working on a Trial Truck myself. I gave up on a transmission for mine, so I hope yours works out nicely. It'd be great if those leaf-springs worked, it'd make your truck very unique!
 I made it 
  May 21, 2011
I've forgot to say : please leave as much comments as you want, I still am looking for inspiration
 
By Joost Cumps
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Added May 21, 2011
 


LEGO models my own creation MOCpages toys shop truck trial attempt oneVehicles


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