Jump to content


The Reaper 4 x 4

lego technic the reaper 4x4 4 x 4 NXT rock crawler

  • Please log in to reply
44 replies to this topic

#1 Doc_Brown

Doc_Brown

    Posts: 1408
    Joined: 14-February 13
    Member: 39782
    Country: Australia

Posted 22 May 2013 - 11:35 AM

Hello everyone! :grin:

I'm proud to show my latest MOC...

:devil:   THE REAPER   :devil:

Posted Image

This model is based on Tim Cameron's "Showtime" and other similar Rock crawlers.

Posted ImagePosted Image

Posted ImagePosted Image

Posted ImagePosted Image



The chassis utilizes NXT motors geared down 3:1, and one servo for steering the front wheels only. The NXT motors are connected using adapters that allow connection to regular PF elements.

This project started out as a "quick" experiment that soon got out of hand!!!
I enjoyed trying out ways of joining liftarms and seeing what shapes I could get out of them.

Things that I'm not too happy with are the shortness of the model, and now that I have found some better pics of Showtime I can see it should be 3-4 studs longer, and lower too.
The seats were far more leaned back, but due to the rear motor needing more clearance I had to pull them forward making the cab a bit cramped. LOL



As for performance, I was amazed, The Reaper will easily go up 45 degree plank of wood, that is quite smooth with no major tweaks.
Turning isn't the best, but that is to be expected with no diffs; and I tried to tune it to a nice balance of turning and NON wheel tearing. :tongue:
This crawler has no gear grinding at all, and I am very happy with the new type 2 8t. :thumbup: :thumbup: :thumbup: also I rigged the PF lights to the steering so it kind of flashes when steered!
Edit: The shocks were made from combining Unimog and old bike sets, just to keep it black.

Weight is 1.320 KG.

After I have made a video (prob next week, Wed)  I will reuse and tweak this awesome chassis, and hopefully make something a little lower. :grin:

Please feel free to comment, and ask any question's. If you would like a particular pic please ask soonish as I have the lights set up hahaha.

Thanks for looking. :laugh:

Edited by Doc_Brown, 23 May 2013 - 10:19 AM.

You're just not thinking fourth dimensionally!

Flickr http://www.flickr.co...s/93348708@N05/
YouTube https://www.youtube....yaKing01/videos

#2 Junpei

Junpei

    Posts: 1080
    Joined: 26-April 13
    Member: 50045
    Country: U.S.A

Posted 22 May 2013 - 11:47 AM

Wow that is amazing!  But where is the nxt unit?

#3 Doc_Brown

Doc_Brown

    Posts: 1408
    Joined: 14-February 13
    Member: 39782
    Country: Australia

Posted 22 May 2013 - 11:51 AM

View PostTwentyLeggedHen, on 22 May 2013 - 11:47 AM, said:

Wow that is amazing!  But where is the nxt unit?

:sweet: There are adapters for the NXT motors to fit to more regular PF connections. Dang should have mentioned that. Thanks!
You're just not thinking fourth dimensionally!

Flickr http://www.flickr.co...s/93348708@N05/
YouTube https://www.youtube....yaKing01/videos

#4 piterx

piterx

    Posts: 1463
    Joined: 15-June 12
    Member: 29201
    Country: Italy

Posted 22 May 2013 - 11:52 AM

one word man: BADASS

now stop playing with legos and shoot a video :laugh:
Posted Image

#5 Doc_Brown

Doc_Brown

    Posts: 1408
    Joined: 14-February 13
    Member: 39782
    Country: Australia

Posted 22 May 2013 - 12:02 PM

View Postpiterx, on 22 May 2013 - 11:52 AM, said:

one word man: BADASS

now stop playing with legos and shoot a video :laugh:

HAHAHA, Thanks mate!
I know I want to make a video baddd, but the cool rocks are far away....
You're just not thinking fourth dimensionally!

Flickr http://www.flickr.co...s/93348708@N05/
YouTube https://www.youtube....yaKing01/videos

#6 piterx

piterx

    Posts: 1463
    Joined: 15-June 12
    Member: 29201
    Country: Italy

Posted 22 May 2013 - 12:04 PM

well, just order them online !!! :grin:
Posted Image

#7 Doc_Brown

Doc_Brown

    Posts: 1408
    Joined: 14-February 13
    Member: 39782
    Country: Australia

Posted 22 May 2013 - 12:21 PM

View Postpiterx, on 22 May 2013 - 12:04 PM, said:

well, just order them online !!! :grin:

LOL, I wish, but you just gave me an awesome idea! I will build a test track from chipboard with hills and stuff, and put some cheap sandpaper over it as grip. :grin:
You're just not thinking fourth dimensionally!

Flickr http://www.flickr.co...s/93348708@N05/
YouTube https://www.youtube....yaKing01/videos

#8 Hopey

Hopey

    Posts: 209
    Joined: 22-June 12
    Member: 29336
    Country: Australia

Posted 22 May 2013 - 12:35 PM

Cool. It appears you have the hard springs from 8110 / 9398, but on black shocks, not yellow. Are these available like that or did you assemble them yourself?

#9 piterx

piterx

    Posts: 1463
    Joined: 15-June 12
    Member: 29201
    Country: Italy

Posted 22 May 2013 - 12:47 PM

those are old shock absorbers from some bikes :)
Posted Image

#10 Doc_Brown

Doc_Brown

    Posts: 1408
    Joined: 14-February 13
    Member: 39782
    Country: Australia

Posted 22 May 2013 - 12:59 PM

View PostHopey, on 22 May 2013 - 12:35 PM, said:

Cool. It appears you have the hard springs from 8110 / 9398, but on black shocks, not yellow. Are these available like that or did you assemble them yourself?

Thanks, I assembled them myself. From different shocks, the black ends from some old bike sets. :grin:

Posted ImagePosted Image
You're just not thinking fourth dimensionally!

Flickr http://www.flickr.co...s/93348708@N05/
YouTube https://www.youtube....yaKing01/videos

#11 Zblj

Zblj

    Posts: 5619
    Joined: 16-August 09
    Member: 7054
    Country: Slovenia

Posted 22 May 2013 - 02:16 PM

Looks really good and thanks to those NXT motors you only ahve few gears. One thing, maybe you could lower suspension a bit, seems rather too hight ATM.

Video please!

#12 OleBM

OleBM

    Posts: 75
    Joined: 02-February 13
    Member: 38674
    Country: Norway

Posted 22 May 2013 - 03:16 PM

Cool! Am I correct when I assume that you could actually (to a certain deegree) "meet and climb" a vertical object with the front?
And are those the rims used on the unimog? If so, I would love to know where I can order some of those tyres! They look awesome

#13 Doc_Brown

Doc_Brown

    Posts: 1408
    Joined: 14-February 13
    Member: 39782
    Country: Australia

Posted 22 May 2013 - 03:47 PM

View PostZblj, on 22 May 2013 - 02:16 PM, said:

Looks really good and thanks to those NXT motors you only ahve few gears. One thing, maybe you could lower suspension a bit, seems rather too hight ATM.

Video please!

I will Zblj tomorrow! And thanks too.

View PostOleBM, on 22 May 2013 - 03:16 PM, said:

Cool! Am I correct when I assume that you could actually (to a certain deegree) "meet and climb" a vertical object with the front?
And are those the rims used on the unimog? If so, I would love to know where I can order some of those tyres! They look awesome

Thanks, I just looked, and unfortunately it wont, cos of half a stud! When I lower it tomorrow, hopefully it will. :grin:
Yes they are the unimog rims, and I will find a link to those tires, I paid around $5 AUS which is pretty good!
You're just not thinking fourth dimensionally!

Flickr http://www.flickr.co...s/93348708@N05/
YouTube https://www.youtube....yaKing01/videos

#14 GDomino

GDomino

    Posts: 48
    Joined: 17-February 12
    Member: 26587
    Country: US

Posted 22 May 2013 - 05:00 PM

Looks Good Doc! Looks like a rock bouncer... I am anticipating the video also and want to see the performance. I might have to try something like this since I do have a few of those NXT motors laying around. Just never got into messing  with the NXT when I got the set as a present a few years ago. Now I have a reason to salvage it.

#15 dikkie klijn

dikkie klijn

    Posts: 217
    Joined: 15-April 11
    Member: 17271
    Country: Netherlands

Posted 22 May 2013 - 09:23 PM

Nice build!

#16 timslegos

timslegos

    Posts: 2285
    Joined: 14-July 11
    Member: 19027
    Country: United States

Posted 22 May 2013 - 09:40 PM

You should know by now there is no such thing as a "small project" :wink: .  The truck looks great though, especially in black.  I am really looking forward to the video.

tim

#17 Someonenamedjon

Someonenamedjon

    Posts: 659
    Joined: 14-February 13
    Member: 39757
    Country: USA

Posted 22 May 2013 - 11:24 PM

View PostDoc_Brown, on 22 May 2013 - 12:02 PM, said:

HAHAHA, Thanks mate!
I know I want to make a video baddd, but the cool rocks are far away....

Just go outside and put it on a bad soccer field! :grin:

Great job though!
-Jon

#18 Doc_Brown

Doc_Brown

    Posts: 1408
    Joined: 14-February 13
    Member: 39782
    Country: Australia

Posted 23 May 2013 - 02:02 AM

Should have a short video up in about 4 hours times. Thanks for all the nice comments! :sweet:
You're just not thinking fourth dimensionally!

Flickr http://www.flickr.co...s/93348708@N05/
YouTube https://www.youtube....yaKing01/videos

#19 Someonenamedjon

Someonenamedjon

    Posts: 659
    Joined: 14-February 13
    Member: 39757
    Country: USA

Posted 23 May 2013 - 02:18 AM

View PostDoctor Charlie Brown, on 20 November 2286 - 06:46 PM, said:

Should have a short video up in about 4 hours times. Thanks for all the nice comments! :sweet:
I can't wait to see it tomorrow then! Thanks Doctor!
-Jon

#20 Doc_Brown

Doc_Brown

    Posts: 1408
    Joined: 14-February 13
    Member: 39782
    Country: Australia

Posted 23 May 2013 - 09:31 AM

View PostSomeonenamedjon, on 23 May 2013 - 02:18 AM, said:

I can't wait to see it tomorrow then! Thanks Doctor!

Cheers!
Here is the test video.


I had a lot of fun testing and it held up extremely well. I estimated the best angle it managed was about 51 degrees. I think it can do better with a more gripper surface.

Please sign in and Rate, Comment and Subscribe! I spent most of the day making this video, LOL. :tongue:
You're just not thinking fourth dimensionally!

Flickr http://www.flickr.co...s/93348708@N05/
YouTube https://www.youtube....yaKing01/videos

#21 piterx

piterx

    Posts: 1463
    Joined: 15-June 12
    Member: 29201
    Country: Italy

Posted 23 May 2013 - 09:46 AM

O.O
never seen anything like that....one of the most powerful crawlers i've ever seen
congratulatins dude!
Posted Image

#22 Doc_Brown

Doc_Brown

    Posts: 1408
    Joined: 14-February 13
    Member: 39782
    Country: Australia

Posted 23 May 2013 - 10:26 AM

View Postpiterx, on 23 May 2013 - 09:46 AM, said:

O.O
never seen anything like that....one of the most powerful crawlers i've ever seen
congratulatins dude!

Cheers!!! :grin:

Here are some more pics, I have lowered the suspension by 1.5 studs and changed the top frame. Also made the front steering brace much smaller.
Posted ImagePosted Image



View PostOleBM, on 22 May 2013 - 03:16 PM, said:

Cool! Am I correct when I assume that you could actually (to a certain deegree) "meet and climb" a vertical object with the front?
And are those the rims used on the unimog? If so, I would love to know where I can order some of those tyres! They look awesome

It will now "meet and climb" a vertical object, as you will see in the video. :sweet:

Edited by Doc_Brown, 23 May 2013 - 10:27 AM.

You're just not thinking fourth dimensionally!

Flickr http://www.flickr.co...s/93348708@N05/
YouTube https://www.youtube....yaKing01/videos

#23 timslegos

timslegos

    Posts: 2285
    Joined: 14-July 11
    Member: 19027
    Country: United States

Posted 23 May 2013 - 12:13 PM

Nice performance in the video.  I was hoping the motors would be faster though.

tim

#24 750ACE

750ACE

  • Brutally Self Aware


    Posts: 436
    Joined: 20-November 12
    Member: 33162
    Country: USA

Posted 23 May 2013 - 12:16 PM

Pretty sweet.  I bought the same tires a few months ago and am happy with the grip, rock crusher XT 1.9.  Glad you took the shock housings apart, the black looks good.

#25 OleBM

OleBM

    Posts: 75
    Joined: 02-February 13
    Member: 38674
    Country: Norway

Posted 23 May 2013 - 02:52 PM

The performance looks awesome. Few trucks/cars would manage what you accomplished with yours, especially when climbing that board. I thought it was going to tip backwards for sure, but the weight distribution in this car is obviously perfect :wink:





Also tagged with one or more of these keywords: lego technic, the reaper, 4x4, 4 x 4, NXT, rock crawler

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users